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31 #ifndef RenderFlexibleBox_h
32 #define RenderFlexibleBox_h
34 #include "core/rendering/OrderIterator.h"
35 #include "core/rendering/RenderBlock.h"
39 class RenderFlexibleBox : public RenderBlock {
41 RenderFlexibleBox(Element*);
42 virtual ~RenderFlexibleBox();
44 static RenderFlexibleBox* createAnonymous(Document*);
46 virtual const char* renderName() const override;
48 virtual bool isFlexibleBox() const override final { return true; }
49 virtual bool canCollapseAnonymousBlockChild() const override { return false; }
50 virtual void layoutBlock(bool relayoutChildren) override final;
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;
56 virtual void paintChildren(PaintInfo&, const LayoutPoint&) override final;
58 bool isHorizontalFlow() const;
60 OrderIterator& orderIterator() { return m_orderIterator; }
63 virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const override;
65 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
66 virtual void removeChild(RenderObject*) override;
74 enum PositionedLayoutMode {
79 typedef HashMap<const RenderBox*, LayoutUnit> InflexibleFlexItemSize;
80 typedef Vector<RenderBox*> OrderedFlexItemList;
85 // Use an inline capacity of 8, since flexbox containers usually have less than 8 children.
86 typedef Vector<LayoutRect, 8> ChildFrameRects;
88 bool hasOrthogonalFlow(RenderBox& child) const;
89 bool isColumnFlow() const;
90 bool isLeftToRightFlow() const;
91 bool isMultiline() const;
92 Length flexBasisForChild(RenderBox& child) const;
93 LayoutUnit crossAxisExtentForChild(RenderBox& child) const;
94 LayoutUnit crossAxisIntrinsicExtentForChild(RenderBox& child) const;
95 LayoutUnit childIntrinsicHeight(RenderBox& child) const;
96 LayoutUnit childIntrinsicWidth(RenderBox& child) const;
97 LayoutUnit mainAxisExtentForChild(RenderBox& child) const;
98 LayoutUnit crossAxisExtent() const;
99 LayoutUnit mainAxisExtent() const;
100 LayoutUnit crossAxisContentExtent() const;
101 LayoutUnit mainAxisContentExtent(LayoutUnit contentLogicalHeight);
102 LayoutUnit computeMainAxisExtentForChild(RenderBox& child, SizeType, const Length& size);
103 WritingMode transformedWritingMode() const;
104 LayoutUnit flowAwareBorderStart() const;
105 LayoutUnit flowAwareBorderEnd() const;
106 LayoutUnit flowAwareBorderBefore() const;
107 LayoutUnit flowAwareBorderAfter() const;
108 LayoutUnit flowAwarePaddingStart() const;
109 LayoutUnit flowAwarePaddingEnd() const;
110 LayoutUnit flowAwarePaddingBefore() const;
111 LayoutUnit flowAwarePaddingAfter() const;
112 LayoutUnit flowAwareMarginStartForChild(RenderBox& child) const;
113 LayoutUnit flowAwareMarginEndForChild(RenderBox& child) const;
114 LayoutUnit flowAwareMarginBeforeForChild(RenderBox& child) const;
115 LayoutUnit crossAxisMarginExtentForChild(RenderBox& child) const;
116 LayoutUnit crossAxisScrollbarExtent() const;
117 LayoutUnit crossAxisScrollbarExtentForChild(RenderBox& child) const;
118 LayoutPoint flowAwareLocationForChild(RenderBox& child) const;
119 // FIXME: Supporting layout deltas.
120 void setFlowAwareLocationForChild(RenderBox& child, const LayoutPoint&);
121 void adjustAlignmentForChild(RenderBox& child, LayoutUnit);
122 ItemPosition alignmentForChild(RenderBox& child) const;
123 LayoutUnit mainAxisBorderAndPaddingExtentForChild(RenderBox& child) const;
124 LayoutUnit preferredMainAxisContentExtentForChild(RenderBox& child, bool hasInfiniteLineLength, bool relayoutChildren = false);
125 bool childPreferredMainAxisContentExtentRequiresLayout(RenderBox& child, bool hasInfiniteLineLength) const;
126 bool needToStretchChildLogicalHeight(RenderBox& child) const;
128 void layoutFlexItems(bool relayoutChildren);
129 LayoutUnit autoMarginOffsetInMainAxis(const OrderedFlexItemList&, LayoutUnit& availableFreeSpace);
130 void updateAutoMarginsInMainAxis(RenderBox& child, LayoutUnit autoMarginOffset);
131 bool hasAutoMarginsInCrossAxis(RenderBox& child) const;
132 bool updateAutoMarginsInCrossAxis(RenderBox& child, LayoutUnit availableAlignmentSpace);
133 void repositionLogicalHeightDependentFlexItems(Vector<LineContext>&);
134 LayoutUnit clientLogicalBottomAfterRepositioning();
135 void appendChildFrameRects(ChildFrameRects&);
137 LayoutUnit availableAlignmentSpaceForChild(LayoutUnit lineCrossAxisExtent, RenderBox& child);
138 LayoutUnit availableAlignmentSpaceForChildBeforeStretching(LayoutUnit lineCrossAxisExtent, RenderBox& child);
139 LayoutUnit marginBoxAscentForChild(RenderBox& child);
141 LayoutUnit computeChildMarginValue(Length margin);
142 void prepareOrderIteratorAndMargins();
143 LayoutUnit adjustChildSizeForMinAndMax(RenderBox& child, LayoutUnit childSize);
144 // The hypothetical main size of an item is the flex base size clamped according to its min and max main size properties
145 bool computeNextFlexLine(OrderedFlexItemList& orderedChildren, LayoutUnit& sumFlexBaseSize, double& totalFlexGrow, double& totalWeightedFlexShrink, LayoutUnit& sumHypotheticalMainSize, bool& hasInfiniteLineLength, bool relayoutChildren);
147 bool resolveFlexibleLengths(FlexSign, const OrderedFlexItemList&, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalWeightedFlexShrink, InflexibleFlexItemSize&, Vector<LayoutUnit, 16>& childSizes, bool hasInfiniteLineLength);
148 void freezeViolations(const Vector<Violation>&, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalWeightedFlexShrink, InflexibleFlexItemSize&, bool hasInfiniteLineLength);
150 void resetAutoMarginsAndLogicalTopInCrossAxis(RenderBox& child);
151 void setLogicalOverrideSize(RenderBox& child, LayoutUnit childPreferredSize);
152 void prepareChildForPositionedLayout(RenderBox& child, LayoutUnit mainAxisOffset, LayoutUnit crossAxisOffset, PositionedLayoutMode);
153 size_t numberOfInFlowPositionedChildren(const OrderedFlexItemList&) const;
154 void layoutAndPlaceChildren(LayoutUnit& crossAxisOffset, const OrderedFlexItemList&, const Vector<LayoutUnit, 16>& childSizes, LayoutUnit availableFreeSpace, bool relayoutChildren, Vector<LineContext>&, bool hasInfiniteLineLength);
155 void layoutColumnReverse(const OrderedFlexItemList&, LayoutUnit crossAxisOffset, LayoutUnit availableFreeSpace);
156 void alignFlexLines(Vector<LineContext>&);
157 void alignChildren(const Vector<LineContext>&);
158 void applyStretchAlignmentToChild(RenderBox& child, LayoutUnit lineCrossAxisExtent);
159 void flipForRightToLeftColumn();
160 void flipForWrapReverse(const Vector<LineContext>&, LayoutUnit crossAxisStartEdge);
162 // This is used to cache the preferred size for orthogonal flow children so we don't have to relayout to get it
163 HashMap<const RenderObject*, LayoutUnit> m_intrinsicSizeAlongMainAxis;
165 mutable OrderIterator m_orderIterator;
166 int m_numberOfInFlowChildrenOnFirstLine;
169 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderFlexibleBox, isFlexibleBox());
173 #endif // RenderFlexibleBox_h