WebKit merge 40500:40539 [WebKit side]

third_party/WebKit/WebCore/rendering/RenderObjectChildList.cpp

 /*
  * Copyright (C) 2009 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
 #include "config.h"
 #include "RenderObjectChildList.h"
-#include "RenderObject.h"
+
+#include "AXObjectCache.h"
+#include "RenderBlock.h"
+#include "RenderCounter.h"
+#include "RenderImageGeneratedContent.h"
+#include "RenderInline.h"
+#include "RenderLayer.h"
+#include "RenderListItem.h"
+#include "RenderStyle.h"
+#include "RenderTextFragment.h"
+#include "RenderView.h"
 
 namespace WebCore {
 
+static void updateListMarkerNumbers(RenderObject* child)
+{
+    for (RenderObject* r = child; r; r = r->nextSibling()) {
+        if (r->isListItem())
+            static_cast<RenderListItem*>(r)->updateValue();
+    }
+}
+
+
 void RenderObjectChildList::destroyLeftoverChildren()
 {
     while (firstChild()) {
         if (firstChild()->isListMarker() || (firstChild()->style()->styleType() == RenderStyle::FIRST_LETTER && !firstChild()->isText()))
             firstChild()->remove();  // List markers are owned by their enclosing list and so don't get destroyed by this container. Similarly, first letters are destroyed by their remaining text fragment.
         else {
             // Destroy any anonymous children remaining in the render tree, as well as implicit (shadow) DOM elements like those used in the engine-based text fields.
             if (firstChild()->element())
                 firstChild()->element()->setRenderer(0);
             firstChild()->destroy();
         }
     }
 }
 
-}
+RenderObject* RenderObjectChildList::removeChildNode(RenderObject* owner, RenderObject* oldChild, bool fullRemove)
+{
+    ASSERT(oldChild->parent() == owner);
+
+    // So that we'll get the appropriate dirty bit set (either that a normal flow child got yanked or
+    // that a positioned child got yanked).  We also repaint, so that the area exposed when the child
+    // disappears gets repainted properly.
+    if (!owner->documentBeingDestroyed() && fullRemove && oldChild->m_everHadLayout) {
+        oldChild->setNeedsLayoutAndPrefWidthsRecalc();
+        oldChild->repaint();
+    }
+        
+    // If we have a line box wrapper, delete it.
+    oldChild->deleteLineBoxWrapper();
+
+    if (!owner->documentBeingDestroyed() && fullRemove) {
+        // if we remove visible child from an invisible parent, we don't know the layer visibility any more
+        RenderLayer* layer = 0;
+        if (owner->style()->visibility() != VISIBLE && oldChild->style()->visibility() == VISIBLE && !oldChild->hasLayer()) {
+            layer = owner->enclosingLayer();
+            layer->dirtyVisibleContentStatus();
+        }
+
+         // Keep our layer hierarchy updated.
+        if (oldChild->firstChild() || oldChild->hasLayer()) {
+            if (!layer)
+                layer = owner->enclosingLayer();
+            oldChild->removeLayers(layer);
+        }
+        
+        // renumber ordered lists
+        if (oldChild->isListItem())
+            updateListMarkerNumbers(oldChild->nextSibling());
+        
+        if (oldChild->isPositioned() && owner->childrenInline())
+            owner->dirtyLinesFromChangedChild(oldChild);
+    }
+    
+    // If oldChild is the start or end of the selection, then clear the selection to
+    // avoid problems of invalid pointers.
+    // FIXME: The SelectionController should be responsible for this when it
+    // is notified of DOM mutations.
+    if (!owner->documentBeingDestroyed() && oldChild->isSelectionBorder())
+        owner->view()->clearSelection();
+
+    // remove the child
+    if (oldChild->previousSibling())
+        oldChild->previousSibling()->setNextSibling(oldChild->nextSibling());
+    if (oldChild->nextSibling())
+        oldChild->nextSibling()->setPreviousSibling(oldChild->previousSibling());
+
+    if (firstChild() == oldChild)
+        setFirstChild(oldChild->nextSibling());
+    if (lastChild() == oldChild)
+        setLastChild(oldChild->previousSibling());
+
+    oldChild->setPreviousSibling(0);
+    oldChild->setNextSibling(0);
+    oldChild->setParent(0);
+
+    if (AXObjectCache::accessibilityEnabled())
+        owner->document()->axObjectCache()->childrenChanged(owner);
+
+    return oldChild;
+}
+
+void RenderObjectChildList::appendChildNode(RenderObject* owner, RenderObject* newChild, bool fullAppend)
+{
+    ASSERT(newChild->parent() == 0);
+    ASSERT(!owner->isBlockFlow() || (!newChild->isTableSection() && !newChild->isTableRow() && !newChild->isTableCell()));
+
+    newChild->setParent(owner);
+    RenderObject* lChild = lastChild();
+
+    if (lChild) {
+        newChild->setPreviousSibling(lChild);
+        lChild->setNextSibling(newChild);
+    } else
+        setFirstChild(newChild);
+
+    setLastChild(newChild);
+    
+    if (fullAppend) {
+        // Keep our layer hierarchy updated.  Optimize for the common case where we don't have any children
+        // and don't have a layer attached to ourselves.
+        RenderLayer* layer = 0;
+        if (newChild->firstChild() || newChild->hasLayer()) {
+            layer = owner->enclosingLayer();
+            newChild->addLayers(layer, newChild);
+        }
+
+        // if the new child is visible but this object was not, tell the layer it has some visible content
+        // that needs to be drawn and layer visibility optimization can't be used
+        if (owner->style()->visibility() != VISIBLE && newChild->style()->visibility() == VISIBLE && !newChild->hasLayer()) {
+            if (!layer)
+                layer = owner->enclosingLayer();
+            if (layer)
+                layer->setHasVisibleContent(true);
+        }
+        
+        if (!newChild->isFloatingOrPositioned() && owner->childrenInline())
+            owner->dirtyLinesFromChangedChild(newChild);
+    }
+
+    newChild->setNeedsLayoutAndPrefWidthsRecalc(); // Goes up the containing block hierarchy.
+    if (!owner->normalChildNeedsLayout())
+        owner->setChildNeedsLayout(true); // We may supply the static position for an absolute positioned child.
+    
+    if (AXObjectCache::accessibilityEnabled())
+        owner->document()->axObjectCache()->childrenChanged(owner);
+}
+
+void RenderObjectChildList::insertChildNode(RenderObject* owner, RenderObject* child, RenderObject* beforeChild, bool fullInsert)
+{
+    if (!beforeChild) {
+        appendChildNode(owner, child);
+        return;
+    }
+
+    ASSERT(!child->parent());
+    while (beforeChild->parent() != owner && beforeChild->parent()->isAnonymousBlock())
+        beforeChild = beforeChild->parent();
+    ASSERT(beforeChild->parent() == owner);
+
+    ASSERT(!owner->isBlockFlow() || (!child->isTableSection() && !child->isTableRow() && !child->isTableCell()));
+
+    if (beforeChild == firstChild())
+        setFirstChild(child);
+
+    RenderObject* prev = beforeChild->previousSibling();
+    child->setNextSibling(beforeChild);
+    beforeChild->setPreviousSibling(child);
+    if (prev)
+        prev->setNextSibling(child);
+    child->setPreviousSibling(prev);
+
+    child->setParent(owner);
+    
+    if (fullInsert) {
+        // Keep our layer hierarchy updated.  Optimize for the common case where we don't have any children
+        // and don't have a layer attached to ourselves.
+        RenderLayer* layer = 0;
+        if (child->firstChild() || child->hasLayer()) {
+            layer = owner->enclosingLayer();
+            child->addLayers(layer, child);
+        }
+
+        // if the new child is visible but this object was not, tell the layer it has some visible content
+        // that needs to be drawn and layer visibility optimization can't be used
+        if (owner->style()->visibility() != VISIBLE && child->style()->visibility() == VISIBLE && !child->hasLayer()) {
+            if (!layer)
+                layer = owner->enclosingLayer();
+            if (layer)
+                layer->setHasVisibleContent(true);
+        }
+
+        
+        if (!child->isFloating() && owner->childrenInline())
+            owner->dirtyLinesFromChangedChild(child);
+    }
+
+    child->setNeedsLayoutAndPrefWidthsRecalc();
+    if (!owner->normalChildNeedsLayout())
+        owner->setChildNeedsLayout(true); // We may supply the static position for an absolute positioned child.
+    
+    if (AXObjectCache::accessibilityEnabled())
+        owner->document()->axObjectCache()->childrenChanged(owner);
+}
+
+static RenderObject* beforeAfterContainer(RenderObject* container, RenderStyle::PseudoId type)
+{
+    if (type == RenderStyle::BEFORE) {
+        RenderObject* first = container;
+        do {
+            // Skip list markers.
+            first = first->firstChild();
+            while (first && first->isListMarker())
+                first = first->nextSibling();
+        } while (first && first->isAnonymous() && first->style()->styleType() == RenderStyle::NOPSEUDO);
+        if (first && first->style()->styleType() != type)
+            return 0;
+        return first;
+    }
+    if (type == RenderStyle::AFTER) {
+        RenderObject* last = container;
+        do {
+            last = last->lastChild();
+        } while (last && last->isAnonymous() && last->style()->styleType() == RenderStyle::NOPSEUDO && !last->isListMarker());
+        if (last && last->style()->styleType() != type)
+            return 0;
+        return last;
+    }
+
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+static RenderObject* findBeforeAfterParent(RenderObject* object)
+{
+    // Only table parts need to search for the :before or :after parent
+    if (!(object->isTable() || object->isTableSection() || object->isTableRow()))
+        return object;
+
+    RenderObject* beforeAfterParent = object;
+    while (beforeAfterParent && !(beforeAfterParent->isText() || beforeAfterParent->isImage()))
+        beforeAfterParent = beforeAfterParent->firstChild();
+    return beforeAfterParent;
+}
+
+static void invalidateCountersInContainer(RenderObject* container)
+{
+    if (!container)
+        return;
+    container = findBeforeAfterParent(container);
+    if (!container)
+        return;
+    for (RenderObject* content = container->firstChild(); content; content = content->nextSibling()) {
+        if (content->isCounter())
+            static_cast<RenderCounter*>(content)->invalidate();
+    }
+}
+
+void RenderObjectChildList::invalidateCounters(RenderObject* owner)
+{
+    ASSERT(!owner->documentBeingDestroyed());
+    invalidateCountersInContainer(beforeAfterContainer(owner, RenderStyle::BEFORE));
+    invalidateCountersInContainer(beforeAfterContainer(owner, RenderStyle::AFTER));
+}
+
+void RenderObjectChildList::updateBeforeAfterContent(RenderObject* owner, RenderStyle::PseudoId type, RenderObject* styledObject)
+{
+    // Double check that the document did in fact use generated content rules.  Otherwise we should not have been called.
+    ASSERT(owner->document()->usesBeforeAfterRules());
+
+    // In CSS2, before/after pseudo-content cannot nest.  Check this first.
+    if (owner->style()->styleType() == RenderStyle::BEFORE || owner->style()->styleType() == RenderStyle::AFTER)
+        return;
+    
+    if (!styledObject)
+        styledObject = owner;
+
+    RenderStyle* pseudoElementStyle = styledObject->getCachedPseudoStyle(type);
+    RenderObject* child = beforeAfterContainer(owner, type);
+
+    // Whether or not we currently have generated content attached.
+    bool oldContentPresent = child;
+
+    // Whether or not we now want generated content.  
+    bool newContentWanted = pseudoElementStyle && pseudoElementStyle->display() != NONE;
+
+    // For <q><p/></q>, if this object is the inline continuation of the <q>, we only want to generate
+    // :after content and not :before content.
+    if (newContentWanted && type == RenderStyle::BEFORE && owner->isRenderInline() && toRenderInline(owner)->isInlineContinuation())
+        newContentWanted = false;
+
+    // Similarly, if we're the beginning of a <q>, and there's an inline continuation for our object,
+    // then we don't generate the :after content.
+    if (newContentWanted && type == RenderStyle::AFTER && owner->isRenderInline() && toRenderInline(owner)->continuation())
+        newContentWanted = false;
+    
+    // If we don't want generated content any longer, or if we have generated content, but it's no longer
+    // identical to the new content data we want to build render objects for, then we nuke all
+    // of the old generated content.
+    if (!newContentWanted || (oldContentPresent && Node::diff(child->style(), pseudoElementStyle) == Node::Detach)) {
+        // Nuke the child. 
+        if (child && child->style()->styleType() == type) {
+            oldContentPresent = false;
+            child->destroy();
+            child = (type == RenderStyle::BEFORE) ? owner->virtualChildren()->firstChild() : owner->virtualChildren()->lastChild();
+        }
+    }
+
+    // If we have no pseudo-element style or if the pseudo-element style's display type is NONE, then we
+    // have no generated content and can now return.
+    if (!newContentWanted)
+        return;
+
+    if (owner->isRenderInline() && !pseudoElementStyle->isDisplayInlineType() && pseudoElementStyle->floating() == FNONE &&
+        !(pseudoElementStyle->position() == AbsolutePosition || pseudoElementStyle->position() == FixedPosition))
+        // According to the CSS2 spec (the end of section 12.1), the only allowed
+        // display values for the pseudo style are NONE and INLINE for inline flows.
+        // FIXME: CSS2.1 lifted this restriction, but block display types will crash.
+        // For now we at least relax the restriction to allow all inline types like inline-block
+        // and inline-table.
+        pseudoElementStyle->setDisplay(INLINE);
+
+    if (oldContentPresent) {
+        if (child && child->style()->styleType() == type) {
+            // We have generated content present still.  We want to walk this content and update our
+            // style information with the new pseudo-element style.
+            child->setStyle(pseudoElementStyle);
+
+            RenderObject* beforeAfterParent = findBeforeAfterParent(child);
+            if (!beforeAfterParent)
+                return;
+
+            // Note that if we ever support additional types of generated content (which should be way off
+            // in the future), this code will need to be patched.
+            for (RenderObject* genChild = beforeAfterParent->firstChild(); genChild; genChild = genChild->nextSibling()) {
+                if (genChild->isText())
+                    // Generated text content is a child whose style also needs to be set to the pseudo-element style.
+                    genChild->setStyle(pseudoElementStyle);
+                else if (genChild->isImage()) {
+                    // Images get an empty style that inherits from the pseudo.
+                    RefPtr<RenderStyle> style = RenderStyle::create();
+                    style->inheritFrom(pseudoElementStyle);
+                    genChild->setStyle(style.release());
+                } else
+                    // Must be a first-letter container. updateFirstLetter() will take care of it.
+                    ASSERT(genChild->style()->styleType() == RenderStyle::FIRST_LETTER);
+            }
+        }
+        return; // We've updated the generated content. That's all we needed to do.
+    }
+    
+    RenderObject* insertBefore = (type == RenderStyle::BEFORE) ? owner->virtualChildren()->firstChild() : 0;
+
+    // Generated content consists of a single container that houses multiple children (specified
+    // by the content property).  This generated content container gets the pseudo-element style set on it.
+    RenderObject* generatedContentContainer = 0;
+    
+    // Walk our list of generated content and create render objects for each.
+    for (const ContentData* content = pseudoElementStyle->contentData(); content; content = content->m_next) {
+        RenderObject* renderer = 0;
+        switch (content->m_type) {
+            case CONTENT_NONE:
+                break;
+            case CONTENT_TEXT:
+                renderer = new (owner->renderArena()) RenderTextFragment(owner->document() /* anonymous object */, content->m_content.m_text);
+                renderer->setStyle(pseudoElementStyle);
+                break;
+            case CONTENT_OBJECT: {
+                RenderImageGeneratedContent* image = new (owner->renderArena()) RenderImageGeneratedContent(owner->document()); // anonymous object
+                RefPtr<RenderStyle> style = RenderStyle::create();
+                style->inheritFrom(pseudoElementStyle);
+                image->setStyle(style.release());
+                if (StyleImage* styleImage = content->m_content.m_image)
+                    image->setStyleImage(styleImage);
+                renderer = image;
+                break;
+            }
+            case CONTENT_COUNTER:
+                renderer = new (owner->renderArena()) RenderCounter(owner->document(), *content->m_content.m_counter);
+                renderer->setStyle(pseudoElementStyle);
+                break;
+        }
+
+        if (renderer) {
+            if (!generatedContentContainer) {
+                // Make a generated box that might be any display type now that we are able to drill down into children
+                // to find the original content properly.
+                generatedContentContainer = RenderObject::createObject(owner->document(), pseudoElementStyle);
+                generatedContentContainer->setStyle(pseudoElementStyle);
+                owner->addChild(generatedContentContainer, insertBefore);
+            }
+            generatedContentContainer->addChild(renderer);
+        }
+    }
+}
+
+} // namespace WebCore