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30 #ifndef RenderRegion_h
31 #define RenderRegion_h
33 #include "core/rendering/RenderBlockFlow.h"
34 #include "core/rendering/style/StyleInheritedData.h"
39 typedef Vector<LayerFragment, 1> LayerFragments;
41 class RenderFlowThread;
43 class RenderRegion : public RenderBlockFlow {
45 explicit RenderRegion(Element*, RenderFlowThread*);
47 virtual bool isRenderRegion() const OVERRIDE FINAL { return true; }
49 void setFlowThreadPortionRect(const LayoutRect& rect) { m_flowThreadPortionRect = rect; }
50 LayoutRect flowThreadPortionRect() const { return m_flowThreadPortionRect; }
51 LayoutRect flowThreadPortionOverflowRect() const;
56 RenderFlowThread* flowThread() const { return m_flowThread; }
58 // Valid regions do not create circular dependencies with other flows.
59 bool isValid() const { return m_isValid; }
60 void setIsValid(bool valid) { m_isValid = valid; }
62 bool isFirstRegion() const;
63 bool isLastRegion() const;
65 // These methods represent the width and height of a "page" and for a RenderRegion they are just the
66 // content width and content height of a region. For RenderRegionSets, however, they will be the width and
67 // height of a single column or page in the set.
68 virtual LayoutUnit pageLogicalWidth() const;
69 virtual LayoutUnit pageLogicalHeight() const;
71 LayoutUnit logicalTopOfFlowThreadContentRect(const LayoutRect&) const;
72 LayoutUnit logicalBottomOfFlowThreadContentRect(const LayoutRect&) const;
73 LayoutUnit logicalTopForFlowThreadContent() const { return logicalTopOfFlowThreadContentRect(flowThreadPortionRect()); };
74 LayoutUnit logicalBottomForFlowThreadContent() const { return logicalBottomOfFlowThreadContentRect(flowThreadPortionRect()); };
76 // This method represents the logical height of the entire flow thread portion used by the region or set.
77 // For RenderRegions it matches logicalPaginationHeight(), but for sets it is the height of all the pages
78 // or columns added together.
79 virtual LayoutUnit logicalHeightOfAllFlowThreadContent() const;
81 // The top of the nearest page inside the region. For RenderRegions, this is just the logical top of the
82 // flow thread portion we contain. For sets, we have to figure out the top of the nearest column or
84 virtual LayoutUnit pageLogicalTopForOffset(LayoutUnit offset) const;
86 virtual void expandToEncompassFlowThreadContentsIfNeeded() { };
88 virtual void repaintFlowThreadContent(const LayoutRect& repaintRect) const;
90 virtual void collectLayerFragments(LayerFragments&, const LayoutRect&, const LayoutRect&) { }
92 virtual bool canHaveChildren() const OVERRIDE FINAL { return false; }
93 virtual bool canHaveGeneratedChildren() const OVERRIDE FINAL { return true; }
95 virtual const char* renderName() const OVERRIDE { return "RenderRegion"; }
98 virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE FINAL;
100 LayoutRect overflowRectForFlowThreadPortion(const LayoutRect& flowThreadPortionRect, bool isFirstPortion, bool isLastPortion) const;
101 void repaintFlowThreadContentRectangle(const LayoutRect& repaintRect, const LayoutRect& flowThreadPortionRect,
102 const LayoutRect& flowThreadPortionOverflowRect, const LayoutPoint& regionLocation) const;
105 virtual void insertedIntoTree() OVERRIDE FINAL;
106 virtual void willBeRemovedFromTree() OVERRIDE FINAL;
108 virtual void layoutBlock(bool relayoutChildren) OVERRIDE FINAL;
109 virtual bool supportsPartialLayout() const OVERRIDE FINAL { return false; }
112 RenderFlowThread* m_flowThread;
115 LayoutRect m_flowThreadPortionRect;
119 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderRegion, isRenderRegion());
121 } // namespace WebCore
123 #endif // RenderRegion_h