1 /* 2 * Copyright (C) 2007 Apple 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 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef LayoutState_h 27 #define LayoutState_h 28 29 #include "core/rendering/ColumnInfo.h" 30 #include "platform/geometry/LayoutRect.h" 31 #include "wtf/HashMap.h" 32 #include "wtf/Noncopyable.h" 33 34 namespace WebCore { 35 36 class ForceHorriblySlowRectMapping; 37 class RenderBox; 38 class RenderObject; 39 class RenderView; 40 41 class LayoutState { 42 WTF_MAKE_NONCOPYABLE(LayoutState); 43 public: 44 // Constructor for root LayoutState created by RenderView 45 LayoutState(LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, RenderView&); 46 // Constructor for sub-tree Layout and RenderTableSections 47 explicit LayoutState(RenderObject& root); 48 49 LayoutState(RenderBox&, const LayoutSize& offset, LayoutUnit pageLogicalHeight = 0, bool pageHeightLogicalChanged = false, ColumnInfo* = 0); 50 51 ~LayoutState(); 52 53 void clearPaginationInformation(); 54 bool isPaginatingColumns() const { return m_columnInfo; } 55 bool isPaginated() const { return m_isPaginated; } 56 bool isClipped() const { return m_clipped; } 57 58 // The page logical offset is the object's offset from the top of the page in the page progression 59 // direction (so an x-offset in vertical text and a y-offset for horizontal text). 60 LayoutUnit pageLogicalOffset(const RenderBox&, const LayoutUnit& childLogicalOffset) const; 61 62 void addForcedColumnBreak(const RenderBox&, const LayoutUnit& childLogicalOffset); 63 64 void addLayoutDelta(const LayoutSize& delta) 65 { 66 m_layoutDelta += delta; 67 #if ASSERT_ENABLED 68 m_layoutDeltaXSaturated |= m_layoutDelta.width() == LayoutUnit::max() || m_layoutDelta.width() == LayoutUnit::min(); 69 m_layoutDeltaYSaturated |= m_layoutDelta.height() == LayoutUnit::max() || m_layoutDelta.height() == LayoutUnit::min(); 70 #endif 71 } 72 73 void setColumnInfo(ColumnInfo* columnInfo) { m_columnInfo = columnInfo; } 74 75 const LayoutSize& layoutOffset() const { return m_layoutOffset; } 76 const LayoutSize& layoutDelta() const { return m_layoutDelta; } 77 const LayoutSize& pageOffset() const { return m_pageOffset; } 78 LayoutUnit pageLogicalHeight() const { return m_pageLogicalHeight; } 79 bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; } 80 81 LayoutState* next() const { return m_next; } 82 83 bool needsBlockDirectionLocationSetBeforeLayout() const { return m_isPaginated && m_pageLogicalHeight; } 84 85 ColumnInfo* columnInfo() const { return m_columnInfo; } 86 87 bool cachedOffsetsEnabled() const { return m_cachedOffsetsEnabled; } 88 89 const LayoutRect& clipRect() const 90 { 91 ASSERT(m_cachedOffsetsEnabled); 92 return m_clipRect; 93 } 94 const LayoutSize& paintOffset() const 95 { 96 ASSERT(m_cachedOffsetsEnabled); 97 return m_paintOffset; 98 } 99 100 101 RenderObject& renderer() const { return m_renderer; } 102 103 #if ASSERT_ENABLED 104 bool layoutDeltaXSaturated() const { return m_layoutDeltaXSaturated; } 105 bool layoutDeltaYSaturated() const { return m_layoutDeltaYSaturated; } 106 #endif 107 108 private: 109 friend class ForceHorriblySlowRectMapping; 110 111 // Do not add anything apart from bitfields until after m_columnInfo. See https://bugs.webkit.org/show_bug.cgi?id=100173 112 bool m_clipped:1; 113 bool m_isPaginated:1; 114 // If our page height has changed, this will force all blocks to relayout. 115 bool m_pageLogicalHeightChanged:1; 116 117 bool m_cachedOffsetsEnabled:1; 118 #if ASSERT_ENABLED 119 bool m_layoutDeltaXSaturated:1; 120 bool m_layoutDeltaYSaturated:1; 121 #endif 122 // If the enclosing pagination model is a column model, then this will store column information for easy retrieval/manipulation. 123 ColumnInfo* m_columnInfo; 124 LayoutState* m_next; 125 126 // FIXME: Distinguish between the layout clip rect and the paint clip rect which may be larger, 127 // e.g., because of composited scrolling. 128 LayoutRect m_clipRect; 129 130 // x/y offset from container. Includes relative positioning and scroll offsets. 131 LayoutSize m_paintOffset; 132 // x/y offset from container. Does not include relative positioning or scroll offsets. 133 LayoutSize m_layoutOffset; 134 // Transient offset from the final position of the object 135 // used to ensure that repaints happen in the correct place. 136 // This is a total delta accumulated from the root. 137 LayoutSize m_layoutDelta; 138 139 // The current page height for the pagination model that encloses us. 140 LayoutUnit m_pageLogicalHeight; 141 // The offset of the start of the first page in the nearest enclosing pagination model. 142 LayoutSize m_pageOffset; 143 144 RenderObject& m_renderer; 145 }; 146 147 } // namespace WebCore 148 149 #endif // LayoutState_h 150
