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27 #ifndef RenderMultiColumnBlock_h
28 #define RenderMultiColumnBlock_h
30 #include "RenderBlock.h"
34 class RenderMultiColumnFlowThread;
36 class RenderMultiColumnBlock : public RenderBlock {
38 RenderMultiColumnBlock(Node*);
40 LayoutUnit columnHeight() const { return m_columnHeight; }
41 void setColumnHeight(LayoutUnit columnHeight) { m_columnHeight = columnHeight; }
43 LayoutUnit columnWidth() const { return m_columnWidth; }
44 unsigned columnCount() const { return m_columnCount; }
47 virtual bool isRenderMultiColumnBlock() const { return true; }
49 virtual const char* renderName() const;
51 virtual bool recomputeLogicalWidth() OVERRIDE;
52 virtual void checkForPaginationLogicalHeightChange(LayoutUnit& pageLogicalHeight, bool& pageLogicalHeightChanged, bool& hasSpecifiedPageLogicalHeight) OVERRIDE;
53 virtual bool relayoutForPagination(bool hasSpecifiedPageLogicalHeight, LayoutUnit pageLogicalHeight, LayoutStateMaintainer&) OVERRIDE;
55 virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) OVERRIDE;
57 void computeColumnCountAndWidth();
59 void ensureColumnSets();
61 RenderMultiColumnFlowThread* flowThread() const { return m_flowThread; }
63 RenderMultiColumnFlowThread* m_flowThread;
64 unsigned m_columnCount; // The default column count/width that are based off our containing block width. These values represent only the default,
65 LayoutUnit m_columnWidth; // since a multi-column block that is split across variable width pages or regions will have different column counts and widths in each.
66 // These values will be cached (eventually) for multi-column blocks.
67 LayoutUnit m_columnHeight; // The current column height.
70 inline RenderMultiColumnBlock* toRenderMultiColumnBlock(RenderObject* object)
72 ASSERT(!object || object->isRenderMultiColumnBlock());
73 return static_cast<RenderMultiColumnBlock*>(object);
76 inline const RenderMultiColumnBlock* toRenderMultiColumnBlock(const RenderObject* object)
78 ASSERT(!object || object->isRenderMultiColumnBlock());
79 return static_cast<const RenderMultiColumnBlock*>(object);
82 // This will catch anyone doing an unnecessary cast.
83 void toRenderMultiColumnBlock(const RenderMultiColumnBlock*);
85 } // namespace WebCore
87 #endif // RenderMultiColumnBlock_h