1/* 2 * Copyright (C) 2011 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#ifndef RenderFlexibleBox_h 32#define RenderFlexibleBox_h 33 34#include "RenderBlock.h" 35 36namespace WebCore { 37 38class RenderFlexibleBox : public RenderBlock { 39public: 40 RenderFlexibleBox(Element*); 41 virtual ~RenderFlexibleBox(); 42 43 static RenderFlexibleBox* createAnonymous(Document*); 44 45 virtual const char* renderName() const OVERRIDE; 46 47 virtual bool isFlexibleBox() const OVERRIDE { return true; } 48 virtual bool avoidsFloats() const OVERRIDE { return true; } 49 virtual bool canCollapseAnonymousBlockChild() const OVERRIDE { return false; } 50 virtual void layoutBlock(bool relayoutChildren, LayoutUnit pageLogicalHeight = 0) OVERRIDE; 51 52 virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const OVERRIDE; 53 virtual int firstLineBoxBaseline() const OVERRIDE; 54 virtual int inlineBlockBaseline(LineDirectionMode) const OVERRIDE; 55 56 virtual void paintChildren(PaintInfo& forSelf, const LayoutPoint&, PaintInfo& forChild, bool usePrintRect) OVERRIDE; 57 58 bool isHorizontalFlow() const; 59 60protected: 61 virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE; 62 virtual void computePreferredLogicalWidths() OVERRIDE; 63 64 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); 65 66private: 67 enum FlexSign { 68 PositiveFlexibility, 69 NegativeFlexibility, 70 }; 71 72 enum PositionedLayoutMode { 73 FlipForRowReverse, 74 NoFlipForRowReverse, 75 }; 76 77 struct OrderHashTraits; 78 typedef HashSet<int, DefaultHash<int>::Hash, OrderHashTraits> OrderHashSet; 79 80 class OrderIterator { 81 WTF_MAKE_NONCOPYABLE(OrderIterator); 82 public: 83 OrderIterator(const RenderFlexibleBox*); 84 void setOrderValues(const OrderHashSet&); 85 RenderBox* currentChild() const { return m_currentChild; } 86 RenderBox* first(); 87 RenderBox* next(); 88 void reset(); 89 90 private: 91 const RenderFlexibleBox* m_flexibleBox; 92 RenderBox* m_currentChild; 93 Vector<int> m_orderValues; 94 Vector<int>::const_iterator m_orderValuesIterator; 95 }; 96 97 typedef HashMap<const RenderBox*, LayoutUnit> InflexibleFlexItemSize; 98 typedef Vector<RenderBox*> OrderedFlexItemList; 99 100 struct LineContext; 101 struct Violation; 102 103 // Use an inline capacity of 8, since flexbox containers usually have less than 8 children. 104 typedef Vector<LayoutRect, 8> ChildFrameRects; 105 106 bool hasOrthogonalFlow(RenderBox* child) const; 107 bool isColumnFlow() const; 108 bool isLeftToRightFlow() const; 109 bool isMultiline() const; 110 Length flexBasisForChild(RenderBox* child) const; 111 void setCrossAxisExtent(LayoutUnit); 112 LayoutUnit crossAxisExtentForChild(RenderBox* child) const; 113 LayoutUnit mainAxisExtentForChild(RenderBox* child) const; 114 LayoutUnit crossAxisExtent() const; 115 LayoutUnit mainAxisExtent() const; 116 LayoutUnit crossAxisContentExtent() const; 117 LayoutUnit mainAxisContentExtent(LayoutUnit contentLogicalHeight); 118 LayoutUnit computeMainAxisExtentForChild(RenderBox* child, SizeType, const Length& size); 119 WritingMode transformedWritingMode() const; 120 LayoutUnit flowAwareBorderStart() const; 121 LayoutUnit flowAwareBorderEnd() const; 122 LayoutUnit flowAwareBorderBefore() const; 123 LayoutUnit flowAwareBorderAfter() const; 124 LayoutUnit flowAwarePaddingStart() const; 125 LayoutUnit flowAwarePaddingEnd() const; 126 LayoutUnit flowAwarePaddingBefore() const; 127 LayoutUnit flowAwarePaddingAfter() const; 128 LayoutUnit flowAwareMarginStartForChild(RenderBox* child) const; 129 LayoutUnit flowAwareMarginEndForChild(RenderBox* child) const; 130 LayoutUnit flowAwareMarginBeforeForChild(RenderBox* child) const; 131 LayoutUnit flowAwareMarginAfterForChild(RenderBox* child) const; 132 LayoutUnit crossAxisMarginExtentForChild(RenderBox* child) const; 133 LayoutUnit crossAxisScrollbarExtent() const; 134 LayoutPoint flowAwareLocationForChild(RenderBox* child) const; 135 // FIXME: Supporting layout deltas. 136 void setFlowAwareLocationForChild(RenderBox* child, const LayoutPoint&); 137 void adjustAlignmentForChild(RenderBox* child, LayoutUnit); 138 EAlignItems alignmentForChild(RenderBox* child) const; 139 LayoutUnit mainAxisBorderAndPaddingExtentForChild(RenderBox* child) const; 140 LayoutUnit mainAxisScrollbarExtentForChild(RenderBox* child) const; 141 LayoutUnit preferredMainAxisContentExtentForChild(RenderBox* child, bool hasInfiniteLineLength); 142 143 void layoutFlexItems(bool relayoutChildren, Vector<LineContext>&); 144 LayoutUnit autoMarginOffsetInMainAxis(const OrderedFlexItemList&, LayoutUnit& availableFreeSpace); 145 void updateAutoMarginsInMainAxis(RenderBox* child, LayoutUnit autoMarginOffset); 146 bool hasAutoMarginsInCrossAxis(RenderBox* child) const; 147 bool updateAutoMarginsInCrossAxis(RenderBox* child, LayoutUnit availableAlignmentSpace); 148 void repositionLogicalHeightDependentFlexItems(Vector<LineContext>&); 149 LayoutUnit clientLogicalBottomAfterRepositioning(); 150 void appendChildFrameRects(ChildFrameRects&); 151 void repaintChildrenDuringLayoutIfMoved(const ChildFrameRects&); 152 153 LayoutUnit availableAlignmentSpaceForChild(LayoutUnit lineCrossAxisExtent, RenderBox*); 154 LayoutUnit marginBoxAscentForChild(RenderBox*); 155 156 LayoutUnit computeChildMarginValue(Length margin, RenderView*); 157 void computeMainAxisPreferredSizes(OrderHashSet&); 158 LayoutUnit adjustChildSizeForMinAndMax(RenderBox*, LayoutUnit childSize); 159 bool computeNextFlexLine(OrderedFlexItemList& orderedChildren, LayoutUnit& preferredMainAxisExtent, double& totalFlexGrow, double& totalWeightedFlexShrink, LayoutUnit& minMaxAppliedMainAxisExtent, bool& hasInfiniteLineLength); 160 161 bool resolveFlexibleLengths(FlexSign, const OrderedFlexItemList&, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalWeightedFlexShrink, InflexibleFlexItemSize&, Vector<LayoutUnit>& childSizes, bool hasInfiniteLineLength); 162 void freezeViolations(const Vector<Violation>&, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalWeightedFlexShrink, InflexibleFlexItemSize&, bool hasInfiniteLineLength); 163 164 void resetAutoMarginsAndLogicalTopInCrossAxis(RenderBox*); 165 bool needToStretchChild(RenderBox*); 166 void setLogicalOverrideSize(RenderBox* child, LayoutUnit childPreferredSize); 167 void prepareChildForPositionedLayout(RenderBox* child, LayoutUnit mainAxisOffset, LayoutUnit crossAxisOffset, PositionedLayoutMode); 168 size_t numberOfInFlowPositionedChildren(const OrderedFlexItemList&) const; 169 void layoutAndPlaceChildren(LayoutUnit& crossAxisOffset, const OrderedFlexItemList&, const Vector<LayoutUnit>& childSizes, LayoutUnit availableFreeSpace, bool relayoutChildren, Vector<LineContext>&); 170 void layoutColumnReverse(const OrderedFlexItemList&, LayoutUnit crossAxisOffset, LayoutUnit availableFreeSpace); 171 void alignFlexLines(Vector<LineContext>&); 172 void alignChildren(const Vector<LineContext>&); 173 void applyStretchAlignmentToChild(RenderBox*, LayoutUnit lineCrossAxisExtent); 174 void flipForRightToLeftColumn(); 175 void flipForWrapReverse(const Vector<LineContext>&, LayoutUnit crossAxisStartEdge); 176 177 mutable OrderIterator m_orderIterator; 178 int m_numberOfInFlowChildrenOnFirstLine; 179}; 180 181inline RenderFlexibleBox* toRenderFlexibleBox(RenderObject* object) 182{ 183 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isFlexibleBox()); 184 return static_cast<RenderFlexibleBox*>(object); 185} 186 187inline const RenderFlexibleBox* toRenderFlexibleBox(const RenderObject* object) 188{ 189 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isFlexibleBox()); 190 return static_cast<const RenderFlexibleBox*>(object); 191} 192 193// This will catch anyone doing an unnecessary cast. 194void toRenderFlexibleBox(const RenderFlexibleBox*); 195 196} // namespace WebCore 197 198#endif // RenderFlexibleBox_h 199