third_party/WebKit/WebCore/rendering/RenderBlock.cpp - Issue 21152: WebKit merge 40668:40722 part 1.

Unified Diff: third_party/WebKit/WebCore/rendering/RenderBlock.cpp

Issue 21152: WebKit merge 40668:40722 part 1. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/

Patch Set: Created 11 years, 10 months ago

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Index: third_party/WebKit/WebCore/rendering/RenderBlock.cpp

===================================================================

--- third_party/WebKit/WebCore/rendering/RenderBlock.cpp (revision 9310)

+++ third_party/WebKit/WebCore/rendering/RenderBlock.cpp (working copy)

@@ -1,5018 +1,5018 @@

-/*

- *

- * This library is free software; you can redistribute it and/or

- * modify it under the terms of the GNU Library General Public

- * License as published by the Free Software Foundation; either

- * version 2 of the License, or (at your option) any later version.

- *

- * This library is distributed in the hope that it will be useful,

- * but WITHOUT ANY WARRANTY; without even the implied warranty of

- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

- * Library General Public License for more details.

- *

- * You should have received a copy of the GNU Library General Public License

- * along with this library; see the file COPYING.LIB. If not, write to

- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

- * Boston, MA 02110-1301, USA.

- */

-#include "config.h"

-#include "RenderBlock.h"

-#include "Document.h"

-#include "Element.h"

-#include "FloatQuad.h"

-#include "Frame.h"

-#include "FrameView.h"

-#include "GraphicsContext.h"

-#include "HTMLNames.h"

-#include "HitTestResult.h"

-#include "InlineTextBox.h"

-#include "RenderImage.h"

-#include "RenderInline.h"

-#include "RenderMarquee.h"

-#include "RenderReplica.h"

-#include "RenderTableCell.h"

-#include "RenderTextFragment.h"

-#include "RenderTheme.h"

-#include "RenderView.h"

-#include "SelectionController.h"

-#include <wtf/StdLibExtras.h>

-using namespace std;

-using namespace WTF;

-using namespace Unicode;

-namespace WebCore {

-// Number of pixels to allow as a fudge factor when clicking above or below a line.

-// clicking up to verticalLineClickFudgeFactor pixels above a line will correspond to the closest point on the line.

-const int verticalLineClickFudgeFactor= 3;

-using namespace HTMLNames;

-static void moveChild(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* from, RenderObjectChildList* fromChildList, RenderObject* child)

- ASSERT(from == child->parent());

- toChildList->appendChildNode(to, fromChildList->removeChildNode(from, child, false), false);

-struct ColumnInfo {

- ColumnInfo()

- : m_desiredColumnWidth(0)

- , m_desiredColumnCount(1)

- { }

- int m_desiredColumnWidth;

- unsigned m_desiredColumnCount;

- Vector<IntRect> m_columnRects;

-};

-typedef WTF::HashMap<const RenderBox*, ColumnInfo*> ColumnInfoMap;

-static ColumnInfoMap* gColumnInfoMap = 0;

-typedef WTF::HashMap<const RenderBlock*, HashSet<RenderBox*>*> PercentHeightDescendantsMap;

-static PercentHeightDescendantsMap* gPercentHeightDescendantsMap = 0;

-typedef WTF::HashMap<const RenderBox*, HashSet<RenderBlock*>*> PercentHeightContainerMap;

-static PercentHeightContainerMap* gPercentHeightContainerMap = 0;

-typedef WTF::HashMap<RenderBlock*, ListHashSet<RenderInline*>*> ContinuationOutlineTableMap;

-// Our MarginInfo state used when laying out block children.

-RenderBlock::MarginInfo::MarginInfo(RenderBlock* block, int top, int bottom)

- // Whether or not we can collapse our own margins with our children. We don't do this

- // if we had any border/padding (obviously), if we're the root or HTML elements, or if

- // we're positioned, floating, a table cell.

- m_canCollapseWithChildren = !block->isRenderView() && !block->isRoot() && !block->isPositioned() &&

- !block->isFloating() && !block->isTableCell() && !block->hasOverflowClip() && !block->isInlineBlockOrInlineTable();

- m_canCollapseTopWithChildren = m_canCollapseWithChildren && (top == 0) && block->style()->marginTopCollapse() != MSEPARATE;

- // If any height other than auto is specified in CSS, then we don't collapse our bottom

- // margins with our children's margins. To do otherwise would be to risk odd visual

- // effects when the children overflow out of the parent block and yet still collapse

- // with it. We also don't collapse if we have any bottom border/padding.

- m_canCollapseBottomWithChildren = m_canCollapseWithChildren && (bottom == 0) &&

- (block->style()->height().isAuto() && block->style()->height().value() == 0) && block->style()->marginBottomCollapse() != MSEPARATE;

- m_quirkContainer = block->isTableCell() || block->isBody() || block->style()->marginTopCollapse() == MDISCARD ||

- block->style()->marginBottomCollapse() == MDISCARD;

- m_atTopOfBlock = true;

- m_atBottomOfBlock = false;

- m_posMargin = m_canCollapseTopWithChildren ? block->maxTopMargin(true) : 0;

- m_negMargin = m_canCollapseTopWithChildren ? block->maxTopMargin(false) : 0;

- m_selfCollapsingBlockClearedFloat = false;

- m_topQuirk = m_bottomQuirk = m_determinedTopQuirk = false;

-// -------------------------------------------------------------------------------------------------------

-RenderBlock::RenderBlock(Node* node)

- : RenderBox(node)

- , m_floatingObjects(0)

- , m_positionedObjects(0)

- , m_inlineContinuation(0)

- , m_maxMargin(0)

- , m_overflowHeight(0)

- , m_overflowWidth(0)

- , m_overflowLeft(0)

- , m_overflowTop(0)

- , m_lineHeight(-1)

- setChildrenInline(true);

-RenderBlock::~RenderBlock()

- delete m_floatingObjects;

- delete m_positionedObjects;

- delete m_maxMargin;

- if (hasColumns())

- delete gColumnInfoMap->take(this);

- if (gPercentHeightDescendantsMap) {

- if (HashSet<RenderBox*>* descendantSet = gPercentHeightDescendantsMap->take(this)) {

- HashSet<RenderBox*>::iterator end = descendantSet->end();

- for (HashSet<RenderBox*>::iterator descendant = descendantSet->begin(); descendant != end; ++descendant) {

- HashSet<RenderBlock*>* containerSet = gPercentHeightContainerMap->get(*descendant);

- ASSERT(containerSet);

- if (!containerSet)

- continue;

- ASSERT(containerSet->contains(this));

- containerSet->remove(this);

- if (containerSet->isEmpty()) {

- gPercentHeightContainerMap->remove(*descendant);

- delete containerSet;

- }

- delete descendantSet;

- }

-void RenderBlock::destroy()

- // Detach our continuation first.

- if (m_inlineContinuation)

- m_inlineContinuation->destroy();

- m_inlineContinuation = 0;

- // Make sure to destroy anonymous children first while they are still connected to the rest of the tree, so that they will

- // properly dirty line boxes that they are removed from. Effects that do :before/:after only on hover could crash otherwise.

- children()->destroyLeftoverChildren();

- if (!documentBeingDestroyed()) {

- if (firstLineBox()) {

- // We can't wait for RenderBox::destroy to clear the selection,

- // because by then we will have nuked the line boxes.

- // FIXME: The SelectionController should be responsible for this when it

- // is notified of DOM mutations.

- if (isSelectionBorder())

- view()->clearSelection();

- // If we are an anonymous block, then our line boxes might have children

- // that will outlast this block. In the non-anonymous block case those

- // children will be destroyed by the time we return from this function.

- if (isAnonymousBlock()) {

- for (InlineFlowBox* box = firstLineBox(); box; box = box->nextFlowBox()) {

- while (InlineBox* childBox = box->firstChild())

- childBox->remove();

- }

- } else if (isInline() && parent())

- parent()->dirtyLinesFromChangedChild(this);

- }

- m_lineBoxes.deleteLineBoxes(renderArena());

- RenderBox::destroy();

-void RenderBlock::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)

- setReplaced(newStyle->isDisplayReplacedType());

- if (style() && parent() && diff == StyleDifferenceLayout && style()->position() != newStyle->position()) {

- if (newStyle->position() == StaticPosition)

- // Clear our positioned objects list. Our absolutely positioned descendants will be

- // inserted into our containing block's positioned objects list during layout.

- removePositionedObjects(0);

- else if (style()->position() == StaticPosition) {

- // Remove our absolutely positioned descendants from their current containing block.

- // They will be inserted into our positioned objects list during layout.

- RenderObject* cb = parent();

- while (cb && (cb->style()->position() == StaticPosition || (cb->isInline() && !cb->isReplaced())) && !cb->isRenderView()) {

- if (cb->style()->position() == RelativePosition && cb->isInline() && !cb->isReplaced()) {

- cb = cb->containingBlock();

- break;

- }

- cb = cb->parent();

- }

- if (cb->isRenderBlock())

- toRenderBlock(cb)->removePositionedObjects(this);

- }

- RenderBox::styleWillChange(diff, newStyle);

-void RenderBlock::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)

- RenderBox::styleDidChange(diff, oldStyle);

- // FIXME: We could save this call when the change only affected non-inherited properties

- for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {

- if (child->isAnonymousBlock()) {

- RefPtr<RenderStyle> newStyle = RenderStyle::create();

- newStyle->inheritFrom(style());

- newStyle->setDisplay(BLOCK);

- child->setStyle(newStyle.release());

- }

- m_lineHeight = -1;

- // Update pseudos for :before and :after now.

- if (!isAnonymous() && document()->usesBeforeAfterRules() && canHaveChildren()) {

- updateBeforeAfterContent(BEFORE);

- updateBeforeAfterContent(AFTER);

- }

- updateFirstLetter();

-void RenderBlock::updateBeforeAfterContent(PseudoId pseudoId)

- // If this is an anonymous wrapper, then the parent applies its own pseudo-element style to it.

- if (parent() && parent()->createsAnonymousWrapper())

- return;

- return children()->updateBeforeAfterContent(this, pseudoId);

-void RenderBlock::addChild(RenderObject* newChild, RenderObject* beforeChild)

- // Make sure we don't append things after :after-generated content if we have it.

- if (!beforeChild && isAfterContent(lastChild()))

- beforeChild = lastChild();

- bool madeBoxesNonInline = false;

- // If the requested beforeChild is not one of our children, then this is because

- // there is an anonymous container within this object that contains the beforeChild.

- if (beforeChild && beforeChild->parent() != this) {

- RenderObject* anonymousChild = beforeChild->parent();

- ASSERT(anonymousChild);

- while (anonymousChild->parent() != this)

- anonymousChild = anonymousChild->parent();

- ASSERT(anonymousChild->isAnonymous());

- if (anonymousChild->isAnonymousBlock()) {

- // Insert the child into the anonymous block box instead of here.

- if (newChild->isInline() || beforeChild->parent()->firstChild() != beforeChild)

- beforeChild->parent()->addChild(newChild, beforeChild);

- else

- addChild(newChild, beforeChild->parent());

- return;

- }

- ASSERT(anonymousChild->isTable());

- if (newChild->isTableCol() && newChild->style()->display() == TABLE_COLUMN_GROUP

- || newChild->isRenderBlock() && newChild->style()->display() == TABLE_CAPTION

- || newChild->isTableSection()

- || newChild->isTableRow()

- || newChild->isTableCell()) {

- // Insert into the anonymous table.

- anonymousChild->addChild(newChild, beforeChild);

- return;

- }

- // Go on to insert before the anonymous table.

- beforeChild = anonymousChild;

- }

- // A block has to either have all of its children inline, or all of its children as blocks.

- // So, if our children are currently inline and a block child has to be inserted, we move all our

- // inline children into anonymous block boxes.

- if (childrenInline() && !newChild->isInline() && !newChild->isFloatingOrPositioned()) {

- // This is a block with inline content. Wrap the inline content in anonymous blocks.

- makeChildrenNonInline(beforeChild);

- madeBoxesNonInline = true;

- if (beforeChild && beforeChild->parent() != this) {

- beforeChild = beforeChild->parent();

- ASSERT(beforeChild->isAnonymousBlock());

- ASSERT(beforeChild->parent() == this);

- }

- } else if (!childrenInline() && (newChild->isFloatingOrPositioned() || newChild->isInline())) {

- // If we're inserting an inline child but all of our children are blocks, then we have to make sure

- // it is put into an anomyous block box. We try to use an existing anonymous box if possible, otherwise

- // a new one is created and inserted into our list of children in the appropriate position.

- RenderObject* afterChild = beforeChild ? beforeChild->previousSibling() : lastChild();

- if (afterChild && afterChild->isAnonymousBlock()) {

- afterChild->addChild(newChild);

- return;

- }

- if (newChild->isInline()) {

- // No suitable existing anonymous box - create a new one.

- RenderBlock* newBox = createAnonymousBlock();

- RenderBox::addChild(newBox, beforeChild);

- newBox->addChild(newChild);

- return;

- }

- RenderBox::addChild(newChild, beforeChild);

- if (madeBoxesNonInline && parent() && isAnonymousBlock() && parent()->isRenderBlock())

- toRenderBlock(parent())->removeLeftoverAnonymousBlock(this);

- // this object may be dead here

-static void getInlineRun(RenderObject* start, RenderObject* boundary,

- RenderObject*& inlineRunStart,

- RenderObject*& inlineRunEnd)

- // Beginning at |start| we find the largest contiguous run of inlines that

- // we can. We denote the run with start and end points, |inlineRunStart|

- // and |inlineRunEnd|. Note that these two values may be the same if

- // we encounter only one inline.

- //

- // We skip any non-inlines we encounter as long as we haven't found any

- // inlines yet.

- //

- // |boundary| indicates a non-inclusive boundary point. Regardless of whether |boundary|

- // is inline or not, we will not include it in a run with inlines before it. It's as though we encountered

- // a non-inline.

- // Start by skipping as many non-inlines as we can.

- RenderObject * curr = start;

- bool sawInline;

- do {

- while (curr && !(curr->isInline() || curr->isFloatingOrPositioned()))

- curr = curr->nextSibling();

- inlineRunStart = inlineRunEnd = curr;

- if (!curr)

- return; // No more inline children to be found.

- sawInline = curr->isInline();

- curr = curr->nextSibling();

- while (curr && (curr->isInline() || curr->isFloatingOrPositioned()) && (curr != boundary)) {

- inlineRunEnd = curr;

- if (curr->isInline())

- sawInline = true;

- curr = curr->nextSibling();

- }

- } while (!sawInline);

-void RenderBlock::deleteLineBoxTree()

- m_lineBoxes.deleteLineBoxTree(renderArena());

-void RenderBlock::dirtyLineBoxes(bool fullLayout, bool isRootLineBox)

- if (!isRootLineBox && isReplaced())

- return RenderBox::dirtyLineBoxes(fullLayout, isRootLineBox);

- if (fullLayout)

- m_lineBoxes.deleteLineBoxes(renderArena());

- else

- m_lineBoxes.dirtyLineBoxes();

-InlineBox* RenderBlock::createInlineBox(bool makePlaceHolderBox, bool isRootLineBox, bool /*isOnlyRun*/)

- if (!isRootLineBox && (isReplaced() || makePlaceHolderBox)) // Inline tables and inline blocks

- return RenderBox::createInlineBox(false, isRootLineBox); // (or positioned element placeholders).

- InlineFlowBox* flowBox = new (renderArena()) RootInlineBox(this);

- m_lineBoxes.appendLineBox(flowBox);

- return flowBox;

-void RenderBlock::makeChildrenNonInline(RenderObject *insertionPoint)

- // makeChildrenNonInline takes a block whose children are *all* inline and it

- // makes sure that inline children are coalesced under anonymous

- // blocks. If |insertionPoint| is defined, then it represents the insertion point for

- // the new block child that is causing us to have to wrap all the inlines. This

- // means that we cannot coalesce inlines before |insertionPoint| with inlines following

- // |insertionPoint|, because the new child is going to be inserted in between the inlines,

- // splitting them.

- ASSERT(isInlineBlockOrInlineTable() || !isInline());

- ASSERT(!insertionPoint || insertionPoint->parent() == this);

- setChildrenInline(false);

- RenderObject *child = firstChild();

- if (!child)

- return;

- deleteLineBoxTree();

- while (child) {

- RenderObject *inlineRunStart, *inlineRunEnd;

- getInlineRun(child, insertionPoint, inlineRunStart, inlineRunEnd);

- if (!inlineRunStart)

- break;

- child = inlineRunEnd->nextSibling();

- RenderBlock* block = createAnonymousBlock();

- children()->insertChildNode(this, block, inlineRunStart);

- RenderObject* o = inlineRunStart;

- while (o != inlineRunEnd) {

- RenderObject* no = o;

- o = no->nextSibling();

- moveChild(block, block->children(), this, children(), no);

- }

- moveChild(block, block->children(), this, children(), inlineRunEnd);

- }

-#ifndef NDEBUG

- for (RenderObject *c = firstChild(); c; c = c->nextSibling())

- ASSERT(!c->isInline());

-#endif

- repaint();

-void RenderBlock::removeLeftoverAnonymousBlock(RenderBlock* child)

- ASSERT(child->isAnonymousBlock());

- ASSERT(!child->childrenInline());

- if (child->inlineContinuation())

- return;

- RenderObject* firstAnChild = child->m_children.firstChild();

- RenderObject* lastAnChild = child->m_children.lastChild();

- if (firstAnChild) {

- RenderObject* o = firstAnChild;

- while (o) {

- o->setParent(this);

- o = o->nextSibling();

- }

- firstAnChild->setPreviousSibling(child->previousSibling());

- lastAnChild->setNextSibling(child->nextSibling());

- if (child->previousSibling())

- child->previousSibling()->setNextSibling(firstAnChild);

- if (child->nextSibling())

- child->nextSibling()->setPreviousSibling(lastAnChild);

- } else {

- if (child->previousSibling())

- child->previousSibling()->setNextSibling(child->nextSibling());

- if (child->nextSibling())

- child->nextSibling()->setPreviousSibling(child->previousSibling());

- }

- if (child == m_children.firstChild())

- m_children.setFirstChild(firstAnChild);

- if (child == m_children.lastChild())

- m_children.setLastChild(lastAnChild);

- child->setParent(0);

- child->setPreviousSibling(0);

- child->setNextSibling(0);

- child->children()->setFirstChild(0);

- child->m_next = 0;

- child->destroy();

-void RenderBlock::removeChild(RenderObject* oldChild)

- // If this child is a block, and if our previous and next siblings are

- // both anonymous blocks with inline content, then we can go ahead and

- // fold the inline content back together.

- RenderObject* prev = oldChild->previousSibling();

- RenderObject* next = oldChild->nextSibling();

- bool canDeleteAnonymousBlocks = !documentBeingDestroyed() && !isInline() && !oldChild->isInline() &&

- (!oldChild->isRenderBlock() || !toRenderBlock(oldChild)->inlineContinuation()) &&

- (!prev || (prev->isAnonymousBlock() && prev->childrenInline())) &&

- (!next || (next->isAnonymousBlock() && next->childrenInline()));

- if (canDeleteAnonymousBlocks && prev && next) {

- // Take all the children out of the |next| block and put them in

- // the |prev| block.

- prev->setNeedsLayoutAndPrefWidthsRecalc();

- RenderObject* o = next->firstChild();

- RenderBlock* nextBlock = toRenderBlock(next);

- RenderBlock* prevBlock = toRenderBlock(prev);

- while (o) {

- RenderObject* no = o;

- o = no->nextSibling();

- moveChild(prevBlock, prevBlock->children(), nextBlock, nextBlock->children(), no);

- }

- nextBlock->deleteLineBoxTree();

- // Nuke the now-empty block.

- next->destroy();

- }

- RenderBox::removeChild(oldChild);

- RenderObject* child = prev ? prev : next;

- if (canDeleteAnonymousBlocks && child && !child->previousSibling() && !child->nextSibling() && !isFlexibleBox()) {

- // The removal has knocked us down to containing only a single anonymous

- // box. We can go ahead and pull the content right back up into our

- // box.

- setNeedsLayoutAndPrefWidthsRecalc();

- RenderBlock* anonBlock = toRenderBlock(children()->removeChildNode(this, child, false));

- setChildrenInline(true);

- RenderObject* o = anonBlock->firstChild();

- while (o) {

- RenderObject* no = o;

- o = no->nextSibling();

- moveChild(this, children(), anonBlock, anonBlock->children(), no);

- }

- // Delete the now-empty block's lines and nuke it.

- anonBlock->deleteLineBoxTree();

- anonBlock->destroy();

- }

-int RenderBlock::overflowHeight(bool includeInterior) const

- if (!includeInterior && hasOverflowClip()) {

- int shadowHeight = 0;

- for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next)

- shadowHeight = max(boxShadow->y + boxShadow->blur, shadowHeight);

- int inflatedHeight = height() + shadowHeight;

- if (hasReflection())

- inflatedHeight = max(inflatedHeight, reflectionBox().bottom());

- return inflatedHeight;

- }

- return m_overflowHeight;

-int RenderBlock::overflowWidth(bool includeInterior) const

- if (!includeInterior && hasOverflowClip()) {

- int shadowWidth = 0;

- for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next)

- shadowWidth = max(boxShadow->x + boxShadow->blur, shadowWidth);

- int inflatedWidth = width() + shadowWidth;

- if (hasReflection())

- inflatedWidth = max(inflatedWidth, reflectionBox().right());

- return inflatedWidth;

- }

- return m_overflowWidth;

-int RenderBlock::overflowLeft(bool includeInterior) const

- if (!includeInterior && hasOverflowClip()) {

- int shadowLeft = 0;

- for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next)

- shadowLeft = min(boxShadow->x - boxShadow->blur, shadowLeft);

- int left = shadowLeft;

- if (hasReflection())

- left = min(left, reflectionBox().x());

- return left;

- }

- return m_overflowLeft;

-int RenderBlock::overflowTop(bool includeInterior) const

- if (!includeInterior && hasOverflowClip()) {

- int shadowTop = 0;

- for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next)

- shadowTop = min(boxShadow->y - boxShadow->blur, shadowTop);

- int top = shadowTop;

- if (hasReflection())

- top = min(top, reflectionBox().y());

- return top;

- }

- return m_overflowTop;

-IntRect RenderBlock::overflowRect(bool includeInterior) const

- if (!includeInterior && hasOverflowClip()) {

- IntRect box = borderBoxRect();

- int shadowLeft = 0;

- int shadowRight = 0;

- int shadowTop = 0;

- int shadowBottom = 0;

- for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) {

- shadowLeft = min(boxShadow->x - boxShadow->blur, shadowLeft);

- shadowRight = max(boxShadow->x + boxShadow->blur, shadowRight);

- shadowTop = min(boxShadow->y - boxShadow->blur, shadowTop);

- shadowBottom = max(boxShadow->y + boxShadow->blur, shadowBottom);

- }

- box.move(shadowLeft, shadowTop);

- box.setWidth(box.width() - shadowLeft + shadowRight);

- box.setHeight(box.height() - shadowTop + shadowBottom);

- if (hasReflection()) {

- IntRect reflection(reflectionBox());

- int reflectTop = min(box.y(), reflection.y());

- int reflectBottom = max(box.bottom(), reflection.bottom());

- box.setHeight(reflectBottom - reflectTop);

- box.setY(reflectTop);

- int reflectLeft = min(box.x(), reflection.x());

- int reflectRight = max(box.right(), reflection.right());

- box.setWidth(reflectRight - reflectLeft);

- box.setX(reflectLeft);

- }

- return box;

- }

- if (!includeInterior && hasOverflowClip())

- return borderBoxRect();

- int l = overflowLeft(includeInterior);

- int t = overflowTop(includeInterior);

- return IntRect(l, t, overflowWidth(includeInterior) - l, max(overflowHeight(includeInterior), height()) - t);

-bool RenderBlock::isSelfCollapsingBlock() const

- // We are not self-collapsing if we

- // (a) have a non-zero height according to layout (an optimization to avoid wasting time)

- // (b) are a table,

- // (c) have border/padding,

- // (d) have a min-height

- // (e) have specified that one of our margins can't collapse using a CSS extension

- if (height() > 0 ||

- isTable() || (borderBottom() + paddingBottom() + borderTop() + paddingTop()) != 0 ||

- style()->minHeight().isPositive() ||

- style()->marginTopCollapse() == MSEPARATE || style()->marginBottomCollapse() == MSEPARATE)

- return false;

- bool hasAutoHeight = style()->height().isAuto();

- if (style()->height().isPercent() && !style()->htmlHacks()) {

- hasAutoHeight = true;

- for (RenderBlock* cb = containingBlock(); !cb->isRenderView(); cb = cb->containingBlock()) {

- if (cb->style()->height().isFixed() || cb->isTableCell())

- hasAutoHeight = false;

- }

- // If the height is 0 or auto, then whether or not we are a self-collapsing block depends

- // on whether we have content that is all self-collapsing or not.

- if (hasAutoHeight || ((style()->height().isFixed() || style()->height().isPercent()) && style()->height().isZero())) {

- // If the block has inline children, see if we generated any line boxes. If we have any

- // line boxes, then we can't be self-collapsing, since we have content.

- if (childrenInline())

- return !firstLineBox();

- // Whether or not we collapse is dependent on whether all our normal flow children

- // are also self-collapsing.

- for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {

- if (child->isFloatingOrPositioned())

- continue;

- if (!child->isSelfCollapsingBlock())

- return false;

- }

- return true;

- }

- return false;

-void RenderBlock::layout()

- // Update our first letter info now.

- updateFirstLetter();

- // Table cells call layoutBlock directly, so don't add any logic here. Put code into

- // layoutBlock().

- layoutBlock(false);

- // It's safe to check for control clip here, since controls can never be table cells.

- if (hasControlClip()) {

- // Because of the lightweight clip, there can never be any overflow from children.

- m_overflowWidth = width();

- m_overflowHeight = height();

- m_overflowLeft = 0;

- m_overflowTop = 0;

- }

-void RenderBlock::layoutBlock(bool relayoutChildren)

- ASSERT(needsLayout());

- if (isInline() && !isInlineBlockOrInlineTable()) // Inline <form>s inside various table elements can

- return; // cause us to come in here. Just bail.

- if (!relayoutChildren && layoutOnlyPositionedObjects())

- return;

- LayoutRepainter repainter(*this, m_everHadLayout && checkForRepaintDuringLayout());

- LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), hasColumns() || hasTransform() || hasReflection());

- int oldWidth = width();

- int oldColumnWidth = desiredColumnWidth();

- calcWidth();

- calcColumnWidth();

- m_overflowWidth = width();

- m_overflowLeft = 0;

- if (oldWidth != width() || oldColumnWidth != desiredColumnWidth())

- relayoutChildren = true;

- clearFloats();

- int previousHeight = height();

- setHeight(0);

- m_overflowHeight = 0;

- // We use four values, maxTopPos, maxPosNeg, maxBottomPos, and maxBottomNeg, to track

- // our current maximal positive and negative margins. These values are used when we

- // are collapsed with adjacent blocks, so for example, if you have block A and B

- // collapsing together, then you'd take the maximal positive margin from both A and B

- // and subtract it from the maximal negative margin from both A and B to get the

- // true collapsed margin. This algorithm is recursive, so when we finish layout()

- // our block knows its current maximal positive/negative values.

- //

- // Start out by setting our margin values to our current margins. Table cells have

- // no margins, so we don't fill in the values for table cells.

- bool isCell = isTableCell();

- if (!isCell) {

- initMaxMarginValues();

- setTopMarginQuirk(style()->marginTop().quirk());

- setBottomMarginQuirk(style()->marginBottom().quirk());

- Node* node = element();

- if (node && node->hasTagName(formTag) && static_cast<HTMLFormElement*>(node)->isMalformed()) {

- // See if this form is malformed (i.e., unclosed). If so, don't give the form

- // a bottom margin.

- setMaxBottomMargins(0, 0);

- }

- // For overflow:scroll blocks, ensure we have both scrollbars in place always.

- if (scrollsOverflow()) {

- if (style()->overflowX() == OSCROLL)

- m_layer->setHasHorizontalScrollbar(true);

- if (style()->overflowY() == OSCROLL)

- m_layer->setHasVerticalScrollbar(true);

- }

- int repaintTop = 0;

- int repaintBottom = 0;

- int maxFloatBottom = 0;

- if (childrenInline())

- layoutInlineChildren(relayoutChildren, repaintTop, repaintBottom);

- else

- layoutBlockChildren(relayoutChildren, maxFloatBottom);

- // Expand our intrinsic height to encompass floats.

- int toAdd = borderBottom() + paddingBottom() + horizontalScrollbarHeight();

- if (floatBottom() > (height() - toAdd) && expandsToEncloseOverhangingFloats())

- setHeight(floatBottom() + toAdd);

- // Now lay out our columns within this intrinsic height, since they can slightly affect the intrinsic height as

- // we adjust for clean column breaks.

- int singleColumnBottom = layoutColumns();

- // Calculate our new height.

- int oldHeight = height();

- calcHeight();

- if (oldHeight != height()) {

- if (oldHeight > height() && maxFloatBottom > height() && !childrenInline()) {

- // One of our children's floats may have become an overhanging float for us. We need to look for it.

- for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {

- if (child->isBlockFlow() && !child->isFloatingOrPositioned()) {

- RenderBlock* block = toRenderBlock(child);

- if (block->floatBottom() + block->y() > height())

- addOverhangingFloats(block, -block->x(), -block->y(), false);

- }

- // We have to rebalance columns to the new height.

- layoutColumns(singleColumnBottom);

- // If the block got expanded in size, then increase our overflowheight to match.

- if (m_overflowHeight > height())

- m_overflowHeight -= toAdd;

- if (m_overflowHeight < height())

- m_overflowHeight = height();

- }

- if (previousHeight != height())

- relayoutChildren = true;

- if ((isCell || isInline() || isFloatingOrPositioned() || isRoot()) && !hasOverflowClip() && !hasControlClip())

- addVisualOverflow(floatRect());

- layoutPositionedObjects(relayoutChildren || isRoot());

- positionListMarker();

- // Always ensure our overflow width/height are at least as large as our width/height.

- m_overflowWidth = max(m_overflowWidth, width());

- m_overflowHeight = max(m_overflowHeight, height());

- if (!hasOverflowClip()) {

- for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) {

- m_overflowLeft = min(m_overflowLeft, boxShadow->x - boxShadow->blur);

- m_overflowWidth = max(m_overflowWidth, width() + boxShadow->x + boxShadow->blur);

- m_overflowTop = min(m_overflowTop, boxShadow->y - boxShadow->blur);

- m_overflowHeight = max(m_overflowHeight, height() + boxShadow->y + boxShadow->blur);

- }

- if (hasReflection()) {

- m_overflowTop = min(m_overflowTop, reflectionBox().y());

- m_overflowHeight = max(m_overflowHeight, reflectionBox().bottom());

- }

- statePusher.pop();

- // Update our scroll information if we're overflow:auto/scroll/hidden now that we know if

- // we overflow or not.

- if (hasOverflowClip())

- m_layer->updateScrollInfoAfterLayout();

- // Repaint with our new bounds if they are different from our old bounds.

- bool didFullRepaint = repainter.repaintAfterLayout();

- if (!didFullRepaint && repaintTop != repaintBottom && (style()->visibility() == VISIBLE || enclosingLayer()->hasVisibleContent())) {

- IntRect repaintRect(m_overflowLeft, repaintTop, m_overflowWidth - m_overflowLeft, repaintBottom - repaintTop);

- // FIXME: Deal with multiple column repainting. We have to split the repaint

- // rect up into multiple rects if it spans columns.

- repaintRect.inflate(maximalOutlineSize(PaintPhaseOutline));

- if (hasOverflowClip()) {

- // Adjust repaint rect for scroll offset

- int x = repaintRect.x();

- int y = repaintRect.y();

- layer()->subtractScrolledContentOffset(x, y);

- repaintRect.setX(x);

- repaintRect.setY(y);

- // Don't allow this rect to spill out of our overflow box.

- repaintRect.intersect(IntRect(0, 0, width(), height()));

- }

- // Make sure the rect is still non-empty after intersecting for overflow above

- if (!repaintRect.isEmpty()) {

- repaintRectangle(repaintRect); // We need to do a partial repaint of our content.

- if (hasReflection())

- layer()->reflection()->repaintRectangle(repaintRect);

- }

- setNeedsLayout(false);

-bool RenderBlock::expandsToEncloseOverhangingFloats() const

- return isInlineBlockOrInlineTable() || isFloatingOrPositioned() || hasOverflowClip() || (parent() && parent()->isFlexibleBox()) || hasColumns() || isTableCell() || isFieldset();

-void RenderBlock::adjustPositionedBlock(RenderBox* child, const MarginInfo& marginInfo)

- if (child->hasStaticX()) {

- if (style()->direction() == LTR)

- child->setStaticX(borderLeft() + paddingLeft());

- else

- child->setStaticX(borderRight() + paddingRight());

- }

- if (child->hasStaticY()) {

- int y = height();

- if (!marginInfo.canCollapseWithTop()) {

- child->calcVerticalMargins();

- int marginTop = child->marginTop();

- int collapsedTopPos = marginInfo.posMargin();

- int collapsedTopNeg = marginInfo.negMargin();

- if (marginTop > 0) {

- if (marginTop > collapsedTopPos)

- collapsedTopPos = marginTop;

- } else {

- if (-marginTop > collapsedTopNeg)

- collapsedTopNeg = -marginTop;

- }

- y += (collapsedTopPos - collapsedTopNeg) - marginTop;

- }

- child->setStaticY(y);

- }

-void RenderBlock::adjustFloatingBlock(const MarginInfo& marginInfo)

- // The float should be positioned taking into account the bottom margin

- // of the previous flow. We add that margin into the height, get the

- // float positioned properly, and then subtract the margin out of the

- // height again. In the case of self-collapsing blocks, we always just

- // use the top margins, since the self-collapsing block collapsed its

- // own bottom margin into its top margin.

- //

- // Note also that the previous flow may collapse its margin into the top of

- // our block. If this is the case, then we do not add the margin in to our

- // height when computing the position of the float. This condition can be tested

- // for by simply calling canCollapseWithTop. See

- // http://www.hixie.ch/tests/adhoc/css/box/block/margin-collapse/046.html for

- // an example of this scenario.

- int marginOffset = marginInfo.canCollapseWithTop() ? 0 : marginInfo.margin();

- setHeight(height() + marginOffset);

- positionNewFloats();

- setHeight(height() - marginOffset);

-RenderBox* RenderBlock::handleSpecialChild(RenderBox* child, const MarginInfo& marginInfo, bool& handled)

- // Handle positioned children first.

- RenderBox* next = handlePositionedChild(child, marginInfo, handled);

- if (handled) return next;

- // Handle floating children next.

- next = handleFloatingChild(child, marginInfo, handled);

- if (handled) return next;

- // Finally, see if we have a run-in element.

- return handleRunInChild(child, handled);

-RenderBox* RenderBlock::handlePositionedChild(RenderBox* child, const MarginInfo& marginInfo, bool& handled)

- if (child->isPositioned()) {

- handled = true;

- child->containingBlock()->insertPositionedObject(child);

- adjustPositionedBlock(child, marginInfo);

- return child->nextSiblingBox();

- }

- return 0;

-RenderBox* RenderBlock::handleFloatingChild(RenderBox* child, const MarginInfo& marginInfo, bool& handled)

- if (child->isFloating()) {

- handled = true;

- insertFloatingObject(child);

- adjustFloatingBlock(marginInfo);

- return child->nextSiblingBox();

- }

- return 0;

-RenderBox* RenderBlock::handleRunInChild(RenderBox* child, bool& handled)

- // See if we have a run-in element with inline children. If the

- // children aren't inline, then just treat the run-in as a normal

- // block.

- if (child->isRunIn() && (child->childrenInline() || child->isReplaced())) {

- RenderBlock* blockRunIn = toRenderBlock(child);

- // Get the next non-positioned/non-floating RenderBlock.

- RenderObject* curr = blockRunIn->nextSibling();

- while (curr && curr->isFloatingOrPositioned())

- curr = curr->nextSibling();

- if (curr && (curr->isRenderBlock() && curr->childrenInline() && !curr->isRunIn())) {

- RenderBlock* currBlock = toRenderBlock(curr);

- // The block acts like an inline, so just null out its

- // position.

- handled = true;

- // Remove the old child.

- RenderBox* next = blockRunIn->nextSiblingBox();

- children()->removeChildNode(this, blockRunIn);

- // Create an inline.

- RenderInline* inlineRunIn = new (renderArena()) RenderInline(blockRunIn->node());

- inlineRunIn->setStyle(blockRunIn->style());

- // Move the nodes from the old child to the new child.

- for (RenderObject* runInChild = blockRunIn->firstChild(); runInChild; runInChild = runInChild->nextSibling())

- moveChild(inlineRunIn, inlineRunIn->children(), blockRunIn, blockRunIn->children(), runInChild);

- // Now insert the new child under |currBlock|.

- currBlock->children()->insertChildNode(currBlock, inlineRunIn, currBlock->firstChild());

- // If the run-in had an element, we need to set the new renderer.

- if (blockRunIn->element())

- blockRunIn->element()->setRenderer(inlineRunIn);

- // Destroy the block run-in.

- blockRunIn->destroy();

- return next;

- }

- return 0;

-void RenderBlock::collapseMargins(RenderBox* child, MarginInfo& marginInfo, int yPosEstimate)

- // Get our max pos and neg top margins.

- int posTop = child->maxTopMargin(true);

- int negTop = child->maxTopMargin(false);

- // For self-collapsing blocks, collapse our bottom margins into our

- // top to get new posTop and negTop values.

- if (child->isSelfCollapsingBlock()) {

- posTop = max(posTop, child->maxBottomMargin(true));

- negTop = max(negTop, child->maxBottomMargin(false));

- }

- // See if the top margin is quirky. We only care if this child has

- // margins that will collapse with us.

- bool topQuirk = child->isTopMarginQuirk() || style()->marginTopCollapse() == MDISCARD;

- if (marginInfo.canCollapseWithTop()) {

- // This child is collapsing with the top of the

- // block. If it has larger margin values, then we need to update

- // our own maximal values.

- if (!style()->htmlHacks() || !marginInfo.quirkContainer() || !topQuirk)

- setMaxTopMargins(max(posTop, maxTopPosMargin()), max(negTop, maxTopNegMargin()));

- // The minute any of the margins involved isn't a quirk, don't

- // collapse it away, even if the margin is smaller (www.webreference.com

- // has an example of this, a <dt> with 0.8em author-specified inside

- // a <dl> inside a <td>.

- if (!marginInfo.determinedTopQuirk() && !topQuirk && (posTop-negTop)) {

- setTopMarginQuirk(false);

- marginInfo.setDeterminedTopQuirk(true);

- }

- if (!marginInfo.determinedTopQuirk() && topQuirk && marginTop() == 0)

- // We have no top margin and our top child has a quirky margin.

- // We will pick up this quirky margin and pass it through.

- // This deals with the <td><div><p> case.

- // Don't do this for a block that split two inlines though. You do

- // still apply margins in this case.

- setTopMarginQuirk(true);

- }

- if (marginInfo.quirkContainer() && marginInfo.atTopOfBlock() && (posTop - negTop))

- marginInfo.setTopQuirk(topQuirk);

- int ypos = height();

- if (child->isSelfCollapsingBlock()) {

- // This child has no height. We need to compute our

- // position before we collapse the child's margins together,

- // so that we can get an accurate position for the zero-height block.

- int collapsedTopPos = max(marginInfo.posMargin(), child->maxTopMargin(true));

- int collapsedTopNeg = max(marginInfo.negMargin(), child->maxTopMargin(false));

- marginInfo.setMargin(collapsedTopPos, collapsedTopNeg);

- // Now collapse the child's margins together, which means examining our

- // bottom margin values as well.

- marginInfo.setPosMarginIfLarger(child->maxBottomMargin(true));

- marginInfo.setNegMarginIfLarger(child->maxBottomMargin(false));

- if (!marginInfo.canCollapseWithTop())

- // We need to make sure that the position of the self-collapsing block

- // is correct, since it could have overflowing content

- // that needs to be positioned correctly (e.g., a block that

- // had a specified height of 0 but that actually had subcontent).

- ypos = height() + collapsedTopPos - collapsedTopNeg;

- }

- else {

- if (child->style()->marginTopCollapse() == MSEPARATE) {

- setHeight(height() + marginInfo.margin() + child->marginTop());

- ypos = height();

- }

- else if (!marginInfo.atTopOfBlock() ||

- (!marginInfo.canCollapseTopWithChildren()

- && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.topQuirk()))) {

- // We're collapsing with a previous sibling's margins and not

- // with the top of the block.

- setHeight(height() + max(marginInfo.posMargin(), posTop) - max(marginInfo.negMargin(), negTop));

- ypos = height();

- }

- marginInfo.setPosMargin(child->maxBottomMargin(true));

- marginInfo.setNegMargin(child->maxBottomMargin(false));

- if (marginInfo.margin())

- marginInfo.setBottomQuirk(child->isBottomMarginQuirk() || style()->marginBottomCollapse() == MDISCARD);

- marginInfo.setSelfCollapsingBlockClearedFloat(false);

- }

- view()->addLayoutDelta(IntSize(0, yPosEstimate - ypos));

- child->setLocation(child->x(), ypos);

- if (ypos != yPosEstimate) {

- if (child->shrinkToAvoidFloats())

- // The child's width depends on the line width.

- // When the child shifts to clear an item, its width can

- // change (because it has more available line width).

- // So go ahead and mark the item as dirty.

- child->setChildNeedsLayout(true, false);

- if (!child->avoidsFloats() && child->containsFloats())

- toRenderBlock(child)->markAllDescendantsWithFloatsForLayout();

- // Our guess was wrong. Make the child lay itself out again.

- child->layoutIfNeeded();

- }

-void RenderBlock::clearFloatsIfNeeded(RenderBox* child, MarginInfo& marginInfo, int oldTopPosMargin, int oldTopNegMargin)

- int heightIncrease = getClearDelta(child);

- if (!heightIncrease)

- return;

- // The child needs to be lowered. Move the child so that it just clears the float.

- view()->addLayoutDelta(IntSize(0, -heightIncrease));

- child->setLocation(child->x(), child->y() + heightIncrease);

- if (child->isSelfCollapsingBlock()) {

- // For self-collapsing blocks that clear, they can still collapse their

- // margins with following siblings. Reset the current margins to represent

- // the self-collapsing block's margins only.

- marginInfo.setPosMargin(max(child->maxTopMargin(true), child->maxBottomMargin(true)));

- marginInfo.setNegMargin(max(child->maxTopMargin(false), child->maxBottomMargin(false)));

- // Adjust our height such that we are ready to be collapsed with subsequent siblings.

- setHeight(child->y() - max(0, marginInfo.margin()));

- // Set a flag that we cleared a float so that we know both to increase the height of the block

- // to compensate for the clear and to avoid collapsing our margins with the parent block's

- // bottom margin.

- marginInfo.setSelfCollapsingBlockClearedFloat(true);

- } else

- // Increase our height by the amount we had to clear.

- setHeight(height() + heightIncrease);

- if (marginInfo.canCollapseWithTop()) {

- // We can no longer collapse with the top of the block since a clear

- // occurred. The empty blocks collapse into the cleared block.

- // FIXME: This isn't quite correct. Need clarification for what to do

- // if the height the cleared block is offset by is smaller than the

- // margins involved.

- setMaxTopMargins(oldTopPosMargin, oldTopNegMargin);

- marginInfo.setAtTopOfBlock(false);

- }

- // If our value of clear caused us to be repositioned vertically to be

- // underneath a float, we might have to do another layout to take into account

- // the extra space we now have available.

- if (child->shrinkToAvoidFloats())

- // The child's width depends on the line width.

- // When the child shifts to clear an item, its width can

- // change (because it has more available line width).

- // So go ahead and mark the item as dirty.

- child->setChildNeedsLayout(true, false);

- if (!child->avoidsFloats() && child->containsFloats())

- toRenderBlock(child)->markAllDescendantsWithFloatsForLayout();

- child->layoutIfNeeded();

-int RenderBlock::estimateVerticalPosition(RenderBox* child, const MarginInfo& marginInfo)

- // FIXME: We need to eliminate the estimation of vertical position, because when it's wrong we sometimes trigger a pathological

- // relayout if there are intruding floats.

- int yPosEstimate = height();

- if (!marginInfo.canCollapseWithTop()) {

- int childMarginTop = child->selfNeedsLayout() ? child->marginTop() : child->collapsedMarginTop();

- yPosEstimate += max(marginInfo.margin(), childMarginTop);

- }

- return yPosEstimate;

-void RenderBlock::determineHorizontalPosition(RenderBox* child)

- if (style()->direction() == LTR) {

- int xPos = borderLeft() + paddingLeft();

- // Add in our left margin.

- int chPos = xPos + child->marginLeft();

- // Some objects (e.g., tables, horizontal rules, overflow:auto blocks) avoid floats. They need

- // to shift over as necessary to dodge any floats that might get in the way.

- if (child->avoidsFloats()) {

- int leftOff = leftOffset(height(), false);

- if (style()->textAlign() != WEBKIT_CENTER && child->style()->marginLeft().type() != Auto) {

- if (child->marginLeft() < 0)

- leftOff += child->marginLeft();

- chPos = max(chPos, leftOff); // Let the float sit in the child's margin if it can fit.

- }

- else if (leftOff != xPos) {

- // The object is shifting right. The object might be centered, so we need to

- // recalculate our horizontal margins. Note that the containing block content

- // width computation will take into account the delta between |leftOff| and |xPos|

- // so that we can just pass the content width in directly to the |calcHorizontalMargins|

- // function.

- child->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->y(), false));

- chPos = leftOff + child->marginLeft();

- }

- view()->addLayoutDelta(IntSize(child->x() - chPos, 0));

- child->setLocation(chPos, child->y());

- } else {

- int xPos = width() - borderRight() - paddingRight() - verticalScrollbarWidth();

- int chPos = xPos - (child->width() + child->marginRight());

- if (child->avoidsFloats()) {

- int rightOff = rightOffset(height(), false);

- if (style()->textAlign() != WEBKIT_CENTER && child->style()->marginRight().type() != Auto) {

- if (child->marginRight() < 0)

- rightOff -= child->marginRight();

- chPos = min(chPos, rightOff - child->width()); // Let the float sit in the child's margin if it can fit.

- } else if (rightOff != xPos) {

- // The object is shifting left. The object might be centered, so we need to

- // recalculate our horizontal margins. Note that the containing block content

- // width computation will take into account the delta between |rightOff| and |xPos|

- // so that we can just pass the content width in directly to the |calcHorizontalMargins|

- // function.

- child->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->y(), false));

- chPos = rightOff - child->marginRight() - child->width();

- }

- view()->addLayoutDelta(IntSize(child->x() - chPos, 0));

- child->setLocation(chPos, child->y());

- }

-void RenderBlock::setCollapsedBottomMargin(const MarginInfo& marginInfo)

- if (marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop()) {

- // Update our max pos/neg bottom margins, since we collapsed our bottom margins

- // with our children.

- setMaxBottomMargins(max(maxBottomPosMargin(), marginInfo.posMargin()), max(maxBottomNegMargin(), marginInfo.negMargin()));

- if (!marginInfo.bottomQuirk())

- setBottomMarginQuirk(false);

- if (marginInfo.bottomQuirk() && marginBottom() == 0)

- // We have no bottom margin and our last child has a quirky margin.

- // We will pick up this quirky margin and pass it through.

- // This deals with the <td><div><p> case.

- setBottomMarginQuirk(true);

- }

-void RenderBlock::handleBottomOfBlock(int top, int bottom, MarginInfo& marginInfo)

- // If our last flow was a self-collapsing block that cleared a float, then we don't

- // collapse it with the bottom of the block.

- if (!marginInfo.selfCollapsingBlockClearedFloat())

- marginInfo.setAtBottomOfBlock(true);

- else {

- // We have to special case the negative margin situation (where the collapsed

- // margin of the self-collapsing block is negative), since there's no need

- // to make an adjustment in that case.

- if (marginInfo.margin() < 0)

- marginInfo.clearMargin();

- }

- // If we can't collapse with children then go ahead and add in the bottom margin.

- if (!marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop()

- && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.bottomQuirk()))

- setHeight(height() + marginInfo.margin());

- // Now add in our bottom border/padding.

- setHeight(height() + bottom);

- // Negative margins can cause our height to shrink below our minimal height (border/padding).

- // If this happens, ensure that the computed height is increased to the minimal height.

- setHeight(max(height(), top + bottom));

- // Always make sure our overflow height is at least our height.

- m_overflowHeight = max(height(), m_overflowHeight);

- // Update our bottom collapsed margin info.

- setCollapsedBottomMargin(marginInfo);

-void RenderBlock::layoutBlockChildren(bool relayoutChildren, int& maxFloatBottom)

- if (gPercentHeightDescendantsMap) {

- if (HashSet<RenderBox*>* descendants = gPercentHeightDescendantsMap->get(this)) {

- HashSet<RenderBox*>::iterator end = descendants->end();

- for (HashSet<RenderBox*>::iterator it = descendants->begin(); it != end; ++it) {

- RenderBox* box = *it;

- while (box != this) {

- if (box->normalChildNeedsLayout())

- break;

- box->setChildNeedsLayout(true, false);

- box = box->containingBlock();

- ASSERT(box);

- if (!box)

- break;

- }

- int top = borderTop() + paddingTop();

- int bottom = borderBottom() + paddingBottom() + horizontalScrollbarHeight();

- m_overflowHeight = top;

- setHeight(m_overflowHeight);

- // The margin struct caches all our current margin collapsing state. The compact struct caches state when we encounter compacts,

- MarginInfo marginInfo(this, top, bottom);

- // Fieldsets need to find their legend and position it inside the border of the object.

- // The legend then gets skipped during normal layout.

- RenderObject* legend = layoutLegend(relayoutChildren);

- int previousFloatBottom = 0;

- maxFloatBottom = 0;

- RenderBox* child = firstChildBox();

- while (child) {

- if (legend == child) {

- child = child->nextSiblingBox();

- continue; // Skip the legend, since it has already been positioned up in the fieldset's border.

- }

- int oldTopPosMargin = maxTopPosMargin();

- int oldTopNegMargin = maxTopNegMargin();

- // Make sure we layout children if they need it.

- // FIXME: Technically percentage height objects only need a relayout if their percentage isn't going to be turned into

- // an auto value. Add a method to determine this, so that we can avoid the relayout.

- if (relayoutChildren || ((child->style()->height().isPercent() || child->style()->minHeight().isPercent() || child->style()->maxHeight().isPercent()) && !isRenderView()))

- child->setChildNeedsLayout(true, false);

- // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths.

- if (relayoutChildren && (child->style()->paddingLeft().isPercent() || child->style()->paddingRight().isPercent()))

- child->setPrefWidthsDirty(true, false);

- // Handle the four types of special elements first. These include positioned content, floating content, compacts and

- // run-ins. When we encounter these four types of objects, we don't actually lay them out as normal flow blocks.

- bool handled = false;

- RenderBox* next = handleSpecialChild(child, marginInfo, handled);

- if (handled) {

- child = next;

- continue;

- }

- // The child is a normal flow object. Compute its vertical margins now.

- child->calcVerticalMargins();

- // Do not allow a collapse if the margin top collapse style is set to SEPARATE.

- if (child->style()->marginTopCollapse() == MSEPARATE) {

- marginInfo.setAtTopOfBlock(false);

- marginInfo.clearMargin();

- }

- // Try to guess our correct y position. In most cases this guess will

- // be correct. Only if we're wrong (when we compute the real y position)

- // will we have to potentially relayout.

- int yPosEstimate = estimateVerticalPosition(child, marginInfo);

- // Cache our old rect so that we can dirty the proper repaint rects if the child moves.

- IntRect oldRect(child->x(), child->y() , child->width(), child->height());

-#ifndef NDEBUG

- IntSize oldLayoutDelta = view()->layoutDelta();

-#endif

- // Go ahead and position the child as though it didn't collapse with the top.

- view()->addLayoutDelta(IntSize(0, child->y() - yPosEstimate));

- child->setLocation(child->x(), yPosEstimate);

- bool markDescendantsWithFloats = false;

- if (yPosEstimate != oldRect.y() && !child->avoidsFloats() && child->containsFloats())

- markDescendantsWithFloats = true;

- else if (!child->avoidsFloats() || child->shrinkToAvoidFloats()) {

- // If an element might be affected by the presence of floats, then always mark it for

- // layout.

- int fb = max(previousFloatBottom, floatBottom());

- if (fb > height() || fb > yPosEstimate)

- markDescendantsWithFloats = true;

- }

- if (child->isRenderBlock()) {

- if (markDescendantsWithFloats)

- toRenderBlock(child)->markAllDescendantsWithFloatsForLayout();

- previousFloatBottom = max(previousFloatBottom, oldRect.y() + toRenderBlock(child)->floatBottom());

- }

- bool childHadLayout = child->m_everHadLayout;

- bool childNeededLayout = child->needsLayout();

- if (childNeededLayout)

- child->layout();

- // Now determine the correct ypos based off examination of collapsing margin

- // values.

- collapseMargins(child, marginInfo, yPosEstimate);

- // Now check for clear.

- clearFloatsIfNeeded(child, marginInfo, oldTopPosMargin, oldTopNegMargin);

- // We are no longer at the top of the block if we encounter a non-empty child.

- // This has to be done after checking for clear, so that margins can be reset if a clear occurred.

- if (marginInfo.atTopOfBlock() && !child->isSelfCollapsingBlock())

- marginInfo.setAtTopOfBlock(false);

- // Now place the child in the correct horizontal position

- determineHorizontalPosition(child);

- // Update our height now that the child has been placed in the correct position.

- setHeight(height() + child->height());

- if (child->style()->marginBottomCollapse() == MSEPARATE) {

- setHeight(height() + child->marginBottom());

- marginInfo.clearMargin();

- }

- // If the child has overhanging floats that intrude into following siblings (or possibly out

- // of this block), then the parent gets notified of the floats now.

- if (child->containsFloats())

- maxFloatBottom = max(maxFloatBottom, addOverhangingFloats(toRenderBlock(child), -child->x(), -child->y(), !childNeededLayout));

- // Update our overflow in case the child spills out the block.

- m_overflowTop = min(m_overflowTop, child->y() + child->overflowTop(false));

- m_overflowHeight = max(m_overflowHeight, height() + child->overflowHeight(false) - child->height());

- m_overflowWidth = max(child->x() + child->overflowWidth(false), m_overflowWidth);

- m_overflowLeft = min(child->x() + child->overflowLeft(false), m_overflowLeft);

- IntSize childOffset(child->x() - oldRect.x(), child->y() - oldRect.y());

- if (childOffset.width() || childOffset.height()) {

- view()->addLayoutDelta(childOffset);

- // If the child moved, we have to repaint it as well as any floating/positioned

- // descendants. An exception is if we need a layout. In this case, we know we're going to

- // repaint ourselves (and the child) anyway.

- if (childHadLayout && !selfNeedsLayout() && child->checkForRepaintDuringLayout())

- child->repaintDuringLayoutIfMoved(oldRect);

- }

- if (!childHadLayout && child->checkForRepaintDuringLayout())

- child->repaint();

- ASSERT(oldLayoutDelta == view()->layoutDelta());

- child = child->nextSiblingBox();

- }

- // Now do the handling of the bottom of the block, adding in our bottom border/padding and

- // determining the correct collapsed bottom margin information.

- handleBottomOfBlock(top, bottom, marginInfo);

-bool RenderBlock::layoutOnlyPositionedObjects()

- if (!posChildNeedsLayout() || normalChildNeedsLayout() || selfNeedsLayout())

- return false;

- LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), hasColumns() || hasTransform() || hasReflection());

- if (needsPositionedMovementLayout()) {

- tryLayoutDoingPositionedMovementOnly();

- if (needsLayout())

- return false;

- }

- // All we have to is lay out our positioned objects.

- layoutPositionedObjects(false);

- statePusher.pop();

- if (hasOverflowClip())

- m_layer->updateScrollInfoAfterLayout();

- setNeedsLayout(false);

- return true;

-void RenderBlock::layoutPositionedObjects(bool relayoutChildren)

- if (m_positionedObjects) {

- RenderBox* r;

- Iterator end = m_positionedObjects->end();

- for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {

- r = *it;

- // When a non-positioned block element moves, it may have positioned children that are implicitly positioned relative to the

- // non-positioned block. Rather than trying to detect all of these movement cases, we just always lay out positioned

- // objects that are positioned implicitly like this. Such objects are rare, and so in typical DHTML menu usage (where everything is

- // positioned explicitly) this should not incur a performance penalty.

- if (relayoutChildren || (r->hasStaticY() && r->parent() != this && r->parent()->isBlockFlow()))

- r->setChildNeedsLayout(true, false);

- // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths.

- //if (relayoutChildren && (r->style()->paddingLeft().isPercent() || r->style()->paddingRight().isPercent()))

- r->setPrefWidthsDirty(true, false);

- // We don't have to do a full layout. We just have to update our position. Try that first. If we have shrink-to-fit width

- // and we hit the available width constraint, the layoutIfNeeded() will catch it and do a full layout.

- if (r->needsPositionedMovementLayoutOnly())

- r->tryLayoutDoingPositionedMovementOnly();

- r->layoutIfNeeded();

- }

-void RenderBlock::markPositionedObjectsForLayout()

- if (m_positionedObjects) {

- RenderBox* r;

- Iterator end = m_positionedObjects->end();

- for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {

- r = *it;

- r->setChildNeedsLayout(true);

- }

-void RenderBlock::repaintOverhangingFloats(bool paintAllDescendants)

- // Repaint any overhanging floats (if we know we're the one to paint them).

- if (hasOverhangingFloats()) {

- // We think that we must be in a bad state if m_floatingObjects is nil at this point, so

- // we assert on Debug builds and nil-check Release builds.

- ASSERT(m_floatingObjects);

- if (!m_floatingObjects)

- return;

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- // FIXME: Avoid disabling LayoutState. At the very least, don't disable it for floats originating

- // in this block. Better yet would be to push extra state for the containers of other floats.

- view()->disableLayoutState();

- for ( ; (r = it.current()); ++it) {

- // Only repaint the object if it is overhanging, is not in its own layer, and

- // is our responsibility to paint (m_shouldPaint is set). When paintAllDescendants is true, the latter

- // condition is replaced with being a descendant of us.

- if (r->m_bottom > height() && (paintAllDescendants && r->m_renderer->isDescendantOf(this) || r->m_shouldPaint) && !r->m_renderer->hasLayer()) {

- r->m_renderer->repaint();

- r->m_renderer->repaintOverhangingFloats();

- }

- view()->enableLayoutState();

- }

-void RenderBlock::paint(PaintInfo& paintInfo, int tx, int ty)

- tx += x();

- ty += y();

- PaintPhase phase = paintInfo.phase;

- // Check if we need to do anything at all.

- // FIXME: Could eliminate the isRoot() check if we fix background painting so that the RenderView

- // paints the root's background.

- if (!isRoot()) {

- IntRect overflowBox = overflowRect(false);

- overflowBox.inflate(maximalOutlineSize(paintInfo.phase));

- overflowBox.move(tx, ty);

- if (!overflowBox.intersects(paintInfo.rect))

- return;

- }

- bool useControlClip = phase != PaintPhaseBlockBackground && phase != PaintPhaseSelfOutline && phase != PaintPhaseMask && hasControlClip();

- // Push a clip.

- if (useControlClip) {

- if (phase == PaintPhaseOutline)

- paintInfo.phase = PaintPhaseChildOutlines;

- else if (phase == PaintPhaseChildBlockBackground) {

- paintInfo.phase = PaintPhaseBlockBackground;

- paintObject(paintInfo, tx, ty);

- paintInfo.phase = PaintPhaseChildBlockBackgrounds;

- }

- IntRect clipRect(controlClipRect(tx, ty));

- if (clipRect.isEmpty())

- return;

- paintInfo.context->save();

- paintInfo.context->clip(clipRect);

- }

- paintObject(paintInfo, tx, ty);

- // Pop the clip.

- if (useControlClip) {

- paintInfo.context->restore();

- if (phase == PaintPhaseOutline) {

- paintInfo.phase = PaintPhaseSelfOutline;

- paintObject(paintInfo, tx, ty);

- paintInfo.phase = phase;

- } else if (phase == PaintPhaseChildBlockBackground)

- paintInfo.phase = phase;

- }

-void RenderBlock::paintColumns(PaintInfo& paintInfo, int tx, int ty, bool paintingFloats)

- // We need to do multiple passes, breaking up our child painting into strips.

- GraphicsContext* context = paintInfo.context;

- int currXOffset = 0;

- int currYOffset = 0;

- int ruleAdd = borderLeft() + paddingLeft();

- int ruleX = 0;

- int colGap = columnGap();

- const Color& ruleColor = style()->columnRuleColor();

- bool ruleTransparent = style()->columnRuleIsTransparent();

- EBorderStyle ruleStyle = style()->columnRuleStyle();

- int ruleWidth = style()->columnRuleWidth();

- bool renderRule = !paintingFloats && ruleStyle > BHIDDEN && !ruleTransparent && ruleWidth <= colGap;

- Vector<IntRect>* colRects = columnRects();

- unsigned colCount = colRects->size();

- for (unsigned i = 0; i < colCount; i++) {

- // For each rect, we clip to the rect, and then we adjust our coords.

- IntRect colRect = colRects->at(i);

- colRect.move(tx, ty);

- context->save();

- // Each strip pushes a clip, since column boxes are specified as being

- // like overflow:hidden.

- context->clip(colRect);

- // Adjust tx and ty to change where we paint.

- PaintInfo info(paintInfo);

- info.rect.intersect(colRect);

- // Adjust our x and y when painting.

- int finalX = tx + currXOffset;

- int finalY = ty + currYOffset;

- if (paintingFloats)

- paintFloats(info, finalX, finalY, paintInfo.phase == PaintPhaseSelection || paintInfo.phase == PaintPhaseTextClip);

- else

- paintContents(info, finalX, finalY);

- // Move to the next position.

- if (style()->direction() == LTR) {

- ruleX += colRect.width() + colGap / 2;

- currXOffset += colRect.width() + colGap;

- } else {

- ruleX -= (colRect.width() + colGap / 2);

- currXOffset -= (colRect.width() + colGap);

- }

- currYOffset -= colRect.height();

- context->restore();

- // Now paint the column rule.

- if (renderRule && paintInfo.phase == PaintPhaseForeground && i < colCount - 1) {

- int ruleStart = ruleX - ruleWidth / 2 + ruleAdd;

- int ruleEnd = ruleStart + ruleWidth;

- drawBorder(paintInfo.context, tx + ruleStart, ty + borderTop() + paddingTop(), tx + ruleEnd, ty + borderTop() + paddingTop() + contentHeight(),

- style()->direction() == LTR ? BSLeft : BSRight, ruleColor, style()->color(), ruleStyle, 0, 0);

- }

- ruleX = currXOffset;

- }

-void RenderBlock::paintContents(PaintInfo& paintInfo, int tx, int ty)

- // Avoid painting descendants of the root element when stylesheets haven't loaded. This eliminates FOUC.

- // It's ok not to draw, because later on, when all the stylesheets do load, updateStyleSelector on the Document

- // will do a full repaint().

- if (document()->didLayoutWithPendingStylesheets() && !isRenderView())

- return;

- if (childrenInline())

- m_lineBoxes.paint(this, paintInfo, tx, ty);

- else

- paintChildren(paintInfo, tx, ty);

-void RenderBlock::paintChildren(PaintInfo& paintInfo, int tx, int ty)

- PaintPhase newPhase = (paintInfo.phase == PaintPhaseChildOutlines) ? PaintPhaseOutline : paintInfo.phase;

- newPhase = (newPhase == PaintPhaseChildBlockBackgrounds) ? PaintPhaseChildBlockBackground : newPhase;

- // We don't paint our own background, but we do let the kids paint their backgrounds.

- PaintInfo info(paintInfo);

- info.phase = newPhase;

- info.paintingRoot = paintingRootForChildren(paintInfo);

- bool isPrinting = document()->printing();

- for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {

- // Check for page-break-before: always, and if it's set, break and bail.

- if (isPrinting && !childrenInline() && child->style()->pageBreakBefore() == PBALWAYS &&

- inRootBlockContext() && (ty + child->y()) > paintInfo.rect.y() &&

- (ty + child->y()) < paintInfo.rect.bottom()) {

- view()->setBestTruncatedAt(ty + child->y(), this, true);

- return;

- }

- if (!child->hasLayer() && !child->isFloating())

- child->paint(info, tx, ty);

- // Check for page-break-after: always, and if it's set, break and bail.

- if (isPrinting && !childrenInline() && child->style()->pageBreakAfter() == PBALWAYS &&

- inRootBlockContext() && (ty + child->y() + child->height()) > paintInfo.rect.y() &&

- (ty + child->y() + child->height()) < paintInfo.rect.bottom()) {

- view()->setBestTruncatedAt(ty + child->y() + child->height() + max(0, child->collapsedMarginBottom()), this, true);

- return;

- }

-void RenderBlock::paintCaret(PaintInfo& paintInfo, int tx, int ty, CaretType type)

- SelectionController* selection = type == CursorCaret ? document()->frame()->selection() : document()->frame()->dragCaretController();

- // Ask the SelectionController if the caret should be painted by this block

- RenderObject* caretPainter = selection->caretRenderer();

- if (caretPainter == this && selection->isContentEditable()) {

- // Convert the painting offset into the local coordinate system of this renderer,

- // to match the localCaretRect computed by the SelectionController

- offsetForContents(tx, ty);

- if (type == CursorCaret)

- document()->frame()->paintCaret(paintInfo.context, tx, ty, paintInfo.rect);

- else

- document()->frame()->paintDragCaret(paintInfo.context, tx, ty, paintInfo.rect);

- }

-void RenderBlock::paintObject(PaintInfo& paintInfo, int tx, int ty)

- PaintPhase paintPhase = paintInfo.phase;

- // 1. paint background, borders etc

- if ((paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) &&

- hasBoxDecorations() && style()->visibility() == VISIBLE) {

- paintBoxDecorations(paintInfo, tx, ty);

- }

- if (paintPhase == PaintPhaseMask && style()->visibility() == VISIBLE) {

- paintMask(paintInfo, tx, ty);

- return;

- }

- // We're done. We don't bother painting any children.

- if (paintPhase == PaintPhaseBlockBackground)

- return;

- // Adjust our painting position if we're inside a scrolled layer (e.g., an overflow:auto div).s

- int scrolledX = tx;

- int scrolledY = ty;

- if (hasOverflowClip())

- m_layer->subtractScrolledContentOffset(scrolledX, scrolledY);

- // 2. paint contents

- if (paintPhase != PaintPhaseSelfOutline) {

- if (hasColumns())

- paintColumns(paintInfo, scrolledX, scrolledY);

- else

- paintContents(paintInfo, scrolledX, scrolledY);

- }

- // 3. paint selection

- // FIXME: Make this work with multi column layouts. For now don't fill gaps.

- bool isPrinting = document()->printing();

- if (!isPrinting && !hasColumns())

- paintSelection(paintInfo, scrolledX, scrolledY); // Fill in gaps in selection on lines and between blocks.

- // 4. paint floats.

- if (paintPhase == PaintPhaseFloat || paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip) {

- if (hasColumns())

- paintColumns(paintInfo, scrolledX, scrolledY, true);

- else

- paintFloats(paintInfo, scrolledX, scrolledY, paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip);

- }

- // 5. paint outline.

- if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseSelfOutline) && hasOutline() && style()->visibility() == VISIBLE)

- paintOutline(paintInfo.context, tx, ty, width(), height(), style());

- // 6. paint continuation outlines.

- if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseChildOutlines)) {

- if (inlineContinuation() && inlineContinuation()->hasOutline() && inlineContinuation()->style()->visibility() == VISIBLE) {

- RenderInline* inlineRenderer = toRenderInline(inlineContinuation()->element()->renderer());

- if (!inlineRenderer->hasLayer())

- containingBlock()->addContinuationWithOutline(inlineRenderer);

- else if (!inlineRenderer->firstLineBox())

- inlineRenderer->paintOutline(paintInfo.context, tx - x() + inlineRenderer->containingBlock()->x(),

- ty - y() + inlineRenderer->containingBlock()->y());

- }

- paintContinuationOutlines(paintInfo, tx, ty);

- }

- // 7. paint caret.

- // If the caret's node's render object's containing block is this block, and the paint action is PaintPhaseForeground,

- // then paint the caret.

- if (paintPhase == PaintPhaseForeground) {

- paintCaret(paintInfo, scrolledX, scrolledY, CursorCaret);

- paintCaret(paintInfo, scrolledX, scrolledY, DragCaret);

- }

-void RenderBlock::paintFloats(PaintInfo& paintInfo, int tx, int ty, bool preservePhase)

- if (!m_floatingObjects)

- return;

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for (; (r = it.current()); ++it) {

- // Only paint the object if our m_shouldPaint flag is set.

- if (r->m_shouldPaint && !r->m_renderer->hasLayer()) {

- PaintInfo currentPaintInfo(paintInfo);

- currentPaintInfo.phase = preservePhase ? paintInfo.phase : PaintPhaseBlockBackground;

- int currentTX = tx + r->m_left - r->m_renderer->x() + r->m_renderer->marginLeft();

- int currentTY = ty + r->m_top - r->m_renderer->y() + r->m_renderer->marginTop();

- r->m_renderer->paint(currentPaintInfo, currentTX, currentTY);

- if (!preservePhase) {

- currentPaintInfo.phase = PaintPhaseChildBlockBackgrounds;

- r->m_renderer->paint(currentPaintInfo, currentTX, currentTY);

- currentPaintInfo.phase = PaintPhaseFloat;

- r->m_renderer->paint(currentPaintInfo, currentTX, currentTY);

- currentPaintInfo.phase = PaintPhaseForeground;

- r->m_renderer->paint(currentPaintInfo, currentTX, currentTY);

- currentPaintInfo.phase = PaintPhaseOutline;

- r->m_renderer->paint(currentPaintInfo, currentTX, currentTY);

- }

-void RenderBlock::paintEllipsisBoxes(PaintInfo& paintInfo, int tx, int ty)

- if (!shouldPaintWithinRoot(paintInfo) || !firstLineBox())

- return;

- if (style()->visibility() == VISIBLE && paintInfo.phase == PaintPhaseForeground) {

- // We can check the first box and last box and avoid painting if we don't

- // intersect.

- int yPos = ty + firstLineBox()->yPos();

- int h = lastLineBox()->yPos() + lastLineBox()->height() - firstLineBox()->yPos();

- if (yPos >= paintInfo.rect.bottom() || yPos + h <= paintInfo.rect.y())

- return;

- // See if our boxes intersect with the dirty rect. If so, then we paint

- // them. Note that boxes can easily overlap, so we can't make any assumptions

- // based off positions of our first line box or our last line box.

- for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {

- yPos = ty + curr->yPos();

- h = curr->height();

- if (curr->ellipsisBox() && yPos < paintInfo.rect.bottom() && yPos + h > paintInfo.rect.y())

- curr->paintEllipsisBox(paintInfo, tx, ty);

- }

-static ContinuationOutlineTableMap* continuationOutlineTable()

- DEFINE_STATIC_LOCAL(ContinuationOutlineTableMap, table, ());

- return &table;

-void RenderBlock::addContinuationWithOutline(RenderInline* flow)

- // We can't make this work if the inline is in a layer. We'll just rely on the broken

- // way of painting.

- ASSERT(!flow->layer() && !flow->isInlineContinuation());

- ContinuationOutlineTableMap* table = continuationOutlineTable();

- ListHashSet<RenderInline*>* continuations = table->get(this);

- if (!continuations) {

- continuations = new ListHashSet<RenderInline*>;

- table->set(this, continuations);

- }

- continuations->add(flow);

-void RenderBlock::paintContinuationOutlines(PaintInfo& info, int tx, int ty)

- ContinuationOutlineTableMap* table = continuationOutlineTable();

- if (table->isEmpty())

- return;

- ListHashSet<RenderInline*>* continuations = table->get(this);

- if (!continuations)

- return;

- // Paint each continuation outline.

- ListHashSet<RenderInline*>::iterator end = continuations->end();

- for (ListHashSet<RenderInline*>::iterator it = continuations->begin(); it != end; ++it) {

- // Need to add in the coordinates of the intervening blocks.

- RenderInline* flow = *it;

- RenderBlock* block = flow->containingBlock();

- for ( ; block && block != this; block = block->containingBlock()) {

- tx += block->x();

- ty += block->y();

- }

- ASSERT(block);

- flow->paintOutline(info.context, tx, ty);

- }

- // Delete

- delete continuations;

- table->remove(this);

-void RenderBlock::setSelectionState(SelectionState s)

- if (selectionState() == s)

- return;

- if (s == SelectionInside && selectionState() != SelectionNone)

- return;

- if ((s == SelectionStart && selectionState() == SelectionEnd) ||

- (s == SelectionEnd && selectionState() == SelectionStart))

- RenderBox::setSelectionState(SelectionBoth);

- else

- RenderBox::setSelectionState(s);

- RenderBlock* cb = containingBlock();

- if (cb && !cb->isRenderView())

- cb->setSelectionState(s);

-bool RenderBlock::shouldPaintSelectionGaps() const

- return selectionState() != SelectionNone && style()->visibility() == VISIBLE && isSelectionRoot();

-bool RenderBlock::isSelectionRoot() const

- if (!element())

- return false;

- // FIXME: Eventually tables should have to learn how to fill gaps between cells, at least in simple non-spanning cases.

- if (isTable())

- return false;

- if (isBody() || isRoot() || hasOverflowClip() || isRelPositioned() ||

- isFloatingOrPositioned() || isTableCell() || isInlineBlockOrInlineTable() || hasTransform() ||

- hasReflection() || hasMask())

- return true;

- if (view() && view()->selectionStart()) {

- Node* startElement = view()->selectionStart()->element();

- if (startElement && startElement->rootEditableElement() == element())

- return true;

- }

- return false;

-GapRects RenderBlock::selectionGapRectsForRepaint(RenderBox* /*repaintContainer*/)

- ASSERT(!needsLayout());

- if (!shouldPaintSelectionGaps())

- return GapRects();

- // FIXME: this is broken with transforms and a non-null repaintContainer

- FloatPoint absContentPoint = localToAbsolute(FloatPoint());

- if (hasOverflowClip())

- absContentPoint -= layer()->scrolledContentOffset();

- int lastTop = 0;

- int lastLeft = leftSelectionOffset(this, lastTop);

- int lastRight = rightSelectionOffset(this, lastTop);

- return fillSelectionGaps(this, absContentPoint.x(), absContentPoint.y(), absContentPoint.x(), absContentPoint.y(), lastTop, lastLeft, lastRight);

-void RenderBlock::paintSelection(PaintInfo& paintInfo, int tx, int ty)

- if (shouldPaintSelectionGaps() && paintInfo.phase == PaintPhaseForeground) {

- int lastTop = 0;

- int lastLeft = leftSelectionOffset(this, lastTop);

- int lastRight = rightSelectionOffset(this, lastTop);

- paintInfo.context->save();

- fillSelectionGaps(this, tx, ty, tx, ty, lastTop, lastLeft, lastRight, &paintInfo);

- paintInfo.context->restore();

- }

-static void clipOutPositionedObjects(const RenderObject::PaintInfo* paintInfo, int tx, int ty, ListHashSet<RenderBox*>* positionedObjects)

- if (!positionedObjects)

- return;

- ListHashSet<RenderBox*>::const_iterator end = positionedObjects->end();

- for (ListHashSet<RenderBox*>::const_iterator it = positionedObjects->begin(); it != end; ++it) {

- RenderBox* r = *it;

- paintInfo->context->clipOut(IntRect(tx + r->x(), ty + r->y(), r->width(), r->height()));

- }

-GapRects RenderBlock::fillSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,

- int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo)

- // IMPORTANT: Callers of this method that intend for painting to happen need to do a save/restore.

- // Clip out floating and positioned objects when painting selection gaps.

- if (paintInfo) {

- // Note that we don't clip out overflow for positioned objects. We just stick to the border box.

- clipOutPositionedObjects(paintInfo, tx, ty, m_positionedObjects);

- if (isBody() || isRoot()) // The <body> must make sure to examine its containingBlock's positioned objects.

- for (RenderBlock* cb = containingBlock(); cb && !cb->isRenderView(); cb = cb->containingBlock())

- clipOutPositionedObjects(paintInfo, cb->x(), cb->y(), cb->m_positionedObjects);

- if (m_floatingObjects) {

- for (DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects); it.current(); ++it) {

- FloatingObject* r = it.current();

- paintInfo->context->clipOut(IntRect(tx + r->m_left + r->m_renderer->marginLeft(),

- ty + r->m_top + r->m_renderer->marginTop(),

- r->m_renderer->width(), r->m_renderer->height()));

- }

- // FIXME: overflow: auto/scroll regions need more math here, since painting in the border box is different from painting in the padding box (one is scrolled, the other is

- // fixed).

- GapRects result;

- if (!isBlockFlow()) // FIXME: Make multi-column selection gap filling work someday.

- return result;

- if (hasColumns() || hasTransform()) {

- // FIXME: We should learn how to gap fill multiple columns and transforms eventually.

- lastTop = (ty - blockY) + height();

- lastLeft = leftSelectionOffset(rootBlock, height());

- lastRight = rightSelectionOffset(rootBlock, height());

- return result;

- }

- if (childrenInline())

- result = fillInlineSelectionGaps(rootBlock, blockX, blockY, tx, ty, lastTop, lastLeft, lastRight, paintInfo);

- else

- result = fillBlockSelectionGaps(rootBlock, blockX, blockY, tx, ty, lastTop, lastLeft, lastRight, paintInfo);

- // Go ahead and fill the vertical gap all the way to the bottom of our block if the selection extends past our block.

- if (rootBlock == this && (selectionState() != SelectionBoth && selectionState() != SelectionEnd))

- result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + height(),

- rootBlock, blockX, blockY, paintInfo));

- return result;

-GapRects RenderBlock::fillInlineSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,

- int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo)

- GapRects result;

- bool containsStart = selectionState() == SelectionStart || selectionState() == SelectionBoth;

- if (!firstLineBox()) {

- if (containsStart) {

- // Go ahead and update our lastY to be the bottom of the block. <hr>s or empty blocks with height can trip this

- // case.

- lastTop = (ty - blockY) + height();

- lastLeft = leftSelectionOffset(rootBlock, height());

- lastRight = rightSelectionOffset(rootBlock, height());

- }

- return result;

- }

- RootInlineBox* lastSelectedLine = 0;

- RootInlineBox* curr;

- for (curr = firstRootBox(); curr && !curr->hasSelectedChildren(); curr = curr->nextRootBox()) { }

- // Now paint the gaps for the lines.

- for (; curr && curr->hasSelectedChildren(); curr = curr->nextRootBox()) {

- int selTop = curr->selectionTop();

- int selHeight = curr->selectionHeight();

- if (!containsStart && !lastSelectedLine &&

- selectionState() != SelectionStart && selectionState() != SelectionBoth)

- result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + selTop,

- rootBlock, blockX, blockY, paintInfo));

- if (!paintInfo || ty + selTop < paintInfo->rect.bottom() && ty + selTop + selHeight > paintInfo->rect.y())

- result.unite(curr->fillLineSelectionGap(selTop, selHeight, rootBlock, blockX, blockY, tx, ty, paintInfo));

- lastSelectedLine = curr;

- }

- if (containsStart && !lastSelectedLine)

- // Selection must start just after our last line.

- lastSelectedLine = lastRootBox();

- if (lastSelectedLine && selectionState() != SelectionEnd && selectionState() != SelectionBoth) {

- // Go ahead and update our lastY to be the bottom of the last selected line.

- lastTop = (ty - blockY) + lastSelectedLine->bottomOverflow();

- lastLeft = leftSelectionOffset(rootBlock, lastSelectedLine->bottomOverflow());

- lastRight = rightSelectionOffset(rootBlock, lastSelectedLine->bottomOverflow());

- }

- return result;

-GapRects RenderBlock::fillBlockSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,

- int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo)

- GapRects result;

- // Go ahead and jump right to the first block child that contains some selected objects.

- RenderBox* curr;

- for (curr = firstChildBox(); curr && curr->selectionState() == SelectionNone; curr = curr->nextSiblingBox()) { }

- for (bool sawSelectionEnd = false; curr && !sawSelectionEnd; curr = curr->nextSiblingBox()) {

- SelectionState childState = curr->selectionState();

- if (childState == SelectionBoth || childState == SelectionEnd)

- sawSelectionEnd = true;

- if (curr->isFloatingOrPositioned())

- continue; // We must be a normal flow object in order to even be considered.

- if (curr->isRelPositioned() && curr->hasLayer()) {

- // If the relposition offset is anything other than 0, then treat this just like an absolute positioned element.

- // Just disregard it completely.

- IntSize relOffset = curr->layer()->relativePositionOffset();

- if (relOffset.width() || relOffset.height())

- continue;

- }

- bool paintsOwnSelection = curr->shouldPaintSelectionGaps() || curr->isTable(); // FIXME: Eventually we won't special-case table like this.

- bool fillBlockGaps = paintsOwnSelection || (curr->canBeSelectionLeaf() && childState != SelectionNone);

- if (fillBlockGaps) {

- // We need to fill the vertical gap above this object.

- if (childState == SelectionEnd || childState == SelectionInside)

- // Fill the gap above the object.

- result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight,

- ty + curr->y(), rootBlock, blockX, blockY, paintInfo));

- // Only fill side gaps for objects that paint their own selection if we know for sure the selection is going to extend all the way *past*

- // our object. We know this if the selection did not end inside our object.

- if (paintsOwnSelection && (childState == SelectionStart || sawSelectionEnd))

- childState = SelectionNone;

- // Fill side gaps on this object based off its state.

- bool leftGap, rightGap;

- getHorizontalSelectionGapInfo(childState, leftGap, rightGap);

- if (leftGap)

- result.uniteLeft(fillLeftSelectionGap(this, curr->x(), curr->y(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo));

- if (rightGap)

- result.uniteRight(fillRightSelectionGap(this, curr->x() + curr->width(), curr->y(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo));

- // Update lastTop to be just underneath the object. lastLeft and lastRight extend as far as

- // they can without bumping into floating or positioned objects. Ideally they will go right up

- // to the border of the root selection block.

- lastTop = (ty - blockY) + (curr->y() + curr->height());

- lastLeft = leftSelectionOffset(rootBlock, curr->y() + curr->height());

- lastRight = rightSelectionOffset(rootBlock, curr->y() + curr->height());

- } else if (childState != SelectionNone)

- // We must be a block that has some selected object inside it. Go ahead and recur.

- result.unite(toRenderBlock(curr)->fillSelectionGaps(rootBlock, blockX, blockY, tx + curr->x(), ty + curr->y(),

- lastTop, lastLeft, lastRight, paintInfo));

- }

- return result;

-IntRect RenderBlock::fillHorizontalSelectionGap(RenderObject* selObj, int xPos, int yPos, int width, int height, const PaintInfo* paintInfo)

- if (width <= 0 || height <= 0)

- return IntRect();

- IntRect gapRect(xPos, yPos, width, height);

- if (paintInfo && selObj->style()->visibility() == VISIBLE)

- paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor());

- return gapRect;

-IntRect RenderBlock::fillVerticalSelectionGap(int lastTop, int lastLeft, int lastRight, int bottomY, RenderBlock* rootBlock,

- int blockX, int blockY, const PaintInfo* paintInfo)

- int top = blockY + lastTop;

- int height = bottomY - top;

- if (height <= 0)

- return IntRect();

- // Get the selection offsets for the bottom of the gap

- int left = blockX + max(lastLeft, leftSelectionOffset(rootBlock, bottomY));

- int right = blockX + min(lastRight, rightSelectionOffset(rootBlock, bottomY));

- int width = right - left;

- if (width <= 0)

- return IntRect();

- IntRect gapRect(left, top, width, height);

- if (paintInfo)

- paintInfo->context->fillRect(gapRect, selectionBackgroundColor());

- return gapRect;

-IntRect RenderBlock::fillLeftSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock,

- int blockX, int /*blockY*/, int tx, int ty, const PaintInfo* paintInfo)

- int top = yPos + ty;

- int left = blockX + max(leftSelectionOffset(rootBlock, yPos), leftSelectionOffset(rootBlock, yPos + height));

- int right = min(xPos + tx, blockX + min(rightSelectionOffset(rootBlock, yPos), rightSelectionOffset(rootBlock, yPos + height)));

- int width = right - left;

- if (width <= 0)

- return IntRect();

- IntRect gapRect(left, top, width, height);

- if (paintInfo)

- paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor());

- return gapRect;

-IntRect RenderBlock::fillRightSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock,

- int blockX, int /*blockY*/, int tx, int ty, const PaintInfo* paintInfo)

- int left = max(xPos + tx, blockX + max(leftSelectionOffset(rootBlock, yPos), leftSelectionOffset(rootBlock, yPos + height)));

- int top = yPos + ty;

- int right = blockX + min(rightSelectionOffset(rootBlock, yPos), rightSelectionOffset(rootBlock, yPos + height));

- int width = right - left;

- if (width <= 0)

- return IntRect();

- IntRect gapRect(left, top, width, height);

- if (paintInfo)

- paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor());

- return gapRect;

-void RenderBlock::getHorizontalSelectionGapInfo(SelectionState state, bool& leftGap, bool& rightGap)

- bool ltr = style()->direction() == LTR;

- leftGap = (state == RenderObject::SelectionInside) ||

- (state == RenderObject::SelectionEnd && ltr) ||

- (state == RenderObject::SelectionStart && !ltr);

- rightGap = (state == RenderObject::SelectionInside) ||

- (state == RenderObject::SelectionStart && ltr) ||

- (state == RenderObject::SelectionEnd && !ltr);

-int RenderBlock::leftSelectionOffset(RenderBlock* rootBlock, int yPos)

- int left = leftOffset(yPos, false);

- if (left == borderLeft() + paddingLeft()) {

- if (rootBlock != this)

- // The border can potentially be further extended by our containingBlock().

- return containingBlock()->leftSelectionOffset(rootBlock, yPos + y());

- return left;

- }

- else {

- RenderBlock* cb = this;

- while (cb != rootBlock) {

- left += cb->x();

- cb = cb->containingBlock();

- }

- return left;

-int RenderBlock::rightSelectionOffset(RenderBlock* rootBlock, int yPos)

- int right = rightOffset(yPos, false);

- if (right == (contentWidth() + (borderLeft() + paddingLeft()))) {

- if (rootBlock != this)

- // The border can potentially be further extended by our containingBlock().

- return containingBlock()->rightSelectionOffset(rootBlock, yPos + y());

- return right;

- }

- else {

- RenderBlock* cb = this;

- while (cb != rootBlock) {

- right += cb->x();

- cb = cb->containingBlock();

- }

- return right;

-void RenderBlock::insertPositionedObject(RenderBox* o)

- // Create the list of special objects if we don't aleady have one

- if (!m_positionedObjects)

- m_positionedObjects = new ListHashSet<RenderBox*>;

- m_positionedObjects->add(o);

-void RenderBlock::removePositionedObject(RenderBox* o)

- if (m_positionedObjects)

- m_positionedObjects->remove(o);

-void RenderBlock::removePositionedObjects(RenderBlock* o)

- if (!m_positionedObjects)

- return;

- RenderBox* r;

- Iterator end = m_positionedObjects->end();

- Vector<RenderBox*, 16> deadObjects;

- for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {

- r = *it;

- if (!o || r->isDescendantOf(o)) {

- if (o)

- r->setChildNeedsLayout(true, false);

- // It is parent blocks job to add positioned child to positioned objects list of its containing block

- // Parent layout needs to be invalidated to ensure this happens.

- RenderObject* p = r->parent();

- while (p && !p->isRenderBlock())

- p = p->parent();

- if (p)

- p->setChildNeedsLayout(true);

- deadObjects.append(r);

- }

- for (unsigned i = 0; i < deadObjects.size(); i++)

- m_positionedObjects->remove(deadObjects.at(i));

-void RenderBlock::insertFloatingObject(RenderBox* o)

- ASSERT(o->isFloating());

- // Create the list of special objects if we don't aleady have one

- if (!m_floatingObjects) {

- m_floatingObjects = new DeprecatedPtrList<FloatingObject>;

- m_floatingObjects->setAutoDelete(true);

- } else {

- // Don't insert the object again if it's already in the list

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- FloatingObject* f;

- while ( (f = it.current()) ) {

- if (f->m_renderer == o) return;

- ++it;

- }

- // Create the special object entry & append it to the list

- o->layoutIfNeeded();

- FloatingObject* newObj = new FloatingObject(o->style()->floating() == FLEFT ? FloatingObject::FloatLeft : FloatingObject::FloatRight);

- newObj->m_top = -1;

- newObj->m_bottom = -1;

- newObj->m_width = o->width() + o->marginLeft() + o->marginRight();

- newObj->m_shouldPaint = !o->hasLayer(); // If a layer exists, the float will paint itself. Otherwise someone else will.

- newObj->m_isDescendant = true;

- newObj->m_renderer = o;

- m_floatingObjects->append(newObj);

-void RenderBlock::removeFloatingObject(RenderBox* o)

- if (m_floatingObjects) {

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- while (it.current()) {

- if (it.current()->m_renderer == o) {

- if (childrenInline())

- markLinesDirtyInVerticalRange(0, it.current()->m_bottom);

- m_floatingObjects->removeRef(it.current());

- }

- ++it;

- }

-bool RenderBlock::positionNewFloats()

- if (!m_floatingObjects)

- return false;

- FloatingObject* f = m_floatingObjects->last();

- // If all floats have already been positioned, then we have no work to do.

- if (!f || f->m_top != -1)

- return false;

- // Move backwards through our floating object list until we find a float that has

- // already been positioned. Then we'll be able to move forward, positioning all of

- // the new floats that need it.

- FloatingObject* lastFloat = m_floatingObjects->getPrev();

- while (lastFloat && lastFloat->m_top == -1) {

- f = m_floatingObjects->prev();

- lastFloat = m_floatingObjects->getPrev();

- }

- int y = height();

- // The float cannot start above the y position of the last positioned float.

- if (lastFloat)

- y = max(lastFloat->m_top, y);

- // Now walk through the set of unpositioned floats and place them.

- while (f) {

- // The containing block is responsible for positioning floats, so if we have floats in our

- // list that come from somewhere else, do not attempt to position them.

- if (f->m_renderer->containingBlock() != this) {

- f = m_floatingObjects->next();

- continue;

- }

- RenderBox* o = f->m_renderer;

- int _height = o->height() + o->marginTop() + o->marginBottom();

- int ro = rightOffset(); // Constant part of right offset.

- int lo = leftOffset(); // Constat part of left offset.

- int fwidth = f->m_width; // The width we look for.

- if (ro - lo < fwidth)

- fwidth = ro - lo; // Never look for more than what will be available.

- IntRect oldRect(o->x(), o->y() , o->width(), o->height());

- if (o->style()->clear() & CLEFT)

- y = max(leftBottom(), y);

- if (o->style()->clear() & CRIGHT)

- y = max(rightBottom(), y);

- if (o->style()->floating() == FLEFT) {

- int heightRemainingLeft = 1;

- int heightRemainingRight = 1;

- int fx = leftRelOffset(y,lo, false, &heightRemainingLeft);

- while (rightRelOffset(y,ro, false, &heightRemainingRight)-fx < fwidth) {

- y += min(heightRemainingLeft, heightRemainingRight);

- fx = leftRelOffset(y,lo, false, &heightRemainingLeft);

- }

- fx = max(0, fx);

- f->m_left = fx;

- o->setLocation(fx + o->marginLeft(), y + o->marginTop());

- } else {

- int heightRemainingLeft = 1;

- int heightRemainingRight = 1;

- int fx = rightRelOffset(y,ro, false, &heightRemainingRight);

- while (fx - leftRelOffset(y,lo, false, &heightRemainingLeft) < fwidth) {

- y += min(heightRemainingLeft, heightRemainingRight);

- fx = rightRelOffset(y, ro, false, &heightRemainingRight);

- }

- f->m_left = fx - f->m_width;

- o->setLocation(fx - o->marginRight() - o->width(), y + o->marginTop());

- }

- f->m_top = y;

- f->m_bottom = f->m_top + _height;

- // If the child moved, we have to repaint it.

- if (o->checkForRepaintDuringLayout())

- o->repaintDuringLayoutIfMoved(oldRect);

- f = m_floatingObjects->next();

- }

- return true;

-void RenderBlock::newLine(EClear clear)

- positionNewFloats();

- // set y position

- int newY = 0;

- switch(clear)

- {

- case CLEFT:

- newY = leftBottom();

- break;

- case CRIGHT:

- newY = rightBottom();

- break;

- case CBOTH:

- newY = floatBottom();

- default:

- break;

- }

- if (height() < newY)

- setHeight(newY);

-void RenderBlock::addPercentHeightDescendant(RenderBox* descendant)

- if (!gPercentHeightDescendantsMap) {

- gPercentHeightDescendantsMap = new PercentHeightDescendantsMap;

- gPercentHeightContainerMap = new PercentHeightContainerMap;

- }

- HashSet<RenderBox*>* descendantSet = gPercentHeightDescendantsMap->get(this);

- if (!descendantSet) {

- descendantSet = new HashSet<RenderBox*>;

- gPercentHeightDescendantsMap->set(this, descendantSet);

- }

- bool added = descendantSet->add(descendant).second;

- if (!added) {

- ASSERT(gPercentHeightContainerMap->get(descendant));

- ASSERT(gPercentHeightContainerMap->get(descendant)->contains(this));

- return;

- }

- HashSet<RenderBlock*>* containerSet = gPercentHeightContainerMap->get(descendant);

- if (!containerSet) {

- containerSet = new HashSet<RenderBlock*>;

- gPercentHeightContainerMap->set(descendant, containerSet);

- }

- ASSERT(!containerSet->contains(this));

- containerSet->add(this);

-void RenderBlock::removePercentHeightDescendant(RenderBox* descendant)

- if (!gPercentHeightContainerMap)

- return;

- HashSet<RenderBlock*>* containerSet = gPercentHeightContainerMap->take(descendant);

- if (!containerSet)

- return;

- HashSet<RenderBlock*>::iterator end = containerSet->end();

- for (HashSet<RenderBlock*>::iterator it = containerSet->begin(); it != end; ++it) {

- RenderBlock* container = *it;

- HashSet<RenderBox*>* descendantSet = gPercentHeightDescendantsMap->get(container);

- ASSERT(descendantSet);

- if (!descendantSet)

- continue;

- ASSERT(descendantSet->contains(descendant));

- descendantSet->remove(descendant);

- if (descendantSet->isEmpty()) {

- gPercentHeightDescendantsMap->remove(container);

- delete descendantSet;

- }

- delete containerSet;

-int RenderBlock::leftOffset() const

- return borderLeft() + paddingLeft();

-int RenderBlock::leftRelOffset(int y, int fixedOffset, bool applyTextIndent, int* heightRemaining) const

- int left = fixedOffset;

- if (m_floatingObjects) {

- if ( heightRemaining ) *heightRemaining = 1;

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for ( ; (r = it.current()); ++it )

- {

- if (r->m_top <= y && r->m_bottom > y &&

- r->type() == FloatingObject::FloatLeft &&

- r->m_left + r->m_width > left) {

- left = r->m_left + r->m_width;

- if ( heightRemaining ) *heightRemaining = r->m_bottom - y;

- }

- if (applyTextIndent && style()->direction() == LTR) {

- int cw = 0;

- if (style()->textIndent().isPercent())

- cw = containingBlock()->availableWidth();

- left += style()->textIndent().calcMinValue(cw);

- }

- return left;

-int RenderBlock::rightOffset() const

- return borderLeft() + paddingLeft() + availableWidth();

-int RenderBlock::rightRelOffset(int y, int fixedOffset, bool applyTextIndent, int* heightRemaining) const

- int right = fixedOffset;

- if (m_floatingObjects) {

- if (heightRemaining) *heightRemaining = 1;

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for ( ; (r = it.current()); ++it )

- {

- if (r->m_top <= y && r->m_bottom > y &&

- r->type() == FloatingObject::FloatRight &&

- r->m_left < right) {

- right = r->m_left;

- if ( heightRemaining ) *heightRemaining = r->m_bottom - y;

- }

- if (applyTextIndent && style()->direction() == RTL) {

- int cw = 0;

- if (style()->textIndent().isPercent())

- cw = containingBlock()->availableWidth();

- right -= style()->textIndent().calcMinValue(cw);

- }

- return right;

-int

-RenderBlock::lineWidth(int y, bool firstLine) const

- int result = rightOffset(y, firstLine) - leftOffset(y, firstLine);

- return (result < 0) ? 0 : result;

-int RenderBlock::nextFloatBottomBelow(int height) const

- if (!m_floatingObjects)

- return 0;

- int bottom = INT_MAX;

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for ( ; (r = it.current()); ++it) {

- if (r->m_bottom > height)

- bottom = min(r->m_bottom, bottom);

- }

- return bottom == INT_MAX ? 0 : bottom;

-int

-RenderBlock::floatBottom() const

- if (!m_floatingObjects) return 0;

- int bottom=0;

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for ( ; (r = it.current()); ++it )

- if (r->m_bottom>bottom)

- bottom=r->m_bottom;

- return bottom;

-IntRect RenderBlock::floatRect() const

- IntRect result;

- if (!m_floatingObjects || hasOverflowClip())

- return result;

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for (; (r = it.current()); ++it) {

- if (r->m_shouldPaint && !r->m_renderer->hasLayer()) {

- IntRect childRect = r->m_renderer->overflowRect(false);

- childRect.move(r->m_left + r->m_renderer->marginLeft(), r->m_top + r->m_renderer->marginTop());

- result.unite(childRect);

- }

- return result;

-int RenderBlock::lowestPosition(bool includeOverflowInterior, bool includeSelf) const

- if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip()))

- return includeSelf && width() > 0 ? overflowHeight(false) : 0;

- int bottom = includeSelf && width() > 0 ? height() : 0;

- if (!hasColumns()) {

- // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids.

- // For now, we have to descend into all the children, since we may have a huge abs div inside

- // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to

- // the abs div.

- for (RenderObject* c = firstChild(); c; c = c->nextSibling()) {

- if (!c->isFloatingOrPositioned() && !c->isText() && !c->isRenderInline())

- bottom = max(bottom, toRenderBox(c)->y() + c->lowestPosition(false));

- }

- if (includeSelf && isRelPositioned())

- bottom += relativePositionOffsetY();

- if (!includeOverflowInterior && hasOverflowClip())

- return bottom;

- int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetY() : 0;

- if (includeSelf)

- bottom = max(bottom, m_overflowHeight + relativeOffset);

- if (m_positionedObjects) {

- RenderBox* r;

- Iterator end = m_positionedObjects->end();

- for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {

- r = *it;

- // Fixed positioned objects do not scroll and thus should not constitute

- // part of the lowest position.

- if (r->style()->position() != FixedPosition) {

- // FIXME: Should work for overflow sections too.

- // If a positioned object lies completely to the left of the root it will be unreachable via scrolling.

- // Therefore we should not allow it to contribute to the lowest position.

- if (!isRenderView() || r->x() + r->width() > 0 || r->x() + r->rightmostPosition(false) > 0) {

- int lp = r->y() + r->lowestPosition(false);

- bottom = max(bottom, lp + relativeOffset);

- }

- if (hasColumns()) {

- Vector<IntRect>* colRects = columnRects();

- for (unsigned i = 0; i < colRects->size(); i++)

- bottom = max(bottom, colRects->at(i).bottom() + relativeOffset);

- return bottom;

- }

- if (m_floatingObjects) {

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for ( ; (r = it.current()); ++it ) {

- if (r->m_shouldPaint || r->m_renderer->hasLayer()) {

- int lp = r->m_top + r->m_renderer->marginTop() + r->m_renderer->lowestPosition(false);

- bottom = max(bottom, lp + relativeOffset);

- }

- if (!includeSelf && lastLineBox()) {

- int lp = lastLineBox()->yPos() + lastLineBox()->height();

- bottom = max(bottom, lp);

- }

- return bottom;

-int RenderBlock::rightmostPosition(bool includeOverflowInterior, bool includeSelf) const

- if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip()))

- return includeSelf && height() > 0 ? overflowWidth(false) : 0;

- int right = includeSelf && height() > 0 ? width() : 0;

- if (!hasColumns()) {

- // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids.

- // For now, we have to descend into all the children, since we may have a huge abs div inside

- // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to

- // the abs div.

- for (RenderObject* c = firstChild(); c; c = c->nextSibling()) {

- if (!c->isFloatingOrPositioned() && c->isBox() && !c->isRenderInline())

- right = max(right, toRenderBox(c)->x() + c->rightmostPosition(false));

- }

- if (includeSelf && isRelPositioned())

- right += relativePositionOffsetX();

- if (!includeOverflowInterior && hasOverflowClip())

- return right;

- int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetX() : 0;

- if (includeSelf)

- right = max(right, m_overflowWidth + relativeOffset);

- if (m_positionedObjects) {

- RenderBox* r;

- Iterator end = m_positionedObjects->end();

- for (Iterator it = m_positionedObjects->begin() ; it != end; ++it) {

- r = *it;

- // Fixed positioned objects do not scroll and thus should not constitute

- // part of the rightmost position.

- if (r->style()->position() != FixedPosition) {

- // FIXME: Should work for overflow sections too.

- // If a positioned object lies completely above the root it will be unreachable via scrolling.

- // Therefore we should not allow it to contribute to the rightmost position.

- if (!isRenderView() || r->y() + r->height() > 0 || r->y() + r->lowestPosition(false) > 0) {

- int rp = r->x() + r->rightmostPosition(false);

- right = max(right, rp + relativeOffset);

- }

- if (hasColumns()) {

- // This only matters for LTR

- if (style()->direction() == LTR)

- right = max(columnRects()->last().right() + relativeOffset, right);

- return right;

- }

- if (m_floatingObjects) {

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for ( ; (r = it.current()); ++it ) {

- if (r->m_shouldPaint || r->m_renderer->hasLayer()) {

- int rp = r->m_left + r->m_renderer->marginLeft() + r->m_renderer->rightmostPosition(false);

- right = max(right, rp + relativeOffset);

- }

- if (!includeSelf && firstLineBox()) {

- for (InlineRunBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) {

- int rp = currBox->xPos() + currBox->width();

- // If this node is a root editable element, then the rightmostPosition should account for a caret at the end.

- // FIXME: Need to find another way to do this, since scrollbars could show when we don't want them to.

- if (node()->isContentEditable() && node() == node()->rootEditableElement() && style()->direction() == LTR)

- rp += 1;

- right = max(right, rp);

- }

- return right;

-int RenderBlock::leftmostPosition(bool includeOverflowInterior, bool includeSelf) const

- if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip()))

- return includeSelf && height() > 0 ? overflowLeft(false) : width();

- int left = includeSelf && height() > 0 ? 0 : width();

- if (!hasColumns()) {

- // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids.

- // For now, we have to descend into all the children, since we may have a huge abs div inside

- // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to

- // the abs div.

- for (RenderObject* c = firstChild(); c; c = c->nextSibling()) {

- if (!c->isFloatingOrPositioned() && c->isBox() && !c->isRenderInline())

- left = min(left, toRenderBox(c)->x() + c->leftmostPosition(false));

- }

- if (includeSelf && isRelPositioned())

- left += relativePositionOffsetX();

- if (!includeOverflowInterior && hasOverflowClip())

- return left;

- int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetX() : 0;

- if (includeSelf)

- left = min(left, m_overflowLeft + relativeOffset);

- if (m_positionedObjects) {

- RenderBox* r;

- Iterator end = m_positionedObjects->end();

- for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {

- r = *it;

- // Fixed positioned objects do not scroll and thus should not constitute

- // part of the leftmost position.

- if (r->style()->position() != FixedPosition) {

- // FIXME: Should work for overflow sections too.

- // If a positioned object lies completely above the root it will be unreachable via scrolling.

- // Therefore we should not allow it to contribute to the leftmost position.

- if (!isRenderView() || r->y() + r->height() > 0 || r->y() + r->lowestPosition(false) > 0) {

- int lp = r->x() + r->leftmostPosition(false);

- left = min(left, lp + relativeOffset);

- }

- if (hasColumns()) {

- // This only matters for RTL

- if (style()->direction() == RTL)

- left = min(columnRects()->last().x() + relativeOffset, left);

- return left;

- }

- if (m_floatingObjects) {

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for ( ; (r = it.current()); ++it ) {

- if (r->m_shouldPaint || r->m_renderer->hasLayer()) {

- int lp = r->m_left + r->m_renderer->marginLeft() + r->m_renderer->leftmostPosition(false);

- left = min(left, lp + relativeOffset);

- }

- if (!includeSelf && firstLineBox()) {

- for (InlineRunBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox())

- left = min(left, (int)currBox->xPos());

- }

- return left;

-int

-RenderBlock::leftBottom()

- if (!m_floatingObjects) return 0;

- int bottom=0;

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for ( ; (r = it.current()); ++it )

- if (r->m_bottom > bottom && r->type() == FloatingObject::FloatLeft)

- bottom=r->m_bottom;

- return bottom;

-int

-RenderBlock::rightBottom()

- if (!m_floatingObjects) return 0;

- int bottom=0;

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for ( ; (r = it.current()); ++it )

- if (r->m_bottom>bottom && r->type() == FloatingObject::FloatRight)

- bottom=r->m_bottom;

- return bottom;

-void RenderBlock::markLinesDirtyInVerticalRange(int top, int bottom)

- if (top >= bottom)

- return;

- RootInlineBox* lowestDirtyLine = lastRootBox();

- RootInlineBox* afterLowest = lowestDirtyLine;

- while (lowestDirtyLine && lowestDirtyLine->blockHeight() >= bottom) {

- afterLowest = lowestDirtyLine;

- lowestDirtyLine = lowestDirtyLine->prevRootBox();

- }

- while (afterLowest && afterLowest->blockHeight() >= top) {

- afterLowest->markDirty();

- afterLowest = afterLowest->prevRootBox();

- }

-void RenderBlock::clearFloats()

- // Inline blocks are covered by the isReplaced() check in the avoidFloats method.

- if (avoidsFloats() || isRoot() || isRenderView() || isFloatingOrPositioned() || isTableCell()) {

- if (m_floatingObjects)

- m_floatingObjects->clear();

- return;

- }

- typedef HashMap<RenderObject*, FloatingObject*> RendererToFloatInfoMap;

- RendererToFloatInfoMap floatMap;

- if (m_floatingObjects) {

- if (childrenInline()) {

- m_floatingObjects->first();

- while (FloatingObject* f = m_floatingObjects->take())

- floatMap.add(f->m_renderer, f);

- } else

- m_floatingObjects->clear();

- }

- // Attempt to locate a previous sibling with overhanging floats. We skip any elements that are

- // out of flow (like floating/positioned elements), and we also skip over any objects that may have shifted

- // to avoid floats.

- bool parentHasFloats = false;

- RenderObject* prev = previousSibling();

- while (prev && (!prev->isBox() || !prev->isRenderBlock() || prev->avoidsFloats() || prev->isFloatingOrPositioned())) {

- if (prev->isFloating())

- parentHasFloats = true;

- prev = prev->previousSibling();

- }

- // First add in floats from the parent.

- int offset = y();

- if (parentHasFloats) {

- RenderBlock* parentBlock = static_cast<RenderBlock *>(parent());

- addIntrudingFloats(parentBlock, parentBlock->borderLeft() + parentBlock->paddingLeft(), offset);

- }

- int xoffset = 0;

- if (prev)

- offset -= toRenderBox(prev)->y();

- else if (parent()->isBox()) {

- prev = parent();

- xoffset += toRenderBox(prev)->borderLeft() + toRenderBox(prev)->paddingLeft();

- }

- // Add overhanging floats from the previous RenderBlock, but only if it has a float that intrudes into our space.

- if (!prev || !prev->isRenderBlock())

- return;

- RenderBlock* block = static_cast<RenderBlock *>(prev);

- if (block->m_floatingObjects && block->floatBottom() > offset)

- addIntrudingFloats(block, xoffset, offset);

- if (childrenInline()) {

- int changeTop = INT_MAX;

- int changeBottom = INT_MIN;

- if (m_floatingObjects) {

- for (FloatingObject* f = m_floatingObjects->first(); f; f = m_floatingObjects->next()) {

- FloatingObject* oldFloatingObject = floatMap.get(f->m_renderer);

- if (oldFloatingObject) {

- if (f->m_width != oldFloatingObject->m_width || f->m_left != oldFloatingObject->m_left) {

- changeTop = 0;

- changeBottom = max(changeBottom, max(f->m_bottom, oldFloatingObject->m_bottom));

- } else if (f->m_bottom != oldFloatingObject->m_bottom) {

- changeTop = min(changeTop, min(f->m_bottom, oldFloatingObject->m_bottom));

- changeBottom = max(changeBottom, max(f->m_bottom, oldFloatingObject->m_bottom));

- }

- floatMap.remove(f->m_renderer);

- delete oldFloatingObject;

- } else {

- changeTop = 0;

- changeBottom = max(changeBottom, f->m_bottom);

- }

- RendererToFloatInfoMap::iterator end = floatMap.end();

- for (RendererToFloatInfoMap::iterator it = floatMap.begin(); it != end; ++it) {

- FloatingObject* floatingObject = (*it).second;

- if (!floatingObject->m_isDescendant) {

- changeTop = 0;

- changeBottom = max(changeBottom, floatingObject->m_bottom);

- }

- deleteAllValues(floatMap);

- markLinesDirtyInVerticalRange(changeTop, changeBottom);

- }

-int RenderBlock::addOverhangingFloats(RenderBlock* child, int xoff, int yoff, bool makeChildPaintOtherFloats)

- // Prevent floats from being added to the canvas by the root element, e.g., <html>.

- if (child->hasOverflowClip() || !child->containsFloats() || child->isRoot())

- return 0;

- int lowestFloatBottom = 0;

- // Floats that will remain the child's responsiblity to paint should factor into its

- // visual overflow.

- IntRect floatsOverflowRect;

- DeprecatedPtrListIterator<FloatingObject> it(*child->m_floatingObjects);

- for (FloatingObject* r; (r = it.current()); ++it) {

- int bottom = child->y() + r->m_bottom;

- lowestFloatBottom = max(lowestFloatBottom, bottom);

- if (bottom > height()) {

- // If the object is not in the list, we add it now.

- if (!containsFloat(r->m_renderer)) {

- FloatingObject *floatingObj = new FloatingObject(r->type());

- floatingObj->m_top = r->m_top - yoff;

- floatingObj->m_bottom = r->m_bottom - yoff;

- floatingObj->m_left = r->m_left - xoff;

- floatingObj->m_width = r->m_width;

- floatingObj->m_renderer = r->m_renderer;

- // The nearest enclosing layer always paints the float (so that zindex and stacking

- // behaves properly). We always want to propagate the desire to paint the float as

- // far out as we can, to the outermost block that overlaps the float, stopping only

- // if we hit a layer boundary.

- if (r->m_renderer->enclosingLayer() == enclosingLayer())

- r->m_shouldPaint = false;

- else

- floatingObj->m_shouldPaint = false;

- // We create the floating object list lazily.

- if (!m_floatingObjects) {

- m_floatingObjects = new DeprecatedPtrList<FloatingObject>;

- m_floatingObjects->setAutoDelete(true);

- }

- m_floatingObjects->append(floatingObj);

- }

- } else if (makeChildPaintOtherFloats && !r->m_shouldPaint && !r->m_renderer->hasLayer() && r->m_renderer->isDescendantOf(child) && r->m_renderer->enclosingLayer() == child->enclosingLayer())

- // The float is not overhanging from this block, so if it is a descendant of the child, the child should

- // paint it (the other case is that it is intruding into the child), unless it has its own layer or enclosing

- // layer.

- // If makeChildPaintOtherFloats is false, it means that the child must already know about all the floats

- // it should paint.

- r->m_shouldPaint = true;

- if (r->m_shouldPaint && !r->m_renderer->hasLayer()) {

- IntRect floatOverflowRect = r->m_renderer->overflowRect(false);

- floatOverflowRect.move(r->m_left + r->m_renderer->marginLeft(), r->m_top + r->m_renderer->marginTop());

- floatsOverflowRect.unite(floatOverflowRect);

- }

- child->addVisualOverflow(floatsOverflowRect);

- return lowestFloatBottom;

-void RenderBlock::addIntrudingFloats(RenderBlock* prev, int xoff, int yoff)

- // If the parent or previous sibling doesn't have any floats to add, don't bother.

- if (!prev->m_floatingObjects)

- return;

- DeprecatedPtrListIterator<FloatingObject> it(*prev->m_floatingObjects);

- for (FloatingObject *r; (r = it.current()); ++it) {

- if (r->m_bottom > yoff) {

- // The object may already be in our list. Check for it up front to avoid

- // creating duplicate entries.

- FloatingObject* f = 0;

- if (m_floatingObjects) {

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- while ((f = it.current())) {

- if (f->m_renderer == r->m_renderer) break;

- ++it;

- }

- if (!f) {

- FloatingObject *floatingObj = new FloatingObject(r->type());

- floatingObj->m_top = r->m_top - yoff;

- floatingObj->m_bottom = r->m_bottom - yoff;

- floatingObj->m_left = r->m_left - xoff;

- // Applying the child's margin makes no sense in the case where the child was passed in.

- // since his own margin was added already through the subtraction of the |xoff| variable

- // above. |xoff| will equal -flow->marginLeft() in this case, so it's already been taken

- // into account. Only apply this code if |child| is false, since otherwise the left margin

- // will get applied twice.

- if (prev != parent())

- floatingObj->m_left += prev->marginLeft();

- floatingObj->m_left -= marginLeft();

- floatingObj->m_shouldPaint = false; // We are not in the direct inheritance chain for this float. We will never paint it.

- floatingObj->m_width = r->m_width;

- floatingObj->m_renderer = r->m_renderer;

- // We create the floating object list lazily.

- if (!m_floatingObjects) {

- m_floatingObjects = new DeprecatedPtrList<FloatingObject>;

- m_floatingObjects->setAutoDelete(true);

- }

- m_floatingObjects->append(floatingObj);

- }

-bool RenderBlock::avoidsFloats() const

- // Floats can't intrude into our box if we have a non-auto column count or width.

- return RenderBox::avoidsFloats() || !style()->hasAutoColumnCount() || !style()->hasAutoColumnWidth();

-bool RenderBlock::containsFloat(RenderObject* o)

- if (m_floatingObjects) {

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- while (it.current()) {

- if (it.current()->m_renderer == o)

- return true;

- ++it;

- }

- return false;

-void RenderBlock::markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove, bool inLayout)

- setChildNeedsLayout(true, !inLayout);

- if (floatToRemove)

- removeFloatingObject(floatToRemove);

- // Iterate over our children and mark them as needed.

- if (!childrenInline()) {

- for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {

- if (child->isRenderBlock() && !child->isFloatingOrPositioned() &&

- ((floatToRemove ? child->containsFloat(floatToRemove) : child->containsFloats()) || child->shrinkToAvoidFloats()))

- toRenderBlock(child)->markAllDescendantsWithFloatsForLayout(floatToRemove, inLayout);

- }

-int RenderBlock::getClearDelta(RenderBox* child)

- // There is no need to compute clearance if we have no floats.

- if (!containsFloats())

- return 0;

- // At least one float is present. We need to perform the clearance computation.

- bool clearSet = child->style()->clear() != CNONE;

- int bottom = 0;

- switch (child->style()->clear()) {

- case CNONE:

- break;

- case CLEFT:

- bottom = leftBottom();

- break;

- case CRIGHT:

- bottom = rightBottom();

- break;

- case CBOTH:

- bottom = floatBottom();

- break;

- }

- // We also clear floats if we are too big to sit on the same line as a float (and wish to avoid floats by default).

- // FIXME: Note that the remaining space checks aren't quite accurate, since you should be able to clear only some floats (the minimum # needed

- // to fit) and not all (we should be using nextFloatBottomBelow and looping).

- // Do not allow tables to wrap in quirks or even in almost strict mode

- // (ebay on the PLT, finance.yahoo.com in the real world, versiontracker.com forces even almost strict mode not to work)

- int result = clearSet ? max(0, bottom - child->y()) : 0;

- if (!result && child->avoidsFloats() && child->style()->width().isFixed() &&

- child->minPrefWidth() > lineWidth(child->y(), false) && child->minPrefWidth() <= availableWidth() &&

- document()->inStrictMode())

- result = max(0, floatBottom() - child->y());

- return result;

-void RenderBlock::addVisualOverflow(const IntRect& r)

- if (r.isEmpty())

- return;

- m_overflowLeft = min(m_overflowLeft, r.x());

- m_overflowWidth = max(m_overflowWidth, r.right());

- m_overflowTop = min(m_overflowTop, r.y());

- m_overflowHeight = max(m_overflowHeight, r.bottom());

-bool RenderBlock::isPointInOverflowControl(HitTestResult& result, int, int, int, int)

- if (!scrollsOverflow())

- return false;

- return layer()->hitTestOverflowControls(result);

-bool RenderBlock::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction)

- int tx = _tx + x();

- int ty = _ty + y();

- if (!isRenderView()) {

- // Check if we need to do anything at all.

- IntRect overflowBox = overflowRect(false);

- overflowBox.move(tx, ty);

- if (!overflowBox.contains(_x, _y))

- return false;

- }

- if (isPointInOverflowControl(result, _x, _y, tx, ty)) {

- if (hitTestAction == HitTestBlockBackground) {

- updateHitTestResult(result, IntPoint(_x - tx, _y - ty));

- return true;

- }

- return false;

- }

- // If we have lightweight control clipping, then we can't have any spillout.

- if (!hasControlClip() || controlClipRect(tx, ty).contains(_x, _y)) {

- // Hit test descendants first.

- int scrolledX = tx;

- int scrolledY = ty;

- if (hasOverflowClip())

- m_layer->subtractScrolledContentOffset(scrolledX, scrolledY);

- // Hit test contents if we don't have columns.

- if (!hasColumns() && hitTestContents(request, result, _x, _y, scrolledX, scrolledY, hitTestAction))

- return true;

- // Hit test our columns if we do have them.

- if (hasColumns() && hitTestColumns(request, result, _x, _y, scrolledX, scrolledY, hitTestAction))

- return true;

- // Hit test floats.

- if (hitTestAction == HitTestFloat && m_floatingObjects) {

- if (isRenderView()) {

- scrolledX += toRenderView(this)->frameView()->scrollX();

- scrolledY += toRenderView(this)->frameView()->scrollY();

- }

- FloatingObject* o;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for (it.toLast(); (o = it.current()); --it) {

- if (o->m_shouldPaint && !o->m_renderer->hasLayer()) {

- int xoffset = scrolledX + o->m_left + o->m_renderer->marginLeft() - o->m_renderer->x();

- int yoffset = scrolledY + o->m_top + o->m_renderer->marginTop() - o->m_renderer->y();

- if (o->m_renderer->hitTest(request, result, IntPoint(_x, _y), xoffset, yoffset)) {

- updateHitTestResult(result, IntPoint(_x - xoffset, _y - yoffset));

- return true;

- }

- // Now hit test our background

- if (hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) {

- IntRect boundsRect(tx, ty, width(), height());

- if (visibleToHitTesting() && boundsRect.contains(_x, _y)) {

- updateHitTestResult(result, IntPoint(_x - tx, _y - ty));

- return true;

- }

- return false;

-bool RenderBlock::hitTestColumns(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction)

- // We need to do multiple passes, breaking up our hit testing into strips.

- // We can always go left to right, since column contents are clipped (meaning that there

- // can't be any overlap).

- int currXOffset = 0;

- int currYOffset = 0;

- int colGap = columnGap();

- Vector<IntRect>* colRects = columnRects();

- for (unsigned i = 0; i < colRects->size(); i++) {

- IntRect colRect = colRects->at(i);

- colRect.move(tx, ty);

- if (colRect.contains(x, y)) {

- // The point is inside this column.

- // Adjust tx and ty to change where we hit test.

- int finalX = tx + currXOffset;

- int finalY = ty + currYOffset;

- return hitTestContents(request, result, x, y, finalX, finalY, hitTestAction);

- }

- // Move to the next position.

- if (style()->direction() == LTR)

- currXOffset += colRect.width() + colGap;

- else

- currXOffset -= (colRect.width() + colGap);

- currYOffset -= colRect.height();

- }

- return false;

-bool RenderBlock::hitTestContents(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction)

- if (childrenInline() && !isTable()) {

- // We have to hit-test our line boxes.

- if (m_lineBoxes.hitTest(this, request, result, x, y, tx, ty, hitTestAction)) {

- updateHitTestResult(result, IntPoint(x - tx, y - ty));

- return true;

- }

- } else {

- // Hit test our children.

- HitTestAction childHitTest = hitTestAction;

- if (hitTestAction == HitTestChildBlockBackgrounds)

- childHitTest = HitTestChildBlockBackground;

- for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {

- // FIXME: We have to skip over inline flows, since they can show up inside RenderTables at the moment (a demoted inline <form> for example). If we ever implement a

- // table-specific hit-test method (which we should do for performance reasons anyway), then we can remove this check.

- if (!child->hasLayer() && !child->isFloating() && !child->isRenderInline() && child->nodeAtPoint(request, result, x, y, tx, ty, childHitTest)) {

- updateHitTestResult(result, IntPoint(x - tx, y - ty));

- return true;

- }

- return false;

-Position RenderBlock::positionForBox(InlineBox *box, bool start) const

- if (!box)

- return Position();

- if (!box->object()->element())

- return Position(element(), start ? caretMinOffset() : caretMaxOffset());

- if (!box->isInlineTextBox())

- return Position(box->object()->element(), start ? box->object()->caretMinOffset() : box->object()->caretMaxOffset());

- InlineTextBox *textBox = static_cast<InlineTextBox *>(box);

- return Position(box->object()->element(), start ? textBox->start() : textBox->start() + textBox->len());

-Position RenderBlock::positionForRenderer(RenderObject* renderer, bool start) const

- if (!renderer)

- return Position(element(), 0);

- Node* node = renderer->element() ? renderer->element() : element();

- if (!node)

- return Position();

- ASSERT(renderer == node->renderer());

- int offset = start ? renderer->caretMinOffset() : renderer->caretMaxOffset();

- // FIXME: This was a runtime check that seemingly couldn't fail; changed it to an assertion for now.

- ASSERT(!node->isCharacterDataNode() || renderer->isText());

- return Position(node, offset);

-VisiblePosition RenderBlock::positionForCoordinates(int x, int y)

- if (isTable())

- return RenderBox::positionForCoordinates(x, y);

- int top = borderTop();

- int bottom = top + paddingTop() + contentHeight() + paddingBottom();

- int left = borderLeft();

- int right = left + paddingLeft() + contentWidth() + paddingRight();

- Node* n = element();

- int contentsX = x;

- int contentsY = y;

- offsetForContents(contentsX, contentsY);

- if (isReplaced()) {

- if (y < 0 || y < height() && x < 0)

- return VisiblePosition(n, caretMinOffset(), DOWNSTREAM);

- if (y >= height() || y >= 0 && x >= width())

- return VisiblePosition(n, caretMaxOffset(), DOWNSTREAM);

- }

- // If we start inside the shadow tree, we will stay inside (even if the point is above or below).

- if (!(n && n->isShadowNode()) && !childrenInline()) {

- // Don't return positions inside editable roots for coordinates outside those roots, except for coordinates outside

- // a document that is entirely editable.

- bool isEditableRoot = n && n->rootEditableElement() == n && !n->hasTagName(bodyTag) && !n->hasTagName(htmlTag);

- if (y < top || (isEditableRoot && (y < bottom && x < left))) {

- if (!isEditableRoot)

- if (RenderBox* c = firstChildBox()) { // FIXME: This code doesn't make any sense. This child could be an inline or a positioned element or a float, etc.

- VisiblePosition p = c->positionForCoordinates(contentsX - c->x(), contentsY - c->y());

- if (p.isNotNull())

- return p;

- }

- if (n) {

- if (Node* sp = n->shadowParentNode())

- n = sp;

- if (Node* p = n->parent())

- return VisiblePosition(p, n->nodeIndex(), DOWNSTREAM);

- }

- return VisiblePosition(n, 0, DOWNSTREAM);

- }

- if (y >= bottom || (isEditableRoot && (y >= top && x >= right))) {

- if (!isEditableRoot)

- if (RenderBox* c = lastChildBox()) { // FIXME: This code doesn't make any sense. This child could be an inline or a positioned element or a float, etc.

- VisiblePosition p = c->positionForCoordinates(contentsX - c->x(), contentsY - c->y());

- if (p.isNotNull())

- return p;

- }

- if (n) {

- if (Node* sp = n->shadowParentNode())

- n = sp;

- if (Node* p = n->parent())

- return VisiblePosition(p, n->nodeIndex() + 1, DOWNSTREAM);

- }

- return VisiblePosition(n, 0, DOWNSTREAM);

- }

- if (childrenInline()) {

- if (!firstRootBox())

- return VisiblePosition(n, 0, DOWNSTREAM);

- if (contentsY < firstRootBox()->topOverflow() - verticalLineClickFudgeFactor)

- // y coordinate is above first root line box

- return VisiblePosition(positionForBox(firstRootBox()->firstLeafChild(), true), DOWNSTREAM);

- // look for the closest line box in the root box which is at the passed-in y coordinate

- for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) {

- // set the bottom based on whether there is a next root box

- if (root->nextRootBox())

- // FIXME: make the break point halfway between the bottom of the previous root box and the top of the next root box

- bottom = root->nextRootBox()->topOverflow();

- else

- bottom = root->bottomOverflow() + verticalLineClickFudgeFactor;

- // check if this root line box is located at this y coordinate

- if (contentsY < bottom && root->firstChild()) {

- InlineBox* closestBox = root->closestLeafChildForXPos(x);

- if (closestBox)

- // pass the box a y position that is inside it

- return closestBox->object()->positionForCoordinates(contentsX, closestBox->m_y);

- }

- if (lastRootBox())

- // y coordinate is below last root line box

- return VisiblePosition(positionForBox(lastRootBox()->lastLeafChild(), false), DOWNSTREAM);

- return VisiblePosition(n, 0, DOWNSTREAM);

- }

- // See if any child blocks exist at this y coordinate.

- if (firstChildBox() && contentsY < firstChildBox()->y())

- return VisiblePosition(n, 0, DOWNSTREAM);

- for (RenderBox* renderer = firstChildBox(); renderer; renderer = renderer->nextSiblingBox()) {

- if (renderer->height() == 0 || renderer->style()->visibility() != VISIBLE || renderer->isFloatingOrPositioned())

- continue;

- RenderBox* next = renderer->nextSiblingBox();

- while (next && next->isFloatingOrPositioned())

- next = next->nextSiblingBox();

- if (next)

- bottom = next->y();

- else

- bottom = top + scrollHeight();

- if (contentsY >= renderer->y() && contentsY < bottom)

- return renderer->positionForCoordinates(contentsX - renderer->x(), contentsY - renderer->y());

- }

- return RenderBox::positionForCoordinates(x, y);

-void RenderBlock::offsetForContents(int& tx, int& ty) const

- if (hasOverflowClip())

- m_layer->addScrolledContentOffset(tx, ty);

- if (hasColumns()) {

- IntPoint contentsPoint(tx, ty);

- adjustPointToColumnContents(contentsPoint);

- tx = contentsPoint.x();

- ty = contentsPoint.y();

- }

-int RenderBlock::availableWidth() const

- // If we have multiple columns, then the available width is reduced to our column width.

- if (hasColumns())

- return desiredColumnWidth();

- return contentWidth();

-int RenderBlock::columnGap() const

- if (style()->hasNormalColumnGap())

- return style()->fontDescription().computedPixelSize(); // "1em" is recommended as the normal gap setting. Matches <p> margins.

- return static_cast<int>(style()->columnGap());

-void RenderBlock::calcColumnWidth()

- // Calculate our column width and column count.

- unsigned desiredColumnCount = 1;

- int desiredColumnWidth = contentWidth();

- // For now, we don't support multi-column layouts when printing, since we have to do a lot of work for proper pagination.

- if (document()->printing() || (style()->hasAutoColumnCount() && style()->hasAutoColumnWidth())) {

- setDesiredColumnCountAndWidth(desiredColumnCount, desiredColumnWidth);

- return;

- }

- int availWidth = desiredColumnWidth;

- int colGap = columnGap();

- int colWidth = max(1, static_cast<int>(style()->columnWidth()));

- int colCount = max(1, static_cast<int>(style()->columnCount()));

- if (style()->hasAutoColumnWidth()) {

- if ((colCount - 1) * colGap < availWidth) {

- desiredColumnCount = colCount;

- desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;

- } else if (colGap < availWidth) {

- desiredColumnCount = availWidth / colGap;

- desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;

- }

- } else if (style()->hasAutoColumnCount()) {

- if (colWidth < availWidth) {

- desiredColumnCount = (availWidth + colGap) / (colWidth + colGap);

- desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;

- }

- } else {

- // Both are set.

- if (colCount * colWidth + (colCount - 1) * colGap <= availWidth) {

- desiredColumnCount = colCount;

- desiredColumnWidth = colWidth;

- } else if (colWidth < availWidth) {

- desiredColumnCount = (availWidth + colGap) / (colWidth + colGap);

- desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;

- }

- setDesiredColumnCountAndWidth(desiredColumnCount, desiredColumnWidth);

-void RenderBlock::setDesiredColumnCountAndWidth(int count, int width)

- if (count == 1) {

- if (hasColumns()) {

- delete gColumnInfoMap->take(this);

- setHasColumns(false);

- }

- } else {

- ColumnInfo* info;

- if (hasColumns())

- info = gColumnInfoMap->get(this);

- else {

- if (!gColumnInfoMap)

- gColumnInfoMap = new ColumnInfoMap;

- info = new ColumnInfo;

- gColumnInfoMap->add(this, info);

- setHasColumns(true);

- }

- info->m_desiredColumnCount = count;

- info->m_desiredColumnWidth = width;

- }

-int RenderBlock::desiredColumnWidth() const

- if (!hasColumns())

- return contentWidth();

- return gColumnInfoMap->get(this)->m_desiredColumnWidth;

-unsigned RenderBlock::desiredColumnCount() const

- if (!hasColumns())

- return 1;

- return gColumnInfoMap->get(this)->m_desiredColumnCount;

-Vector<IntRect>* RenderBlock::columnRects() const

- if (!hasColumns())

- return 0;

- return &gColumnInfoMap->get(this)->m_columnRects;

-int RenderBlock::layoutColumns(int endOfContent)

- // Don't do anything if we have no columns

- if (!hasColumns())

- return -1;

- ColumnInfo* info = gColumnInfoMap->get(this);

- int desiredColumnWidth = info->m_desiredColumnWidth;

- int desiredColumnCount = info->m_desiredColumnCount;

- Vector<IntRect>* columnRects = &info->m_columnRects;

- bool computeIntrinsicHeight = (endOfContent == -1);

- // Fill the columns in to the available height. Attempt to balance the height of the columns

- int availableHeight = contentHeight();

- int colHeight = computeIntrinsicHeight ? availableHeight / desiredColumnCount : availableHeight;

- // Add in half our line-height to help with best-guess initial balancing.

- int columnSlop = lineHeight(false) / 2;

- int remainingSlopSpace = columnSlop * desiredColumnCount;

- if (computeIntrinsicHeight)

- colHeight += columnSlop;

- int colGap = columnGap();

- // Compute a collection of column rects.

- columnRects->clear();

- // Then we do a simulated "paint" into the column slices and allow the content to slightly adjust our individual column rects.

- // FIXME: We need to take into account layers that are affected by the columns as well here so that they can have an opportunity

- // to adjust column rects also.

- RenderView* v = view();

- int left = borderLeft() + paddingLeft();

- int top = borderTop() + paddingTop();

- int currX = style()->direction() == LTR ? borderLeft() + paddingLeft() : borderLeft() + paddingLeft() + contentWidth() - desiredColumnWidth;

- int currY = top;

- unsigned colCount = desiredColumnCount;

- int maxColBottom = borderTop() + paddingTop();

- int contentBottom = top + availableHeight;

- for (unsigned i = 0; i < colCount; i++) {

- // If we aren't constrained, then the last column can just get all the remaining space.

- if (computeIntrinsicHeight && i == colCount - 1)

- colHeight = availableHeight;

- // This represents the real column position.

- IntRect colRect(currX, top, desiredColumnWidth, colHeight);

- // For the simulated paint, we pretend like everything is in one long strip.

- IntRect pageRect(left, currY, desiredColumnWidth, colHeight);

- v->setPrintRect(pageRect);

- v->setTruncatedAt(currY + colHeight);

- GraphicsContext context((PlatformGraphicsContext*)0);

- RenderObject::PaintInfo paintInfo(&context, pageRect, PaintPhaseForeground, false, 0, 0);

- setHasColumns(false);

- paintObject(paintInfo, 0, 0);

- setHasColumns(true);

- int adjustedBottom = v->bestTruncatedAt();

- if (adjustedBottom <= currY)

- adjustedBottom = currY + colHeight;

- colRect.setHeight(adjustedBottom - currY);

- // Add in the lost space to the subsequent columns.

- // FIXME: This will create a "staircase" effect if there are enough columns, but the effect should be pretty subtle.

- if (computeIntrinsicHeight) {

- int lostSpace = colHeight - colRect.height();

- if (lostSpace > remainingSlopSpace) {

- // Redestribute the space among the remaining columns.

- int spaceToRedistribute = lostSpace - remainingSlopSpace;

- int remainingColumns = colCount - i + 1;

- colHeight += spaceToRedistribute / remainingColumns;

- }

- remainingSlopSpace = max(0, remainingSlopSpace - lostSpace);

- }

- if (style()->direction() == LTR)

- currX += desiredColumnWidth + colGap;

- else

- currX -= (desiredColumnWidth + colGap);

- currY += colRect.height();

- availableHeight -= colRect.height();

- maxColBottom = max(colRect.bottom(), maxColBottom);

- columnRects->append(colRect);

- // Start adding in more columns as long as there's still content left.

- if (currY < endOfContent && i == colCount - 1 && (computeIntrinsicHeight || contentHeight()))

- colCount++;

- }

- m_overflowWidth = max(width(), currX - colGap);

- m_overflowLeft = min(0, currX + desiredColumnWidth + colGap);

- m_overflowHeight = maxColBottom;

- int toAdd = borderBottom() + paddingBottom() + horizontalScrollbarHeight();

- if (computeIntrinsicHeight)

- setHeight(m_overflowHeight + toAdd);

- v->setPrintRect(IntRect());

- v->setTruncatedAt(0);

- ASSERT(colCount == columnRects->size());

- return contentBottom;

-void RenderBlock::adjustPointToColumnContents(IntPoint& point) const

- // Just bail if we have no columns.

- if (!hasColumns())

- return;

- Vector<IntRect>* colRects = columnRects();

- // Determine which columns we intersect.

- int colGap = columnGap();

- int leftGap = colGap / 2;

- IntPoint columnPoint(colRects->at(0).location());

- int yOffset = 0;

- for (unsigned i = 0; i < colRects->size(); i++) {

- // Add in half the column gap to the left and right of the rect.

- IntRect colRect = colRects->at(i);

- IntRect gapAndColumnRect(colRect.x() - leftGap, colRect.y(), colRect.width() + colGap, colRect.height());

- if (gapAndColumnRect.contains(point)) {

- // We're inside the column. Translate the x and y into our column coordinate space.

- point.move(columnPoint.x() - colRect.x(), yOffset);

- return;

- }

- // Move to the next position.

- yOffset += colRect.height();

- }

-void RenderBlock::adjustRectForColumns(IntRect& r) const

- // Just bail if we have no columns.

- if (!hasColumns())

- return;

- Vector<IntRect>* colRects = columnRects();

- // Begin with a result rect that is empty.

- IntRect result;

- // Determine which columns we intersect.

- int currXOffset = 0;

- int currYOffset = 0;

- int colGap = columnGap();

- for (unsigned i = 0; i < colRects->size(); i++) {

- IntRect colRect = colRects->at(i);

- IntRect repaintRect = r;

- repaintRect.move(currXOffset, currYOffset);

- repaintRect.intersect(colRect);

- result.unite(repaintRect);

- // Move to the next position.

- if (style()->direction() == LTR)

- currXOffset += colRect.width() + colGap;

- else

- currXOffset -= (colRect.width() + colGap);

- currYOffset -= colRect.height();

- }

- r = result;

-void RenderBlock::calcPrefWidths()

- ASSERT(prefWidthsDirty());

- updateFirstLetter();

- if (!isTableCell() && style()->width().isFixed() && style()->width().value() > 0)

- m_minPrefWidth = m_maxPrefWidth = calcContentBoxWidth(style()->width().value());

- else {

- m_minPrefWidth = 0;

- m_maxPrefWidth = 0;

- if (childrenInline())

- calcInlinePrefWidths();

- else

- calcBlockPrefWidths();

- m_maxPrefWidth = max(m_minPrefWidth, m_maxPrefWidth);

- if (!style()->autoWrap() && childrenInline()) {

- m_minPrefWidth = m_maxPrefWidth;

- // A horizontal marquee with inline children has no minimum width.

- if (m_layer && m_layer->marquee() && m_layer->marquee()->isHorizontal())

- m_minPrefWidth = 0;

- }

- if (isTableCell()) {

- Length w = static_cast<const RenderTableCell*>(this)->styleOrColWidth();

- if (w.isFixed() && w.value() > 0)

- m_maxPrefWidth = max(m_minPrefWidth, calcContentBoxWidth(w.value()));

- }

- if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) {

- m_maxPrefWidth = max(m_maxPrefWidth, calcContentBoxWidth(style()->minWidth().value()));

- m_minPrefWidth = max(m_minPrefWidth, calcContentBoxWidth(style()->minWidth().value()));

- }

- if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) {

- m_maxPrefWidth = min(m_maxPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));

- m_minPrefWidth = min(m_minPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));

- }

- int toAdd = 0;

- toAdd = borderLeft() + borderRight() + paddingLeft() + paddingRight();

- m_minPrefWidth += toAdd;

- m_maxPrefWidth += toAdd;

- setPrefWidthsDirty(false);

-struct InlineMinMaxIterator

-/* InlineMinMaxIterator is a class that will iterate over all render objects that contribute to

- inline min/max width calculations. Note the following about the way it walks:

- (1) Positioned content is skipped (since it does not contribute to min/max width of a block)

- (2) We do not drill into the children of floats or replaced elements, since you can't break

- in the middle of such an element.

- (3) Inline flows (e.g., <a>, <span>, <i>) are walked twice, since each side can have

- distinct borders/margin/padding that contribute to the min/max width.

-*/

- RenderObject* parent;

- RenderObject* current;

- bool endOfInline;

- InlineMinMaxIterator(RenderObject* p, bool end = false)

- :parent(p), current(p), endOfInline(end) {}

- RenderObject* next();

-};

-RenderObject* InlineMinMaxIterator::next()

- RenderObject* result = 0;

- bool oldEndOfInline = endOfInline;

- endOfInline = false;

- while (current || current == parent) {

- if (!oldEndOfInline &&

- (current == parent ||

- (!current->isFloating() && !current->isReplaced() && !current->isPositioned())))

- result = current->firstChild();

- if (!result) {

- // We hit the end of our inline. (It was empty, e.g., <span></span>.)

- if (!oldEndOfInline && current->isRenderInline()) {

- result = current;

- endOfInline = true;

- break;

- }

- while (current && current != parent) {

- result = current->nextSibling();

- if (result) break;

- current = current->parent();

- if (current && current != parent && current->isRenderInline()) {

- result = current;

- endOfInline = true;

- break;

- }

- if (!result)

- break;

- if (!result->isPositioned() && (result->isText() || result->isFloating() || result->isReplaced() || result->isRenderInline()))

- break;

- current = result;

- result = 0;

- }

- // Update our position.

- current = result;

- return current;

-static int getBPMWidth(int childValue, Length cssUnit)

- if (cssUnit.type() != Auto)

- return (cssUnit.isFixed() ? cssUnit.value() : childValue);

- return 0;

-static int getBorderPaddingMargin(const RenderBox* child, bool endOfInline)

- RenderStyle* cstyle = child->style();

- int result = 0;

- bool leftSide = (cstyle->direction() == LTR) ? !endOfInline : endOfInline;

- result += getBPMWidth((leftSide ? child->marginLeft() : child->marginRight()),

- (leftSide ? cstyle->marginLeft() :

- cstyle->marginRight()));

- result += getBPMWidth((leftSide ? child->paddingLeft() : child->paddingRight()),

- (leftSide ? cstyle->paddingLeft() :

- cstyle->paddingRight()));

- result += leftSide ? child->borderLeft() : child->borderRight();

- return result;

-static inline void stripTrailingSpace(int& inlineMax, int& inlineMin,

- RenderObject* trailingSpaceChild)

- if (trailingSpaceChild && trailingSpaceChild->isText()) {

- // Collapse away the trailing space at the end of a block.

- RenderText* t = toRenderText(trailingSpaceChild);

- const UChar space = ' ';

- const Font& font = t->style()->font(); // FIXME: This ignores first-line.

- int spaceWidth = font.width(TextRun(&space, 1));

- inlineMax -= spaceWidth + font.wordSpacing();

- if (inlineMin > inlineMax)

- inlineMin = inlineMax;

- }

-void RenderBlock::calcInlinePrefWidths()

- int inlineMax = 0;

- int inlineMin = 0;

- int cw = containingBlock()->contentWidth();

- // If we are at the start of a line, we want to ignore all white-space.

- // Also strip spaces if we previously had text that ended in a trailing space.

- bool stripFrontSpaces = true;

- RenderObject* trailingSpaceChild = 0;

- // Firefox and Opera will allow a table cell to grow to fit an image inside it under

- // very specific cirucumstances (in order to match common WinIE renderings).

- // Not supporting the quirk has caused us to mis-render some real sites. (See Bugzilla 10517.)

- bool allowImagesToBreak = !style()->htmlHacks() || !isTableCell() || !style()->width().isIntrinsicOrAuto();

- bool autoWrap, oldAutoWrap;

- autoWrap = oldAutoWrap = style()->autoWrap();

- InlineMinMaxIterator childIterator(this);

- bool addedTextIndent = false; // Only gets added in once.

- RenderObject* prevFloat = 0;

- RenderObject* previousLeaf = 0;

- while (RenderObject* child = childIterator.next()) {

- autoWrap = child->isReplaced() ? child->parent()->style()->autoWrap() :

- child->style()->autoWrap();

- if (!child->isBR()) {

- // Step One: determine whether or not we need to go ahead and

- // terminate our current line. Each discrete chunk can become

- // the new min-width, if it is the widest chunk seen so far, and

- // it can also become the max-width.

- // Children fall into three categories:

- // (1) An inline flow object. These objects always have a min/max of 0,

- // and are included in the iteration solely so that their margins can

- // be added in.

- //

- // (2) An inline non-text non-flow object, e.g., an inline replaced element.

- // These objects can always be on a line by themselves, so in this situation

- // we need to go ahead and break the current line, and then add in our own

- // margins and min/max width on its own line, and then terminate the line.

- //

- // (3) A text object. Text runs can have breakable characters at the start,

- // the middle or the end. They may also lose whitespace off the front if

- // we're already ignoring whitespace. In order to compute accurate min-width

- // information, we need three pieces of information.

- // (a) the min-width of the first non-breakable run. Should be 0 if the text string

- // starts with whitespace.

- // (b) the min-width of the last non-breakable run. Should be 0 if the text string

- // ends with whitespace.

- // (c) the min/max width of the string (trimmed for whitespace).

- //

- // If the text string starts with whitespace, then we need to go ahead and

- // terminate our current line (unless we're already in a whitespace stripping

- // mode.

- //

- // If the text string has a breakable character in the middle, but didn't start

- // with whitespace, then we add the width of the first non-breakable run and

- // then end the current line. We then need to use the intermediate min/max width

- // values (if any of them are larger than our current min/max). We then look at

- // the width of the last non-breakable run and use that to start a new line

- // (unless we end in whitespace).

- RenderStyle* cstyle = child->style();

- int childMin = 0;

- int childMax = 0;

- if (!child->isText()) {

- // Case (1) and (2). Inline replaced and inline flow elements.

- if (child->isRenderInline()) {

- // Add in padding/border/margin from the appropriate side of

- // the element.

- int bpm = getBorderPaddingMargin(static_cast<RenderBox*>(child), childIterator.endOfInline);

- childMin += bpm;

- childMax += bpm;

- inlineMin += childMin;

- inlineMax += childMax;

- child->setPrefWidthsDirty(false);

- } else {

- // Inline replaced elts add in their margins to their min/max values.

- int margins = 0;

- Length leftMargin = cstyle->marginLeft();

- Length rightMargin = cstyle->marginRight();

- if (leftMargin.isFixed())

- margins += leftMargin.value();

- if (rightMargin.isFixed())

- margins += rightMargin.value();

- childMin += margins;

- childMax += margins;

- }

- if (!child->isRenderInline() && !child->isText()) {

- // Case (2). Inline replaced elements and floats.

- // Go ahead and terminate the current line as far as

- // minwidth is concerned.

- childMin += child->minPrefWidth();

- childMax += child->maxPrefWidth();

- bool clearPreviousFloat;

- if (child->isFloating()) {

- clearPreviousFloat = (prevFloat

- && (prevFloat->style()->floating() == FLEFT && (child->style()->clear() & CLEFT)

- || prevFloat->style()->floating() == FRIGHT && (child->style()->clear() & CRIGHT)));

- prevFloat = child;

- } else

- clearPreviousFloat = false;

- bool canBreakReplacedElement = !child->isImage() || allowImagesToBreak;

- if (canBreakReplacedElement && (autoWrap || oldAutoWrap) || clearPreviousFloat) {

- m_minPrefWidth = max(inlineMin, m_minPrefWidth);

- inlineMin = 0;

- }

- // If we're supposed to clear the previous float, then terminate maxwidth as well.

- if (clearPreviousFloat) {

- m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);

- inlineMax = 0;

- }

- // Add in text-indent. This is added in only once.

- int ti = 0;

- if (!addedTextIndent) {

- addedTextIndent = true;

- ti = style()->textIndent().calcMinValue(cw);

- childMin+=ti;

- childMax+=ti;

- }

- // Add our width to the max.

- inlineMax += childMax;

- if (!autoWrap || !canBreakReplacedElement) {

- if (child->isFloating())

- m_minPrefWidth = max(childMin, m_minPrefWidth);

- else

- inlineMin += childMin;

- } else {

- // Now check our line.

- m_minPrefWidth = max(childMin, m_minPrefWidth);

- // Now start a new line.

- inlineMin = 0;

- }

- // We are no longer stripping whitespace at the start of

- // a line.

- if (!child->isFloating()) {

- stripFrontSpaces = false;

- trailingSpaceChild = 0;

- }

- } else if (child->isText()) {

- // Case (3). Text.

- RenderText* t = toRenderText(child);

- if (t->isWordBreak()) {

- m_minPrefWidth = max(inlineMin, m_minPrefWidth);

- inlineMin = 0;

- continue;

- }

- // Determine if we have a breakable character. Pass in

- // whether or not we should ignore any spaces at the front

- // of the string. If those are going to be stripped out,

- // then they shouldn't be considered in the breakable char

- // check.

- bool hasBreakableChar, hasBreak;

- int beginMin, endMin;

- bool beginWS, endWS;

- int beginMax, endMax;

- t->trimmedPrefWidths(inlineMax, beginMin, beginWS, endMin, endWS,

- hasBreakableChar, hasBreak, beginMax, endMax,

- childMin, childMax, stripFrontSpaces);

- // This text object will not be rendered, but it may still provide a breaking opportunity.

- if (!hasBreak && childMax == 0) {

- if (autoWrap && (beginWS || endWS)) {

- m_minPrefWidth = max(inlineMin, m_minPrefWidth);

- inlineMin = 0;

- }

- continue;

- }

- if (stripFrontSpaces)

- trailingSpaceChild = child;

- else

- trailingSpaceChild = 0;

- // Add in text-indent. This is added in only once.

- int ti = 0;

- if (!addedTextIndent) {

- addedTextIndent = true;

- ti = style()->textIndent().calcMinValue(cw);

- childMin+=ti; beginMin += ti;

- childMax+=ti; beginMax += ti;

- }

- // If we have no breakable characters at all,

- // then this is the easy case. We add ourselves to the current

- // min and max and continue.

- if (!hasBreakableChar) {

- inlineMin += childMin;

- } else {

- // We have a breakable character. Now we need to know if

- // we start and end with whitespace.

- if (beginWS)

- // Go ahead and end the current line.

- m_minPrefWidth = max(inlineMin, m_minPrefWidth);

- else {

- inlineMin += beginMin;

- m_minPrefWidth = max(inlineMin, m_minPrefWidth);

- childMin -= ti;

- }

- inlineMin = childMin;

- if (endWS) {

- // We end in whitespace, which means we can go ahead

- // and end our current line.

- m_minPrefWidth = max(inlineMin, m_minPrefWidth);

- inlineMin = 0;

- } else {

- m_minPrefWidth = max(inlineMin, m_minPrefWidth);

- inlineMin = endMin;

- }

- if (hasBreak) {

- inlineMax += beginMax;

- m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);

- m_maxPrefWidth = max(childMax, m_maxPrefWidth);

- inlineMax = endMax;

- } else

- inlineMax += childMax;

- }

- } else {

- m_minPrefWidth = max(inlineMin, m_minPrefWidth);

- m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);

- inlineMin = inlineMax = 0;

- stripFrontSpaces = true;

- trailingSpaceChild = 0;

- }

- oldAutoWrap = autoWrap;

- if (!child->isRenderInline())

- previousLeaf = child;

- }

- if (style()->collapseWhiteSpace())

- stripTrailingSpace(inlineMax, inlineMin, trailingSpaceChild);

- m_minPrefWidth = max(inlineMin, m_minPrefWidth);

- m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);

-// Use a very large value (in effect infinite).

-#define BLOCK_MAX_WIDTH 15000

-void RenderBlock::calcBlockPrefWidths()

- bool nowrap = style()->whiteSpace() == NOWRAP;

- RenderObject *child = firstChild();

- int floatLeftWidth = 0, floatRightWidth = 0;

- while (child) {

- // Positioned children don't affect the min/max width

- if (child->isPositioned()) {

- child = child->nextSibling();

- continue;

- }

- if (child->isFloating() || child->avoidsFloats()) {

- int floatTotalWidth = floatLeftWidth + floatRightWidth;

- if (child->style()->clear() & CLEFT) {

- m_maxPrefWidth = max(floatTotalWidth, m_maxPrefWidth);

- floatLeftWidth = 0;

- }

- if (child->style()->clear() & CRIGHT) {

- m_maxPrefWidth = max(floatTotalWidth, m_maxPrefWidth);

- floatRightWidth = 0;

- }

- // A margin basically has three types: fixed, percentage, and auto (variable).

- // Auto and percentage margins simply become 0 when computing min/max width.

- // Fixed margins can be added in as is.

- Length ml = child->style()->marginLeft();

- Length mr = child->style()->marginRight();

- int margin = 0, marginLeft = 0, marginRight = 0;

- if (ml.isFixed())

- marginLeft += ml.value();

- if (mr.isFixed())

- marginRight += mr.value();

- margin = marginLeft + marginRight;

- int w = child->minPrefWidth() + margin;

- m_minPrefWidth = max(w, m_minPrefWidth);

- // IE ignores tables for calculation of nowrap. Makes some sense.

- if (nowrap && !child->isTable())

- m_maxPrefWidth = max(w, m_maxPrefWidth);

- w = child->maxPrefWidth() + margin;

- if (!child->isFloating()) {

- if (child->avoidsFloats()) {

- // Determine a left and right max value based off whether or not the floats can fit in the

- // margins of the object. For negative margins, we will attempt to overlap the float if the negative margin

- // is smaller than the float width.

- int maxLeft = marginLeft > 0 ? max(floatLeftWidth, marginLeft) : floatLeftWidth + marginLeft;

- int maxRight = marginRight > 0 ? max(floatRightWidth, marginRight) : floatRightWidth + marginRight;

- w = child->maxPrefWidth() + maxLeft + maxRight;

- w = max(w, floatLeftWidth + floatRightWidth);

- }

- else

- m_maxPrefWidth = max(floatLeftWidth + floatRightWidth, m_maxPrefWidth);

- floatLeftWidth = floatRightWidth = 0;

- }

- if (child->isFloating()) {

- if (style()->floating() == FLEFT)

- floatLeftWidth += w;

- else

- floatRightWidth += w;

- } else

- m_maxPrefWidth = max(w, m_maxPrefWidth);

- // A very specific WinIE quirk.

- // Example:

- /*

- <div style="position:absolute; width:100px; top:50px;">

- <div style="position:absolute;left:0px;top:50px;height:50px;background-color:green">

- <table style="width:100%"><tr><td></table>

- </div>

- */

- // In the above example, the inner absolute positioned block should have a computed width

- // of 100px because of the table.

- // We can achieve this effect by making the maxwidth of blocks that contain tables

- // with percentage widths be infinite (as long as they are not inside a table cell).

- if (style()->htmlHacks() && child->style()->width().isPercent() &&

- !isTableCell() && child->isTable() && m_maxPrefWidth < BLOCK_MAX_WIDTH) {

- RenderBlock* cb = containingBlock();

- while (!cb->isRenderView() && !cb->isTableCell())

- cb = cb->containingBlock();

- if (!cb->isTableCell())

- m_maxPrefWidth = BLOCK_MAX_WIDTH;

- }

- child = child->nextSibling();

- }

- // Always make sure these values are non-negative.

- m_minPrefWidth = max(0, m_minPrefWidth);

- m_maxPrefWidth = max(0, m_maxPrefWidth);

- m_maxPrefWidth = max(floatLeftWidth + floatRightWidth, m_maxPrefWidth);

-bool RenderBlock::hasLineIfEmpty() const

- if (!element())

- return false;

- if (element()->isContentEditable() && element()->rootEditableElement() == element())

- return true;

- // TODO(ojan): Upstream the change below as part of upstreaming the RenderTextControl changes

- // To put the overflow on the HTMLTextAreaElement instead of it's shadow node.

- if (element()->isShadowNode() &&

- (element()->shadowParentNode()->hasTagName(inputTag) ||

- element()->shadowParentNode()->hasTagName(textareaTag)))

- return true;

- return false;

-int RenderBlock::lineHeight(bool firstLine, bool isRootLineBox) const

- // Inline blocks are replaced elements. Otherwise, just pass off to

- // the base class. If we're being queried as though we're the root line

- // box, then the fact that we're an inline-block is irrelevant, and we behave

- // just like a block.

- if (isReplaced() && !isRootLineBox)

- return height() + marginTop() + marginBottom();

- if (firstLine && document()->usesFirstLineRules()) {

- RenderStyle* s = style(firstLine);

- if (s != style())

- return s->computedLineHeight();

- }

- if (m_lineHeight == -1)

- m_lineHeight = style()->computedLineHeight();

- return m_lineHeight;

-int RenderBlock::baselinePosition(bool b, bool isRootLineBox) const

- // Inline blocks are replaced elements. Otherwise, just pass off to

- // the base class. If we're being queried as though we're the root line

- // box, then the fact that we're an inline-block is irrelevant, and we behave

- // just like a block.

- if (isReplaced() && !isRootLineBox) {

- // For "leaf" theme objects, let the theme decide what the baseline position is.

- // FIXME: Might be better to have a custom CSS property instead, so that if the theme

- // is turned off, checkboxes/radios will still have decent baselines.

- if (style()->hasAppearance() && !theme()->isControlContainer(style()->appearance()))

- return theme()->baselinePosition(this);

- // CSS2.1 states that the baseline of an inline block is the baseline of the last line box in

- // the normal flow. We make an exception for marquees, since their baselines are meaningless

- // (the content inside them moves). This matches WinIE as well, which just bottom-aligns them.

- // We also give up on finding a baseline if we have a vertical scrollbar, or if we are scrolled

- // vertically (e.g., an overflow:hidden block that has had scrollTop moved) or if the baseline is outside

- // of our content box.

- int baselinePos = (m_layer && (m_layer->marquee() || m_layer->verticalScrollbar() || m_layer->scrollYOffset() != 0)) ? -1 : getBaselineOfLastLineBox();

- if (baselinePos != -1 && baselinePos <= borderTop() + paddingTop() + contentHeight())

- return marginTop() + baselinePos;

- return height() + marginTop() + marginBottom();

- }

- return RenderBox::baselinePosition(b, isRootLineBox);

-int RenderBlock::getBaselineOfFirstLineBox() const

- if (!isBlockFlow())

- return RenderBox::getBaselineOfFirstLineBox();

- if (childrenInline()) {

- if (firstLineBox())

- return firstLineBox()->yPos() + firstLineBox()->baseline();

- else

- return -1;

- }

- else {

- for (RenderBox* curr = firstChildBox(); curr; curr = curr->nextSiblingBox()) {

- if (!curr->isFloatingOrPositioned()) {

- int result = curr->getBaselineOfFirstLineBox();

- if (result != -1)

- return curr->y() + result; // Translate to our coordinate space.

- }

- return -1;

-int RenderBlock::getBaselineOfLastLineBox() const

- if (!isBlockFlow())

- return RenderBox::getBaselineOfLastLineBox();

- if (childrenInline()) {

- if (!firstLineBox() && hasLineIfEmpty())

- return RenderBox::baselinePosition(true, true) + borderTop() + paddingTop();

- if (lastLineBox())

- return lastLineBox()->yPos() + lastLineBox()->baseline();

- return -1;

- }

- else {

- bool haveNormalFlowChild = false;

- for (RenderBox* curr = lastChildBox(); curr; curr = curr->previousSiblingBox()) {

- if (!curr->isFloatingOrPositioned()) {

- haveNormalFlowChild = true;

- int result = curr->getBaselineOfLastLineBox();

- if (result != -1)

- return curr->y() + result; // Translate to our coordinate space.

- }

- if (!haveNormalFlowChild && hasLineIfEmpty())

- return RenderBox::baselinePosition(true, true) + borderTop() + paddingTop();

- }

- return -1;

-bool RenderBlock::containsNonZeroBidiLevel() const

- for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) {

- for (InlineBox* box = root->firstLeafChild(); box; box = box->nextLeafChild()) {

- if (box->bidiLevel())

- return true;

- }

- return false;

-RenderBlock* RenderBlock::firstLineBlock() const

- RenderBlock* firstLineBlock = const_cast<RenderBlock*>(this);

- bool hasPseudo = false;

- while (true) {

- hasPseudo = firstLineBlock->style()->hasPseudoStyle(FIRST_LINE);

- if (hasPseudo)

- break;

- RenderObject* parentBlock = firstLineBlock->parent();

- if (firstLineBlock->isReplaced() || firstLineBlock->isFloating() ||

- !parentBlock || parentBlock->firstChild() != firstLineBlock || !parentBlock->isBlockFlow())

- break;

- ASSERT(parentBlock->isRenderBlock());

- firstLineBlock = toRenderBlock(parentBlock);

- }

- if (!hasPseudo)

- return 0;

- return firstLineBlock;

-void RenderBlock::updateFirstLetter()

- if (!document()->usesFirstLetterRules())

- return;

- // Don't recurse

- if (style()->styleType() == FIRST_LETTER)

- return;

- // FIXME: We need to destroy the first-letter object if it is no longer the first child. Need to find

- // an efficient way to check for that situation though before implementing anything.

- RenderObject* firstLetterBlock = this;

- bool hasPseudoStyle = false;

- while (true) {

- // We only honor first-letter if the firstLetterBlock can have children in the DOM. This correctly

- // prevents form controls from honoring first-letter.

- hasPseudoStyle = firstLetterBlock->style()->hasPseudoStyle(FIRST_LETTER)

- && firstLetterBlock->canHaveChildren();

- if (hasPseudoStyle)

- break;

- RenderObject* parentBlock = firstLetterBlock->parent();

- if (firstLetterBlock->isReplaced() || !parentBlock || parentBlock->firstChild() != firstLetterBlock ||

- !parentBlock->isBlockFlow())

- break;

- firstLetterBlock = parentBlock;

- }

- if (!hasPseudoStyle)

- return;

- // Drill into inlines looking for our first text child.

- RenderObject* currChild = firstLetterBlock->firstChild();

- while (currChild && currChild->needsLayout() && (!currChild->isReplaced() || currChild->isFloatingOrPositioned()) && !currChild->isText()) {

- if (currChild->isFloatingOrPositioned()) {

- if (currChild->style()->styleType() == FIRST_LETTER)

- break;

- currChild = currChild->nextSibling();

- } else

- currChild = currChild->firstChild();

- }

- // Get list markers out of the way.

- while (currChild && currChild->isListMarker())

- currChild = currChild->nextSibling();

- if (!currChild)

- return;

- RenderObject* firstLetterContainer = currChild->parent();

- // If the child already has style, then it has already been created, so we just want

- // to update it.

- if (currChild->style()->styleType() == FIRST_LETTER) {

- RenderStyle* pseudo = firstLetterBlock->getCachedPseudoStyle(FIRST_LETTER,

- firstLetterContainer->firstLineStyle());

- currChild->setStyle(pseudo);

- for (RenderObject* genChild = currChild->firstChild(); genChild; genChild = genChild->nextSibling()) {

- if (genChild->isText())

- genChild->setStyle(pseudo);

- }

- return;

- }

- // If the child does not already have style, we create it here.

- if (currChild->isText() && !currChild->isBR() && currChild->parent()->style()->styleType() != FIRST_LETTER) {

- // Our layout state is not valid for the repaints we are going to trigger by

- // adding and removing children of firstLetterContainer.

- view()->disableLayoutState();

- RenderText* textObj = toRenderText(currChild);

- // Create our pseudo style now that we have our firstLetterContainer determined.

- RenderStyle* pseudoStyle = firstLetterBlock->getCachedPseudoStyle(FIRST_LETTER,

- firstLetterContainer->firstLineStyle());

- // Force inline display (except for floating first-letters)

- pseudoStyle->setDisplay(pseudoStyle->isFloating() ? BLOCK : INLINE);

- pseudoStyle->setPosition(StaticPosition); // CSS2 says first-letter can't be positioned.

- RenderObject* firstLetter = 0;

- if (pseudoStyle->display() == INLINE)

- firstLetter = new (renderArena()) RenderInline(document());

- else

- firstLetter = new (renderArena()) RenderBlock(document());

- firstLetter->setStyle(pseudoStyle);

- firstLetterContainer->addChild(firstLetter, currChild);

- // The original string is going to be either a generated content string or a DOM node's

- // string. We want the original string before it got transformed in case first-letter has

- // no text-transform or a different text-transform applied to it.

- RefPtr<StringImpl> oldText = textObj->originalText();

- ASSERT(oldText);

- if (oldText && oldText->length() > 0) {

- unsigned int length = 0;

- // account for leading spaces and punctuation

- while (length < oldText->length() && (isSpaceOrNewline((*oldText)[length]) || Unicode::isPunct((*oldText)[length])))

- length++;

- // account for first letter

- length++;

- // construct text fragment for the text after the first letter

- // NOTE: this might empty

- RenderTextFragment* remainingText =

- new (renderArena()) RenderTextFragment(textObj->node(), oldText.get(), length, oldText->length() - length);

- remainingText->setStyle(textObj->style());

- if (remainingText->element())

- remainingText->element()->setRenderer(remainingText);

- RenderObject* nextObj = textObj->nextSibling();

- firstLetterContainer->removeChild(textObj);

- firstLetterContainer->addChild(remainingText, nextObj);

- remainingText->setFirstLetter(firstLetter);

- // construct text fragment for the first letter

- RenderTextFragment* letter =

- new (renderArena()) RenderTextFragment(remainingText->node(), oldText.get(), 0, length);

- RefPtr<RenderStyle> newStyle = RenderStyle::create();

- newStyle->inheritFrom(pseudoStyle);

- letter->setStyle(newStyle.release());

- firstLetter->addChild(letter);

- textObj->destroy();

- }

- view()->enableLayoutState();

- }

-bool RenderBlock::inRootBlockContext() const

- if (isTableCell() || isFloatingOrPositioned() || hasOverflowClip())

- return false;

- if (isRoot() || isRenderView())

- return true;

- return containingBlock()->inRootBlockContext();

-// Helper methods for obtaining the last line, computing line counts and heights for line counts

-// (crawling into blocks).

-static bool shouldCheckLines(RenderObject* obj)

- return !obj->isFloatingOrPositioned() && !obj->isRunIn() &&

- obj->isBlockFlow() && obj->style()->height().isAuto() &&

- (!obj->isFlexibleBox() || obj->style()->boxOrient() == VERTICAL);

-static RootInlineBox* getLineAtIndex(RenderBlock* block, int i, int& count)

- if (block->style()->visibility() == VISIBLE) {

- if (block->childrenInline()) {

- for (RootInlineBox* box = block->firstRootBox(); box; box = box->nextRootBox()) {

- if (count++ == i)

- return box;

- }

- else {

- for (RenderObject* obj = block->firstChild(); obj; obj = obj->nextSibling()) {

- if (shouldCheckLines(obj)) {

- RootInlineBox *box = getLineAtIndex(toRenderBlock(obj), i, count);

- if (box)

- return box;

- }

- return 0;

-static int getHeightForLineCount(RenderBlock* block, int l, bool includeBottom, int& count)

- if (block->style()->visibility() == VISIBLE) {

- if (block->childrenInline()) {

- for (RootInlineBox* box = block->firstRootBox(); box; box = box->nextRootBox()) {

- if (++count == l)

- return box->bottomOverflow() + (includeBottom ? (block->borderBottom() + block->paddingBottom()) : 0);

- }

- else {

- RenderBox* normalFlowChildWithoutLines = 0;

- for (RenderBox* obj = block->firstChildBox(); obj; obj = obj->nextSiblingBox()) {

- if (shouldCheckLines(obj)) {

- int result = getHeightForLineCount(toRenderBlock(obj), l, false, count);

- if (result != -1)

- return result + obj->y() + (includeBottom ? (block->borderBottom() + block->paddingBottom()) : 0);

- }

- else if (!obj->isFloatingOrPositioned() && !obj->isRunIn())

- normalFlowChildWithoutLines = obj;

- }

- if (normalFlowChildWithoutLines && l == 0)

- return normalFlowChildWithoutLines->y() + normalFlowChildWithoutLines->height();

- }

- return -1;

-RootInlineBox* RenderBlock::lineAtIndex(int i)

- int count = 0;

- return getLineAtIndex(this, i, count);

-int RenderBlock::lineCount()

- int count = 0;

- if (style()->visibility() == VISIBLE) {

- if (childrenInline())

- for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox())

- count++;

- else

- for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling())

- if (shouldCheckLines(obj))

- count += toRenderBlock(obj)->lineCount();

- }

- return count;

-int RenderBlock::heightForLineCount(int l)

- int count = 0;

- return getHeightForLineCount(this, l, true, count);

-void RenderBlock::adjustForBorderFit(int x, int& left, int& right) const

- // We don't deal with relative positioning. Our assumption is that you shrink to fit the lines without accounting

- // for either overflow or translations via relative positioning.

- if (style()->visibility() == VISIBLE) {

- if (childrenInline()) {

- for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox()) {

- if (box->firstChild())

- left = min(left, x + box->firstChild()->xPos());

- if (box->lastChild())

- right = max(right, x + box->lastChild()->xPos() + box->lastChild()->width());

- }

- else {

- for (RenderBox* obj = firstChildBox(); obj; obj = obj->nextSiblingBox()) {

- if (!obj->isFloatingOrPositioned()) {

- if (obj->isBlockFlow() && !obj->hasOverflowClip())

- toRenderBlock(obj)->adjustForBorderFit(x + obj->x(), left, right);

- else if (obj->style()->visibility() == VISIBLE) {

- // We are a replaced element or some kind of non-block-flow object.

- left = min(left, x + obj->x());

- right = max(right, x + obj->x() + obj->width());

- }

- if (m_floatingObjects) {

- FloatingObject* r;

- DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

- for (; (r = it.current()); ++it) {

- // Only examine the object if our m_shouldPaint flag is set.

- if (r->m_shouldPaint) {

- int floatLeft = r->m_left - r->m_renderer->x() + r->m_renderer->marginLeft();

- int floatRight = floatLeft + r->m_renderer->width();

- left = min(left, floatLeft);

- right = max(right, floatRight);

- }

-void RenderBlock::borderFitAdjust(int& x, int& w) const

- if (style()->borderFit() == BorderFitBorder)

- return;

- // Walk any normal flow lines to snugly fit.

- int left = INT_MAX;

- int right = INT_MIN;

- int oldWidth = w;

- adjustForBorderFit(0, left, right);

- if (left != INT_MAX) {

- left -= (borderLeft() + paddingLeft());

- if (left > 0) {

- x += left;

- w -= left;

- }

- if (right != INT_MIN) {

- right += (borderRight() + paddingRight());

- if (right < oldWidth)

- w -= (oldWidth - right);

- }

-void RenderBlock::clearTruncation()

- if (style()->visibility() == VISIBLE) {

- if (childrenInline() && hasMarkupTruncation()) {

- setHasMarkupTruncation(false);

- for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox())

- box->clearTruncation();

- }

- else

- for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling())

- if (shouldCheckLines(obj))

- toRenderBlock(obj)->clearTruncation();

- }

-void RenderBlock::setMaxTopMargins(int pos, int neg)

- if (!m_maxMargin) {

- if (pos == MaxMargin::topPosDefault(this) && neg == MaxMargin::topNegDefault(this))

- return;

- m_maxMargin = new MaxMargin(this);

- }

- m_maxMargin->m_topPos = pos;

- m_maxMargin->m_topNeg = neg;

-void RenderBlock::setMaxBottomMargins(int pos, int neg)

- if (!m_maxMargin) {

- if (pos == MaxMargin::bottomPosDefault(this) && neg == MaxMargin::bottomNegDefault(this))

- return;

- m_maxMargin = new MaxMargin(this);

- }

- m_maxMargin->m_bottomPos = pos;

- m_maxMargin->m_bottomNeg = neg;

-void RenderBlock::absoluteRects(Vector<IntRect>& rects, int tx, int ty, bool topLevel)

- // For blocks inside inlines, we go ahead and include margins so that we run right up to the

- // inline boxes above and below us (thus getting merged with them to form a single irregular

- // shape).

- if (topLevel && inlineContinuation()) {

- rects.append(IntRect(tx, ty - collapsedMarginTop(),

- width(), height() + collapsedMarginTop() + collapsedMarginBottom()));

- inlineContinuation()->absoluteRects(rects,

- tx - x() + inlineContinuation()->containingBlock()->x(),

- ty - y() + inlineContinuation()->containingBlock()->y(), topLevel);

- } else

- rects.append(IntRect(tx, ty, width(), height()));

-void RenderBlock::absoluteQuads(Vector<FloatQuad>& quads, bool topLevel)

- // For blocks inside inlines, we go ahead and include margins so that we run right up to the

- // inline boxes above and below us (thus getting merged with them to form a single irregular

- // shape).

- if (topLevel && inlineContinuation()) {

- FloatRect localRect(0, -collapsedMarginTop(),

- width(), height() + collapsedMarginTop() + collapsedMarginBottom());

- quads.append(localToAbsoluteQuad(localRect));

- inlineContinuation()->absoluteQuads(quads, topLevel);

- } else

- quads.append(RenderBox::localToAbsoluteQuad(FloatRect(0, 0, width(), height())));

-IntRect RenderBlock::rectWithOutlineForRepaint(RenderBox* repaintContainer, int outlineWidth)

- IntRect r(RenderBox::rectWithOutlineForRepaint(repaintContainer, outlineWidth));

- if (inlineContinuation())

- r.inflateY(collapsedMarginTop());

- return r;

-RenderObject* RenderBlock::hoverAncestor() const

- return inlineContinuation() ? inlineContinuation() : RenderBox::hoverAncestor();

-void RenderBlock::updateDragState(bool dragOn)

- RenderBox::updateDragState(dragOn);

- if (inlineContinuation())

- inlineContinuation()->updateDragState(dragOn);

-RenderStyle* RenderBlock::outlineStyleForRepaint() const

- return inlineContinuation() ? inlineContinuation()->style() : style();

-void RenderBlock::childBecameNonInline(RenderObject*)

- makeChildrenNonInline();

- if (isAnonymousBlock() && parent() && parent()->isRenderBlock())

- toRenderBlock(parent())->removeLeftoverAnonymousBlock(this);

- // |this| may be dead here

-void RenderBlock::updateHitTestResult(HitTestResult& result, const IntPoint& point)

- if (result.innerNode())

- return;

- Node* node = element();

- if (inlineContinuation())

- // We are in the margins of block elements that are part of a continuation. In

- // this case we're actually still inside the enclosing inline element that was

- // split. Go ahead and set our inner node accordingly.

- node = inlineContinuation()->element();

- if (node) {

- result.setInnerNode(node);

- if (!result.innerNonSharedNode())

- result.setInnerNonSharedNode(node);

- result.setLocalPoint(point);

- }

-IntRect RenderBlock::localCaretRect(InlineBox* inlineBox, int caretOffset, int* extraWidthToEndOfLine)

- // Do the normal calculation in most cases.

- if (firstChild())

- return RenderBox::localCaretRect(inlineBox, caretOffset, extraWidthToEndOfLine);

- // This is a special case:

- // The element is not an inline element, and it's empty. So we have to

- // calculate a fake position to indicate where objects are to be inserted.

- // FIXME: This does not take into account either :first-line or :first-letter

- // However, as soon as some content is entered, the line boxes will be

- // constructed and this kludge is not called any more. So only the caret size

- // of an empty :first-line'd block is wrong. I think we can live with that.

- RenderStyle* currentStyle = firstLineStyle();

- int height = lineHeight(true);

- const int caretWidth = 1;

- enum CaretAlignment { alignLeft, alignRight, alignCenter };

- CaretAlignment alignment = alignLeft;

- switch (currentStyle->textAlign()) {

- case TAAUTO:

- case JUSTIFY:

- if (currentStyle->direction() == RTL)

- alignment = alignRight;

- break;

- case LEFT:

- case WEBKIT_LEFT:

- break;

- case CENTER:

- case WEBKIT_CENTER:

- alignment = alignCenter;

- break;

- case RIGHT:

- case WEBKIT_RIGHT:

- alignment = alignRight;

- break;

- }

- int x = borderLeft() + paddingLeft();

- int w = width();

- switch (alignment) {

- case alignLeft:

- break;

- case alignCenter:

- x = (x + w - (borderRight() + paddingRight())) / 2;

- break;

- case alignRight:

- x = w - (borderRight() + paddingRight());

- break;

- }

- if (extraWidthToEndOfLine) {

- if (isRenderBlock()) {

- *extraWidthToEndOfLine = w - (x + caretWidth);

- } else {

- // FIXME: This code looks wrong.

- // myRight and containerRight are set up, but then clobbered.

- // So *extraWidthToEndOfLine will always be 0 here.

- int myRight = x + caretWidth;

- // FIXME: why call localToAbsoluteForContent() twice here, too?

- FloatPoint absRightPoint = localToAbsolute(FloatPoint(myRight, 0));

- int containerRight = containingBlock()->x() + containingBlockWidth();

- FloatPoint absContainerPoint = localToAbsolute(FloatPoint(containerRight, 0));

- *extraWidthToEndOfLine = absContainerPoint.x() - absRightPoint.x();

- }

- int y = paddingTop() + borderTop();

- return IntRect(x, y, caretWidth, height);

-void RenderBlock::addFocusRingRects(GraphicsContext* graphicsContext, int tx, int ty)

- // For blocks inside inlines, we go ahead and include margins so that we run right up to the

- // inline boxes above and below us (thus getting merged with them to form a single irregular

- // shape).

- if (inlineContinuation()) {

- // FIXME: This check really isn't accurate.

- bool nextInlineHasLineBox = inlineContinuation()->firstLineBox();

- // FIXME: This is wrong. The principal renderer may not be the continuation preceding this block.

- bool prevInlineHasLineBox = toRenderInline(inlineContinuation()->element()->renderer())->firstLineBox();

- int topMargin = prevInlineHasLineBox ? collapsedMarginTop() : 0;

- int bottomMargin = nextInlineHasLineBox ? collapsedMarginBottom() : 0;

- graphicsContext->addFocusRingRect(IntRect(tx, ty - topMargin,

- width(), height() + topMargin + bottomMargin));

- } else

- graphicsContext->addFocusRingRect(IntRect(tx, ty, width(), height()));

- if (!hasOverflowClip() && !hasControlClip()) {

- for (InlineRunBox* curr = firstLineBox(); curr; curr = curr->nextLineBox())

- graphicsContext->addFocusRingRect(IntRect(tx + curr->xPos(), ty + curr->yPos(), curr->width(), curr->height()));

- for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling()) {

- if (!curr->isText() && !curr->isListMarker() && curr->isBox()) {

- RenderBox* box = toRenderBox(curr);

- FloatPoint pos;

- // FIXME: This doesn't work correctly with transforms.

- if (box->layer())

- pos = curr->localToAbsolute();

- else

- pos = FloatPoint(tx + box->x(), ty + box->y());

- box->addFocusRingRects(graphicsContext, pos.x(), pos.y());

- }

- if (inlineContinuation())

- inlineContinuation()->addFocusRingRects(graphicsContext,

- tx - x() + inlineContinuation()->containingBlock()->x(),

- ty - y() + inlineContinuation()->containingBlock()->y());

-const char* RenderBlock::renderName() const

- if (isBody())

- return "RenderBody"; // FIXME: Temporary hack until we know that the regression tests pass.

- if (isFloating())

- return "RenderBlock (floating)";

- if (isPositioned())

- return "RenderBlock (positioned)";

- if (isAnonymousBlock())

- return "RenderBlock (anonymous)";

- else if (isAnonymous())

- return "RenderBlock (generated)";

- if (isRelPositioned())

- return "RenderBlock (relative positioned)";

- if (isRunIn())

- return "RenderBlock (run-in)";

- return "RenderBlock";

-} // namespace WebCore

+/*

+ *

+ * This library is free software; you can redistribute it and/or

+ * modify it under the terms of the GNU Library General Public

+ * License as published by the Free Software Foundation; either

+ * version 2 of the License, or (at your option) any later version.

+ *

+ * This library is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

+ * Library General Public License for more details.

+ *

+ * You should have received a copy of the GNU Library General Public License

+ * along with this library; see the file COPYING.LIB. If not, write to

+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

+ * Boston, MA 02110-1301, USA.

+ */

+#include "config.h"

+#include "RenderBlock.h"

+#include "Document.h"

+#include "Element.h"

+#include "FloatQuad.h"

+#include "Frame.h"

+#include "FrameView.h"

+#include "GraphicsContext.h"

+#include "HTMLNames.h"

+#include "HitTestResult.h"

+#include "InlineTextBox.h"

+#include "RenderImage.h"

+#include "RenderInline.h"

+#include "RenderMarquee.h"

+#include "RenderReplica.h"

+#include "RenderTableCell.h"

+#include "RenderTextFragment.h"

+#include "RenderTheme.h"

+#include "RenderView.h"

+#include "SelectionController.h"

+#include <wtf/StdLibExtras.h>

+using namespace std;

+using namespace WTF;

+using namespace Unicode;

+namespace WebCore {

+// Number of pixels to allow as a fudge factor when clicking above or below a line.

+// clicking up to verticalLineClickFudgeFactor pixels above a line will correspond to the closest point on the line.

+const int verticalLineClickFudgeFactor= 3;

+using namespace HTMLNames;

+static void moveChild(RenderObject* to, RenderObjectChildList* toChildList, RenderObject* from, RenderObjectChildList* fromChildList, RenderObject* child)

+ ASSERT(from == child->parent());

+ toChildList->appendChildNode(to, fromChildList->removeChildNode(from, child, false), false);

+struct ColumnInfo {

+ ColumnInfo()

+ : m_desiredColumnWidth(0)

+ , m_desiredColumnCount(1)

+ { }

+ int m_desiredColumnWidth;

+ unsigned m_desiredColumnCount;

+ Vector<IntRect> m_columnRects;

+};

+typedef WTF::HashMap<const RenderBox*, ColumnInfo*> ColumnInfoMap;

+static ColumnInfoMap* gColumnInfoMap = 0;

+typedef WTF::HashMap<const RenderBlock*, HashSet<RenderBox*>*> PercentHeightDescendantsMap;

+static PercentHeightDescendantsMap* gPercentHeightDescendantsMap = 0;

+typedef WTF::HashMap<const RenderBox*, HashSet<RenderBlock*>*> PercentHeightContainerMap;

+static PercentHeightContainerMap* gPercentHeightContainerMap = 0;

+typedef WTF::HashMap<RenderBlock*, ListHashSet<RenderInline*>*> ContinuationOutlineTableMap;

+// Our MarginInfo state used when laying out block children.

+RenderBlock::MarginInfo::MarginInfo(RenderBlock* block, int top, int bottom)

+ // Whether or not we can collapse our own margins with our children. We don't do this

+ // if we had any border/padding (obviously), if we're the root or HTML elements, or if

+ // we're positioned, floating, a table cell.

+ m_canCollapseWithChildren = !block->isRenderView() && !block->isRoot() && !block->isPositioned() &&

+ !block->isFloating() && !block->isTableCell() && !block->hasOverflowClip() && !block->isInlineBlockOrInlineTable();

+ m_canCollapseTopWithChildren = m_canCollapseWithChildren && (top == 0) && block->style()->marginTopCollapse() != MSEPARATE;

+ // If any height other than auto is specified in CSS, then we don't collapse our bottom

+ // margins with our children's margins. To do otherwise would be to risk odd visual

+ // effects when the children overflow out of the parent block and yet still collapse

+ // with it. We also don't collapse if we have any bottom border/padding.

+ m_canCollapseBottomWithChildren = m_canCollapseWithChildren && (bottom == 0) &&

+ (block->style()->height().isAuto() && block->style()->height().value() == 0) && block->style()->marginBottomCollapse() != MSEPARATE;

+ m_quirkContainer = block->isTableCell() || block->isBody() || block->style()->marginTopCollapse() == MDISCARD ||

+ block->style()->marginBottomCollapse() == MDISCARD;

+ m_atTopOfBlock = true;

+ m_atBottomOfBlock = false;

+ m_posMargin = m_canCollapseTopWithChildren ? block->maxTopMargin(true) : 0;

+ m_negMargin = m_canCollapseTopWithChildren ? block->maxTopMargin(false) : 0;

+ m_selfCollapsingBlockClearedFloat = false;

+ m_topQuirk = m_bottomQuirk = m_determinedTopQuirk = false;

+// -------------------------------------------------------------------------------------------------------

+RenderBlock::RenderBlock(Node* node)

+ : RenderBox(node)

+ , m_floatingObjects(0)

+ , m_positionedObjects(0)

+ , m_inlineContinuation(0)

+ , m_maxMargin(0)

+ , m_overflowHeight(0)

+ , m_overflowWidth(0)

+ , m_overflowLeft(0)

+ , m_overflowTop(0)

+ , m_lineHeight(-1)

+ setChildrenInline(true);

+RenderBlock::~RenderBlock()

+ delete m_floatingObjects;

+ delete m_positionedObjects;

+ delete m_maxMargin;

+ if (hasColumns())

+ delete gColumnInfoMap->take(this);

+ if (gPercentHeightDescendantsMap) {

+ if (HashSet<RenderBox*>* descendantSet = gPercentHeightDescendantsMap->take(this)) {

+ HashSet<RenderBox*>::iterator end = descendantSet->end();

+ for (HashSet<RenderBox*>::iterator descendant = descendantSet->begin(); descendant != end; ++descendant) {

+ HashSet<RenderBlock*>* containerSet = gPercentHeightContainerMap->get(*descendant);

+ ASSERT(containerSet);

+ if (!containerSet)

+ continue;

+ ASSERT(containerSet->contains(this));

+ containerSet->remove(this);

+ if (containerSet->isEmpty()) {

+ gPercentHeightContainerMap->remove(*descendant);

+ delete containerSet;

+ }

+ delete descendantSet;

+ }

+void RenderBlock::destroy()

+ // Detach our continuation first.

+ if (m_inlineContinuation)

+ m_inlineContinuation->destroy();

+ m_inlineContinuation = 0;

+ // Make sure to destroy anonymous children first while they are still connected to the rest of the tree, so that they will

+ // properly dirty line boxes that they are removed from. Effects that do :before/:after only on hover could crash otherwise.

+ children()->destroyLeftoverChildren();

+ if (!documentBeingDestroyed()) {

+ if (firstLineBox()) {

+ // We can't wait for RenderBox::destroy to clear the selection,

+ // because by then we will have nuked the line boxes.

+ // FIXME: The SelectionController should be responsible for this when it

+ // is notified of DOM mutations.

+ if (isSelectionBorder())

+ view()->clearSelection();

+ // If we are an anonymous block, then our line boxes might have children

+ // that will outlast this block. In the non-anonymous block case those

+ // children will be destroyed by the time we return from this function.

+ if (isAnonymousBlock()) {

+ for (InlineFlowBox* box = firstLineBox(); box; box = box->nextFlowBox()) {

+ while (InlineBox* childBox = box->firstChild())

+ childBox->remove();

+ }

+ } else if (isInline() && parent())

+ parent()->dirtyLinesFromChangedChild(this);

+ }

+ m_lineBoxes.deleteLineBoxes(renderArena());

+ RenderBox::destroy();

+void RenderBlock::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)

+ setReplaced(newStyle->isDisplayReplacedType());

+ if (style() && parent() && diff == StyleDifferenceLayout && style()->position() != newStyle->position()) {

+ if (newStyle->position() == StaticPosition)

+ // Clear our positioned objects list. Our absolutely positioned descendants will be

+ // inserted into our containing block's positioned objects list during layout.

+ removePositionedObjects(0);

+ else if (style()->position() == StaticPosition) {

+ // Remove our absolutely positioned descendants from their current containing block.

+ // They will be inserted into our positioned objects list during layout.

+ RenderObject* cb = parent();

+ while (cb && (cb->style()->position() == StaticPosition || (cb->isInline() && !cb->isReplaced())) && !cb->isRenderView()) {

+ if (cb->style()->position() == RelativePosition && cb->isInline() && !cb->isReplaced()) {

+ cb = cb->containingBlock();

+ break;

+ }

+ cb = cb->parent();

+ }

+ if (cb->isRenderBlock())

+ toRenderBlock(cb)->removePositionedObjects(this);

+ }

+ RenderBox::styleWillChange(diff, newStyle);

+void RenderBlock::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)

+ RenderBox::styleDidChange(diff, oldStyle);

+ // FIXME: We could save this call when the change only affected non-inherited properties

+ for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {

+ if (child->isAnonymousBlock()) {

+ RefPtr<RenderStyle> newStyle = RenderStyle::create();

+ newStyle->inheritFrom(style());

+ newStyle->setDisplay(BLOCK);

+ child->setStyle(newStyle.release());

+ }

+ m_lineHeight = -1;

+ // Update pseudos for :before and :after now.

+ if (!isAnonymous() && document()->usesBeforeAfterRules() && canHaveChildren()) {

+ updateBeforeAfterContent(BEFORE);

+ updateBeforeAfterContent(AFTER);

+ }

+ updateFirstLetter();

+void RenderBlock::updateBeforeAfterContent(PseudoId pseudoId)

+ // If this is an anonymous wrapper, then the parent applies its own pseudo-element style to it.

+ if (parent() && parent()->createsAnonymousWrapper())

+ return;

+ return children()->updateBeforeAfterContent(this, pseudoId);

+void RenderBlock::addChild(RenderObject* newChild, RenderObject* beforeChild)

+ // Make sure we don't append things after :after-generated content if we have it.

+ if (!beforeChild && isAfterContent(lastChild()))

+ beforeChild = lastChild();

+ bool madeBoxesNonInline = false;

+ // If the requested beforeChild is not one of our children, then this is because

+ // there is an anonymous container within this object that contains the beforeChild.

+ if (beforeChild && beforeChild->parent() != this) {

+ RenderObject* anonymousChild = beforeChild->parent();

+ ASSERT(anonymousChild);

+ while (anonymousChild->parent() != this)

+ anonymousChild = anonymousChild->parent();

+ ASSERT(anonymousChild->isAnonymous());

+ if (anonymousChild->isAnonymousBlock()) {

+ // Insert the child into the anonymous block box instead of here.

+ if (newChild->isInline() || beforeChild->parent()->firstChild() != beforeChild)

+ beforeChild->parent()->addChild(newChild, beforeChild);

+ else

+ addChild(newChild, beforeChild->parent());

+ return;

+ }

+ ASSERT(anonymousChild->isTable());

+ if (newChild->isTableCol() && newChild->style()->display() == TABLE_COLUMN_GROUP

+ || newChild->isRenderBlock() && newChild->style()->display() == TABLE_CAPTION

+ || newChild->isTableSection()

+ || newChild->isTableRow()

+ || newChild->isTableCell()) {

+ // Insert into the anonymous table.

+ anonymousChild->addChild(newChild, beforeChild);

+ return;

+ }

+ // Go on to insert before the anonymous table.

+ beforeChild = anonymousChild;

+ }

+ // A block has to either have all of its children inline, or all of its children as blocks.

+ // So, if our children are currently inline and a block child has to be inserted, we move all our

+ // inline children into anonymous block boxes.

+ if (childrenInline() && !newChild->isInline() && !newChild->isFloatingOrPositioned()) {

+ // This is a block with inline content. Wrap the inline content in anonymous blocks.

+ makeChildrenNonInline(beforeChild);

+ madeBoxesNonInline = true;

+ if (beforeChild && beforeChild->parent() != this) {

+ beforeChild = beforeChild->parent();

+ ASSERT(beforeChild->isAnonymousBlock());

+ ASSERT(beforeChild->parent() == this);

+ }

+ } else if (!childrenInline() && (newChild->isFloatingOrPositioned() || newChild->isInline())) {

+ // If we're inserting an inline child but all of our children are blocks, then we have to make sure

+ // it is put into an anomyous block box. We try to use an existing anonymous box if possible, otherwise

+ // a new one is created and inserted into our list of children in the appropriate position.

+ RenderObject* afterChild = beforeChild ? beforeChild->previousSibling() : lastChild();

+ if (afterChild && afterChild->isAnonymousBlock()) {

+ afterChild->addChild(newChild);

+ return;

+ }

+ if (newChild->isInline()) {

+ // No suitable existing anonymous box - create a new one.

+ RenderBlock* newBox = createAnonymousBlock();

+ RenderBox::addChild(newBox, beforeChild);

+ newBox->addChild(newChild);

+ return;

+ }

+ RenderBox::addChild(newChild, beforeChild);

+ if (madeBoxesNonInline && parent() && isAnonymousBlock() && parent()->isRenderBlock())

+ toRenderBlock(parent())->removeLeftoverAnonymousBlock(this);

+ // this object may be dead here

+static void getInlineRun(RenderObject* start, RenderObject* boundary,

+ RenderObject*& inlineRunStart,

+ RenderObject*& inlineRunEnd)

+ // Beginning at |start| we find the largest contiguous run of inlines that

+ // we can. We denote the run with start and end points, |inlineRunStart|

+ // and |inlineRunEnd|. Note that these two values may be the same if

+ // we encounter only one inline.

+ //

+ // We skip any non-inlines we encounter as long as we haven't found any

+ // inlines yet.

+ //

+ // |boundary| indicates a non-inclusive boundary point. Regardless of whether |boundary|

+ // is inline or not, we will not include it in a run with inlines before it. It's as though we encountered

+ // a non-inline.

+ // Start by skipping as many non-inlines as we can.

+ RenderObject * curr = start;

+ bool sawInline;

+ do {

+ while (curr && !(curr->isInline() || curr->isFloatingOrPositioned()))

+ curr = curr->nextSibling();

+ inlineRunStart = inlineRunEnd = curr;

+ if (!curr)

+ return; // No more inline children to be found.

+ sawInline = curr->isInline();

+ curr = curr->nextSibling();

+ while (curr && (curr->isInline() || curr->isFloatingOrPositioned()) && (curr != boundary)) {

+ inlineRunEnd = curr;

+ if (curr->isInline())

+ sawInline = true;

+ curr = curr->nextSibling();

+ }

+ } while (!sawInline);

+void RenderBlock::deleteLineBoxTree()

+ m_lineBoxes.deleteLineBoxTree(renderArena());

+void RenderBlock::dirtyLineBoxes(bool fullLayout, bool isRootLineBox)

+ if (!isRootLineBox && isReplaced())

+ return RenderBox::dirtyLineBoxes(fullLayout, isRootLineBox);

+ if (fullLayout)

+ m_lineBoxes.deleteLineBoxes(renderArena());

+ else

+ m_lineBoxes.dirtyLineBoxes();

+InlineBox* RenderBlock::createInlineBox(bool makePlaceHolderBox, bool isRootLineBox, bool /*isOnlyRun*/)

+ if (!isRootLineBox && (isReplaced() || makePlaceHolderBox)) // Inline tables and inline blocks

+ return RenderBox::createInlineBox(false, isRootLineBox); // (or positioned element placeholders).

+ InlineFlowBox* flowBox = new (renderArena()) RootInlineBox(this);

+ m_lineBoxes.appendLineBox(flowBox);

+ return flowBox;

+void RenderBlock::makeChildrenNonInline(RenderObject *insertionPoint)

+ // makeChildrenNonInline takes a block whose children are *all* inline and it

+ // makes sure that inline children are coalesced under anonymous

+ // blocks. If |insertionPoint| is defined, then it represents the insertion point for

+ // the new block child that is causing us to have to wrap all the inlines. This

+ // means that we cannot coalesce inlines before |insertionPoint| with inlines following

+ // |insertionPoint|, because the new child is going to be inserted in between the inlines,

+ // splitting them.

+ ASSERT(isInlineBlockOrInlineTable() || !isInline());

+ ASSERT(!insertionPoint || insertionPoint->parent() == this);

+ setChildrenInline(false);

+ RenderObject *child = firstChild();

+ if (!child)

+ return;

+ deleteLineBoxTree();

+ while (child) {

+ RenderObject *inlineRunStart, *inlineRunEnd;

+ getInlineRun(child, insertionPoint, inlineRunStart, inlineRunEnd);

+ if (!inlineRunStart)

+ break;

+ child = inlineRunEnd->nextSibling();

+ RenderBlock* block = createAnonymousBlock();

+ children()->insertChildNode(this, block, inlineRunStart);

+ RenderObject* o = inlineRunStart;

+ while (o != inlineRunEnd) {

+ RenderObject* no = o;

+ o = no->nextSibling();

+ moveChild(block, block->children(), this, children(), no);

+ }

+ moveChild(block, block->children(), this, children(), inlineRunEnd);

+ }

+#ifndef NDEBUG

+ for (RenderObject *c = firstChild(); c; c = c->nextSibling())

+ ASSERT(!c->isInline());

+#endif

+ repaint();

+void RenderBlock::removeLeftoverAnonymousBlock(RenderBlock* child)

+ ASSERT(child->isAnonymousBlock());

+ ASSERT(!child->childrenInline());

+ if (child->inlineContinuation())

+ return;

+ RenderObject* firstAnChild = child->m_children.firstChild();

+ RenderObject* lastAnChild = child->m_children.lastChild();

+ if (firstAnChild) {

+ RenderObject* o = firstAnChild;

+ while (o) {

+ o->setParent(this);

+ o = o->nextSibling();

+ }

+ firstAnChild->setPreviousSibling(child->previousSibling());

+ lastAnChild->setNextSibling(child->nextSibling());

+ if (child->previousSibling())

+ child->previousSibling()->setNextSibling(firstAnChild);

+ if (child->nextSibling())

+ child->nextSibling()->setPreviousSibling(lastAnChild);

+ } else {

+ if (child->previousSibling())

+ child->previousSibling()->setNextSibling(child->nextSibling());

+ if (child->nextSibling())

+ child->nextSibling()->setPreviousSibling(child->previousSibling());

+ }

+ if (child == m_children.firstChild())

+ m_children.setFirstChild(firstAnChild);

+ if (child == m_children.lastChild())

+ m_children.setLastChild(lastAnChild);

+ child->setParent(0);

+ child->setPreviousSibling(0);

+ child->setNextSibling(0);

+ child->children()->setFirstChild(0);

+ child->m_next = 0;

+ child->destroy();

+void RenderBlock::removeChild(RenderObject* oldChild)

+ // If this child is a block, and if our previous and next siblings are

+ // both anonymous blocks with inline content, then we can go ahead and

+ // fold the inline content back together.

+ RenderObject* prev = oldChild->previousSibling();

+ RenderObject* next = oldChild->nextSibling();

+ bool canDeleteAnonymousBlocks = !documentBeingDestroyed() && !isInline() && !oldChild->isInline() &&

+ (!oldChild->isRenderBlock() || !toRenderBlock(oldChild)->inlineContinuation()) &&

+ (!prev || (prev->isAnonymousBlock() && prev->childrenInline())) &&

+ (!next || (next->isAnonymousBlock() && next->childrenInline()));

+ if (canDeleteAnonymousBlocks && prev && next) {

+ // Take all the children out of the |next| block and put them in

+ // the |prev| block.

+ prev->setNeedsLayoutAndPrefWidthsRecalc();

+ RenderObject* o = next->firstChild();

+ RenderBlock* nextBlock = toRenderBlock(next);

+ RenderBlock* prevBlock = toRenderBlock(prev);

+ while (o) {

+ RenderObject* no = o;

+ o = no->nextSibling();

+ moveChild(prevBlock, prevBlock->children(), nextBlock, nextBlock->children(), no);

+ }

+ nextBlock->deleteLineBoxTree();

+ // Nuke the now-empty block.

+ next->destroy();

+ }

+ RenderBox::removeChild(oldChild);

+ RenderObject* child = prev ? prev : next;

+ if (canDeleteAnonymousBlocks && child && !child->previousSibling() && !child->nextSibling() && !isFlexibleBox()) {

+ // The removal has knocked us down to containing only a single anonymous

+ // box. We can go ahead and pull the content right back up into our

+ // box.

+ setNeedsLayoutAndPrefWidthsRecalc();

+ RenderBlock* anonBlock = toRenderBlock(children()->removeChildNode(this, child, false));

+ setChildrenInline(true);

+ RenderObject* o = anonBlock->firstChild();

+ while (o) {

+ RenderObject* no = o;

+ o = no->nextSibling();

+ moveChild(this, children(), anonBlock, anonBlock->children(), no);

+ }

+ // Delete the now-empty block's lines and nuke it.

+ anonBlock->deleteLineBoxTree();

+ anonBlock->destroy();

+ }

+int RenderBlock::overflowHeight(bool includeInterior) const

+ if (!includeInterior && hasOverflowClip()) {

+ int shadowHeight = 0;

+ for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next)

+ shadowHeight = max(boxShadow->y + boxShadow->blur, shadowHeight);

+ int inflatedHeight = height() + shadowHeight;

+ if (hasReflection())

+ inflatedHeight = max(inflatedHeight, reflectionBox().bottom());

+ return inflatedHeight;

+ }

+ return m_overflowHeight;

+int RenderBlock::overflowWidth(bool includeInterior) const

+ if (!includeInterior && hasOverflowClip()) {

+ int shadowWidth = 0;

+ for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next)

+ shadowWidth = max(boxShadow->x + boxShadow->blur, shadowWidth);

+ int inflatedWidth = width() + shadowWidth;

+ if (hasReflection())

+ inflatedWidth = max(inflatedWidth, reflectionBox().right());

+ return inflatedWidth;

+ }

+ return m_overflowWidth;

+int RenderBlock::overflowLeft(bool includeInterior) const

+ if (!includeInterior && hasOverflowClip()) {

+ int shadowLeft = 0;

+ for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next)

+ shadowLeft = min(boxShadow->x - boxShadow->blur, shadowLeft);

+ int left = shadowLeft;

+ if (hasReflection())

+ left = min(left, reflectionBox().x());

+ return left;

+ }

+ return m_overflowLeft;

+int RenderBlock::overflowTop(bool includeInterior) const

+ if (!includeInterior && hasOverflowClip()) {

+ int shadowTop = 0;

+ for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next)

+ shadowTop = min(boxShadow->y - boxShadow->blur, shadowTop);

+ int top = shadowTop;

+ if (hasReflection())

+ top = min(top, reflectionBox().y());

+ return top;

+ }

+ return m_overflowTop;

+IntRect RenderBlock::overflowRect(bool includeInterior) const

+ if (!includeInterior && hasOverflowClip()) {

+ IntRect box = borderBoxRect();

+ int shadowLeft = 0;

+ int shadowRight = 0;

+ int shadowTop = 0;

+ int shadowBottom = 0;

+ for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) {

+ shadowLeft = min(boxShadow->x - boxShadow->blur, shadowLeft);

+ shadowRight = max(boxShadow->x + boxShadow->blur, shadowRight);

+ shadowTop = min(boxShadow->y - boxShadow->blur, shadowTop);

+ shadowBottom = max(boxShadow->y + boxShadow->blur, shadowBottom);

+ }

+ box.move(shadowLeft, shadowTop);

+ box.setWidth(box.width() - shadowLeft + shadowRight);

+ box.setHeight(box.height() - shadowTop + shadowBottom);

+ if (hasReflection()) {

+ IntRect reflection(reflectionBox());

+ int reflectTop = min(box.y(), reflection.y());

+ int reflectBottom = max(box.bottom(), reflection.bottom());

+ box.setHeight(reflectBottom - reflectTop);

+ box.setY(reflectTop);

+ int reflectLeft = min(box.x(), reflection.x());

+ int reflectRight = max(box.right(), reflection.right());

+ box.setWidth(reflectRight - reflectLeft);

+ box.setX(reflectLeft);

+ }

+ return box;

+ }

+ if (!includeInterior && hasOverflowClip())

+ return borderBoxRect();

+ int l = overflowLeft(includeInterior);

+ int t = overflowTop(includeInterior);

+ return IntRect(l, t, overflowWidth(includeInterior) - l, max(overflowHeight(includeInterior), height()) - t);

+bool RenderBlock::isSelfCollapsingBlock() const

+ // We are not self-collapsing if we

+ // (a) have a non-zero height according to layout (an optimization to avoid wasting time)

+ // (b) are a table,

+ // (c) have border/padding,

+ // (d) have a min-height

+ // (e) have specified that one of our margins can't collapse using a CSS extension

+ if (height() > 0 ||

+ isTable() || (borderBottom() + paddingBottom() + borderTop() + paddingTop()) != 0 ||

+ style()->minHeight().isPositive() ||

+ style()->marginTopCollapse() == MSEPARATE || style()->marginBottomCollapse() == MSEPARATE)

+ return false;

+ bool hasAutoHeight = style()->height().isAuto();

+ if (style()->height().isPercent() && !style()->htmlHacks()) {

+ hasAutoHeight = true;

+ for (RenderBlock* cb = containingBlock(); !cb->isRenderView(); cb = cb->containingBlock()) {

+ if (cb->style()->height().isFixed() || cb->isTableCell())

+ hasAutoHeight = false;

+ }

+ // If the height is 0 or auto, then whether or not we are a self-collapsing block depends

+ // on whether we have content that is all self-collapsing or not.

+ if (hasAutoHeight || ((style()->height().isFixed() || style()->height().isPercent()) && style()->height().isZero())) {

+ // If the block has inline children, see if we generated any line boxes. If we have any

+ // line boxes, then we can't be self-collapsing, since we have content.

+ if (childrenInline())

+ return !firstLineBox();

+ // Whether or not we collapse is dependent on whether all our normal flow children

+ // are also self-collapsing.

+ for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {

+ if (child->isFloatingOrPositioned())

+ continue;

+ if (!child->isSelfCollapsingBlock())

+ return false;

+ }

+ return true;

+ }

+ return false;

+void RenderBlock::layout()

+ // Update our first letter info now.

+ updateFirstLetter();

+ // Table cells call layoutBlock directly, so don't add any logic here. Put code into

+ // layoutBlock().

+ layoutBlock(false);

+ // It's safe to check for control clip here, since controls can never be table cells.

+ if (hasControlClip()) {

+ // Because of the lightweight clip, there can never be any overflow from children.

+ m_overflowWidth = width();

+ m_overflowHeight = height();

+ m_overflowLeft = 0;

+ m_overflowTop = 0;

+ }

+void RenderBlock::layoutBlock(bool relayoutChildren)

+ ASSERT(needsLayout());

+ if (isInline() && !isInlineBlockOrInlineTable()) // Inline <form>s inside various table elements can

+ return; // cause us to come in here. Just bail.

+ if (!relayoutChildren && layoutOnlyPositionedObjects())

+ return;

+ LayoutRepainter repainter(*this, m_everHadLayout && checkForRepaintDuringLayout());

+ LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), hasColumns() || hasTransform() || hasReflection());

+ int oldWidth = width();

+ int oldColumnWidth = desiredColumnWidth();

+ calcWidth();

+ calcColumnWidth();

+ m_overflowWidth = width();

+ m_overflowLeft = 0;

+ if (oldWidth != width() || oldColumnWidth != desiredColumnWidth())

+ relayoutChildren = true;

+ clearFloats();

+ int previousHeight = height();

+ setHeight(0);

+ m_overflowHeight = 0;

+ // We use four values, maxTopPos, maxPosNeg, maxBottomPos, and maxBottomNeg, to track

+ // our current maximal positive and negative margins. These values are used when we

+ // are collapsed with adjacent blocks, so for example, if you have block A and B

+ // collapsing together, then you'd take the maximal positive margin from both A and B

+ // and subtract it from the maximal negative margin from both A and B to get the

+ // true collapsed margin. This algorithm is recursive, so when we finish layout()

+ // our block knows its current maximal positive/negative values.

+ //

+ // Start out by setting our margin values to our current margins. Table cells have

+ // no margins, so we don't fill in the values for table cells.

+ bool isCell = isTableCell();

+ if (!isCell) {

+ initMaxMarginValues();

+ setTopMarginQuirk(style()->marginTop().quirk());

+ setBottomMarginQuirk(style()->marginBottom().quirk());

+ Node* node = element();

+ if (node && node->hasTagName(formTag) && static_cast<HTMLFormElement*>(node)->isMalformed()) {

+ // See if this form is malformed (i.e., unclosed). If so, don't give the form

+ // a bottom margin.

+ setMaxBottomMargins(0, 0);

+ }

+ // For overflow:scroll blocks, ensure we have both scrollbars in place always.

+ if (scrollsOverflow()) {

+ if (style()->overflowX() == OSCROLL)

+ layer()->setHasHorizontalScrollbar(true);

+ if (style()->overflowY() == OSCROLL)

+ layer()->setHasVerticalScrollbar(true);

+ }

+ int repaintTop = 0;

+ int repaintBottom = 0;

+ int maxFloatBottom = 0;

+ if (childrenInline())

+ layoutInlineChildren(relayoutChildren, repaintTop, repaintBottom);

+ else

+ layoutBlockChildren(relayoutChildren, maxFloatBottom);

+ // Expand our intrinsic height to encompass floats.

+ int toAdd = borderBottom() + paddingBottom() + horizontalScrollbarHeight();

+ if (floatBottom() > (height() - toAdd) && expandsToEncloseOverhangingFloats())

+ setHeight(floatBottom() + toAdd);

+ // Now lay out our columns within this intrinsic height, since they can slightly affect the intrinsic height as

+ // we adjust for clean column breaks.

+ int singleColumnBottom = layoutColumns();

+ // Calculate our new height.

+ int oldHeight = height();

+ calcHeight();

+ if (oldHeight != height()) {

+ if (oldHeight > height() && maxFloatBottom > height() && !childrenInline()) {

+ // One of our children's floats may have become an overhanging float for us. We need to look for it.

+ for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {

+ if (child->isBlockFlow() && !child->isFloatingOrPositioned()) {

+ RenderBlock* block = toRenderBlock(child);

+ if (block->floatBottom() + block->y() > height())

+ addOverhangingFloats(block, -block->x(), -block->y(), false);

+ }

+ // We have to rebalance columns to the new height.

+ layoutColumns(singleColumnBottom);

+ // If the block got expanded in size, then increase our overflowheight to match.

+ if (m_overflowHeight > height())

+ m_overflowHeight -= toAdd;

+ if (m_overflowHeight < height())

+ m_overflowHeight = height();

+ }

+ if (previousHeight != height())

+ relayoutChildren = true;

+ if ((isCell || isInline() || isFloatingOrPositioned() || isRoot()) && !hasOverflowClip() && !hasControlClip())

+ addVisualOverflow(floatRect());

+ layoutPositionedObjects(relayoutChildren || isRoot());

+ positionListMarker();

+ // Always ensure our overflow width/height are at least as large as our width/height.

+ m_overflowWidth = max(m_overflowWidth, width());

+ m_overflowHeight = max(m_overflowHeight, height());

+ if (!hasOverflowClip()) {

+ for (ShadowData* boxShadow = style()->boxShadow(); boxShadow; boxShadow = boxShadow->next) {

+ m_overflowLeft = min(m_overflowLeft, boxShadow->x - boxShadow->blur);

+ m_overflowWidth = max(m_overflowWidth, width() + boxShadow->x + boxShadow->blur);

+ m_overflowTop = min(m_overflowTop, boxShadow->y - boxShadow->blur);

+ m_overflowHeight = max(m_overflowHeight, height() + boxShadow->y + boxShadow->blur);

+ }

+ if (hasReflection()) {

+ m_overflowTop = min(m_overflowTop, reflectionBox().y());

+ m_overflowHeight = max(m_overflowHeight, reflectionBox().bottom());

+ }

+ statePusher.pop();

+ // Update our scroll information if we're overflow:auto/scroll/hidden now that we know if

+ // we overflow or not.

+ if (hasOverflowClip())

+ layer()->updateScrollInfoAfterLayout();

+ // Repaint with our new bounds if they are different from our old bounds.

+ bool didFullRepaint = repainter.repaintAfterLayout();

+ if (!didFullRepaint && repaintTop != repaintBottom && (style()->visibility() == VISIBLE || enclosingLayer()->hasVisibleContent())) {

+ IntRect repaintRect(m_overflowLeft, repaintTop, m_overflowWidth - m_overflowLeft, repaintBottom - repaintTop);

+ // FIXME: Deal with multiple column repainting. We have to split the repaint

+ // rect up into multiple rects if it spans columns.

+ repaintRect.inflate(maximalOutlineSize(PaintPhaseOutline));

+ if (hasOverflowClip()) {

+ // Adjust repaint rect for scroll offset

+ int x = repaintRect.x();

+ int y = repaintRect.y();

+ layer()->subtractScrolledContentOffset(x, y);

+ repaintRect.setX(x);

+ repaintRect.setY(y);

+ // Don't allow this rect to spill out of our overflow box.

+ repaintRect.intersect(IntRect(0, 0, width(), height()));

+ }

+ // Make sure the rect is still non-empty after intersecting for overflow above

+ if (!repaintRect.isEmpty()) {

+ repaintRectangle(repaintRect); // We need to do a partial repaint of our content.

+ if (hasReflection())

+ layer()->reflection()->repaintRectangle(repaintRect);

+ }

+ setNeedsLayout(false);

+bool RenderBlock::expandsToEncloseOverhangingFloats() const

+ return isInlineBlockOrInlineTable() || isFloatingOrPositioned() || hasOverflowClip() || (parent() && parent()->isFlexibleBox()) || hasColumns() || isTableCell() || isFieldset();

+void RenderBlock::adjustPositionedBlock(RenderBox* child, const MarginInfo& marginInfo)

+ if (child->style()->hasStaticX()) {

+ if (style()->direction() == LTR)

+ child->layer()->setStaticX(borderLeft() + paddingLeft());

+ else

+ child->layer()->setStaticX(borderRight() + paddingRight());

+ }

+ if (child->style()->hasStaticY()) {

+ int y = height();

+ if (!marginInfo.canCollapseWithTop()) {

+ child->calcVerticalMargins();

+ int marginTop = child->marginTop();

+ int collapsedTopPos = marginInfo.posMargin();

+ int collapsedTopNeg = marginInfo.negMargin();

+ if (marginTop > 0) {

+ if (marginTop > collapsedTopPos)

+ collapsedTopPos = marginTop;

+ } else {

+ if (-marginTop > collapsedTopNeg)

+ collapsedTopNeg = -marginTop;

+ }

+ y += (collapsedTopPos - collapsedTopNeg) - marginTop;

+ }

+ child->layer()->setStaticY(y);

+ }

+void RenderBlock::adjustFloatingBlock(const MarginInfo& marginInfo)

+ // The float should be positioned taking into account the bottom margin

+ // of the previous flow. We add that margin into the height, get the

+ // float positioned properly, and then subtract the margin out of the

+ // height again. In the case of self-collapsing blocks, we always just

+ // use the top margins, since the self-collapsing block collapsed its

+ // own bottom margin into its top margin.

+ //

+ // Note also that the previous flow may collapse its margin into the top of

+ // our block. If this is the case, then we do not add the margin in to our

+ // height when computing the position of the float. This condition can be tested

+ // for by simply calling canCollapseWithTop. See

+ // http://www.hixie.ch/tests/adhoc/css/box/block/margin-collapse/046.html for

+ // an example of this scenario.

+ int marginOffset = marginInfo.canCollapseWithTop() ? 0 : marginInfo.margin();

+ setHeight(height() + marginOffset);

+ positionNewFloats();

+ setHeight(height() - marginOffset);

+RenderBox* RenderBlock::handleSpecialChild(RenderBox* child, const MarginInfo& marginInfo, bool& handled)

+ // Handle positioned children first.

+ RenderBox* next = handlePositionedChild(child, marginInfo, handled);

+ if (handled) return next;

+ // Handle floating children next.

+ next = handleFloatingChild(child, marginInfo, handled);

+ if (handled) return next;

+ // Finally, see if we have a run-in element.

+ return handleRunInChild(child, handled);

+RenderBox* RenderBlock::handlePositionedChild(RenderBox* child, const MarginInfo& marginInfo, bool& handled)

+ if (child->isPositioned()) {

+ handled = true;

+ child->containingBlock()->insertPositionedObject(child);

+ adjustPositionedBlock(child, marginInfo);

+ return child->nextSiblingBox();

+ }

+ return 0;

+RenderBox* RenderBlock::handleFloatingChild(RenderBox* child, const MarginInfo& marginInfo, bool& handled)

+ if (child->isFloating()) {

+ handled = true;

+ insertFloatingObject(child);

+ adjustFloatingBlock(marginInfo);

+ return child->nextSiblingBox();

+ }

+ return 0;

+RenderBox* RenderBlock::handleRunInChild(RenderBox* child, bool& handled)

+ // See if we have a run-in element with inline children. If the

+ // children aren't inline, then just treat the run-in as a normal

+ // block.

+ if (child->isRunIn() && (child->childrenInline() || child->isReplaced())) {

+ RenderBlock* blockRunIn = toRenderBlock(child);

+ // Get the next non-positioned/non-floating RenderBlock.

+ RenderObject* curr = blockRunIn->nextSibling();

+ while (curr && curr->isFloatingOrPositioned())

+ curr = curr->nextSibling();

+ if (curr && (curr->isRenderBlock() && curr->childrenInline() && !curr->isRunIn())) {

+ RenderBlock* currBlock = toRenderBlock(curr);

+ // The block acts like an inline, so just null out its

+ // position.

+ handled = true;

+ // Remove the old child.

+ RenderBox* next = blockRunIn->nextSiblingBox();

+ children()->removeChildNode(this, blockRunIn);

+ // Create an inline.

+ RenderInline* inlineRunIn = new (renderArena()) RenderInline(blockRunIn->node());

+ inlineRunIn->setStyle(blockRunIn->style());

+ // Move the nodes from the old child to the new child.

+ for (RenderObject* runInChild = blockRunIn->firstChild(); runInChild; runInChild = runInChild->nextSibling())

+ moveChild(inlineRunIn, inlineRunIn->children(), blockRunIn, blockRunIn->children(), runInChild);

+ // Now insert the new child under |currBlock|.

+ currBlock->children()->insertChildNode(currBlock, inlineRunIn, currBlock->firstChild());

+ // If the run-in had an element, we need to set the new renderer.

+ if (blockRunIn->element())

+ blockRunIn->element()->setRenderer(inlineRunIn);

+ // Destroy the block run-in.

+ blockRunIn->destroy();

+ return next;

+ }

+ return 0;

+void RenderBlock::collapseMargins(RenderBox* child, MarginInfo& marginInfo, int yPosEstimate)

+ // Get our max pos and neg top margins.

+ int posTop = child->maxTopMargin(true);

+ int negTop = child->maxTopMargin(false);

+ // For self-collapsing blocks, collapse our bottom margins into our

+ // top to get new posTop and negTop values.

+ if (child->isSelfCollapsingBlock()) {

+ posTop = max(posTop, child->maxBottomMargin(true));

+ negTop = max(negTop, child->maxBottomMargin(false));

+ }

+ // See if the top margin is quirky. We only care if this child has

+ // margins that will collapse with us.

+ bool topQuirk = child->isTopMarginQuirk() || style()->marginTopCollapse() == MDISCARD;

+ if (marginInfo.canCollapseWithTop()) {

+ // This child is collapsing with the top of the

+ // block. If it has larger margin values, then we need to update

+ // our own maximal values.

+ if (!style()->htmlHacks() || !marginInfo.quirkContainer() || !topQuirk)

+ setMaxTopMargins(max(posTop, maxTopPosMargin()), max(negTop, maxTopNegMargin()));

+ // The minute any of the margins involved isn't a quirk, don't

+ // collapse it away, even if the margin is smaller (www.webreference.com

+ // has an example of this, a <dt> with 0.8em author-specified inside

+ // a <dl> inside a <td>.

+ if (!marginInfo.determinedTopQuirk() && !topQuirk && (posTop-negTop)) {

+ setTopMarginQuirk(false);

+ marginInfo.setDeterminedTopQuirk(true);

+ }

+ if (!marginInfo.determinedTopQuirk() && topQuirk && marginTop() == 0)

+ // We have no top margin and our top child has a quirky margin.

+ // We will pick up this quirky margin and pass it through.

+ // This deals with the <td><div><p> case.

+ // Don't do this for a block that split two inlines though. You do

+ // still apply margins in this case.

+ setTopMarginQuirk(true);

+ }

+ if (marginInfo.quirkContainer() && marginInfo.atTopOfBlock() && (posTop - negTop))

+ marginInfo.setTopQuirk(topQuirk);

+ int ypos = height();

+ if (child->isSelfCollapsingBlock()) {

+ // This child has no height. We need to compute our

+ // position before we collapse the child's margins together,

+ // so that we can get an accurate position for the zero-height block.

+ int collapsedTopPos = max(marginInfo.posMargin(), child->maxTopMargin(true));

+ int collapsedTopNeg = max(marginInfo.negMargin(), child->maxTopMargin(false));

+ marginInfo.setMargin(collapsedTopPos, collapsedTopNeg);

+ // Now collapse the child's margins together, which means examining our

+ // bottom margin values as well.

+ marginInfo.setPosMarginIfLarger(child->maxBottomMargin(true));

+ marginInfo.setNegMarginIfLarger(child->maxBottomMargin(false));

+ if (!marginInfo.canCollapseWithTop())

+ // We need to make sure that the position of the self-collapsing block

+ // is correct, since it could have overflowing content

+ // that needs to be positioned correctly (e.g., a block that

+ // had a specified height of 0 but that actually had subcontent).

+ ypos = height() + collapsedTopPos - collapsedTopNeg;

+ }

+ else {

+ if (child->style()->marginTopCollapse() == MSEPARATE) {

+ setHeight(height() + marginInfo.margin() + child->marginTop());

+ ypos = height();

+ }

+ else if (!marginInfo.atTopOfBlock() ||

+ (!marginInfo.canCollapseTopWithChildren()

+ && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.topQuirk()))) {

+ // We're collapsing with a previous sibling's margins and not

+ // with the top of the block.

+ setHeight(height() + max(marginInfo.posMargin(), posTop) - max(marginInfo.negMargin(), negTop));

+ ypos = height();

+ }

+ marginInfo.setPosMargin(child->maxBottomMargin(true));

+ marginInfo.setNegMargin(child->maxBottomMargin(false));

+ if (marginInfo.margin())

+ marginInfo.setBottomQuirk(child->isBottomMarginQuirk() || style()->marginBottomCollapse() == MDISCARD);

+ marginInfo.setSelfCollapsingBlockClearedFloat(false);

+ }

+ view()->addLayoutDelta(IntSize(0, yPosEstimate - ypos));

+ child->setLocation(child->x(), ypos);

+ if (ypos != yPosEstimate) {

+ if (child->shrinkToAvoidFloats())

+ // The child's width depends on the line width.

+ // When the child shifts to clear an item, its width can

+ // change (because it has more available line width).

+ // So go ahead and mark the item as dirty.

+ child->setChildNeedsLayout(true, false);

+ if (!child->avoidsFloats() && child->containsFloats())

+ toRenderBlock(child)->markAllDescendantsWithFloatsForLayout();

+ // Our guess was wrong. Make the child lay itself out again.

+ child->layoutIfNeeded();

+ }

+void RenderBlock::clearFloatsIfNeeded(RenderBox* child, MarginInfo& marginInfo, int oldTopPosMargin, int oldTopNegMargin)

+ int heightIncrease = getClearDelta(child);

+ if (!heightIncrease)

+ return;

+ // The child needs to be lowered. Move the child so that it just clears the float.

+ view()->addLayoutDelta(IntSize(0, -heightIncrease));

+ child->setLocation(child->x(), child->y() + heightIncrease);

+ if (child->isSelfCollapsingBlock()) {

+ // For self-collapsing blocks that clear, they can still collapse their

+ // margins with following siblings. Reset the current margins to represent

+ // the self-collapsing block's margins only.

+ marginInfo.setPosMargin(max(child->maxTopMargin(true), child->maxBottomMargin(true)));

+ marginInfo.setNegMargin(max(child->maxTopMargin(false), child->maxBottomMargin(false)));

+ // Adjust our height such that we are ready to be collapsed with subsequent siblings.

+ setHeight(child->y() - max(0, marginInfo.margin()));

+ // Set a flag that we cleared a float so that we know both to increase the height of the block

+ // to compensate for the clear and to avoid collapsing our margins with the parent block's

+ // bottom margin.

+ marginInfo.setSelfCollapsingBlockClearedFloat(true);

+ } else

+ // Increase our height by the amount we had to clear.

+ setHeight(height() + heightIncrease);

+ if (marginInfo.canCollapseWithTop()) {

+ // We can no longer collapse with the top of the block since a clear

+ // occurred. The empty blocks collapse into the cleared block.

+ // FIXME: This isn't quite correct. Need clarification for what to do

+ // if the height the cleared block is offset by is smaller than the

+ // margins involved.

+ setMaxTopMargins(oldTopPosMargin, oldTopNegMargin);

+ marginInfo.setAtTopOfBlock(false);

+ }

+ // If our value of clear caused us to be repositioned vertically to be

+ // underneath a float, we might have to do another layout to take into account

+ // the extra space we now have available.

+ if (child->shrinkToAvoidFloats())

+ // The child's width depends on the line width.

+ // When the child shifts to clear an item, its width can

+ // change (because it has more available line width).

+ // So go ahead and mark the item as dirty.

+ child->setChildNeedsLayout(true, false);

+ if (!child->avoidsFloats() && child->containsFloats())

+ toRenderBlock(child)->markAllDescendantsWithFloatsForLayout();

+ child->layoutIfNeeded();

+int RenderBlock::estimateVerticalPosition(RenderBox* child, const MarginInfo& marginInfo)

+ // FIXME: We need to eliminate the estimation of vertical position, because when it's wrong we sometimes trigger a pathological

+ // relayout if there are intruding floats.

+ int yPosEstimate = height();

+ if (!marginInfo.canCollapseWithTop()) {

+ int childMarginTop = child->selfNeedsLayout() ? child->marginTop() : child->collapsedMarginTop();

+ yPosEstimate += max(marginInfo.margin(), childMarginTop);

+ }

+ return yPosEstimate;

+void RenderBlock::determineHorizontalPosition(RenderBox* child)

+ if (style()->direction() == LTR) {

+ int xPos = borderLeft() + paddingLeft();

+ // Add in our left margin.

+ int chPos = xPos + child->marginLeft();

+ // Some objects (e.g., tables, horizontal rules, overflow:auto blocks) avoid floats. They need

+ // to shift over as necessary to dodge any floats that might get in the way.

+ if (child->avoidsFloats()) {

+ int leftOff = leftOffset(height(), false);

+ if (style()->textAlign() != WEBKIT_CENTER && child->style()->marginLeft().type() != Auto) {

+ if (child->marginLeft() < 0)

+ leftOff += child->marginLeft();

+ chPos = max(chPos, leftOff); // Let the float sit in the child's margin if it can fit.

+ }

+ else if (leftOff != xPos) {

+ // The object is shifting right. The object might be centered, so we need to

+ // recalculate our horizontal margins. Note that the containing block content

+ // width computation will take into account the delta between |leftOff| and |xPos|

+ // so that we can just pass the content width in directly to the |calcHorizontalMargins|

+ // function.

+ child->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->y(), false));

+ chPos = leftOff + child->marginLeft();

+ }

+ view()->addLayoutDelta(IntSize(child->x() - chPos, 0));

+ child->setLocation(chPos, child->y());

+ } else {

+ int xPos = width() - borderRight() - paddingRight() - verticalScrollbarWidth();

+ int chPos = xPos - (child->width() + child->marginRight());

+ if (child->avoidsFloats()) {

+ int rightOff = rightOffset(height(), false);

+ if (style()->textAlign() != WEBKIT_CENTER && child->style()->marginRight().type() != Auto) {

+ if (child->marginRight() < 0)

+ rightOff -= child->marginRight();

+ chPos = min(chPos, rightOff - child->width()); // Let the float sit in the child's margin if it can fit.

+ } else if (rightOff != xPos) {

+ // The object is shifting left. The object might be centered, so we need to

+ // recalculate our horizontal margins. Note that the containing block content

+ // width computation will take into account the delta between |rightOff| and |xPos|

+ // so that we can just pass the content width in directly to the |calcHorizontalMargins|

+ // function.

+ child->calcHorizontalMargins(child->style()->marginLeft(), child->style()->marginRight(), lineWidth(child->y(), false));

+ chPos = rightOff - child->marginRight() - child->width();

+ }

+ view()->addLayoutDelta(IntSize(child->x() - chPos, 0));

+ child->setLocation(chPos, child->y());

+ }

+void RenderBlock::setCollapsedBottomMargin(const MarginInfo& marginInfo)

+ if (marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop()) {

+ // Update our max pos/neg bottom margins, since we collapsed our bottom margins

+ // with our children.

+ setMaxBottomMargins(max(maxBottomPosMargin(), marginInfo.posMargin()), max(maxBottomNegMargin(), marginInfo.negMargin()));

+ if (!marginInfo.bottomQuirk())

+ setBottomMarginQuirk(false);

+ if (marginInfo.bottomQuirk() && marginBottom() == 0)

+ // We have no bottom margin and our last child has a quirky margin.

+ // We will pick up this quirky margin and pass it through.

+ // This deals with the <td><div><p> case.

+ setBottomMarginQuirk(true);

+ }

+void RenderBlock::handleBottomOfBlock(int top, int bottom, MarginInfo& marginInfo)

+ // If our last flow was a self-collapsing block that cleared a float, then we don't

+ // collapse it with the bottom of the block.

+ if (!marginInfo.selfCollapsingBlockClearedFloat())

+ marginInfo.setAtBottomOfBlock(true);

+ else {

+ // We have to special case the negative margin situation (where the collapsed

+ // margin of the self-collapsing block is negative), since there's no need

+ // to make an adjustment in that case.

+ if (marginInfo.margin() < 0)

+ marginInfo.clearMargin();

+ }

+ // If we can't collapse with children then go ahead and add in the bottom margin.

+ if (!marginInfo.canCollapseWithBottom() && !marginInfo.canCollapseWithTop()

+ && (!style()->htmlHacks() || !marginInfo.quirkContainer() || !marginInfo.bottomQuirk()))

+ setHeight(height() + marginInfo.margin());

+ // Now add in our bottom border/padding.

+ setHeight(height() + bottom);

+ // Negative margins can cause our height to shrink below our minimal height (border/padding).

+ // If this happens, ensure that the computed height is increased to the minimal height.

+ setHeight(max(height(), top + bottom));

+ // Always make sure our overflow height is at least our height.

+ m_overflowHeight = max(height(), m_overflowHeight);

+ // Update our bottom collapsed margin info.

+ setCollapsedBottomMargin(marginInfo);

+void RenderBlock::layoutBlockChildren(bool relayoutChildren, int& maxFloatBottom)

+ if (gPercentHeightDescendantsMap) {

+ if (HashSet<RenderBox*>* descendants = gPercentHeightDescendantsMap->get(this)) {

+ HashSet<RenderBox*>::iterator end = descendants->end();

+ for (HashSet<RenderBox*>::iterator it = descendants->begin(); it != end; ++it) {

+ RenderBox* box = *it;

+ while (box != this) {

+ if (box->normalChildNeedsLayout())

+ break;

+ box->setChildNeedsLayout(true, false);

+ box = box->containingBlock();

+ ASSERT(box);

+ if (!box)

+ break;

+ }

+ int top = borderTop() + paddingTop();

+ int bottom = borderBottom() + paddingBottom() + horizontalScrollbarHeight();

+ m_overflowHeight = top;

+ setHeight(m_overflowHeight);

+ // The margin struct caches all our current margin collapsing state. The compact struct caches state when we encounter compacts,

+ MarginInfo marginInfo(this, top, bottom);

+ // Fieldsets need to find their legend and position it inside the border of the object.

+ // The legend then gets skipped during normal layout.

+ RenderObject* legend = layoutLegend(relayoutChildren);

+ int previousFloatBottom = 0;

+ maxFloatBottom = 0;

+ RenderBox* child = firstChildBox();

+ while (child) {

+ if (legend == child) {

+ child = child->nextSiblingBox();

+ continue; // Skip the legend, since it has already been positioned up in the fieldset's border.

+ }

+ int oldTopPosMargin = maxTopPosMargin();

+ int oldTopNegMargin = maxTopNegMargin();

+ // Make sure we layout children if they need it.

+ // FIXME: Technically percentage height objects only need a relayout if their percentage isn't going to be turned into

+ // an auto value. Add a method to determine this, so that we can avoid the relayout.

+ if (relayoutChildren || ((child->style()->height().isPercent() || child->style()->minHeight().isPercent() || child->style()->maxHeight().isPercent()) && !isRenderView()))

+ child->setChildNeedsLayout(true, false);

+ // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths.

+ if (relayoutChildren && (child->style()->paddingLeft().isPercent() || child->style()->paddingRight().isPercent()))

+ child->setPrefWidthsDirty(true, false);

+ // Handle the four types of special elements first. These include positioned content, floating content, compacts and

+ // run-ins. When we encounter these four types of objects, we don't actually lay them out as normal flow blocks.

+ bool handled = false;

+ RenderBox* next = handleSpecialChild(child, marginInfo, handled);

+ if (handled) {

+ child = next;

+ continue;

+ }

+ // The child is a normal flow object. Compute its vertical margins now.

+ child->calcVerticalMargins();

+ // Do not allow a collapse if the margin top collapse style is set to SEPARATE.

+ if (child->style()->marginTopCollapse() == MSEPARATE) {

+ marginInfo.setAtTopOfBlock(false);

+ marginInfo.clearMargin();

+ }

+ // Try to guess our correct y position. In most cases this guess will

+ // be correct. Only if we're wrong (when we compute the real y position)

+ // will we have to potentially relayout.

+ int yPosEstimate = estimateVerticalPosition(child, marginInfo);

+ // Cache our old rect so that we can dirty the proper repaint rects if the child moves.

+ IntRect oldRect(child->x(), child->y() , child->width(), child->height());

+#ifndef NDEBUG

+ IntSize oldLayoutDelta = view()->layoutDelta();

+#endif

+ // Go ahead and position the child as though it didn't collapse with the top.

+ view()->addLayoutDelta(IntSize(0, child->y() - yPosEstimate));

+ child->setLocation(child->x(), yPosEstimate);

+ bool markDescendantsWithFloats = false;

+ if (yPosEstimate != oldRect.y() && !child->avoidsFloats() && child->containsFloats())

+ markDescendantsWithFloats = true;

+ else if (!child->avoidsFloats() || child->shrinkToAvoidFloats()) {

+ // If an element might be affected by the presence of floats, then always mark it for

+ // layout.

+ int fb = max(previousFloatBottom, floatBottom());

+ if (fb > height() || fb > yPosEstimate)

+ markDescendantsWithFloats = true;

+ }

+ if (child->isRenderBlock()) {

+ if (markDescendantsWithFloats)

+ toRenderBlock(child)->markAllDescendantsWithFloatsForLayout();

+ previousFloatBottom = max(previousFloatBottom, oldRect.y() + toRenderBlock(child)->floatBottom());

+ }

+ bool childHadLayout = child->m_everHadLayout;

+ bool childNeededLayout = child->needsLayout();

+ if (childNeededLayout)

+ child->layout();

+ // Now determine the correct ypos based off examination of collapsing margin

+ // values.

+ collapseMargins(child, marginInfo, yPosEstimate);

+ // Now check for clear.

+ clearFloatsIfNeeded(child, marginInfo, oldTopPosMargin, oldTopNegMargin);

+ // We are no longer at the top of the block if we encounter a non-empty child.

+ // This has to be done after checking for clear, so that margins can be reset if a clear occurred.

+ if (marginInfo.atTopOfBlock() && !child->isSelfCollapsingBlock())

+ marginInfo.setAtTopOfBlock(false);

+ // Now place the child in the correct horizontal position

+ determineHorizontalPosition(child);

+ // Update our height now that the child has been placed in the correct position.

+ setHeight(height() + child->height());

+ if (child->style()->marginBottomCollapse() == MSEPARATE) {

+ setHeight(height() + child->marginBottom());

+ marginInfo.clearMargin();

+ }

+ // If the child has overhanging floats that intrude into following siblings (or possibly out

+ // of this block), then the parent gets notified of the floats now.

+ if (child->containsFloats())

+ maxFloatBottom = max(maxFloatBottom, addOverhangingFloats(toRenderBlock(child), -child->x(), -child->y(), !childNeededLayout));

+ // Update our overflow in case the child spills out the block.

+ m_overflowTop = min(m_overflowTop, child->y() + child->overflowTop(false));

+ m_overflowHeight = max(m_overflowHeight, height() + child->overflowHeight(false) - child->height());

+ m_overflowWidth = max(child->x() + child->overflowWidth(false), m_overflowWidth);

+ m_overflowLeft = min(child->x() + child->overflowLeft(false), m_overflowLeft);

+ IntSize childOffset(child->x() - oldRect.x(), child->y() - oldRect.y());

+ if (childOffset.width() || childOffset.height()) {

+ view()->addLayoutDelta(childOffset);

+ // If the child moved, we have to repaint it as well as any floating/positioned

+ // descendants. An exception is if we need a layout. In this case, we know we're going to

+ // repaint ourselves (and the child) anyway.

+ if (childHadLayout && !selfNeedsLayout() && child->checkForRepaintDuringLayout())

+ child->repaintDuringLayoutIfMoved(oldRect);

+ }

+ if (!childHadLayout && child->checkForRepaintDuringLayout())

+ child->repaint();

+ ASSERT(oldLayoutDelta == view()->layoutDelta());

+ child = child->nextSiblingBox();

+ }

+ // Now do the handling of the bottom of the block, adding in our bottom border/padding and

+ // determining the correct collapsed bottom margin information.

+ handleBottomOfBlock(top, bottom, marginInfo);

+bool RenderBlock::layoutOnlyPositionedObjects()

+ if (!posChildNeedsLayout() || normalChildNeedsLayout() || selfNeedsLayout())

+ return false;

+ LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), hasColumns() || hasTransform() || hasReflection());

+ if (needsPositionedMovementLayout()) {

+ tryLayoutDoingPositionedMovementOnly();

+ if (needsLayout())

+ return false;

+ }

+ // All we have to is lay out our positioned objects.

+ layoutPositionedObjects(false);

+ statePusher.pop();

+ if (hasOverflowClip())

+ layer()->updateScrollInfoAfterLayout();

+ setNeedsLayout(false);

+ return true;

+void RenderBlock::layoutPositionedObjects(bool relayoutChildren)

+ if (m_positionedObjects) {

+ RenderBox* r;

+ Iterator end = m_positionedObjects->end();

+ for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {

+ r = *it;

+ // When a non-positioned block element moves, it may have positioned children that are implicitly positioned relative to the

+ // non-positioned block. Rather than trying to detect all of these movement cases, we just always lay out positioned

+ // objects that are positioned implicitly like this. Such objects are rare, and so in typical DHTML menu usage (where everything is

+ // positioned explicitly) this should not incur a performance penalty.

+ if (relayoutChildren || (r->style()->hasStaticY() && r->parent() != this && r->parent()->isBlockFlow()))

+ r->setChildNeedsLayout(true, false);

+ // If relayoutChildren is set and we have percentage padding, we also need to invalidate the child's pref widths.

+ //if (relayoutChildren && (r->style()->paddingLeft().isPercent() || r->style()->paddingRight().isPercent()))

+ r->setPrefWidthsDirty(true, false);

+ // We don't have to do a full layout. We just have to update our position. Try that first. If we have shrink-to-fit width

+ // and we hit the available width constraint, the layoutIfNeeded() will catch it and do a full layout.

+ if (r->needsPositionedMovementLayoutOnly())

+ r->tryLayoutDoingPositionedMovementOnly();

+ r->layoutIfNeeded();

+ }

+void RenderBlock::markPositionedObjectsForLayout()

+ if (m_positionedObjects) {

+ RenderBox* r;

+ Iterator end = m_positionedObjects->end();

+ for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {

+ r = *it;

+ r->setChildNeedsLayout(true);

+ }

+void RenderBlock::repaintOverhangingFloats(bool paintAllDescendants)

+ // Repaint any overhanging floats (if we know we're the one to paint them).

+ if (hasOverhangingFloats()) {

+ // We think that we must be in a bad state if m_floatingObjects is nil at this point, so

+ // we assert on Debug builds and nil-check Release builds.

+ ASSERT(m_floatingObjects);

+ if (!m_floatingObjects)

+ return;

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ // FIXME: Avoid disabling LayoutState. At the very least, don't disable it for floats originating

+ // in this block. Better yet would be to push extra state for the containers of other floats.

+ view()->disableLayoutState();

+ for ( ; (r = it.current()); ++it) {

+ // Only repaint the object if it is overhanging, is not in its own layer, and

+ // is our responsibility to paint (m_shouldPaint is set). When paintAllDescendants is true, the latter

+ // condition is replaced with being a descendant of us.

+ if (r->m_bottom > height() && (paintAllDescendants && r->m_renderer->isDescendantOf(this) || r->m_shouldPaint) && !r->m_renderer->hasLayer()) {

+ r->m_renderer->repaint();

+ r->m_renderer->repaintOverhangingFloats();

+ }

+ view()->enableLayoutState();

+ }

+void RenderBlock::paint(PaintInfo& paintInfo, int tx, int ty)

+ tx += x();

+ ty += y();

+ PaintPhase phase = paintInfo.phase;

+ // Check if we need to do anything at all.

+ // FIXME: Could eliminate the isRoot() check if we fix background painting so that the RenderView

+ // paints the root's background.

+ if (!isRoot()) {

+ IntRect overflowBox = overflowRect(false);

+ overflowBox.inflate(maximalOutlineSize(paintInfo.phase));

+ overflowBox.move(tx, ty);

+ if (!overflowBox.intersects(paintInfo.rect))

+ return;

+ }

+ bool useControlClip = phase != PaintPhaseBlockBackground && phase != PaintPhaseSelfOutline && phase != PaintPhaseMask && hasControlClip();

+ // Push a clip.

+ if (useControlClip) {

+ if (phase == PaintPhaseOutline)

+ paintInfo.phase = PaintPhaseChildOutlines;

+ else if (phase == PaintPhaseChildBlockBackground) {

+ paintInfo.phase = PaintPhaseBlockBackground;

+ paintObject(paintInfo, tx, ty);

+ paintInfo.phase = PaintPhaseChildBlockBackgrounds;

+ }

+ IntRect clipRect(controlClipRect(tx, ty));

+ if (clipRect.isEmpty())

+ return;

+ paintInfo.context->save();

+ paintInfo.context->clip(clipRect);

+ }

+ paintObject(paintInfo, tx, ty);

+ // Pop the clip.

+ if (useControlClip) {

+ paintInfo.context->restore();

+ if (phase == PaintPhaseOutline) {

+ paintInfo.phase = PaintPhaseSelfOutline;

+ paintObject(paintInfo, tx, ty);

+ paintInfo.phase = phase;

+ } else if (phase == PaintPhaseChildBlockBackground)

+ paintInfo.phase = phase;

+ }

+void RenderBlock::paintColumns(PaintInfo& paintInfo, int tx, int ty, bool paintingFloats)

+ // We need to do multiple passes, breaking up our child painting into strips.

+ GraphicsContext* context = paintInfo.context;

+ int currXOffset = 0;

+ int currYOffset = 0;

+ int ruleAdd = borderLeft() + paddingLeft();

+ int ruleX = 0;

+ int colGap = columnGap();

+ const Color& ruleColor = style()->columnRuleColor();

+ bool ruleTransparent = style()->columnRuleIsTransparent();

+ EBorderStyle ruleStyle = style()->columnRuleStyle();

+ int ruleWidth = style()->columnRuleWidth();

+ bool renderRule = !paintingFloats && ruleStyle > BHIDDEN && !ruleTransparent && ruleWidth <= colGap;

+ Vector<IntRect>* colRects = columnRects();

+ unsigned colCount = colRects->size();

+ for (unsigned i = 0; i < colCount; i++) {

+ // For each rect, we clip to the rect, and then we adjust our coords.

+ IntRect colRect = colRects->at(i);

+ colRect.move(tx, ty);

+ context->save();

+ // Each strip pushes a clip, since column boxes are specified as being

+ // like overflow:hidden.

+ context->clip(colRect);

+ // Adjust tx and ty to change where we paint.

+ PaintInfo info(paintInfo);

+ info.rect.intersect(colRect);

+ // Adjust our x and y when painting.

+ int finalX = tx + currXOffset;

+ int finalY = ty + currYOffset;

+ if (paintingFloats)

+ paintFloats(info, finalX, finalY, paintInfo.phase == PaintPhaseSelection || paintInfo.phase == PaintPhaseTextClip);

+ else

+ paintContents(info, finalX, finalY);

+ // Move to the next position.

+ if (style()->direction() == LTR) {

+ ruleX += colRect.width() + colGap / 2;

+ currXOffset += colRect.width() + colGap;

+ } else {

+ ruleX -= (colRect.width() + colGap / 2);

+ currXOffset -= (colRect.width() + colGap);

+ }

+ currYOffset -= colRect.height();

+ context->restore();

+ // Now paint the column rule.

+ if (renderRule && paintInfo.phase == PaintPhaseForeground && i < colCount - 1) {

+ int ruleStart = ruleX - ruleWidth / 2 + ruleAdd;

+ int ruleEnd = ruleStart + ruleWidth;

+ drawBorder(paintInfo.context, tx + ruleStart, ty + borderTop() + paddingTop(), tx + ruleEnd, ty + borderTop() + paddingTop() + contentHeight(),

+ style()->direction() == LTR ? BSLeft : BSRight, ruleColor, style()->color(), ruleStyle, 0, 0);

+ }

+ ruleX = currXOffset;

+ }

+void RenderBlock::paintContents(PaintInfo& paintInfo, int tx, int ty)

+ // Avoid painting descendants of the root element when stylesheets haven't loaded. This eliminates FOUC.

+ // It's ok not to draw, because later on, when all the stylesheets do load, updateStyleSelector on the Document

+ // will do a full repaint().

+ if (document()->didLayoutWithPendingStylesheets() && !isRenderView())

+ return;

+ if (childrenInline())

+ m_lineBoxes.paint(this, paintInfo, tx, ty);

+ else

+ paintChildren(paintInfo, tx, ty);

+void RenderBlock::paintChildren(PaintInfo& paintInfo, int tx, int ty)

+ PaintPhase newPhase = (paintInfo.phase == PaintPhaseChildOutlines) ? PaintPhaseOutline : paintInfo.phase;

+ newPhase = (newPhase == PaintPhaseChildBlockBackgrounds) ? PaintPhaseChildBlockBackground : newPhase;

+ // We don't paint our own background, but we do let the kids paint their backgrounds.

+ PaintInfo info(paintInfo);

+ info.phase = newPhase;

+ info.paintingRoot = paintingRootForChildren(paintInfo);

+ bool isPrinting = document()->printing();

+ for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {

+ // Check for page-break-before: always, and if it's set, break and bail.

+ if (isPrinting && !childrenInline() && child->style()->pageBreakBefore() == PBALWAYS &&

+ inRootBlockContext() && (ty + child->y()) > paintInfo.rect.y() &&

+ (ty + child->y()) < paintInfo.rect.bottom()) {

+ view()->setBestTruncatedAt(ty + child->y(), this, true);

+ return;

+ }

+ if (!child->hasLayer() && !child->isFloating())

+ child->paint(info, tx, ty);

+ // Check for page-break-after: always, and if it's set, break and bail.

+ if (isPrinting && !childrenInline() && child->style()->pageBreakAfter() == PBALWAYS &&

+ inRootBlockContext() && (ty + child->y() + child->height()) > paintInfo.rect.y() &&

+ (ty + child->y() + child->height()) < paintInfo.rect.bottom()) {

+ view()->setBestTruncatedAt(ty + child->y() + child->height() + max(0, child->collapsedMarginBottom()), this, true);

+ return;

+ }

+void RenderBlock::paintCaret(PaintInfo& paintInfo, int tx, int ty, CaretType type)

+ SelectionController* selection = type == CursorCaret ? document()->frame()->selection() : document()->frame()->dragCaretController();

+ // Ask the SelectionController if the caret should be painted by this block

+ RenderObject* caretPainter = selection->caretRenderer();

+ if (caretPainter == this && selection->isContentEditable()) {

+ // Convert the painting offset into the local coordinate system of this renderer,

+ // to match the localCaretRect computed by the SelectionController

+ offsetForContents(tx, ty);

+ if (type == CursorCaret)

+ document()->frame()->paintCaret(paintInfo.context, tx, ty, paintInfo.rect);

+ else

+ document()->frame()->paintDragCaret(paintInfo.context, tx, ty, paintInfo.rect);

+ }

+void RenderBlock::paintObject(PaintInfo& paintInfo, int tx, int ty)

+ PaintPhase paintPhase = paintInfo.phase;

+ // 1. paint background, borders etc

+ if ((paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) &&

+ hasBoxDecorations() && style()->visibility() == VISIBLE) {

+ paintBoxDecorations(paintInfo, tx, ty);

+ }

+ if (paintPhase == PaintPhaseMask && style()->visibility() == VISIBLE) {

+ paintMask(paintInfo, tx, ty);

+ return;

+ }

+ // We're done. We don't bother painting any children.

+ if (paintPhase == PaintPhaseBlockBackground)

+ return;

+ // Adjust our painting position if we're inside a scrolled layer (e.g., an overflow:auto div).s

+ int scrolledX = tx;

+ int scrolledY = ty;

+ if (hasOverflowClip())

+ layer()->subtractScrolledContentOffset(scrolledX, scrolledY);

+ // 2. paint contents

+ if (paintPhase != PaintPhaseSelfOutline) {

+ if (hasColumns())

+ paintColumns(paintInfo, scrolledX, scrolledY);

+ else

+ paintContents(paintInfo, scrolledX, scrolledY);

+ }

+ // 3. paint selection

+ // FIXME: Make this work with multi column layouts. For now don't fill gaps.

+ bool isPrinting = document()->printing();

+ if (!isPrinting && !hasColumns())

+ paintSelection(paintInfo, scrolledX, scrolledY); // Fill in gaps in selection on lines and between blocks.

+ // 4. paint floats.

+ if (paintPhase == PaintPhaseFloat || paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip) {

+ if (hasColumns())

+ paintColumns(paintInfo, scrolledX, scrolledY, true);

+ else

+ paintFloats(paintInfo, scrolledX, scrolledY, paintPhase == PaintPhaseSelection || paintPhase == PaintPhaseTextClip);

+ }

+ // 5. paint outline.

+ if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseSelfOutline) && hasOutline() && style()->visibility() == VISIBLE)

+ paintOutline(paintInfo.context, tx, ty, width(), height(), style());

+ // 6. paint continuation outlines.

+ if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseChildOutlines)) {

+ if (inlineContinuation() && inlineContinuation()->hasOutline() && inlineContinuation()->style()->visibility() == VISIBLE) {

+ RenderInline* inlineRenderer = toRenderInline(inlineContinuation()->element()->renderer());

+ if (!inlineRenderer->hasLayer())

+ containingBlock()->addContinuationWithOutline(inlineRenderer);

+ else if (!inlineRenderer->firstLineBox())

+ inlineRenderer->paintOutline(paintInfo.context, tx - x() + inlineRenderer->containingBlock()->x(),

+ ty - y() + inlineRenderer->containingBlock()->y());

+ }

+ paintContinuationOutlines(paintInfo, tx, ty);

+ }

+ // 7. paint caret.

+ // If the caret's node's render object's containing block is this block, and the paint action is PaintPhaseForeground,

+ // then paint the caret.

+ if (paintPhase == PaintPhaseForeground) {

+ paintCaret(paintInfo, scrolledX, scrolledY, CursorCaret);

+ paintCaret(paintInfo, scrolledX, scrolledY, DragCaret);

+ }

+void RenderBlock::paintFloats(PaintInfo& paintInfo, int tx, int ty, bool preservePhase)

+ if (!m_floatingObjects)

+ return;

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for (; (r = it.current()); ++it) {

+ // Only paint the object if our m_shouldPaint flag is set.

+ if (r->m_shouldPaint && !r->m_renderer->hasLayer()) {

+ PaintInfo currentPaintInfo(paintInfo);

+ currentPaintInfo.phase = preservePhase ? paintInfo.phase : PaintPhaseBlockBackground;

+ int currentTX = tx + r->m_left - r->m_renderer->x() + r->m_renderer->marginLeft();

+ int currentTY = ty + r->m_top - r->m_renderer->y() + r->m_renderer->marginTop();

+ r->m_renderer->paint(currentPaintInfo, currentTX, currentTY);

+ if (!preservePhase) {

+ currentPaintInfo.phase = PaintPhaseChildBlockBackgrounds;

+ r->m_renderer->paint(currentPaintInfo, currentTX, currentTY);

+ currentPaintInfo.phase = PaintPhaseFloat;

+ r->m_renderer->paint(currentPaintInfo, currentTX, currentTY);

+ currentPaintInfo.phase = PaintPhaseForeground;

+ r->m_renderer->paint(currentPaintInfo, currentTX, currentTY);

+ currentPaintInfo.phase = PaintPhaseOutline;

+ r->m_renderer->paint(currentPaintInfo, currentTX, currentTY);

+ }

+void RenderBlock::paintEllipsisBoxes(PaintInfo& paintInfo, int tx, int ty)

+ if (!shouldPaintWithinRoot(paintInfo) || !firstLineBox())

+ return;

+ if (style()->visibility() == VISIBLE && paintInfo.phase == PaintPhaseForeground) {

+ // We can check the first box and last box and avoid painting if we don't

+ // intersect.

+ int yPos = ty + firstLineBox()->yPos();

+ int h = lastLineBox()->yPos() + lastLineBox()->height() - firstLineBox()->yPos();

+ if (yPos >= paintInfo.rect.bottom() || yPos + h <= paintInfo.rect.y())

+ return;

+ // See if our boxes intersect with the dirty rect. If so, then we paint

+ // them. Note that boxes can easily overlap, so we can't make any assumptions

+ // based off positions of our first line box or our last line box.

+ for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {

+ yPos = ty + curr->yPos();

+ h = curr->height();

+ if (curr->ellipsisBox() && yPos < paintInfo.rect.bottom() && yPos + h > paintInfo.rect.y())

+ curr->paintEllipsisBox(paintInfo, tx, ty);

+ }

+static ContinuationOutlineTableMap* continuationOutlineTable()

+ DEFINE_STATIC_LOCAL(ContinuationOutlineTableMap, table, ());

+ return &table;

+void RenderBlock::addContinuationWithOutline(RenderInline* flow)

+ // We can't make this work if the inline is in a layer. We'll just rely on the broken

+ // way of painting.

+ ASSERT(!flow->layer() && !flow->isInlineContinuation());

+ ContinuationOutlineTableMap* table = continuationOutlineTable();

+ ListHashSet<RenderInline*>* continuations = table->get(this);

+ if (!continuations) {

+ continuations = new ListHashSet<RenderInline*>;

+ table->set(this, continuations);

+ }

+ continuations->add(flow);

+void RenderBlock::paintContinuationOutlines(PaintInfo& info, int tx, int ty)

+ ContinuationOutlineTableMap* table = continuationOutlineTable();

+ if (table->isEmpty())

+ return;

+ ListHashSet<RenderInline*>* continuations = table->get(this);

+ if (!continuations)

+ return;

+ // Paint each continuation outline.

+ ListHashSet<RenderInline*>::iterator end = continuations->end();

+ for (ListHashSet<RenderInline*>::iterator it = continuations->begin(); it != end; ++it) {

+ // Need to add in the coordinates of the intervening blocks.

+ RenderInline* flow = *it;

+ RenderBlock* block = flow->containingBlock();

+ for ( ; block && block != this; block = block->containingBlock()) {

+ tx += block->x();

+ ty += block->y();

+ }

+ ASSERT(block);

+ flow->paintOutline(info.context, tx, ty);

+ }

+ // Delete

+ delete continuations;

+ table->remove(this);

+void RenderBlock::setSelectionState(SelectionState s)

+ if (selectionState() == s)

+ return;

+ if (s == SelectionInside && selectionState() != SelectionNone)

+ return;

+ if ((s == SelectionStart && selectionState() == SelectionEnd) ||

+ (s == SelectionEnd && selectionState() == SelectionStart))

+ RenderBox::setSelectionState(SelectionBoth);

+ else

+ RenderBox::setSelectionState(s);

+ RenderBlock* cb = containingBlock();

+ if (cb && !cb->isRenderView())

+ cb->setSelectionState(s);

+bool RenderBlock::shouldPaintSelectionGaps() const

+ return selectionState() != SelectionNone && style()->visibility() == VISIBLE && isSelectionRoot();

+bool RenderBlock::isSelectionRoot() const

+ if (!element())

+ return false;

+ // FIXME: Eventually tables should have to learn how to fill gaps between cells, at least in simple non-spanning cases.

+ if (isTable())

+ return false;

+ if (isBody() || isRoot() || hasOverflowClip() || isRelPositioned() ||

+ isFloatingOrPositioned() || isTableCell() || isInlineBlockOrInlineTable() || hasTransform() ||

+ hasReflection() || hasMask())

+ return true;

+ if (view() && view()->selectionStart()) {

+ Node* startElement = view()->selectionStart()->element();

+ if (startElement && startElement->rootEditableElement() == element())

+ return true;

+ }

+ return false;

+GapRects RenderBlock::selectionGapRectsForRepaint(RenderBoxModelObject* /*repaintContainer*/)

+ ASSERT(!needsLayout());

+ if (!shouldPaintSelectionGaps())

+ return GapRects();

+ // FIXME: this is broken with transforms and a non-null repaintContainer

+ FloatPoint absContentPoint = localToAbsolute(FloatPoint());

+ if (hasOverflowClip())

+ absContentPoint -= layer()->scrolledContentOffset();

+ int lastTop = 0;

+ int lastLeft = leftSelectionOffset(this, lastTop);

+ int lastRight = rightSelectionOffset(this, lastTop);

+ return fillSelectionGaps(this, absContentPoint.x(), absContentPoint.y(), absContentPoint.x(), absContentPoint.y(), lastTop, lastLeft, lastRight);

+void RenderBlock::paintSelection(PaintInfo& paintInfo, int tx, int ty)

+ if (shouldPaintSelectionGaps() && paintInfo.phase == PaintPhaseForeground) {

+ int lastTop = 0;

+ int lastLeft = leftSelectionOffset(this, lastTop);

+ int lastRight = rightSelectionOffset(this, lastTop);

+ paintInfo.context->save();

+ fillSelectionGaps(this, tx, ty, tx, ty, lastTop, lastLeft, lastRight, &paintInfo);

+ paintInfo.context->restore();

+ }

+static void clipOutPositionedObjects(const RenderObject::PaintInfo* paintInfo, int tx, int ty, ListHashSet<RenderBox*>* positionedObjects)

+ if (!positionedObjects)

+ return;

+ ListHashSet<RenderBox*>::const_iterator end = positionedObjects->end();

+ for (ListHashSet<RenderBox*>::const_iterator it = positionedObjects->begin(); it != end; ++it) {

+ RenderBox* r = *it;

+ paintInfo->context->clipOut(IntRect(tx + r->x(), ty + r->y(), r->width(), r->height()));

+ }

+GapRects RenderBlock::fillSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,

+ int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo)

+ // IMPORTANT: Callers of this method that intend for painting to happen need to do a save/restore.

+ // Clip out floating and positioned objects when painting selection gaps.

+ if (paintInfo) {

+ // Note that we don't clip out overflow for positioned objects. We just stick to the border box.

+ clipOutPositionedObjects(paintInfo, tx, ty, m_positionedObjects);

+ if (isBody() || isRoot()) // The <body> must make sure to examine its containingBlock's positioned objects.

+ for (RenderBlock* cb = containingBlock(); cb && !cb->isRenderView(); cb = cb->containingBlock())

+ clipOutPositionedObjects(paintInfo, cb->x(), cb->y(), cb->m_positionedObjects);

+ if (m_floatingObjects) {

+ for (DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects); it.current(); ++it) {

+ FloatingObject* r = it.current();

+ paintInfo->context->clipOut(IntRect(tx + r->m_left + r->m_renderer->marginLeft(),

+ ty + r->m_top + r->m_renderer->marginTop(),

+ r->m_renderer->width(), r->m_renderer->height()));

+ }

+ // FIXME: overflow: auto/scroll regions need more math here, since painting in the border box is different from painting in the padding box (one is scrolled, the other is

+ // fixed).

+ GapRects result;

+ if (!isBlockFlow()) // FIXME: Make multi-column selection gap filling work someday.

+ return result;

+ if (hasColumns() || hasTransform()) {

+ // FIXME: We should learn how to gap fill multiple columns and transforms eventually.

+ lastTop = (ty - blockY) + height();

+ lastLeft = leftSelectionOffset(rootBlock, height());

+ lastRight = rightSelectionOffset(rootBlock, height());

+ return result;

+ }

+ if (childrenInline())

+ result = fillInlineSelectionGaps(rootBlock, blockX, blockY, tx, ty, lastTop, lastLeft, lastRight, paintInfo);

+ else

+ result = fillBlockSelectionGaps(rootBlock, blockX, blockY, tx, ty, lastTop, lastLeft, lastRight, paintInfo);

+ // Go ahead and fill the vertical gap all the way to the bottom of our block if the selection extends past our block.

+ if (rootBlock == this && (selectionState() != SelectionBoth && selectionState() != SelectionEnd))

+ result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + height(),

+ rootBlock, blockX, blockY, paintInfo));

+ return result;

+GapRects RenderBlock::fillInlineSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,

+ int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo)

+ GapRects result;

+ bool containsStart = selectionState() == SelectionStart || selectionState() == SelectionBoth;

+ if (!firstLineBox()) {

+ if (containsStart) {

+ // Go ahead and update our lastY to be the bottom of the block. <hr>s or empty blocks with height can trip this

+ // case.

+ lastTop = (ty - blockY) + height();

+ lastLeft = leftSelectionOffset(rootBlock, height());

+ lastRight = rightSelectionOffset(rootBlock, height());

+ }

+ return result;

+ }

+ RootInlineBox* lastSelectedLine = 0;

+ RootInlineBox* curr;

+ for (curr = firstRootBox(); curr && !curr->hasSelectedChildren(); curr = curr->nextRootBox()) { }

+ // Now paint the gaps for the lines.

+ for (; curr && curr->hasSelectedChildren(); curr = curr->nextRootBox()) {

+ int selTop = curr->selectionTop();

+ int selHeight = curr->selectionHeight();

+ if (!containsStart && !lastSelectedLine &&

+ selectionState() != SelectionStart && selectionState() != SelectionBoth)

+ result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight, ty + selTop,

+ rootBlock, blockX, blockY, paintInfo));

+ if (!paintInfo || ty + selTop < paintInfo->rect.bottom() && ty + selTop + selHeight > paintInfo->rect.y())

+ result.unite(curr->fillLineSelectionGap(selTop, selHeight, rootBlock, blockX, blockY, tx, ty, paintInfo));

+ lastSelectedLine = curr;

+ }

+ if (containsStart && !lastSelectedLine)

+ // Selection must start just after our last line.

+ lastSelectedLine = lastRootBox();

+ if (lastSelectedLine && selectionState() != SelectionEnd && selectionState() != SelectionBoth) {

+ // Go ahead and update our lastY to be the bottom of the last selected line.

+ lastTop = (ty - blockY) + lastSelectedLine->bottomOverflow();

+ lastLeft = leftSelectionOffset(rootBlock, lastSelectedLine->bottomOverflow());

+ lastRight = rightSelectionOffset(rootBlock, lastSelectedLine->bottomOverflow());

+ }

+ return result;

+GapRects RenderBlock::fillBlockSelectionGaps(RenderBlock* rootBlock, int blockX, int blockY, int tx, int ty,

+ int& lastTop, int& lastLeft, int& lastRight, const PaintInfo* paintInfo)

+ GapRects result;

+ // Go ahead and jump right to the first block child that contains some selected objects.

+ RenderBox* curr;

+ for (curr = firstChildBox(); curr && curr->selectionState() == SelectionNone; curr = curr->nextSiblingBox()) { }

+ for (bool sawSelectionEnd = false; curr && !sawSelectionEnd; curr = curr->nextSiblingBox()) {

+ SelectionState childState = curr->selectionState();

+ if (childState == SelectionBoth || childState == SelectionEnd)

+ sawSelectionEnd = true;

+ if (curr->isFloatingOrPositioned())

+ continue; // We must be a normal flow object in order to even be considered.

+ if (curr->isRelPositioned() && curr->hasLayer()) {

+ // If the relposition offset is anything other than 0, then treat this just like an absolute positioned element.

+ // Just disregard it completely.

+ IntSize relOffset = curr->layer()->relativePositionOffset();

+ if (relOffset.width() || relOffset.height())

+ continue;

+ }

+ bool paintsOwnSelection = curr->shouldPaintSelectionGaps() || curr->isTable(); // FIXME: Eventually we won't special-case table like this.

+ bool fillBlockGaps = paintsOwnSelection || (curr->canBeSelectionLeaf() && childState != SelectionNone);

+ if (fillBlockGaps) {

+ // We need to fill the vertical gap above this object.

+ if (childState == SelectionEnd || childState == SelectionInside)

+ // Fill the gap above the object.

+ result.uniteCenter(fillVerticalSelectionGap(lastTop, lastLeft, lastRight,

+ ty + curr->y(), rootBlock, blockX, blockY, paintInfo));

+ // Only fill side gaps for objects that paint their own selection if we know for sure the selection is going to extend all the way *past*

+ // our object. We know this if the selection did not end inside our object.

+ if (paintsOwnSelection && (childState == SelectionStart || sawSelectionEnd))

+ childState = SelectionNone;

+ // Fill side gaps on this object based off its state.

+ bool leftGap, rightGap;

+ getHorizontalSelectionGapInfo(childState, leftGap, rightGap);

+ if (leftGap)

+ result.uniteLeft(fillLeftSelectionGap(this, curr->x(), curr->y(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo));

+ if (rightGap)

+ result.uniteRight(fillRightSelectionGap(this, curr->x() + curr->width(), curr->y(), curr->height(), rootBlock, blockX, blockY, tx, ty, paintInfo));

+ // Update lastTop to be just underneath the object. lastLeft and lastRight extend as far as

+ // they can without bumping into floating or positioned objects. Ideally they will go right up

+ // to the border of the root selection block.

+ lastTop = (ty - blockY) + (curr->y() + curr->height());

+ lastLeft = leftSelectionOffset(rootBlock, curr->y() + curr->height());

+ lastRight = rightSelectionOffset(rootBlock, curr->y() + curr->height());

+ } else if (childState != SelectionNone)

+ // We must be a block that has some selected object inside it. Go ahead and recur.

+ result.unite(toRenderBlock(curr)->fillSelectionGaps(rootBlock, blockX, blockY, tx + curr->x(), ty + curr->y(),

+ lastTop, lastLeft, lastRight, paintInfo));

+ }

+ return result;

+IntRect RenderBlock::fillHorizontalSelectionGap(RenderObject* selObj, int xPos, int yPos, int width, int height, const PaintInfo* paintInfo)

+ if (width <= 0 || height <= 0)

+ return IntRect();

+ IntRect gapRect(xPos, yPos, width, height);

+ if (paintInfo && selObj->style()->visibility() == VISIBLE)

+ paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor());

+ return gapRect;

+IntRect RenderBlock::fillVerticalSelectionGap(int lastTop, int lastLeft, int lastRight, int bottomY, RenderBlock* rootBlock,

+ int blockX, int blockY, const PaintInfo* paintInfo)

+ int top = blockY + lastTop;

+ int height = bottomY - top;

+ if (height <= 0)

+ return IntRect();

+ // Get the selection offsets for the bottom of the gap

+ int left = blockX + max(lastLeft, leftSelectionOffset(rootBlock, bottomY));

+ int right = blockX + min(lastRight, rightSelectionOffset(rootBlock, bottomY));

+ int width = right - left;

+ if (width <= 0)

+ return IntRect();

+ IntRect gapRect(left, top, width, height);

+ if (paintInfo)

+ paintInfo->context->fillRect(gapRect, selectionBackgroundColor());

+ return gapRect;

+IntRect RenderBlock::fillLeftSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock,

+ int blockX, int /*blockY*/, int tx, int ty, const PaintInfo* paintInfo)

+ int top = yPos + ty;

+ int left = blockX + max(leftSelectionOffset(rootBlock, yPos), leftSelectionOffset(rootBlock, yPos + height));

+ int right = min(xPos + tx, blockX + min(rightSelectionOffset(rootBlock, yPos), rightSelectionOffset(rootBlock, yPos + height)));

+ int width = right - left;

+ if (width <= 0)

+ return IntRect();

+ IntRect gapRect(left, top, width, height);

+ if (paintInfo)

+ paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor());

+ return gapRect;

+IntRect RenderBlock::fillRightSelectionGap(RenderObject* selObj, int xPos, int yPos, int height, RenderBlock* rootBlock,

+ int blockX, int /*blockY*/, int tx, int ty, const PaintInfo* paintInfo)

+ int left = max(xPos + tx, blockX + max(leftSelectionOffset(rootBlock, yPos), leftSelectionOffset(rootBlock, yPos + height)));

+ int top = yPos + ty;

+ int right = blockX + min(rightSelectionOffset(rootBlock, yPos), rightSelectionOffset(rootBlock, yPos + height));

+ int width = right - left;

+ if (width <= 0)

+ return IntRect();

+ IntRect gapRect(left, top, width, height);

+ if (paintInfo)

+ paintInfo->context->fillRect(gapRect, selObj->selectionBackgroundColor());

+ return gapRect;

+void RenderBlock::getHorizontalSelectionGapInfo(SelectionState state, bool& leftGap, bool& rightGap)

+ bool ltr = style()->direction() == LTR;

+ leftGap = (state == RenderObject::SelectionInside) ||

+ (state == RenderObject::SelectionEnd && ltr) ||

+ (state == RenderObject::SelectionStart && !ltr);

+ rightGap = (state == RenderObject::SelectionInside) ||

+ (state == RenderObject::SelectionStart && ltr) ||

+ (state == RenderObject::SelectionEnd && !ltr);

+int RenderBlock::leftSelectionOffset(RenderBlock* rootBlock, int yPos)

+ int left = leftOffset(yPos, false);

+ if (left == borderLeft() + paddingLeft()) {

+ if (rootBlock != this)

+ // The border can potentially be further extended by our containingBlock().

+ return containingBlock()->leftSelectionOffset(rootBlock, yPos + y());

+ return left;

+ }

+ else {

+ RenderBlock* cb = this;

+ while (cb != rootBlock) {

+ left += cb->x();

+ cb = cb->containingBlock();

+ }

+ return left;

+int RenderBlock::rightSelectionOffset(RenderBlock* rootBlock, int yPos)

+ int right = rightOffset(yPos, false);

+ if (right == (contentWidth() + (borderLeft() + paddingLeft()))) {

+ if (rootBlock != this)

+ // The border can potentially be further extended by our containingBlock().

+ return containingBlock()->rightSelectionOffset(rootBlock, yPos + y());

+ return right;

+ }

+ else {

+ RenderBlock* cb = this;

+ while (cb != rootBlock) {

+ right += cb->x();

+ cb = cb->containingBlock();

+ }

+ return right;

+void RenderBlock::insertPositionedObject(RenderBox* o)

+ // Create the list of special objects if we don't aleady have one

+ if (!m_positionedObjects)

+ m_positionedObjects = new ListHashSet<RenderBox*>;

+ m_positionedObjects->add(o);

+void RenderBlock::removePositionedObject(RenderBox* o)

+ if (m_positionedObjects)

+ m_positionedObjects->remove(o);

+void RenderBlock::removePositionedObjects(RenderBlock* o)

+ if (!m_positionedObjects)

+ return;

+ RenderBox* r;

+ Iterator end = m_positionedObjects->end();

+ Vector<RenderBox*, 16> deadObjects;

+ for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {

+ r = *it;

+ if (!o || r->isDescendantOf(o)) {

+ if (o)

+ r->setChildNeedsLayout(true, false);

+ // It is parent blocks job to add positioned child to positioned objects list of its containing block

+ // Parent layout needs to be invalidated to ensure this happens.

+ RenderObject* p = r->parent();

+ while (p && !p->isRenderBlock())

+ p = p->parent();

+ if (p)

+ p->setChildNeedsLayout(true);

+ deadObjects.append(r);

+ }

+ for (unsigned i = 0; i < deadObjects.size(); i++)

+ m_positionedObjects->remove(deadObjects.at(i));

+void RenderBlock::insertFloatingObject(RenderBox* o)

+ ASSERT(o->isFloating());

+ // Create the list of special objects if we don't aleady have one

+ if (!m_floatingObjects) {

+ m_floatingObjects = new DeprecatedPtrList<FloatingObject>;

+ m_floatingObjects->setAutoDelete(true);

+ } else {

+ // Don't insert the object again if it's already in the list

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ FloatingObject* f;

+ while ( (f = it.current()) ) {

+ if (f->m_renderer == o) return;

+ ++it;

+ }

+ // Create the special object entry & append it to the list

+ o->layoutIfNeeded();

+ FloatingObject* newObj = new FloatingObject(o->style()->floating() == FLEFT ? FloatingObject::FloatLeft : FloatingObject::FloatRight);

+ newObj->m_top = -1;

+ newObj->m_bottom = -1;

+ newObj->m_width = o->width() + o->marginLeft() + o->marginRight();

+ newObj->m_shouldPaint = !o->hasLayer(); // If a layer exists, the float will paint itself. Otherwise someone else will.

+ newObj->m_isDescendant = true;

+ newObj->m_renderer = o;

+ m_floatingObjects->append(newObj);

+void RenderBlock::removeFloatingObject(RenderBox* o)

+ if (m_floatingObjects) {

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ while (it.current()) {

+ if (it.current()->m_renderer == o) {

+ if (childrenInline())

+ markLinesDirtyInVerticalRange(0, it.current()->m_bottom);

+ m_floatingObjects->removeRef(it.current());

+ }

+ ++it;

+ }

+bool RenderBlock::positionNewFloats()

+ if (!m_floatingObjects)

+ return false;

+ FloatingObject* f = m_floatingObjects->last();

+ // If all floats have already been positioned, then we have no work to do.

+ if (!f || f->m_top != -1)

+ return false;

+ // Move backwards through our floating object list until we find a float that has

+ // already been positioned. Then we'll be able to move forward, positioning all of

+ // the new floats that need it.

+ FloatingObject* lastFloat = m_floatingObjects->getPrev();

+ while (lastFloat && lastFloat->m_top == -1) {

+ f = m_floatingObjects->prev();

+ lastFloat = m_floatingObjects->getPrev();

+ }

+ int y = height();

+ // The float cannot start above the y position of the last positioned float.

+ if (lastFloat)

+ y = max(lastFloat->m_top, y);

+ // Now walk through the set of unpositioned floats and place them.

+ while (f) {

+ // The containing block is responsible for positioning floats, so if we have floats in our

+ // list that come from somewhere else, do not attempt to position them.

+ if (f->m_renderer->containingBlock() != this) {

+ f = m_floatingObjects->next();

+ continue;

+ }

+ RenderBox* o = f->m_renderer;

+ int _height = o->height() + o->marginTop() + o->marginBottom();

+ int ro = rightOffset(); // Constant part of right offset.

+ int lo = leftOffset(); // Constat part of left offset.

+ int fwidth = f->m_width; // The width we look for.

+ if (ro - lo < fwidth)

+ fwidth = ro - lo; // Never look for more than what will be available.

+ IntRect oldRect(o->x(), o->y() , o->width(), o->height());

+ if (o->style()->clear() & CLEFT)

+ y = max(leftBottom(), y);

+ if (o->style()->clear() & CRIGHT)

+ y = max(rightBottom(), y);

+ if (o->style()->floating() == FLEFT) {

+ int heightRemainingLeft = 1;

+ int heightRemainingRight = 1;

+ int fx = leftRelOffset(y,lo, false, &heightRemainingLeft);

+ while (rightRelOffset(y,ro, false, &heightRemainingRight)-fx < fwidth) {

+ y += min(heightRemainingLeft, heightRemainingRight);

+ fx = leftRelOffset(y,lo, false, &heightRemainingLeft);

+ }

+ fx = max(0, fx);

+ f->m_left = fx;

+ o->setLocation(fx + o->marginLeft(), y + o->marginTop());

+ } else {

+ int heightRemainingLeft = 1;

+ int heightRemainingRight = 1;

+ int fx = rightRelOffset(y,ro, false, &heightRemainingRight);

+ while (fx - leftRelOffset(y,lo, false, &heightRemainingLeft) < fwidth) {

+ y += min(heightRemainingLeft, heightRemainingRight);

+ fx = rightRelOffset(y, ro, false, &heightRemainingRight);

+ }

+ f->m_left = fx - f->m_width;

+ o->setLocation(fx - o->marginRight() - o->width(), y + o->marginTop());

+ }

+ f->m_top = y;

+ f->m_bottom = f->m_top + _height;

+ // If the child moved, we have to repaint it.

+ if (o->checkForRepaintDuringLayout())

+ o->repaintDuringLayoutIfMoved(oldRect);

+ f = m_floatingObjects->next();

+ }

+ return true;

+void RenderBlock::newLine(EClear clear)

+ positionNewFloats();

+ // set y position

+ int newY = 0;

+ switch(clear)

+ {

+ case CLEFT:

+ newY = leftBottom();

+ break;

+ case CRIGHT:

+ newY = rightBottom();

+ break;

+ case CBOTH:

+ newY = floatBottom();

+ default:

+ break;

+ }

+ if (height() < newY)

+ setHeight(newY);

+void RenderBlock::addPercentHeightDescendant(RenderBox* descendant)

+ if (!gPercentHeightDescendantsMap) {

+ gPercentHeightDescendantsMap = new PercentHeightDescendantsMap;

+ gPercentHeightContainerMap = new PercentHeightContainerMap;

+ }

+ HashSet<RenderBox*>* descendantSet = gPercentHeightDescendantsMap->get(this);

+ if (!descendantSet) {

+ descendantSet = new HashSet<RenderBox*>;

+ gPercentHeightDescendantsMap->set(this, descendantSet);

+ }

+ bool added = descendantSet->add(descendant).second;

+ if (!added) {

+ ASSERT(gPercentHeightContainerMap->get(descendant));

+ ASSERT(gPercentHeightContainerMap->get(descendant)->contains(this));

+ return;

+ }

+ HashSet<RenderBlock*>* containerSet = gPercentHeightContainerMap->get(descendant);

+ if (!containerSet) {

+ containerSet = new HashSet<RenderBlock*>;

+ gPercentHeightContainerMap->set(descendant, containerSet);

+ }

+ ASSERT(!containerSet->contains(this));

+ containerSet->add(this);

+void RenderBlock::removePercentHeightDescendant(RenderBox* descendant)

+ if (!gPercentHeightContainerMap)

+ return;

+ HashSet<RenderBlock*>* containerSet = gPercentHeightContainerMap->take(descendant);

+ if (!containerSet)

+ return;

+ HashSet<RenderBlock*>::iterator end = containerSet->end();

+ for (HashSet<RenderBlock*>::iterator it = containerSet->begin(); it != end; ++it) {

+ RenderBlock* container = *it;

+ HashSet<RenderBox*>* descendantSet = gPercentHeightDescendantsMap->get(container);

+ ASSERT(descendantSet);

+ if (!descendantSet)

+ continue;

+ ASSERT(descendantSet->contains(descendant));

+ descendantSet->remove(descendant);

+ if (descendantSet->isEmpty()) {

+ gPercentHeightDescendantsMap->remove(container);

+ delete descendantSet;

+ }

+ delete containerSet;

+int RenderBlock::leftOffset() const

+ return borderLeft() + paddingLeft();

+int RenderBlock::leftRelOffset(int y, int fixedOffset, bool applyTextIndent, int* heightRemaining) const

+ int left = fixedOffset;

+ if (m_floatingObjects) {

+ if ( heightRemaining ) *heightRemaining = 1;

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for ( ; (r = it.current()); ++it )

+ {

+ if (r->m_top <= y && r->m_bottom > y &&

+ r->type() == FloatingObject::FloatLeft &&

+ r->m_left + r->m_width > left) {

+ left = r->m_left + r->m_width;

+ if ( heightRemaining ) *heightRemaining = r->m_bottom - y;

+ }

+ if (applyTextIndent && style()->direction() == LTR) {

+ int cw = 0;

+ if (style()->textIndent().isPercent())

+ cw = containingBlock()->availableWidth();

+ left += style()->textIndent().calcMinValue(cw);

+ }

+ return left;

+int RenderBlock::rightOffset() const

+ return borderLeft() + paddingLeft() + availableWidth();

+int RenderBlock::rightRelOffset(int y, int fixedOffset, bool applyTextIndent, int* heightRemaining) const

+ int right = fixedOffset;

+ if (m_floatingObjects) {

+ if (heightRemaining) *heightRemaining = 1;

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for ( ; (r = it.current()); ++it )

+ {

+ if (r->m_top <= y && r->m_bottom > y &&

+ r->type() == FloatingObject::FloatRight &&

+ r->m_left < right) {

+ right = r->m_left;

+ if ( heightRemaining ) *heightRemaining = r->m_bottom - y;

+ }

+ if (applyTextIndent && style()->direction() == RTL) {

+ int cw = 0;

+ if (style()->textIndent().isPercent())

+ cw = containingBlock()->availableWidth();

+ right -= style()->textIndent().calcMinValue(cw);

+ }

+ return right;

+int

+RenderBlock::lineWidth(int y, bool firstLine) const

+ int result = rightOffset(y, firstLine) - leftOffset(y, firstLine);

+ return (result < 0) ? 0 : result;

+int RenderBlock::nextFloatBottomBelow(int height) const

+ if (!m_floatingObjects)

+ return 0;

+ int bottom = INT_MAX;

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for ( ; (r = it.current()); ++it) {

+ if (r->m_bottom > height)

+ bottom = min(r->m_bottom, bottom);

+ }

+ return bottom == INT_MAX ? 0 : bottom;

+int

+RenderBlock::floatBottom() const

+ if (!m_floatingObjects) return 0;

+ int bottom=0;

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for ( ; (r = it.current()); ++it )

+ if (r->m_bottom>bottom)

+ bottom=r->m_bottom;

+ return bottom;

+IntRect RenderBlock::floatRect() const

+ IntRect result;

+ if (!m_floatingObjects || hasOverflowClip())

+ return result;

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for (; (r = it.current()); ++it) {

+ if (r->m_shouldPaint && !r->m_renderer->hasLayer()) {

+ IntRect childRect = r->m_renderer->overflowRect(false);

+ childRect.move(r->m_left + r->m_renderer->marginLeft(), r->m_top + r->m_renderer->marginTop());

+ result.unite(childRect);

+ }

+ return result;

+int RenderBlock::lowestPosition(bool includeOverflowInterior, bool includeSelf) const

+ if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip()))

+ return includeSelf && width() > 0 ? overflowHeight(false) : 0;

+ int bottom = includeSelf && width() > 0 ? height() : 0;

+ if (!hasColumns()) {

+ // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids.

+ // For now, we have to descend into all the children, since we may have a huge abs div inside

+ // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to

+ // the abs div.

+ for (RenderObject* c = firstChild(); c; c = c->nextSibling()) {

+ if (!c->isFloatingOrPositioned() && !c->isText() && !c->isRenderInline())

+ bottom = max(bottom, toRenderBox(c)->y() + c->lowestPosition(false));

+ }

+ if (includeSelf && isRelPositioned())

+ bottom += relativePositionOffsetY();

+ if (!includeOverflowInterior && hasOverflowClip())

+ return bottom;

+ int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetY() : 0;

+ if (includeSelf)

+ bottom = max(bottom, m_overflowHeight + relativeOffset);

+ if (m_positionedObjects) {

+ RenderBox* r;

+ Iterator end = m_positionedObjects->end();

+ for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {

+ r = *it;

+ // Fixed positioned objects do not scroll and thus should not constitute

+ // part of the lowest position.

+ if (r->style()->position() != FixedPosition) {

+ // FIXME: Should work for overflow sections too.

+ // If a positioned object lies completely to the left of the root it will be unreachable via scrolling.

+ // Therefore we should not allow it to contribute to the lowest position.

+ if (!isRenderView() || r->x() + r->width() > 0 || r->x() + r->rightmostPosition(false) > 0) {

+ int lp = r->y() + r->lowestPosition(false);

+ bottom = max(bottom, lp + relativeOffset);

+ }

+ if (hasColumns()) {

+ Vector<IntRect>* colRects = columnRects();

+ for (unsigned i = 0; i < colRects->size(); i++)

+ bottom = max(bottom, colRects->at(i).bottom() + relativeOffset);

+ return bottom;

+ }

+ if (m_floatingObjects) {

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for ( ; (r = it.current()); ++it ) {

+ if (r->m_shouldPaint || r->m_renderer->hasLayer()) {

+ int lp = r->m_top + r->m_renderer->marginTop() + r->m_renderer->lowestPosition(false);

+ bottom = max(bottom, lp + relativeOffset);

+ }

+ if (!includeSelf && lastLineBox()) {

+ int lp = lastLineBox()->yPos() + lastLineBox()->height();

+ bottom = max(bottom, lp);

+ }

+ return bottom;

+int RenderBlock::rightmostPosition(bool includeOverflowInterior, bool includeSelf) const

+ if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip()))

+ return includeSelf && height() > 0 ? overflowWidth(false) : 0;

+ int right = includeSelf && height() > 0 ? width() : 0;

+ if (!hasColumns()) {

+ // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids.

+ // For now, we have to descend into all the children, since we may have a huge abs div inside

+ // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to

+ // the abs div.

+ for (RenderObject* c = firstChild(); c; c = c->nextSibling()) {

+ if (!c->isFloatingOrPositioned() && c->isBox() && !c->isRenderInline())

+ right = max(right, toRenderBox(c)->x() + c->rightmostPosition(false));

+ }

+ if (includeSelf && isRelPositioned())

+ right += relativePositionOffsetX();

+ if (!includeOverflowInterior && hasOverflowClip())

+ return right;

+ int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetX() : 0;

+ if (includeSelf)

+ right = max(right, m_overflowWidth + relativeOffset);

+ if (m_positionedObjects) {

+ RenderBox* r;

+ Iterator end = m_positionedObjects->end();

+ for (Iterator it = m_positionedObjects->begin() ; it != end; ++it) {

+ r = *it;

+ // Fixed positioned objects do not scroll and thus should not constitute

+ // part of the rightmost position.

+ if (r->style()->position() != FixedPosition) {

+ // FIXME: Should work for overflow sections too.

+ // If a positioned object lies completely above the root it will be unreachable via scrolling.

+ // Therefore we should not allow it to contribute to the rightmost position.

+ if (!isRenderView() || r->y() + r->height() > 0 || r->y() + r->lowestPosition(false) > 0) {

+ int rp = r->x() + r->rightmostPosition(false);

+ right = max(right, rp + relativeOffset);

+ }

+ if (hasColumns()) {

+ // This only matters for LTR

+ if (style()->direction() == LTR)

+ right = max(columnRects()->last().right() + relativeOffset, right);

+ return right;

+ }

+ if (m_floatingObjects) {

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for ( ; (r = it.current()); ++it ) {

+ if (r->m_shouldPaint || r->m_renderer->hasLayer()) {

+ int rp = r->m_left + r->m_renderer->marginLeft() + r->m_renderer->rightmostPosition(false);

+ right = max(right, rp + relativeOffset);

+ }

+ if (!includeSelf && firstLineBox()) {

+ for (InlineRunBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox()) {

+ int rp = currBox->xPos() + currBox->width();

+ // If this node is a root editable element, then the rightmostPosition should account for a caret at the end.

+ // FIXME: Need to find another way to do this, since scrollbars could show when we don't want them to.

+ if (node()->isContentEditable() && node() == node()->rootEditableElement() && style()->direction() == LTR)

+ rp += 1;

+ right = max(right, rp);

+ }

+ return right;

+int RenderBlock::leftmostPosition(bool includeOverflowInterior, bool includeSelf) const

+ if (!includeOverflowInterior && (hasOverflowClip() || hasControlClip()))

+ return includeSelf && height() > 0 ? overflowLeft(false) : width();

+ int left = includeSelf && height() > 0 ? 0 : width();

+ if (!hasColumns()) {

+ // FIXME: Come up with a way to use the layer tree to avoid visiting all the kids.

+ // For now, we have to descend into all the children, since we may have a huge abs div inside

+ // a tiny rel div buried somewhere deep in our child tree. In this case we have to get to

+ // the abs div.

+ for (RenderObject* c = firstChild(); c; c = c->nextSibling()) {

+ if (!c->isFloatingOrPositioned() && c->isBox() && !c->isRenderInline())

+ left = min(left, toRenderBox(c)->x() + c->leftmostPosition(false));

+ }

+ if (includeSelf && isRelPositioned())

+ left += relativePositionOffsetX();

+ if (!includeOverflowInterior && hasOverflowClip())

+ return left;

+ int relativeOffset = includeSelf && isRelPositioned() ? relativePositionOffsetX() : 0;

+ if (includeSelf)

+ left = min(left, m_overflowLeft + relativeOffset);

+ if (m_positionedObjects) {

+ RenderBox* r;

+ Iterator end = m_positionedObjects->end();

+ for (Iterator it = m_positionedObjects->begin(); it != end; ++it) {

+ r = *it;

+ // Fixed positioned objects do not scroll and thus should not constitute

+ // part of the leftmost position.

+ if (r->style()->position() != FixedPosition) {

+ // FIXME: Should work for overflow sections too.

+ // If a positioned object lies completely above the root it will be unreachable via scrolling.

+ // Therefore we should not allow it to contribute to the leftmost position.

+ if (!isRenderView() || r->y() + r->height() > 0 || r->y() + r->lowestPosition(false) > 0) {

+ int lp = r->x() + r->leftmostPosition(false);

+ left = min(left, lp + relativeOffset);

+ }

+ if (hasColumns()) {

+ // This only matters for RTL

+ if (style()->direction() == RTL)

+ left = min(columnRects()->last().x() + relativeOffset, left);

+ return left;

+ }

+ if (m_floatingObjects) {

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for ( ; (r = it.current()); ++it ) {

+ if (r->m_shouldPaint || r->m_renderer->hasLayer()) {

+ int lp = r->m_left + r->m_renderer->marginLeft() + r->m_renderer->leftmostPosition(false);

+ left = min(left, lp + relativeOffset);

+ }

+ if (!includeSelf && firstLineBox()) {

+ for (InlineRunBox* currBox = firstLineBox(); currBox; currBox = currBox->nextLineBox())

+ left = min(left, (int)currBox->xPos());

+ }

+ return left;

+int

+RenderBlock::leftBottom()

+ if (!m_floatingObjects) return 0;

+ int bottom=0;

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for ( ; (r = it.current()); ++it )

+ if (r->m_bottom > bottom && r->type() == FloatingObject::FloatLeft)

+ bottom=r->m_bottom;

+ return bottom;

+int

+RenderBlock::rightBottom()

+ if (!m_floatingObjects) return 0;

+ int bottom=0;

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for ( ; (r = it.current()); ++it )

+ if (r->m_bottom>bottom && r->type() == FloatingObject::FloatRight)

+ bottom=r->m_bottom;

+ return bottom;

+void RenderBlock::markLinesDirtyInVerticalRange(int top, int bottom)

+ if (top >= bottom)

+ return;

+ RootInlineBox* lowestDirtyLine = lastRootBox();

+ RootInlineBox* afterLowest = lowestDirtyLine;

+ while (lowestDirtyLine && lowestDirtyLine->blockHeight() >= bottom) {

+ afterLowest = lowestDirtyLine;

+ lowestDirtyLine = lowestDirtyLine->prevRootBox();

+ }

+ while (afterLowest && afterLowest->blockHeight() >= top) {

+ afterLowest->markDirty();

+ afterLowest = afterLowest->prevRootBox();

+ }

+void RenderBlock::clearFloats()

+ // Inline blocks are covered by the isReplaced() check in the avoidFloats method.

+ if (avoidsFloats() || isRoot() || isRenderView() || isFloatingOrPositioned() || isTableCell()) {

+ if (m_floatingObjects)

+ m_floatingObjects->clear();

+ return;

+ }

+ typedef HashMap<RenderObject*, FloatingObject*> RendererToFloatInfoMap;

+ RendererToFloatInfoMap floatMap;

+ if (m_floatingObjects) {

+ if (childrenInline()) {

+ m_floatingObjects->first();

+ while (FloatingObject* f = m_floatingObjects->take())

+ floatMap.add(f->m_renderer, f);

+ } else

+ m_floatingObjects->clear();

+ }

+ // Attempt to locate a previous sibling with overhanging floats. We skip any elements that are

+ // out of flow (like floating/positioned elements), and we also skip over any objects that may have shifted

+ // to avoid floats.

+ bool parentHasFloats = false;

+ RenderObject* prev = previousSibling();

+ while (prev && (!prev->isBox() || !prev->isRenderBlock() || prev->avoidsFloats() || prev->isFloatingOrPositioned())) {

+ if (prev->isFloating())

+ parentHasFloats = true;

+ prev = prev->previousSibling();

+ }

+ // First add in floats from the parent.

+ int offset = y();

+ if (parentHasFloats) {

+ RenderBlock* parentBlock = toRenderBlock(parent());

+ addIntrudingFloats(parentBlock, parentBlock->borderLeft() + parentBlock->paddingLeft(), offset);

+ }

+ int xoffset = 0;

+ if (prev)

+ offset -= toRenderBox(prev)->y();

+ else if (parent()->isBox()) {

+ prev = parent();

+ xoffset += toRenderBox(prev)->borderLeft() + toRenderBox(prev)->paddingLeft();

+ }

+ // Add overhanging floats from the previous RenderBlock, but only if it has a float that intrudes into our space.

+ if (!prev || !prev->isRenderBlock())

+ return;

+ RenderBlock* block = toRenderBlock(prev);

+ if (block->m_floatingObjects && block->floatBottom() > offset)

+ addIntrudingFloats(block, xoffset, offset);

+ if (childrenInline()) {

+ int changeTop = INT_MAX;

+ int changeBottom = INT_MIN;

+ if (m_floatingObjects) {

+ for (FloatingObject* f = m_floatingObjects->first(); f; f = m_floatingObjects->next()) {

+ FloatingObject* oldFloatingObject = floatMap.get(f->m_renderer);

+ if (oldFloatingObject) {

+ if (f->m_width != oldFloatingObject->m_width || f->m_left != oldFloatingObject->m_left) {

+ changeTop = 0;

+ changeBottom = max(changeBottom, max(f->m_bottom, oldFloatingObject->m_bottom));

+ } else if (f->m_bottom != oldFloatingObject->m_bottom) {

+ changeTop = min(changeTop, min(f->m_bottom, oldFloatingObject->m_bottom));

+ changeBottom = max(changeBottom, max(f->m_bottom, oldFloatingObject->m_bottom));

+ }

+ floatMap.remove(f->m_renderer);

+ delete oldFloatingObject;

+ } else {

+ changeTop = 0;

+ changeBottom = max(changeBottom, f->m_bottom);

+ }

+ RendererToFloatInfoMap::iterator end = floatMap.end();

+ for (RendererToFloatInfoMap::iterator it = floatMap.begin(); it != end; ++it) {

+ FloatingObject* floatingObject = (*it).second;

+ if (!floatingObject->m_isDescendant) {

+ changeTop = 0;

+ changeBottom = max(changeBottom, floatingObject->m_bottom);

+ }

+ deleteAllValues(floatMap);

+ markLinesDirtyInVerticalRange(changeTop, changeBottom);

+ }

+int RenderBlock::addOverhangingFloats(RenderBlock* child, int xoff, int yoff, bool makeChildPaintOtherFloats)

+ // Prevent floats from being added to the canvas by the root element, e.g., <html>.

+ if (child->hasOverflowClip() || !child->containsFloats() || child->isRoot())

+ return 0;

+ int lowestFloatBottom = 0;

+ // Floats that will remain the child's responsiblity to paint should factor into its

+ // visual overflow.

+ IntRect floatsOverflowRect;

+ DeprecatedPtrListIterator<FloatingObject> it(*child->m_floatingObjects);

+ for (FloatingObject* r; (r = it.current()); ++it) {

+ int bottom = child->y() + r->m_bottom;

+ lowestFloatBottom = max(lowestFloatBottom, bottom);

+ if (bottom > height()) {

+ // If the object is not in the list, we add it now.

+ if (!containsFloat(r->m_renderer)) {

+ FloatingObject *floatingObj = new FloatingObject(r->type());

+ floatingObj->m_top = r->m_top - yoff;

+ floatingObj->m_bottom = r->m_bottom - yoff;

+ floatingObj->m_left = r->m_left - xoff;

+ floatingObj->m_width = r->m_width;

+ floatingObj->m_renderer = r->m_renderer;

+ // The nearest enclosing layer always paints the float (so that zindex and stacking

+ // behaves properly). We always want to propagate the desire to paint the float as

+ // far out as we can, to the outermost block that overlaps the float, stopping only

+ // if we hit a layer boundary.

+ if (r->m_renderer->enclosingLayer() == enclosingLayer())

+ r->m_shouldPaint = false;

+ else

+ floatingObj->m_shouldPaint = false;

+ // We create the floating object list lazily.

+ if (!m_floatingObjects) {

+ m_floatingObjects = new DeprecatedPtrList<FloatingObject>;

+ m_floatingObjects->setAutoDelete(true);

+ }

+ m_floatingObjects->append(floatingObj);

+ }

+ } else if (makeChildPaintOtherFloats && !r->m_shouldPaint && !r->m_renderer->hasLayer() && r->m_renderer->isDescendantOf(child) && r->m_renderer->enclosingLayer() == child->enclosingLayer())

+ // The float is not overhanging from this block, so if it is a descendant of the child, the child should

+ // paint it (the other case is that it is intruding into the child), unless it has its own layer or enclosing

+ // layer.

+ // If makeChildPaintOtherFloats is false, it means that the child must already know about all the floats

+ // it should paint.

+ r->m_shouldPaint = true;

+ if (r->m_shouldPaint && !r->m_renderer->hasLayer()) {

+ IntRect floatOverflowRect = r->m_renderer->overflowRect(false);

+ floatOverflowRect.move(r->m_left + r->m_renderer->marginLeft(), r->m_top + r->m_renderer->marginTop());

+ floatsOverflowRect.unite(floatOverflowRect);

+ }

+ child->addVisualOverflow(floatsOverflowRect);

+ return lowestFloatBottom;

+void RenderBlock::addIntrudingFloats(RenderBlock* prev, int xoff, int yoff)

+ // If the parent or previous sibling doesn't have any floats to add, don't bother.

+ if (!prev->m_floatingObjects)

+ return;

+ DeprecatedPtrListIterator<FloatingObject> it(*prev->m_floatingObjects);

+ for (FloatingObject *r; (r = it.current()); ++it) {

+ if (r->m_bottom > yoff) {

+ // The object may already be in our list. Check for it up front to avoid

+ // creating duplicate entries.

+ FloatingObject* f = 0;

+ if (m_floatingObjects) {

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ while ((f = it.current())) {

+ if (f->m_renderer == r->m_renderer) break;

+ ++it;

+ }

+ if (!f) {

+ FloatingObject *floatingObj = new FloatingObject(r->type());

+ floatingObj->m_top = r->m_top - yoff;

+ floatingObj->m_bottom = r->m_bottom - yoff;

+ floatingObj->m_left = r->m_left - xoff;

+ // Applying the child's margin makes no sense in the case where the child was passed in.

+ // since his own margin was added already through the subtraction of the |xoff| variable

+ // above. |xoff| will equal -flow->marginLeft() in this case, so it's already been taken

+ // into account. Only apply this code if |child| is false, since otherwise the left margin

+ // will get applied twice.

+ if (prev != parent())

+ floatingObj->m_left += prev->marginLeft();

+ floatingObj->m_left -= marginLeft();

+ floatingObj->m_shouldPaint = false; // We are not in the direct inheritance chain for this float. We will never paint it.

+ floatingObj->m_width = r->m_width;

+ floatingObj->m_renderer = r->m_renderer;

+ // We create the floating object list lazily.

+ if (!m_floatingObjects) {

+ m_floatingObjects = new DeprecatedPtrList<FloatingObject>;

+ m_floatingObjects->setAutoDelete(true);

+ }

+ m_floatingObjects->append(floatingObj);

+ }

+bool RenderBlock::avoidsFloats() const

+ // Floats can't intrude into our box if we have a non-auto column count or width.

+ return RenderBox::avoidsFloats() || !style()->hasAutoColumnCount() || !style()->hasAutoColumnWidth();

+bool RenderBlock::containsFloat(RenderObject* o)

+ if (m_floatingObjects) {

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ while (it.current()) {

+ if (it.current()->m_renderer == o)

+ return true;

+ ++it;

+ }

+ return false;

+void RenderBlock::markAllDescendantsWithFloatsForLayout(RenderBox* floatToRemove, bool inLayout)

+ setChildNeedsLayout(true, !inLayout);

+ if (floatToRemove)

+ removeFloatingObject(floatToRemove);

+ // Iterate over our children and mark them as needed.

+ if (!childrenInline()) {

+ for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {

+ if (child->isRenderBlock() && !child->isFloatingOrPositioned() &&

+ ((floatToRemove ? child->containsFloat(floatToRemove) : child->containsFloats()) || child->shrinkToAvoidFloats()))

+ toRenderBlock(child)->markAllDescendantsWithFloatsForLayout(floatToRemove, inLayout);

+ }

+int RenderBlock::getClearDelta(RenderBox* child)

+ // There is no need to compute clearance if we have no floats.

+ if (!containsFloats())

+ return 0;

+ // At least one float is present. We need to perform the clearance computation.

+ bool clearSet = child->style()->clear() != CNONE;

+ int bottom = 0;

+ switch (child->style()->clear()) {

+ case CNONE:

+ break;

+ case CLEFT:

+ bottom = leftBottom();

+ break;

+ case CRIGHT:

+ bottom = rightBottom();

+ break;

+ case CBOTH:

+ bottom = floatBottom();

+ break;

+ }

+ // We also clear floats if we are too big to sit on the same line as a float (and wish to avoid floats by default).

+ // FIXME: Note that the remaining space checks aren't quite accurate, since you should be able to clear only some floats (the minimum # needed

+ // to fit) and not all (we should be using nextFloatBottomBelow and looping).

+ // Do not allow tables to wrap in quirks or even in almost strict mode

+ // (ebay on the PLT, finance.yahoo.com in the real world, versiontracker.com forces even almost strict mode not to work)

+ int result = clearSet ? max(0, bottom - child->y()) : 0;

+ if (!result && child->avoidsFloats() && child->style()->width().isFixed() &&

+ child->minPrefWidth() > lineWidth(child->y(), false) && child->minPrefWidth() <= availableWidth() &&

+ document()->inStrictMode())

+ result = max(0, floatBottom() - child->y());

+ return result;

+void RenderBlock::addVisualOverflow(const IntRect& r)

+ if (r.isEmpty())

+ return;

+ m_overflowLeft = min(m_overflowLeft, r.x());

+ m_overflowWidth = max(m_overflowWidth, r.right());

+ m_overflowTop = min(m_overflowTop, r.y());

+ m_overflowHeight = max(m_overflowHeight, r.bottom());

+bool RenderBlock::isPointInOverflowControl(HitTestResult& result, int, int, int, int)

+ if (!scrollsOverflow())

+ return false;

+ return layer()->hitTestOverflowControls(result);

+bool RenderBlock::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction)

+ int tx = _tx + x();

+ int ty = _ty + y();

+ if (!isRenderView()) {

+ // Check if we need to do anything at all.

+ IntRect overflowBox = overflowRect(false);

+ overflowBox.move(tx, ty);

+ if (!overflowBox.contains(_x, _y))

+ return false;

+ }

+ if (isPointInOverflowControl(result, _x, _y, tx, ty)) {

+ if (hitTestAction == HitTestBlockBackground) {

+ updateHitTestResult(result, IntPoint(_x - tx, _y - ty));

+ return true;

+ }

+ return false;

+ }

+ // If we have lightweight control clipping, then we can't have any spillout.

+ if (!hasControlClip() || controlClipRect(tx, ty).contains(_x, _y)) {

+ // Hit test descendants first.

+ int scrolledX = tx;

+ int scrolledY = ty;

+ if (hasOverflowClip())

+ layer()->subtractScrolledContentOffset(scrolledX, scrolledY);

+ // Hit test contents if we don't have columns.

+ if (!hasColumns() && hitTestContents(request, result, _x, _y, scrolledX, scrolledY, hitTestAction))

+ return true;

+ // Hit test our columns if we do have them.

+ if (hasColumns() && hitTestColumns(request, result, _x, _y, scrolledX, scrolledY, hitTestAction))

+ return true;

+ // Hit test floats.

+ if (hitTestAction == HitTestFloat && m_floatingObjects) {

+ if (isRenderView()) {

+ scrolledX += toRenderView(this)->frameView()->scrollX();

+ scrolledY += toRenderView(this)->frameView()->scrollY();

+ }

+ FloatingObject* o;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for (it.toLast(); (o = it.current()); --it) {

+ if (o->m_shouldPaint && !o->m_renderer->hasLayer()) {

+ int xoffset = scrolledX + o->m_left + o->m_renderer->marginLeft() - o->m_renderer->x();

+ int yoffset = scrolledY + o->m_top + o->m_renderer->marginTop() - o->m_renderer->y();

+ if (o->m_renderer->hitTest(request, result, IntPoint(_x, _y), xoffset, yoffset)) {

+ updateHitTestResult(result, IntPoint(_x - xoffset, _y - yoffset));

+ return true;

+ }

+ // Now hit test our background

+ if (hitTestAction == HitTestBlockBackground || hitTestAction == HitTestChildBlockBackground) {

+ IntRect boundsRect(tx, ty, width(), height());

+ if (visibleToHitTesting() && boundsRect.contains(_x, _y)) {

+ updateHitTestResult(result, IntPoint(_x - tx, _y - ty));

+ return true;

+ }

+ return false;

+bool RenderBlock::hitTestColumns(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction)

+ // We need to do multiple passes, breaking up our hit testing into strips.

+ // We can always go left to right, since column contents are clipped (meaning that there

+ // can't be any overlap).

+ int currXOffset = 0;

+ int currYOffset = 0;

+ int colGap = columnGap();

+ Vector<IntRect>* colRects = columnRects();

+ for (unsigned i = 0; i < colRects->size(); i++) {

+ IntRect colRect = colRects->at(i);

+ colRect.move(tx, ty);

+ if (colRect.contains(x, y)) {

+ // The point is inside this column.

+ // Adjust tx and ty to change where we hit test.

+ int finalX = tx + currXOffset;

+ int finalY = ty + currYOffset;

+ return hitTestContents(request, result, x, y, finalX, finalY, hitTestAction);

+ }

+ // Move to the next position.

+ if (style()->direction() == LTR)

+ currXOffset += colRect.width() + colGap;

+ else

+ currXOffset -= (colRect.width() + colGap);

+ currYOffset -= colRect.height();

+ }

+ return false;

+bool RenderBlock::hitTestContents(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction)

+ if (childrenInline() && !isTable()) {

+ // We have to hit-test our line boxes.

+ if (m_lineBoxes.hitTest(this, request, result, x, y, tx, ty, hitTestAction)) {

+ updateHitTestResult(result, IntPoint(x - tx, y - ty));

+ return true;

+ }

+ } else {

+ // Hit test our children.

+ HitTestAction childHitTest = hitTestAction;

+ if (hitTestAction == HitTestChildBlockBackgrounds)

+ childHitTest = HitTestChildBlockBackground;

+ for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {

+ // FIXME: We have to skip over inline flows, since they can show up inside RenderTables at the moment (a demoted inline <form> for example). If we ever implement a

+ // table-specific hit-test method (which we should do for performance reasons anyway), then we can remove this check.

+ if (!child->hasLayer() && !child->isFloating() && !child->isRenderInline() && child->nodeAtPoint(request, result, x, y, tx, ty, childHitTest)) {

+ updateHitTestResult(result, IntPoint(x - tx, y - ty));

+ return true;

+ }

+ return false;

+Position RenderBlock::positionForBox(InlineBox *box, bool start) const

+ if (!box)

+ return Position();

+ if (!box->object()->element())

+ return Position(element(), start ? caretMinOffset() : caretMaxOffset());

+ if (!box->isInlineTextBox())

+ return Position(box->object()->element(), start ? box->object()->caretMinOffset() : box->object()->caretMaxOffset());

+ InlineTextBox *textBox = static_cast<InlineTextBox *>(box);

+ return Position(box->object()->element(), start ? textBox->start() : textBox->start() + textBox->len());

+Position RenderBlock::positionForRenderer(RenderObject* renderer, bool start) const

+ if (!renderer)

+ return Position(element(), 0);

+ Node* node = renderer->element() ? renderer->element() : element();

+ if (!node)

+ return Position();

+ ASSERT(renderer == node->renderer());

+ int offset = start ? renderer->caretMinOffset() : renderer->caretMaxOffset();

+ // FIXME: This was a runtime check that seemingly couldn't fail; changed it to an assertion for now.

+ ASSERT(!node->isCharacterDataNode() || renderer->isText());

+ return Position(node, offset);

+VisiblePosition RenderBlock::positionForCoordinates(int x, int y)

+ if (isTable())

+ return RenderBox::positionForCoordinates(x, y);

+ int top = borderTop();

+ int bottom = top + paddingTop() + contentHeight() + paddingBottom();

+ int left = borderLeft();

+ int right = left + paddingLeft() + contentWidth() + paddingRight();

+ Node* n = element();

+ int contentsX = x;

+ int contentsY = y;

+ offsetForContents(contentsX, contentsY);

+ if (isReplaced()) {

+ if (y < 0 || y < height() && x < 0)

+ return VisiblePosition(n, caretMinOffset(), DOWNSTREAM);

+ if (y >= height() || y >= 0 && x >= width())

+ return VisiblePosition(n, caretMaxOffset(), DOWNSTREAM);

+ }

+ // If we start inside the shadow tree, we will stay inside (even if the point is above or below).

+ if (!(n && n->isShadowNode()) && !childrenInline()) {

+ // Don't return positions inside editable roots for coordinates outside those roots, except for coordinates outside

+ // a document that is entirely editable.

+ bool isEditableRoot = n && n->rootEditableElement() == n && !n->hasTagName(bodyTag) && !n->hasTagName(htmlTag);

+ if (y < top || (isEditableRoot && (y < bottom && x < left))) {

+ if (!isEditableRoot)

+ if (RenderBox* c = firstChildBox()) { // FIXME: This code doesn't make any sense. This child could be an inline or a positioned element or a float, etc.

+ VisiblePosition p = c->positionForCoordinates(contentsX - c->x(), contentsY - c->y());

+ if (p.isNotNull())

+ return p;

+ }

+ if (n) {

+ if (Node* sp = n->shadowParentNode())

+ n = sp;

+ if (Node* p = n->parent())

+ return VisiblePosition(p, n->nodeIndex(), DOWNSTREAM);

+ }

+ return VisiblePosition(n, 0, DOWNSTREAM);

+ }

+ if (y >= bottom || (isEditableRoot && (y >= top && x >= right))) {

+ if (!isEditableRoot)

+ if (RenderBox* c = lastChildBox()) { // FIXME: This code doesn't make any sense. This child could be an inline or a positioned element or a float, etc.

+ VisiblePosition p = c->positionForCoordinates(contentsX - c->x(), contentsY - c->y());

+ if (p.isNotNull())

+ return p;

+ }

+ if (n) {

+ if (Node* sp = n->shadowParentNode())

+ n = sp;

+ if (Node* p = n->parent())

+ return VisiblePosition(p, n->nodeIndex() + 1, DOWNSTREAM);

+ }

+ return VisiblePosition(n, 0, DOWNSTREAM);

+ }

+ if (childrenInline()) {

+ if (!firstRootBox())

+ return VisiblePosition(n, 0, DOWNSTREAM);

+ if (contentsY < firstRootBox()->topOverflow() - verticalLineClickFudgeFactor)

+ // y coordinate is above first root line box

+ return VisiblePosition(positionForBox(firstRootBox()->firstLeafChild(), true), DOWNSTREAM);

+ // look for the closest line box in the root box which is at the passed-in y coordinate

+ for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) {

+ // set the bottom based on whether there is a next root box

+ if (root->nextRootBox())

+ // FIXME: make the break point halfway between the bottom of the previous root box and the top of the next root box

+ bottom = root->nextRootBox()->topOverflow();

+ else

+ bottom = root->bottomOverflow() + verticalLineClickFudgeFactor;

+ // check if this root line box is located at this y coordinate

+ if (contentsY < bottom && root->firstChild()) {

+ InlineBox* closestBox = root->closestLeafChildForXPos(x);

+ if (closestBox)

+ // pass the box a y position that is inside it

+ return closestBox->object()->positionForCoordinates(contentsX, closestBox->m_y);

+ }

+ if (lastRootBox())

+ // y coordinate is below last root line box

+ return VisiblePosition(positionForBox(lastRootBox()->lastLeafChild(), false), DOWNSTREAM);

+ return VisiblePosition(n, 0, DOWNSTREAM);

+ }

+ // See if any child blocks exist at this y coordinate.

+ if (firstChildBox() && contentsY < firstChildBox()->y())

+ return VisiblePosition(n, 0, DOWNSTREAM);

+ for (RenderBox* renderer = firstChildBox(); renderer; renderer = renderer->nextSiblingBox()) {

+ if (renderer->height() == 0 || renderer->style()->visibility() != VISIBLE || renderer->isFloatingOrPositioned())

+ continue;

+ RenderBox* next = renderer->nextSiblingBox();

+ while (next && next->isFloatingOrPositioned())

+ next = next->nextSiblingBox();

+ if (next)

+ bottom = next->y();

+ else

+ bottom = top + scrollHeight();

+ if (contentsY >= renderer->y() && contentsY < bottom)

+ return renderer->positionForCoordinates(contentsX - renderer->x(), contentsY - renderer->y());

+ }

+ return RenderBox::positionForCoordinates(x, y);

+void RenderBlock::offsetForContents(int& tx, int& ty) const

+ if (hasOverflowClip())

+ layer()->addScrolledContentOffset(tx, ty);

+ if (hasColumns()) {

+ IntPoint contentsPoint(tx, ty);

+ adjustPointToColumnContents(contentsPoint);

+ tx = contentsPoint.x();

+ ty = contentsPoint.y();

+ }

+int RenderBlock::availableWidth() const

+ // If we have multiple columns, then the available width is reduced to our column width.

+ if (hasColumns())

+ return desiredColumnWidth();

+ return contentWidth();

+int RenderBlock::columnGap() const

+ if (style()->hasNormalColumnGap())

+ return style()->fontDescription().computedPixelSize(); // "1em" is recommended as the normal gap setting. Matches <p> margins.

+ return static_cast<int>(style()->columnGap());

+void RenderBlock::calcColumnWidth()

+ // Calculate our column width and column count.

+ unsigned desiredColumnCount = 1;

+ int desiredColumnWidth = contentWidth();

+ // For now, we don't support multi-column layouts when printing, since we have to do a lot of work for proper pagination.

+ if (document()->printing() || (style()->hasAutoColumnCount() && style()->hasAutoColumnWidth())) {

+ setDesiredColumnCountAndWidth(desiredColumnCount, desiredColumnWidth);

+ return;

+ }

+ int availWidth = desiredColumnWidth;

+ int colGap = columnGap();

+ int colWidth = max(1, static_cast<int>(style()->columnWidth()));

+ int colCount = max(1, static_cast<int>(style()->columnCount()));

+ if (style()->hasAutoColumnWidth()) {

+ if ((colCount - 1) * colGap < availWidth) {

+ desiredColumnCount = colCount;

+ desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;

+ } else if (colGap < availWidth) {

+ desiredColumnCount = availWidth / colGap;

+ desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;

+ }

+ } else if (style()->hasAutoColumnCount()) {

+ if (colWidth < availWidth) {

+ desiredColumnCount = (availWidth + colGap) / (colWidth + colGap);

+ desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;

+ }

+ } else {

+ // Both are set.

+ if (colCount * colWidth + (colCount - 1) * colGap <= availWidth) {

+ desiredColumnCount = colCount;

+ desiredColumnWidth = colWidth;

+ } else if (colWidth < availWidth) {

+ desiredColumnCount = (availWidth + colGap) / (colWidth + colGap);

+ desiredColumnWidth = (availWidth - (desiredColumnCount - 1) * colGap) / desiredColumnCount;

+ }

+ setDesiredColumnCountAndWidth(desiredColumnCount, desiredColumnWidth);

+void RenderBlock::setDesiredColumnCountAndWidth(int count, int width)

+ if (count == 1) {

+ if (hasColumns()) {

+ delete gColumnInfoMap->take(this);

+ setHasColumns(false);

+ }

+ } else {

+ ColumnInfo* info;

+ if (hasColumns())

+ info = gColumnInfoMap->get(this);

+ else {

+ if (!gColumnInfoMap)

+ gColumnInfoMap = new ColumnInfoMap;

+ info = new ColumnInfo;

+ gColumnInfoMap->add(this, info);

+ setHasColumns(true);

+ }

+ info->m_desiredColumnCount = count;

+ info->m_desiredColumnWidth = width;

+ }

+int RenderBlock::desiredColumnWidth() const

+ if (!hasColumns())

+ return contentWidth();

+ return gColumnInfoMap->get(this)->m_desiredColumnWidth;

+unsigned RenderBlock::desiredColumnCount() const

+ if (!hasColumns())

+ return 1;

+ return gColumnInfoMap->get(this)->m_desiredColumnCount;

+Vector<IntRect>* RenderBlock::columnRects() const

+ if (!hasColumns())

+ return 0;

+ return &gColumnInfoMap->get(this)->m_columnRects;

+int RenderBlock::layoutColumns(int endOfContent)

+ // Don't do anything if we have no columns

+ if (!hasColumns())

+ return -1;

+ ColumnInfo* info = gColumnInfoMap->get(this);

+ int desiredColumnWidth = info->m_desiredColumnWidth;

+ int desiredColumnCount = info->m_desiredColumnCount;

+ Vector<IntRect>* columnRects = &info->m_columnRects;

+ bool computeIntrinsicHeight = (endOfContent == -1);

+ // Fill the columns in to the available height. Attempt to balance the height of the columns

+ int availableHeight = contentHeight();

+ int colHeight = computeIntrinsicHeight ? availableHeight / desiredColumnCount : availableHeight;

+ // Add in half our line-height to help with best-guess initial balancing.

+ int columnSlop = lineHeight(false) / 2;

+ int remainingSlopSpace = columnSlop * desiredColumnCount;

+ if (computeIntrinsicHeight)

+ colHeight += columnSlop;

+ int colGap = columnGap();

+ // Compute a collection of column rects.

+ columnRects->clear();

+ // Then we do a simulated "paint" into the column slices and allow the content to slightly adjust our individual column rects.

+ // FIXME: We need to take into account layers that are affected by the columns as well here so that they can have an opportunity

+ // to adjust column rects also.

+ RenderView* v = view();

+ int left = borderLeft() + paddingLeft();

+ int top = borderTop() + paddingTop();

+ int currX = style()->direction() == LTR ? borderLeft() + paddingLeft() : borderLeft() + paddingLeft() + contentWidth() - desiredColumnWidth;

+ int currY = top;

+ unsigned colCount = desiredColumnCount;

+ int maxColBottom = borderTop() + paddingTop();

+ int contentBottom = top + availableHeight;

+ for (unsigned i = 0; i < colCount; i++) {

+ // If we aren't constrained, then the last column can just get all the remaining space.

+ if (computeIntrinsicHeight && i == colCount - 1)

+ colHeight = availableHeight;

+ // This represents the real column position.

+ IntRect colRect(currX, top, desiredColumnWidth, colHeight);

+ // For the simulated paint, we pretend like everything is in one long strip.

+ IntRect pageRect(left, currY, desiredColumnWidth, colHeight);

+ v->setPrintRect(pageRect);

+ v->setTruncatedAt(currY + colHeight);

+ GraphicsContext context((PlatformGraphicsContext*)0);

+ RenderObject::PaintInfo paintInfo(&context, pageRect, PaintPhaseForeground, false, 0, 0);

+ setHasColumns(false);

+ paintObject(paintInfo, 0, 0);

+ setHasColumns(true);

+ int adjustedBottom = v->bestTruncatedAt();

+ if (adjustedBottom <= currY)

+ adjustedBottom = currY + colHeight;

+ colRect.setHeight(adjustedBottom - currY);

+ // Add in the lost space to the subsequent columns.

+ // FIXME: This will create a "staircase" effect if there are enough columns, but the effect should be pretty subtle.

+ if (computeIntrinsicHeight) {

+ int lostSpace = colHeight - colRect.height();

+ if (lostSpace > remainingSlopSpace) {

+ // Redestribute the space among the remaining columns.

+ int spaceToRedistribute = lostSpace - remainingSlopSpace;

+ int remainingColumns = colCount - i + 1;

+ colHeight += spaceToRedistribute / remainingColumns;

+ }

+ remainingSlopSpace = max(0, remainingSlopSpace - lostSpace);

+ }

+ if (style()->direction() == LTR)

+ currX += desiredColumnWidth + colGap;

+ else

+ currX -= (desiredColumnWidth + colGap);

+ currY += colRect.height();

+ availableHeight -= colRect.height();

+ maxColBottom = max(colRect.bottom(), maxColBottom);

+ columnRects->append(colRect);

+ // Start adding in more columns as long as there's still content left.

+ if (currY < endOfContent && i == colCount - 1 && (computeIntrinsicHeight || contentHeight()))

+ colCount++;

+ }

+ m_overflowWidth = max(width(), currX - colGap);

+ m_overflowLeft = min(0, currX + desiredColumnWidth + colGap);

+ m_overflowHeight = maxColBottom;

+ int toAdd = borderBottom() + paddingBottom() + horizontalScrollbarHeight();

+ if (computeIntrinsicHeight)

+ setHeight(m_overflowHeight + toAdd);

+ v->setPrintRect(IntRect());

+ v->setTruncatedAt(0);

+ ASSERT(colCount == columnRects->size());

+ return contentBottom;

+void RenderBlock::adjustPointToColumnContents(IntPoint& point) const

+ // Just bail if we have no columns.

+ if (!hasColumns())

+ return;

+ Vector<IntRect>* colRects = columnRects();

+ // Determine which columns we intersect.

+ int colGap = columnGap();

+ int leftGap = colGap / 2;

+ IntPoint columnPoint(colRects->at(0).location());

+ int yOffset = 0;

+ for (unsigned i = 0; i < colRects->size(); i++) {

+ // Add in half the column gap to the left and right of the rect.

+ IntRect colRect = colRects->at(i);

+ IntRect gapAndColumnRect(colRect.x() - leftGap, colRect.y(), colRect.width() + colGap, colRect.height());

+ if (gapAndColumnRect.contains(point)) {

+ // We're inside the column. Translate the x and y into our column coordinate space.

+ point.move(columnPoint.x() - colRect.x(), yOffset);

+ return;

+ }

+ // Move to the next position.

+ yOffset += colRect.height();

+ }

+void RenderBlock::adjustRectForColumns(IntRect& r) const

+ // Just bail if we have no columns.

+ if (!hasColumns())

+ return;

+ Vector<IntRect>* colRects = columnRects();

+ // Begin with a result rect that is empty.

+ IntRect result;

+ // Determine which columns we intersect.

+ int currXOffset = 0;

+ int currYOffset = 0;

+ int colGap = columnGap();

+ for (unsigned i = 0; i < colRects->size(); i++) {

+ IntRect colRect = colRects->at(i);

+ IntRect repaintRect = r;

+ repaintRect.move(currXOffset, currYOffset);

+ repaintRect.intersect(colRect);

+ result.unite(repaintRect);

+ // Move to the next position.

+ if (style()->direction() == LTR)

+ currXOffset += colRect.width() + colGap;

+ else

+ currXOffset -= (colRect.width() + colGap);

+ currYOffset -= colRect.height();

+ }

+ r = result;

+void RenderBlock::calcPrefWidths()

+ ASSERT(prefWidthsDirty());

+ updateFirstLetter();

+ if (!isTableCell() && style()->width().isFixed() && style()->width().value() > 0)

+ m_minPrefWidth = m_maxPrefWidth = calcContentBoxWidth(style()->width().value());

+ else {

+ m_minPrefWidth = 0;

+ m_maxPrefWidth = 0;

+ if (childrenInline())

+ calcInlinePrefWidths();

+ else

+ calcBlockPrefWidths();

+ m_maxPrefWidth = max(m_minPrefWidth, m_maxPrefWidth);

+ if (!style()->autoWrap() && childrenInline()) {

+ m_minPrefWidth = m_maxPrefWidth;

+ // A horizontal marquee with inline children has no minimum width.

+ if (layer() && layer()->marquee() && layer()->marquee()->isHorizontal())

+ m_minPrefWidth = 0;

+ }

+ if (isTableCell()) {

+ Length w = static_cast<const RenderTableCell*>(this)->styleOrColWidth();

+ if (w.isFixed() && w.value() > 0)

+ m_maxPrefWidth = max(m_minPrefWidth, calcContentBoxWidth(w.value()));

+ }

+ if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) {

+ m_maxPrefWidth = max(m_maxPrefWidth, calcContentBoxWidth(style()->minWidth().value()));

+ m_minPrefWidth = max(m_minPrefWidth, calcContentBoxWidth(style()->minWidth().value()));

+ }

+ if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) {

+ m_maxPrefWidth = min(m_maxPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));

+ m_minPrefWidth = min(m_minPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));

+ }

+ int toAdd = 0;

+ toAdd = borderLeft() + borderRight() + paddingLeft() + paddingRight();

+ m_minPrefWidth += toAdd;

+ m_maxPrefWidth += toAdd;

+ setPrefWidthsDirty(false);

+struct InlineMinMaxIterator

+/* InlineMinMaxIterator is a class that will iterate over all render objects that contribute to

+ inline min/max width calculations. Note the following about the way it walks:

+ (1) Positioned content is skipped (since it does not contribute to min/max width of a block)

+ (2) We do not drill into the children of floats or replaced elements, since you can't break

+ in the middle of such an element.

+ (3) Inline flows (e.g., <a>, <span>, <i>) are walked twice, since each side can have

+ distinct borders/margin/padding that contribute to the min/max width.

+*/

+ RenderObject* parent;

+ RenderObject* current;

+ bool endOfInline;

+ InlineMinMaxIterator(RenderObject* p, bool end = false)

+ :parent(p), current(p), endOfInline(end) {}

+ RenderObject* next();

+};

+RenderObject* InlineMinMaxIterator::next()

+ RenderObject* result = 0;

+ bool oldEndOfInline = endOfInline;

+ endOfInline = false;

+ while (current || current == parent) {

+ if (!oldEndOfInline &&

+ (current == parent ||

+ (!current->isFloating() && !current->isReplaced() && !current->isPositioned())))

+ result = current->firstChild();

+ if (!result) {

+ // We hit the end of our inline. (It was empty, e.g., <span></span>.)

+ if (!oldEndOfInline && current->isRenderInline()) {

+ result = current;

+ endOfInline = true;

+ break;

+ }

+ while (current && current != parent) {

+ result = current->nextSibling();

+ if (result) break;

+ current = current->parent();

+ if (current && current != parent && current->isRenderInline()) {

+ result = current;

+ endOfInline = true;

+ break;

+ }

+ if (!result)

+ break;

+ if (!result->isPositioned() && (result->isText() || result->isFloating() || result->isReplaced() || result->isRenderInline()))

+ break;

+ current = result;

+ result = 0;

+ }

+ // Update our position.

+ current = result;

+ return current;

+static int getBPMWidth(int childValue, Length cssUnit)

+ if (cssUnit.type() != Auto)

+ return (cssUnit.isFixed() ? cssUnit.value() : childValue);

+ return 0;

+static int getBorderPaddingMargin(const RenderBox* child, bool endOfInline)

+ RenderStyle* cstyle = child->style();

+ int result = 0;

+ bool leftSide = (cstyle->direction() == LTR) ? !endOfInline : endOfInline;

+ result += getBPMWidth((leftSide ? child->marginLeft() : child->marginRight()),

+ (leftSide ? cstyle->marginLeft() :

+ cstyle->marginRight()));

+ result += getBPMWidth((leftSide ? child->paddingLeft() : child->paddingRight()),

+ (leftSide ? cstyle->paddingLeft() :

+ cstyle->paddingRight()));

+ result += leftSide ? child->borderLeft() : child->borderRight();

+ return result;

+static inline void stripTrailingSpace(int& inlineMax, int& inlineMin,

+ RenderObject* trailingSpaceChild)

+ if (trailingSpaceChild && trailingSpaceChild->isText()) {

+ // Collapse away the trailing space at the end of a block.

+ RenderText* t = toRenderText(trailingSpaceChild);

+ const UChar space = ' ';

+ const Font& font = t->style()->font(); // FIXME: This ignores first-line.

+ int spaceWidth = font.width(TextRun(&space, 1));

+ inlineMax -= spaceWidth + font.wordSpacing();

+ if (inlineMin > inlineMax)

+ inlineMin = inlineMax;

+ }

+void RenderBlock::calcInlinePrefWidths()

+ int inlineMax = 0;

+ int inlineMin = 0;

+ int cw = containingBlock()->contentWidth();

+ // If we are at the start of a line, we want to ignore all white-space.

+ // Also strip spaces if we previously had text that ended in a trailing space.

+ bool stripFrontSpaces = true;

+ RenderObject* trailingSpaceChild = 0;

+ // Firefox and Opera will allow a table cell to grow to fit an image inside it under

+ // very specific cirucumstances (in order to match common WinIE renderings).

+ // Not supporting the quirk has caused us to mis-render some real sites. (See Bugzilla 10517.)

+ bool allowImagesToBreak = !style()->htmlHacks() || !isTableCell() || !style()->width().isIntrinsicOrAuto();

+ bool autoWrap, oldAutoWrap;

+ autoWrap = oldAutoWrap = style()->autoWrap();

+ InlineMinMaxIterator childIterator(this);

+ bool addedTextIndent = false; // Only gets added in once.

+ RenderObject* prevFloat = 0;

+ RenderObject* previousLeaf = 0;

+ while (RenderObject* child = childIterator.next()) {

+ autoWrap = child->isReplaced() ? child->parent()->style()->autoWrap() :

+ child->style()->autoWrap();

+ if (!child->isBR()) {

+ // Step One: determine whether or not we need to go ahead and

+ // terminate our current line. Each discrete chunk can become

+ // the new min-width, if it is the widest chunk seen so far, and

+ // it can also become the max-width.

+ // Children fall into three categories:

+ // (1) An inline flow object. These objects always have a min/max of 0,

+ // and are included in the iteration solely so that their margins can

+ // be added in.

+ //

+ // (2) An inline non-text non-flow object, e.g., an inline replaced element.

+ // These objects can always be on a line by themselves, so in this situation

+ // we need to go ahead and break the current line, and then add in our own

+ // margins and min/max width on its own line, and then terminate the line.

+ //

+ // (3) A text object. Text runs can have breakable characters at the start,

+ // the middle or the end. They may also lose whitespace off the front if

+ // we're already ignoring whitespace. In order to compute accurate min-width

+ // information, we need three pieces of information.

+ // (a) the min-width of the first non-breakable run. Should be 0 if the text string

+ // starts with whitespace.

+ // (b) the min-width of the last non-breakable run. Should be 0 if the text string

+ // ends with whitespace.

+ // (c) the min/max width of the string (trimmed for whitespace).

+ //

+ // If the text string starts with whitespace, then we need to go ahead and

+ // terminate our current line (unless we're already in a whitespace stripping

+ // mode.

+ //

+ // If the text string has a breakable character in the middle, but didn't start

+ // with whitespace, then we add the width of the first non-breakable run and

+ // then end the current line. We then need to use the intermediate min/max width

+ // values (if any of them are larger than our current min/max). We then look at

+ // the width of the last non-breakable run and use that to start a new line

+ // (unless we end in whitespace).

+ RenderStyle* cstyle = child->style();

+ int childMin = 0;

+ int childMax = 0;

+ if (!child->isText()) {

+ // Case (1) and (2). Inline replaced and inline flow elements.

+ if (child->isRenderInline()) {

+ // Add in padding/border/margin from the appropriate side of

+ // the element.

+ int bpm = getBorderPaddingMargin(static_cast<RenderBox*>(child), childIterator.endOfInline);

+ childMin += bpm;

+ childMax += bpm;

+ inlineMin += childMin;

+ inlineMax += childMax;

+ child->setPrefWidthsDirty(false);

+ } else {

+ // Inline replaced elts add in their margins to their min/max values.

+ int margins = 0;

+ Length leftMargin = cstyle->marginLeft();

+ Length rightMargin = cstyle->marginRight();

+ if (leftMargin.isFixed())

+ margins += leftMargin.value();

+ if (rightMargin.isFixed())

+ margins += rightMargin.value();

+ childMin += margins;

+ childMax += margins;

+ }

+ if (!child->isRenderInline() && !child->isText()) {

+ // Case (2). Inline replaced elements and floats.

+ // Go ahead and terminate the current line as far as

+ // minwidth is concerned.

+ childMin += child->minPrefWidth();

+ childMax += child->maxPrefWidth();

+ bool clearPreviousFloat;

+ if (child->isFloating()) {

+ clearPreviousFloat = (prevFloat

+ && (prevFloat->style()->floating() == FLEFT && (child->style()->clear() & CLEFT)

+ || prevFloat->style()->floating() == FRIGHT && (child->style()->clear() & CRIGHT)));

+ prevFloat = child;

+ } else

+ clearPreviousFloat = false;

+ bool canBreakReplacedElement = !child->isImage() || allowImagesToBreak;

+ if (canBreakReplacedElement && (autoWrap || oldAutoWrap) || clearPreviousFloat) {

+ m_minPrefWidth = max(inlineMin, m_minPrefWidth);

+ inlineMin = 0;

+ }

+ // If we're supposed to clear the previous float, then terminate maxwidth as well.

+ if (clearPreviousFloat) {

+ m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);

+ inlineMax = 0;

+ }

+ // Add in text-indent. This is added in only once.

+ int ti = 0;

+ if (!addedTextIndent) {

+ addedTextIndent = true;

+ ti = style()->textIndent().calcMinValue(cw);

+ childMin+=ti;

+ childMax+=ti;

+ }

+ // Add our width to the max.

+ inlineMax += childMax;

+ if (!autoWrap || !canBreakReplacedElement) {

+ if (child->isFloating())

+ m_minPrefWidth = max(childMin, m_minPrefWidth);

+ else

+ inlineMin += childMin;

+ } else {

+ // Now check our line.

+ m_minPrefWidth = max(childMin, m_minPrefWidth);

+ // Now start a new line.

+ inlineMin = 0;

+ }

+ // We are no longer stripping whitespace at the start of

+ // a line.

+ if (!child->isFloating()) {

+ stripFrontSpaces = false;

+ trailingSpaceChild = 0;

+ }

+ } else if (child->isText()) {

+ // Case (3). Text.

+ RenderText* t = toRenderText(child);

+ if (t->isWordBreak()) {

+ m_minPrefWidth = max(inlineMin, m_minPrefWidth);

+ inlineMin = 0;

+ continue;

+ }

+ // Determine if we have a breakable character. Pass in

+ // whether or not we should ignore any spaces at the front

+ // of the string. If those are going to be stripped out,

+ // then they shouldn't be considered in the breakable char

+ // check.

+ bool hasBreakableChar, hasBreak;

+ int beginMin, endMin;

+ bool beginWS, endWS;

+ int beginMax, endMax;

+ t->trimmedPrefWidths(inlineMax, beginMin, beginWS, endMin, endWS,

+ hasBreakableChar, hasBreak, beginMax, endMax,

+ childMin, childMax, stripFrontSpaces);

+ // This text object will not be rendered, but it may still provide a breaking opportunity.

+ if (!hasBreak && childMax == 0) {

+ if (autoWrap && (beginWS || endWS)) {

+ m_minPrefWidth = max(inlineMin, m_minPrefWidth);

+ inlineMin = 0;

+ }

+ continue;

+ }

+ if (stripFrontSpaces)

+ trailingSpaceChild = child;

+ else

+ trailingSpaceChild = 0;

+ // Add in text-indent. This is added in only once.

+ int ti = 0;

+ if (!addedTextIndent) {

+ addedTextIndent = true;

+ ti = style()->textIndent().calcMinValue(cw);

+ childMin+=ti; beginMin += ti;

+ childMax+=ti; beginMax += ti;

+ }

+ // If we have no breakable characters at all,

+ // then this is the easy case. We add ourselves to the current

+ // min and max and continue.

+ if (!hasBreakableChar) {

+ inlineMin += childMin;

+ } else {

+ // We have a breakable character. Now we need to know if

+ // we start and end with whitespace.

+ if (beginWS)

+ // Go ahead and end the current line.

+ m_minPrefWidth = max(inlineMin, m_minPrefWidth);

+ else {

+ inlineMin += beginMin;

+ m_minPrefWidth = max(inlineMin, m_minPrefWidth);

+ childMin -= ti;

+ }

+ inlineMin = childMin;

+ if (endWS) {

+ // We end in whitespace, which means we can go ahead

+ // and end our current line.

+ m_minPrefWidth = max(inlineMin, m_minPrefWidth);

+ inlineMin = 0;

+ } else {

+ m_minPrefWidth = max(inlineMin, m_minPrefWidth);

+ inlineMin = endMin;

+ }

+ if (hasBreak) {

+ inlineMax += beginMax;

+ m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);

+ m_maxPrefWidth = max(childMax, m_maxPrefWidth);

+ inlineMax = endMax;

+ } else

+ inlineMax += childMax;

+ }

+ } else {

+ m_minPrefWidth = max(inlineMin, m_minPrefWidth);

+ m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);

+ inlineMin = inlineMax = 0;

+ stripFrontSpaces = true;

+ trailingSpaceChild = 0;

+ }

+ oldAutoWrap = autoWrap;

+ if (!child->isRenderInline())

+ previousLeaf = child;

+ }

+ if (style()->collapseWhiteSpace())

+ stripTrailingSpace(inlineMax, inlineMin, trailingSpaceChild);

+ m_minPrefWidth = max(inlineMin, m_minPrefWidth);

+ m_maxPrefWidth = max(inlineMax, m_maxPrefWidth);

+// Use a very large value (in effect infinite).

+#define BLOCK_MAX_WIDTH 15000

+void RenderBlock::calcBlockPrefWidths()

+ bool nowrap = style()->whiteSpace() == NOWRAP;

+ RenderObject *child = firstChild();

+ int floatLeftWidth = 0, floatRightWidth = 0;

+ while (child) {

+ // Positioned children don't affect the min/max width

+ if (child->isPositioned()) {

+ child = child->nextSibling();

+ continue;

+ }

+ if (child->isFloating() || child->avoidsFloats()) {

+ int floatTotalWidth = floatLeftWidth + floatRightWidth;

+ if (child->style()->clear() & CLEFT) {

+ m_maxPrefWidth = max(floatTotalWidth, m_maxPrefWidth);

+ floatLeftWidth = 0;

+ }

+ if (child->style()->clear() & CRIGHT) {

+ m_maxPrefWidth = max(floatTotalWidth, m_maxPrefWidth);

+ floatRightWidth = 0;

+ }

+ // A margin basically has three types: fixed, percentage, and auto (variable).

+ // Auto and percentage margins simply become 0 when computing min/max width.

+ // Fixed margins can be added in as is.

+ Length ml = child->style()->marginLeft();

+ Length mr = child->style()->marginRight();

+ int margin = 0, marginLeft = 0, marginRight = 0;

+ if (ml.isFixed())

+ marginLeft += ml.value();

+ if (mr.isFixed())

+ marginRight += mr.value();

+ margin = marginLeft + marginRight;

+ int w = child->minPrefWidth() + margin;

+ m_minPrefWidth = max(w, m_minPrefWidth);

+ // IE ignores tables for calculation of nowrap. Makes some sense.

+ if (nowrap && !child->isTable())

+ m_maxPrefWidth = max(w, m_maxPrefWidth);

+ w = child->maxPrefWidth() + margin;

+ if (!child->isFloating()) {

+ if (child->avoidsFloats()) {

+ // Determine a left and right max value based off whether or not the floats can fit in the

+ // margins of the object. For negative margins, we will attempt to overlap the float if the negative margin

+ // is smaller than the float width.

+ int maxLeft = marginLeft > 0 ? max(floatLeftWidth, marginLeft) : floatLeftWidth + marginLeft;

+ int maxRight = marginRight > 0 ? max(floatRightWidth, marginRight) : floatRightWidth + marginRight;

+ w = child->maxPrefWidth() + maxLeft + maxRight;

+ w = max(w, floatLeftWidth + floatRightWidth);

+ }

+ else

+ m_maxPrefWidth = max(floatLeftWidth + floatRightWidth, m_maxPrefWidth);

+ floatLeftWidth = floatRightWidth = 0;

+ }

+ if (child->isFloating()) {

+ if (style()->floating() == FLEFT)

+ floatLeftWidth += w;

+ else

+ floatRightWidth += w;

+ } else

+ m_maxPrefWidth = max(w, m_maxPrefWidth);

+ // A very specific WinIE quirk.

+ // Example:

+ /*

+ <div style="position:absolute; width:100px; top:50px;">

+ <div style="position:absolute;left:0px;top:50px;height:50px;background-color:green">

+ <table style="width:100%"><tr><td></table>

+ </div>

+ */

+ // In the above example, the inner absolute positioned block should have a computed width

+ // of 100px because of the table.

+ // We can achieve this effect by making the maxwidth of blocks that contain tables

+ // with percentage widths be infinite (as long as they are not inside a table cell).

+ if (style()->htmlHacks() && child->style()->width().isPercent() &&

+ !isTableCell() && child->isTable() && m_maxPrefWidth < BLOCK_MAX_WIDTH) {

+ RenderBlock* cb = containingBlock();

+ while (!cb->isRenderView() && !cb->isTableCell())

+ cb = cb->containingBlock();

+ if (!cb->isTableCell())

+ m_maxPrefWidth = BLOCK_MAX_WIDTH;

+ }

+ child = child->nextSibling();

+ }

+ // Always make sure these values are non-negative.

+ m_minPrefWidth = max(0, m_minPrefWidth);

+ m_maxPrefWidth = max(0, m_maxPrefWidth);

+ m_maxPrefWidth = max(floatLeftWidth + floatRightWidth, m_maxPrefWidth);

+bool RenderBlock::hasLineIfEmpty() const

+ if (!element())

+ return false;

+ if (element()->isContentEditable() && element()->rootEditableElement() == element())

+ return true;

+ // TODO(ojan): Upstream the change below as part of upstreaming the RenderTextControl changes

+ // To put the overflow on the HTMLTextAreaElement instead of it's shadow node.

+ if (element()->isShadowNode() &&

+ (element()->shadowParentNode()->hasTagName(inputTag) ||

+ element()->shadowParentNode()->hasTagName(textareaTag)))

+ return true;

+ return false;

+int RenderBlock::lineHeight(bool firstLine, bool isRootLineBox) const

+ // Inline blocks are replaced elements. Otherwise, just pass off to

+ // the base class. If we're being queried as though we're the root line

+ // box, then the fact that we're an inline-block is irrelevant, and we behave

+ // just like a block.

+ if (isReplaced() && !isRootLineBox)

+ return height() + marginTop() + marginBottom();

+ if (firstLine && document()->usesFirstLineRules()) {

+ RenderStyle* s = style(firstLine);

+ if (s != style())

+ return s->computedLineHeight();

+ }

+ if (m_lineHeight == -1)

+ m_lineHeight = style()->computedLineHeight();

+ return m_lineHeight;

+int RenderBlock::baselinePosition(bool b, bool isRootLineBox) const

+ // Inline blocks are replaced elements. Otherwise, just pass off to

+ // the base class. If we're being queried as though we're the root line

+ // box, then the fact that we're an inline-block is irrelevant, and we behave

+ // just like a block.

+ if (isReplaced() && !isRootLineBox) {

+ // For "leaf" theme objects, let the theme decide what the baseline position is.

+ // FIXME: Might be better to have a custom CSS property instead, so that if the theme

+ // is turned off, checkboxes/radios will still have decent baselines.

+ if (style()->hasAppearance() && !theme()->isControlContainer(style()->appearance()))

+ return theme()->baselinePosition(this);

+ // CSS2.1 states that the baseline of an inline block is the baseline of the last line box in

+ // the normal flow. We make an exception for marquees, since their baselines are meaningless

+ // (the content inside them moves). This matches WinIE as well, which just bottom-aligns them.

+ // We also give up on finding a baseline if we have a vertical scrollbar, or if we are scrolled

+ // vertically (e.g., an overflow:hidden block that has had scrollTop moved) or if the baseline is outside

+ // of our content box.

+ int baselinePos = (layer() && (layer()->marquee() || layer()->verticalScrollbar() || layer()->scrollYOffset() != 0)) ? -1 : getBaselineOfLastLineBox();

+ if (baselinePos != -1 && baselinePos <= borderTop() + paddingTop() + contentHeight())

+ return marginTop() + baselinePos;

+ return height() + marginTop() + marginBottom();

+ }

+ return RenderBox::baselinePosition(b, isRootLineBox);

+int RenderBlock::getBaselineOfFirstLineBox() const

+ if (!isBlockFlow())

+ return RenderBox::getBaselineOfFirstLineBox();

+ if (childrenInline()) {

+ if (firstLineBox())

+ return firstLineBox()->yPos() + firstLineBox()->baseline();

+ else

+ return -1;

+ }

+ else {

+ for (RenderBox* curr = firstChildBox(); curr; curr = curr->nextSiblingBox()) {

+ if (!curr->isFloatingOrPositioned()) {

+ int result = curr->getBaselineOfFirstLineBox();

+ if (result != -1)

+ return curr->y() + result; // Translate to our coordinate space.

+ }

+ return -1;

+int RenderBlock::getBaselineOfLastLineBox() const

+ if (!isBlockFlow())

+ return RenderBox::getBaselineOfLastLineBox();

+ if (childrenInline()) {

+ if (!firstLineBox() && hasLineIfEmpty())

+ return RenderBox::baselinePosition(true, true) + borderTop() + paddingTop();

+ if (lastLineBox())

+ return lastLineBox()->yPos() + lastLineBox()->baseline();

+ return -1;

+ }

+ else {

+ bool haveNormalFlowChild = false;

+ for (RenderBox* curr = lastChildBox(); curr; curr = curr->previousSiblingBox()) {

+ if (!curr->isFloatingOrPositioned()) {

+ haveNormalFlowChild = true;

+ int result = curr->getBaselineOfLastLineBox();

+ if (result != -1)

+ return curr->y() + result; // Translate to our coordinate space.

+ }

+ if (!haveNormalFlowChild && hasLineIfEmpty())

+ return RenderBox::baselinePosition(true, true) + borderTop() + paddingTop();

+ }

+ return -1;

+bool RenderBlock::containsNonZeroBidiLevel() const

+ for (RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox()) {

+ for (InlineBox* box = root->firstLeafChild(); box; box = box->nextLeafChild()) {

+ if (box->bidiLevel())

+ return true;

+ }

+ return false;

+RenderBlock* RenderBlock::firstLineBlock() const

+ RenderBlock* firstLineBlock = const_cast<RenderBlock*>(this);

+ bool hasPseudo = false;

+ while (true) {

+ hasPseudo = firstLineBlock->style()->hasPseudoStyle(FIRST_LINE);

+ if (hasPseudo)

+ break;

+ RenderObject* parentBlock = firstLineBlock->parent();

+ if (firstLineBlock->isReplaced() || firstLineBlock->isFloating() ||

+ !parentBlock || parentBlock->firstChild() != firstLineBlock || !parentBlock->isBlockFlow())

+ break;

+ ASSERT(parentBlock->isRenderBlock());

+ firstLineBlock = toRenderBlock(parentBlock);

+ }

+ if (!hasPseudo)

+ return 0;

+ return firstLineBlock;

+void RenderBlock::updateFirstLetter()

+ if (!document()->usesFirstLetterRules())

+ return;

+ // Don't recurse

+ if (style()->styleType() == FIRST_LETTER)

+ return;

+ // FIXME: We need to destroy the first-letter object if it is no longer the first child. Need to find

+ // an efficient way to check for that situation though before implementing anything.

+ RenderObject* firstLetterBlock = this;

+ bool hasPseudoStyle = false;

+ while (true) {

+ // We only honor first-letter if the firstLetterBlock can have children in the DOM. This correctly

+ // prevents form controls from honoring first-letter.

+ hasPseudoStyle = firstLetterBlock->style()->hasPseudoStyle(FIRST_LETTER)

+ && firstLetterBlock->canHaveChildren();

+ if (hasPseudoStyle)

+ break;

+ RenderObject* parentBlock = firstLetterBlock->parent();

+ if (firstLetterBlock->isReplaced() || !parentBlock || parentBlock->firstChild() != firstLetterBlock ||

+ !parentBlock->isBlockFlow())

+ break;

+ firstLetterBlock = parentBlock;

+ }

+ if (!hasPseudoStyle)

+ return;

+ // Drill into inlines looking for our first text child.

+ RenderObject* currChild = firstLetterBlock->firstChild();

+ while (currChild && currChild->needsLayout() && (!currChild->isReplaced() || currChild->isFloatingOrPositioned()) && !currChild->isText()) {

+ if (currChild->isFloatingOrPositioned()) {

+ if (currChild->style()->styleType() == FIRST_LETTER)

+ break;

+ currChild = currChild->nextSibling();

+ } else

+ currChild = currChild->firstChild();

+ }

+ // Get list markers out of the way.

+ while (currChild && currChild->isListMarker())

+ currChild = currChild->nextSibling();

+ if (!currChild)

+ return;

+ RenderObject* firstLetterContainer = currChild->parent();

+ // If the child already has style, then it has already been created, so we just want

+ // to update it.

+ if (currChild->style()->styleType() == FIRST_LETTER) {

+ RenderStyle* pseudo = firstLetterBlock->getCachedPseudoStyle(FIRST_LETTER,

+ firstLetterContainer->firstLineStyle());

+ currChild->setStyle(pseudo);

+ for (RenderObject* genChild = currChild->firstChild(); genChild; genChild = genChild->nextSibling()) {

+ if (genChild->isText())

+ genChild->setStyle(pseudo);

+ }

+ return;

+ }

+ // If the child does not already have style, we create it here.

+ if (currChild->isText() && !currChild->isBR() && currChild->parent()->style()->styleType() != FIRST_LETTER) {

+ // Our layout state is not valid for the repaints we are going to trigger by

+ // adding and removing children of firstLetterContainer.

+ view()->disableLayoutState();

+ RenderText* textObj = toRenderText(currChild);

+ // Create our pseudo style now that we have our firstLetterContainer determined.

+ RenderStyle* pseudoStyle = firstLetterBlock->getCachedPseudoStyle(FIRST_LETTER,

+ firstLetterContainer->firstLineStyle());

+ // Force inline display (except for floating first-letters)

+ pseudoStyle->setDisplay(pseudoStyle->isFloating() ? BLOCK : INLINE);

+ pseudoStyle->setPosition(StaticPosition); // CSS2 says first-letter can't be positioned.

+ RenderObject* firstLetter = 0;

+ if (pseudoStyle->display() == INLINE)

+ firstLetter = new (renderArena()) RenderInline(document());

+ else

+ firstLetter = new (renderArena()) RenderBlock(document());

+ firstLetter->setStyle(pseudoStyle);

+ firstLetterContainer->addChild(firstLetter, currChild);

+ // The original string is going to be either a generated content string or a DOM node's

+ // string. We want the original string before it got transformed in case first-letter has

+ // no text-transform or a different text-transform applied to it.

+ RefPtr<StringImpl> oldText = textObj->originalText();

+ ASSERT(oldText);

+ if (oldText && oldText->length() > 0) {

+ unsigned int length = 0;

+ // account for leading spaces and punctuation

+ while (length < oldText->length() && (isSpaceOrNewline((*oldText)[length]) || Unicode::isPunct((*oldText)[length])))

+ length++;

+ // account for first letter

+ length++;

+ // construct text fragment for the text after the first letter

+ // NOTE: this might empty

+ RenderTextFragment* remainingText =

+ new (renderArena()) RenderTextFragment(textObj->node(), oldText.get(), length, oldText->length() - length);

+ remainingText->setStyle(textObj->style());

+ if (remainingText->element())

+ remainingText->element()->setRenderer(remainingText);

+ RenderObject* nextObj = textObj->nextSibling();

+ firstLetterContainer->removeChild(textObj);

+ firstLetterContainer->addChild(remainingText, nextObj);

+ remainingText->setFirstLetter(firstLetter);

+ // construct text fragment for the first letter

+ RenderTextFragment* letter =

+ new (renderArena()) RenderTextFragment(remainingText->node(), oldText.get(), 0, length);

+ RefPtr<RenderStyle> newStyle = RenderStyle::create();

+ newStyle->inheritFrom(pseudoStyle);

+ letter->setStyle(newStyle.release());

+ firstLetter->addChild(letter);

+ textObj->destroy();

+ }

+ view()->enableLayoutState();

+ }

+bool RenderBlock::inRootBlockContext() const

+ if (isTableCell() || isFloatingOrPositioned() || hasOverflowClip())

+ return false;

+ if (isRoot() || isRenderView())

+ return true;

+ return containingBlock()->inRootBlockContext();

+// Helper methods for obtaining the last line, computing line counts and heights for line counts

+// (crawling into blocks).

+static bool shouldCheckLines(RenderObject* obj)

+ return !obj->isFloatingOrPositioned() && !obj->isRunIn() &&

+ obj->isBlockFlow() && obj->style()->height().isAuto() &&

+ (!obj->isFlexibleBox() || obj->style()->boxOrient() == VERTICAL);

+static RootInlineBox* getLineAtIndex(RenderBlock* block, int i, int& count)

+ if (block->style()->visibility() == VISIBLE) {

+ if (block->childrenInline()) {

+ for (RootInlineBox* box = block->firstRootBox(); box; box = box->nextRootBox()) {

+ if (count++ == i)

+ return box;

+ }

+ else {

+ for (RenderObject* obj = block->firstChild(); obj; obj = obj->nextSibling()) {

+ if (shouldCheckLines(obj)) {

+ RootInlineBox *box = getLineAtIndex(toRenderBlock(obj), i, count);

+ if (box)

+ return box;

+ }

+ return 0;

+static int getHeightForLineCount(RenderBlock* block, int l, bool includeBottom, int& count)

+ if (block->style()->visibility() == VISIBLE) {

+ if (block->childrenInline()) {

+ for (RootInlineBox* box = block->firstRootBox(); box; box = box->nextRootBox()) {

+ if (++count == l)

+ return box->bottomOverflow() + (includeBottom ? (block->borderBottom() + block->paddingBottom()) : 0);

+ }

+ else {

+ RenderBox* normalFlowChildWithoutLines = 0;

+ for (RenderBox* obj = block->firstChildBox(); obj; obj = obj->nextSiblingBox()) {

+ if (shouldCheckLines(obj)) {

+ int result = getHeightForLineCount(toRenderBlock(obj), l, false, count);

+ if (result != -1)

+ return result + obj->y() + (includeBottom ? (block->borderBottom() + block->paddingBottom()) : 0);

+ }

+ else if (!obj->isFloatingOrPositioned() && !obj->isRunIn())

+ normalFlowChildWithoutLines = obj;

+ }

+ if (normalFlowChildWithoutLines && l == 0)

+ return normalFlowChildWithoutLines->y() + normalFlowChildWithoutLines->height();

+ }

+ return -1;

+RootInlineBox* RenderBlock::lineAtIndex(int i)

+ int count = 0;

+ return getLineAtIndex(this, i, count);

+int RenderBlock::lineCount()

+ int count = 0;

+ if (style()->visibility() == VISIBLE) {

+ if (childrenInline())

+ for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox())

+ count++;

+ else

+ for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling())

+ if (shouldCheckLines(obj))

+ count += toRenderBlock(obj)->lineCount();

+ }

+ return count;

+int RenderBlock::heightForLineCount(int l)

+ int count = 0;

+ return getHeightForLineCount(this, l, true, count);

+void RenderBlock::adjustForBorderFit(int x, int& left, int& right) const

+ // We don't deal with relative positioning. Our assumption is that you shrink to fit the lines without accounting

+ // for either overflow or translations via relative positioning.

+ if (style()->visibility() == VISIBLE) {

+ if (childrenInline()) {

+ for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox()) {

+ if (box->firstChild())

+ left = min(left, x + box->firstChild()->xPos());

+ if (box->lastChild())

+ right = max(right, x + box->lastChild()->xPos() + box->lastChild()->width());

+ }

+ else {

+ for (RenderBox* obj = firstChildBox(); obj; obj = obj->nextSiblingBox()) {

+ if (!obj->isFloatingOrPositioned()) {

+ if (obj->isBlockFlow() && !obj->hasOverflowClip())

+ toRenderBlock(obj)->adjustForBorderFit(x + obj->x(), left, right);

+ else if (obj->style()->visibility() == VISIBLE) {

+ // We are a replaced element or some kind of non-block-flow object.

+ left = min(left, x + obj->x());

+ right = max(right, x + obj->x() + obj->width());

+ }

+ if (m_floatingObjects) {

+ FloatingObject* r;

+ DeprecatedPtrListIterator<FloatingObject> it(*m_floatingObjects);

+ for (; (r = it.current()); ++it) {

+ // Only examine the object if our m_shouldPaint flag is set.

+ if (r->m_shouldPaint) {

+ int floatLeft = r->m_left - r->m_renderer->x() + r->m_renderer->marginLeft();

+ int floatRight = floatLeft + r->m_renderer->width();

+ left = min(left, floatLeft);

+ right = max(right, floatRight);

+ }

+void RenderBlock::borderFitAdjust(int& x, int& w) const

+ if (style()->borderFit() == BorderFitBorder)

+ return;

+ // Walk any normal flow lines to snugly fit.

+ int left = INT_MAX;

+ int right = INT_MIN;

+ int oldWidth = w;

+ adjustForBorderFit(0, left, right);

+ if (left != INT_MAX) {

+ left -= (borderLeft() + paddingLeft());

+ if (left > 0) {

+ x += left;

+ w -= left;

+ }

+ if (right != INT_MIN) {

+ right += (borderRight() + paddingRight());

+ if (right < oldWidth)

+ w -= (oldWidth - right);

+ }

+void RenderBlock::clearTruncation()

+ if (style()->visibility() == VISIBLE) {

+ if (childrenInline() && hasMarkupTruncation()) {

+ setHasMarkupTruncation(false);

+ for (RootInlineBox* box = firstRootBox(); box; box = box->nextRootBox())

+ box->clearTruncation();

+ }

+ else

+ for (RenderObject* obj = firstChild(); obj; obj = obj->nextSibling())

+ if (shouldCheckLines(obj))

+ toRenderBlock(obj)->clearTruncation();

+ }

+void RenderBlock::setMaxTopMargins(int pos, int neg)

+ if (!m_maxMargin) {

+ if (pos == MaxMargin::topPosDefault(this) && neg == MaxMargin::topNegDefault(this))

+ return;

+ m_maxMargin = new MaxMargin(this);

+ }

+ m_maxMargin->m_topPos = pos;

+ m_maxMargin->m_topNeg = neg;

+void RenderBlock::setMaxBottomMargins(int pos, int neg)

+ if (!m_maxMargin) {

+ if (pos == MaxMargin::bottomPosDefault(this) && neg == MaxMargin::bottomNegDefault(this))

+ return;

+ m_maxMargin = new MaxMargin(this);

+ }

+ m_maxMargin->m_bottomPos = pos;

+ m_maxMargin->m_bottomNeg = neg;

+void RenderBlock::absoluteRects(Vector<IntRect>& rects, int tx, int ty, bool topLevel)

+ // For blocks inside inlines, we go ahead and include margins so that we run right up to the

+ // inline boxes above and below us (thus getting merged with them to form a single irregular

+ // shape).

+ if (topLevel && inlineContinuation()) {

+ rects.append(IntRect(tx, ty - collapsedMarginTop(),

+ width(), height() + collapsedMarginTop() + collapsedMarginBottom()));

+ inlineContinuation()->absoluteRects(rects,

+ tx - x() + inlineContinuation()->containingBlock()->x(),

+ ty - y() + inlineContinuation()->containingBlock()->y(), topLevel);

+ } else

+ rects.append(IntRect(tx, ty, width(), height()));

+void RenderBlock::absoluteQuads(Vector<FloatQuad>& quads, bool topLevel)

+ // For blocks inside inlines, we go ahead and include margins so that we run right up to the

+ // inline boxes above and below us (thus getting merged with them to form a single irregular

+ // shape).

+ if (topLevel && inlineContinuation()) {

+ FloatRect localRect(0, -collapsedMarginTop(),

+ width(), height() + collapsedMarginTop() + collapsedMarginBottom());

+ quads.append(localToAbsoluteQuad(localRect));

+ inlineContinuation()->absoluteQuads(quads, topLevel);

+ } else

+ quads.append(RenderBox::localToAbsoluteQuad(FloatRect(0, 0, width(), height())));

+IntRect RenderBlock::rectWithOutlineForRepaint(RenderBoxModelObject* repaintContainer, int outlineWidth)

+ IntRect r(RenderBox::rectWithOutlineForRepaint(repaintContainer, outlineWidth));

+ if (inlineContinuation())

+ r.inflateY(collapsedMarginTop());

+ return r;

+RenderObject* RenderBlock::hoverAncestor() const

+ return inlineContinuation() ? inlineContinuation() : RenderBox::hoverAncestor();

+void RenderBlock::updateDragState(bool dragOn)

+ RenderBox::updateDragState(dragOn);

+ if (inlineContinuation())

+ inlineContinuation()->updateDragState(dragOn);

+RenderStyle* RenderBlock::outlineStyleForRepaint() const

+ return inlineContinuation() ? inlineContinuation()->style() : style();

+void RenderBlock::childBecameNonInline(RenderObject*)

+ makeChildrenNonInline();

+ if (isAnonymousBlock() && parent() && parent()->isRenderBlock())

+ toRenderBlock(parent())->removeLeftoverAnonymousBlock(this);

+ // |this| may be dead here

+void RenderBlock::updateHitTestResult(HitTestResult& result, const IntPoint& point)

+ if (result.innerNode())

+ return;

+ Node* node = element();

+ if (inlineContinuation())

+ // We are in the margins of block elements that are part of a continuation. In

+ // this case we're actually still inside the enclosing inline element that was

+ // split. Go ahead and set our inner node accordingly.

+ node = inlineContinuation()->element();

+ if (node) {

+ result.setInnerNode(node);

+ if (!result.innerNonSharedNode())

+ result.setInnerNonSharedNode(node);

+ result.setLocalPoint(point);

+ }

+IntRect RenderBlock::localCaretRect(InlineBox* inlineBox, int caretOffset, int* extraWidthToEndOfLine)

+ // Do the normal calculation in most cases.

+ if (firstChild())

+ return RenderBox::localCaretRect(inlineBox, caretOffset, extraWidthToEndOfLine);

+ // This is a special case:

+ // The element is not an inline element, and it's empty. So we have to

+ // calculate a fake position to indicate where objects are to be inserted.

+ // FIXME: This does not take into account either :first-line or :first-letter

+ // However, as soon as some content is entered, the line boxes will be

+ // constructed and this kludge is not called any more. So only the caret size

+ // of an empty :first-line'd block is wrong. I think we can live with that.

+ RenderStyle* currentStyle = firstLineStyle();

+ int height = lineHeight(true);

+ const int caretWidth = 1;

+ enum CaretAlignment { alignLeft, alignRight, alignCenter };

+ CaretAlignment alignment = alignLeft;

+ switch (currentStyle->textAlign()) {

+ case TAAUTO:

+ case JUSTIFY:

+ if (currentStyle->direction() == RTL)

+ alignment = alignRight;

+ break;

+ case LEFT:

+ case WEBKIT_LEFT:

+ break;

+ case CENTER:

+ case WEBKIT_CENTER:

+ alignment = alignCenter;

+ break;

+ case RIGHT:

+ case WEBKIT_RIGHT:

+ alignment = alignRight;

+ break;

+ }

+ int x = borderLeft() + paddingLeft();

+ int w = width();

+ switch (alignment) {

+ case alignLeft:

+ break;

+ case alignCenter:

+ x = (x + w - (borderRight() + paddingRight())) / 2;

+ break;

+ case alignRight:

+ x = w - (borderRight() + paddingRight());

+ break;

+ }

+ if (extraWidthToEndOfLine) {

+ if (isRenderBlock()) {

+ *extraWidthToEndOfLine = w - (x + caretWidth);

+ } else {

+ // FIXME: This code looks wrong.

+ // myRight and containerRight are set up, but then clobbered.

+ // So *extraWidthToEndOfLine will always be 0 here.

+ int myRight = x + caretWidth;

+ // FIXME: why call localToAbsoluteForContent() twice here, too?

+ FloatPoint absRightPoint = localToAbsolute(FloatPoint(myRight, 0));

+ int containerRight = containingBlock()->x() + containingBlockWidth();

+ FloatPoint absContainerPoint = localToAbsolute(FloatPoint(containerRight, 0));

+ *extraWidthToEndOfLine = absContainerPoint.x() - absRightPoint.x();

+ }

+ int y = paddingTop() + borderTop();

+ return IntRect(x, y, caretWidth, height);

+void RenderBlock::addFocusRingRects(GraphicsContext* graphicsContext, int tx, int ty)

+ // For blocks inside inlines, we go ahead and include margins so that we run right up to the

+ // inline boxes above and below us (thus getting merged with them to form a single irregular

+ // shape).

+ if (inlineContinuation()) {

+ // FIXME: This check really isn't accurate.

+ bool nextInlineHasLineBox = inlineContinuation()->firstLineBox();

+ // FIXME: This is wrong. The principal renderer may not be the continuation preceding this block.

+ bool prevInlineHasLineBox = toRenderInline(inlineContinuation()->element()->renderer())->firstLineBox();

+ int topMargin = prevInlineHasLineBox ? collapsedMarginTop() : 0;

+ int bottomMargin = nextInlineHasLineBox ? collapsedMarginBottom() : 0;

+ graphicsContext->addFocusRingRect(IntRect(tx, ty - topMargin,

+ width(), height() + topMargin + bottomMargin));

+ } else

+ graphicsContext->addFocusRingRect(IntRect(tx, ty, width(), height()));

+ if (!hasOverflowClip() && !hasControlClip()) {

+ for (InlineRunBox* curr = firstLineBox(); curr; curr = curr->nextLineBox())

+ graphicsContext->addFocusRingRect(IntRect(tx + curr->xPos(), ty + curr->yPos(), curr->width(), curr->height()));

+ for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling()) {

+ if (!curr->isText() && !curr->isListMarker() && curr->isBox()) {

+ RenderBox* box = toRenderBox(curr);

+ FloatPoint pos;

+ // FIXME: This doesn't work correctly with transforms.

+ if (box->layer())

+ pos = curr->localToAbsolute();

+ else

+ pos = FloatPoint(tx + box->x(), ty + box->y());

+ box->addFocusRingRects(graphicsContext, pos.x(), pos.y());

+ }

+ if (inlineContinuation())

+ inlineContinuation()->addFocusRingRects(graphicsContext,

+ tx - x() + inlineContinuation()->containingBlock()->x(),

+ ty - y() + inlineContinuation()->containingBlock()->y());

+const char* RenderBlock::renderName() const

+ if (isBody())

+ return "RenderBody"; // FIXME: Temporary hack until we know that the regression tests pass.

+ if (isFloating())

+ return "RenderBlock (floating)";

+ if (isPositioned())

+ return "RenderBlock (positioned)";

+ if (isAnonymousBlock())

+ return "RenderBlock (anonymous)";

+ else if (isAnonymous())

+ return "RenderBlock (generated)";

+ if (isRelPositioned())

+ return "RenderBlock (relative positioned)";

+ if (isRunIn())

+ return "RenderBlock (run-in)";

+ return "RenderBlock";

+} // namespace WebCore

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