[css-align] New CSS Value 'normal' for Self Alignment

third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 24 matching lines @@
 #include "core/layout/TextAutosizer.h"
 #include "core/paint/BlockPainter.h"
 #include "core/paint/PaintLayer.h"
 #include "core/style/ComputedStyle.h"
 #include "platform/LengthFunctions.h"
 #include "wtf/MathExtras.h"
 #include <limits>
 
 namespace blink {
 
+static const ItemPosition selfAlignmentNormalBehavior = ItemPositionStretch;
+
 static bool hasAspectRatio(const LayoutBox& child)
 {
     return child.isImage() || child.isCanvas() || child.isVideo();
 }
 
 struct LayoutFlexibleBox::LineContext {
     LineContext(LayoutUnit crossAxisOffset, LayoutUnit crossAxisExtent, size_t numberOfChildren, LayoutUnit maxAscent)
         : crossAxisOffset(crossAxisOffset)
         , crossAxisExtent(crossAxisExtent)
         , numberOfChildren(numberOfChildren)
@@ skipping 13 matching lines @@
         , childSize(childSize)
         , childInnerFlexBaseSize(childInnerFlexBaseSize)
     {
     }
 
     LayoutBox* child;
     LayoutUnit childSize;
     LayoutUnit childInnerFlexBaseSize;
 };
 
-
 LayoutFlexibleBox::LayoutFlexibleBox(Element* element)
     : LayoutBlock(element)
     , m_orderIterator(this)
     , m_numberOfInFlowChildrenOnFirstLine(-1)
 {
     ASSERT(!childrenInline());
 }
 
 LayoutFlexibleBox::~LayoutFlexibleBox()
 {
@@ skipping 85 matching lines @@
 int LayoutFlexibleBox::baselinePosition(FontBaseline, bool, LineDirectionMode direction, LinePositionMode mode) const
 {
     ASSERT(mode == PositionOnContainingLine);
     int baseline = firstLineBoxBaseline();
     if (baseline == -1)
         baseline = synthesizedBaselineFromContentBox(*this, direction);
 
     return beforeMarginInLineDirection(direction) + baseline;
 }
 
-static const StyleContentAlignmentData& normalValueBehavior()
+static const StyleContentAlignmentData& contentAlignmentNormalBehavior()
 {
     // The justify-content property applies along the main axis, but since flexing
     // in the main axis is controlled by flex, stretch behaves as flex-start (ignoring
     // the specified fallback alignment, if any).
     // https://drafts.csswg.org/css-align/#distribution-flex
     static const StyleContentAlignmentData normalBehavior = {ContentPositionNormal, ContentDistributionStretch};
     return normalBehavior;
 }
 
 int LayoutFlexibleBox::firstLineBoxBaseline() const
@@ skipping 49 matching lines @@
 void LayoutFlexibleBox::removeChild(LayoutObject* child)
 {
     LayoutBlock::removeChild(child);
     m_intrinsicSizeAlongMainAxis.remove(child);
 }
 
 void LayoutFlexibleBox::styleDidChange(StyleDifference diff, const ComputedStyle* oldStyle)
 {
     LayoutBlock::styleDidChange(diff, oldStyle);
 
-    if (oldStyle && oldStyle->alignItemsPosition() == ItemPositionStretch && diff.needsFullLayout()) {
+    if (oldStyle && oldStyle->resolvedAlignItems(selfAlignmentNormalBehavior).position() == ItemPositionStretch && diff.needsFullLayout()) {
         // Flex items that were previously stretching need to be relayed out so we can compute new available cross axis space.
         // This is only necessary for stretching since other alignment values don't change the size of the box.
+        const ComputedStyle& newStyle = styleRef();
         for (LayoutBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
-            ItemPosition previousAlignment = ComputedStyle::resolveAlignment(*oldStyle, child->styleRef(), ItemPositionStretch);
-            if (previousAlignment == ItemPositionStretch && previousAlignment != ComputedStyle::resolveAlignment(styleRef(), child->styleRef(), ItemPositionStretch))
+            const ComputedStyle& childStyle = child->styleRef();
+            ItemPosition previousAlignment = childStyle.resolvedAlignSelf(*oldStyle, selfAlignmentNormalBehavior).position();
+            if (previousAlignment == ItemPositionStretch && previousAlignment != childStyle.resolvedAlignSelf(newStyle, selfAlignmentNormalBehavior).position())
                 child->setChildNeedsLayout(MarkOnlyThis);
         }
     }
 }
 
 void LayoutFlexibleBox::layoutBlock(bool relayoutChildren)
 {
     ASSERT(needsLayout());
 
     if (!relayoutChildren && simplifiedLayout())
@@ skipping 948 matching lines @@
     LayoutUnit staticBlockPosition = isColumnFlow() ? mainAxisOffset : crossAxisOffset;
     if (childLayer->staticBlockPosition() != staticBlockPosition) {
         childLayer->setStaticBlockPosition(staticBlockPosition);
         if (child.style()->hasStaticBlockPosition(style()->isHorizontalWritingMode()))
             child.setChildNeedsLayout(MarkOnlyThis);
     }
 }
 
 ItemPosition LayoutFlexibleBox::alignmentForChild(const LayoutBox& child) const
 {
-    ItemPosition align = ComputedStyle::resolveAlignment(styleRef(), child.styleRef(), ItemPositionStretch);
+    ItemPosition align = child.styleRef().resolvedAlignSelf(styleRef(), selfAlignmentNormalBehavior).position();
 
     if (align == ItemPositionBaseline && hasOrthogonalFlow(child))
         align = ItemPositionFlexStart;
 
     if (style()->flexWrap() == FlexWrapReverse) {
         if (align == ItemPositionFlexStart)
             align = ItemPositionFlexEnd;
         else if (align == ItemPositionFlexEnd)
             align = ItemPositionFlexStart;
     }
@@ skipping 72 matching lines @@
 {
     if (isHorizontalFlow())
         return child.styleRef().overflowY();
     return child.styleRef().overflowX();
 }
 
 void LayoutFlexibleBox::layoutAndPlaceChildren(LayoutUnit& crossAxisOffset, const OrderedFlexItemList& children, const Vector<LayoutUnit, 16>& childSizes, LayoutUnit availableFreeSpace, bool relayoutChildren, SubtreeLayoutScope& layoutScope, Vector<LineContext>& lineContexts)
 {
     ASSERT(childSizes.size() == children.size());
 
-    ContentPosition position = styleRef().resolvedJustifyContentPosition(normalValueBehavior());
-    ContentDistributionType distribution = styleRef().resolvedJustifyContentDistribution(normalValueBehavior());
+    ContentPosition position = styleRef().resolvedJustifyContentPosition(contentAlignmentNormalBehavior());
+    ContentDistributionType distribution = styleRef().resolvedJustifyContentDistribution(contentAlignmentNormalBehavior());
 
     size_t numberOfChildrenForJustifyContent = numberOfInFlowPositionedChildren(children);
     LayoutUnit autoMarginOffset = autoMarginOffsetInMainAxis(children, availableFreeSpace);
     LayoutUnit mainAxisOffset = flowAwareBorderStart() + flowAwarePaddingStart();
     mainAxisOffset += initialJustifyContentOffset(availableFreeSpace, position, distribution, numberOfChildrenForJustifyContent);
     if (style()->flexDirection() == FlowRowReverse)
         mainAxisOffset += isHorizontalFlow() ? verticalScrollbarWidth() : horizontalScrollbarHeight();
 
     LayoutUnit totalMainExtent = mainAxisExtent();
     LayoutUnit maxAscent, maxDescent; // Used when align-items: baseline.
@@ skipping 72 matching lines @@
     }
 
     if (m_numberOfInFlowChildrenOnFirstLine == -1)
         m_numberOfInFlowChildrenOnFirstLine = seenInFlowPositionedChildren;
     lineContexts.append(LineContext(crossAxisOffset, maxChildCrossAxisExtent, children.size(), maxAscent));
     crossAxisOffset += maxChildCrossAxisExtent;
 }
 
 void LayoutFlexibleBox::layoutColumnReverse(const OrderedFlexItemList& children, LayoutUnit crossAxisOffset, LayoutUnit availableFreeSpace)
 {
-    ContentPosition position = styleRef().resolvedJustifyContentPosition(normalValueBehavior());
-    ContentDistributionType distribution = styleRef().resolvedJustifyContentDistribution(normalValueBehavior());
+    ContentPosition position = styleRef().resolvedJustifyContentPosition(contentAlignmentNormalBehavior());
+    ContentDistributionType distribution = styleRef().resolvedJustifyContentDistribution(contentAlignmentNormalBehavior());
 
     // This is similar to the logic in layoutAndPlaceChildren, except we place the children
     // starting from the end of the flexbox. We also don't need to layout anything since we're
     // just moving the children to a new position.
     size_t numberOfChildrenForJustifyContent = numberOfInFlowPositionedChildren(children);
     LayoutUnit mainAxisOffset = logicalHeight() - flowAwareBorderEnd() - flowAwarePaddingEnd();
     mainAxisOffset -= initialJustifyContentOffset(availableFreeSpace, position, distribution, numberOfChildrenForJustifyContent);
     mainAxisOffset -= isHorizontalFlow() ? verticalScrollbarWidth() : horizontalScrollbarHeight();
 
     size_t seenInFlowPositionedChildren = 0;
@@ skipping 39 matching lines @@
         if (alignContentDistribution == ContentDistributionSpaceBetween)
             return availableFreeSpace / (numberOfLines - 1);
         if (alignContentDistribution == ContentDistributionSpaceAround || alignContentDistribution == ContentDistributionStretch)
             return availableFreeSpace / numberOfLines;
     }
     return LayoutUnit();
 }
 
 void LayoutFlexibleBox::alignFlexLines(Vector<LineContext>& lineContexts)
 {
-    ContentPosition position = styleRef().resolvedAlignContentPosition(normalValueBehavior());
-    ContentDistributionType distribution = styleRef().resolvedAlignContentDistribution(normalValueBehavior());
+    ContentPosition position = styleRef().resolvedAlignContentPosition(contentAlignmentNormalBehavior());
+    ContentDistributionType distribution = styleRef().resolvedAlignContentDistribution(contentAlignmentNormalBehavior());
 
     // If we have a single line flexbox or a multiline line flexbox with only one flex line,
     // the line height is all the available space.
     // For flex-direction: row, this means we need to use the height, so we do this after calling updateLogicalHeight.
     if (lineContexts.size() == 1) {
         lineContexts[0].crossAxisExtent = crossAxisContentExtent();
         return;
     }
 
     if (position == ContentPositionFlexStart)
@@ skipping 49 matching lines @@
                 if (style()->flexWrap() == FlexWrapReverse)
                     adjustAlignmentForChild(*child, lineCrossAxisExtent);
                 continue;
             }
 
             if (updateAutoMarginsInCrossAxis(*child, std::max(LayoutUnit(), availableAlignmentSpaceForChild(lineCrossAxisExtent, *child))))
                 continue;
 
             switch (alignmentForChild(*child)) {
             case ItemPositionAuto:
+            case ItemPositionNormal:
                 ASSERT_NOT_REACHED();
                 break;
             case ItemPositionStretch: {
                 applyStretchAlignmentToChild(*child, lineCrossAxisExtent);
                 // Since wrap-reverse flips cross start and cross end, strech children should be aligned with the cross end.
                 if (style()->flexWrap() == FlexWrapReverse)
                     adjustAlignmentForChild(*child, availableAlignmentSpaceForChild(lineCrossAxisExtent, *child));
                 break;
             }
             case ItemPositionFlexStart:
@@ skipping 105 matching lines @@
             ASSERT(child);
             LayoutUnit lineCrossAxisExtent = lineContexts[lineNumber].crossAxisExtent;
             LayoutUnit originalOffset = lineContexts[lineNumber].crossAxisOffset - crossAxisStartEdge;
             LayoutUnit newOffset = contentExtent - originalOffset - lineCrossAxisExtent;
             adjustAlignmentForChild(*child, newOffset - originalOffset);
         }
     }
 }
 
 } // namespace blink