1 /* 2 * Copyright (C) 2011 Adobe Systems Incorporated. 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 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above 9 * copyright notice, this list of conditions and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following 13 * disclaimer in the documentation and/or other materials 14 * provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AS IS AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 25 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 26 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef RenderRegion_h 31 #define RenderRegion_h 32 33 #include "core/rendering/RenderBlockFlow.h" 34 #include "core/rendering/style/StyleInheritedData.h" 35 36 namespace WebCore { 37 38 struct LayerFragment; 39 typedef Vector<LayerFragment, 1> LayerFragments; 40 class RenderFlowThread; 41 42 class RenderRegion : public RenderBlockFlow { 43 public: 44 explicit RenderRegion(Element*, RenderFlowThread*); 45 46 virtual bool isRenderRegion() const OVERRIDE FINAL { return true; } 47 48 void setFlowThreadPortionRect(const LayoutRect& rect) { m_flowThreadPortionRect = rect; } 49 LayoutRect flowThreadPortionRect() const { return m_flowThreadPortionRect; } 50 LayoutRect flowThreadPortionOverflowRect() const; 51 52 void attachRegion(); 53 void detachRegion(); 54 55 RenderFlowThread* flowThread() const { return m_flowThread; } 56 57 // Valid regions do not create circular dependencies with other flows. 58 bool isValid() const { return m_isValid; } 59 void setIsValid(bool valid) { m_isValid = valid; } 60 61 bool isFirstRegion() const; 62 bool isLastRegion() const; 63 64 // These methods represent the width and height of a "page" and for a RenderRegion they are just 65 // the content width and content height of a region. For RenderMultiColumnSets, however, they 66 // will be the width and height of a single column or page in the set. 67 virtual LayoutUnit pageLogicalWidth() const; 68 virtual LayoutUnit pageLogicalHeight() const; 69 70 LayoutUnit logicalTopOfFlowThreadContentRect(const LayoutRect&) const; 71 LayoutUnit logicalBottomOfFlowThreadContentRect(const LayoutRect&) const; 72 LayoutUnit logicalTopForFlowThreadContent() const { return logicalTopOfFlowThreadContentRect(flowThreadPortionRect()); }; 73 LayoutUnit logicalBottomForFlowThreadContent() const { return logicalBottomOfFlowThreadContentRect(flowThreadPortionRect()); }; 74 75 // This method represents the logical height of the entire flow thread portion used by the region or set. 76 // For RenderRegions it matches logicalPaginationHeight(), but for sets it is the height of all the pages 77 // or columns added together. 78 virtual LayoutUnit logicalHeightOfAllFlowThreadContent() const; 79 80 // The top of the nearest page inside the region. For RenderRegions, this is just the logical top of the 81 // flow thread portion we contain. For sets, we have to figure out the top of the nearest column or 82 // page. 83 virtual LayoutUnit pageLogicalTopForOffset(LayoutUnit offset) const; 84 85 virtual void repaintFlowThreadContent(const LayoutRect& repaintRect) const; 86 87 virtual void collectLayerFragments(LayerFragments&, const LayoutRect&, const LayoutRect&) { } 88 89 virtual bool canHaveChildren() const OVERRIDE FINAL { return false; } 90 virtual bool canHaveGeneratedChildren() const OVERRIDE FINAL { return true; } 91 92 virtual const char* renderName() const OVERRIDE { return "RenderRegion"; } 93 94 protected: 95 virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE FINAL; 96 97 LayoutRect overflowRectForFlowThreadPortion(const LayoutRect& flowThreadPortionRect, bool isFirstPortion, bool isLastPortion) const; 98 void repaintFlowThreadContentRectangle(const LayoutRect& repaintRect, const LayoutRect& flowThreadPortionRect, 99 const LayoutRect& flowThreadPortionOverflowRect, const LayoutPoint& regionLocation) const; 100 101 private: 102 virtual void insertedIntoTree() OVERRIDE FINAL; 103 virtual void willBeRemovedFromTree() OVERRIDE FINAL; 104 105 virtual void layoutBlock(bool relayoutChildren) OVERRIDE FINAL; 106 107 protected: 108 RenderFlowThread* m_flowThread; 109 110 private: 111 LayoutRect m_flowThreadPortionRect; 112 bool m_isValid : 1; 113 }; 114 115 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderRegion, isRenderRegion()); 116 117 } // namespace WebCore 118 119 #endif // RenderRegion_h 120
