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 blink { 35 36 class ForceHorriblySlowRectMapping; 37 class RenderBox; 38 class RenderObject; 39 class RenderInline; 40 class RenderView; 41 42 class LayoutState { 43 WTF_MAKE_NONCOPYABLE(LayoutState); 44 public: 45 // Constructor for root LayoutState created by RenderView 46 LayoutState(LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, RenderView&); 47 // Constructor for sub-tree Layout and RenderTableSections 48 explicit LayoutState(RenderObject& root); 49 50 LayoutState(RenderBox&, const LayoutSize& offset, LayoutUnit pageLogicalHeight = 0, bool pageHeightLogicalChanged = false, ColumnInfo* = 0, bool containingBlockLogicalWidthChanged = false); 51 LayoutState(RenderInline&); 52 53 ~LayoutState(); 54 55 void clearPaginationInformation(); isPaginatingColumns()56 bool isPaginatingColumns() const { return m_columnInfo; } isPaginated()57 bool isPaginated() const { return m_isPaginated; } 58 59 // The page logical offset is the object's offset from the top of the page in the page progression 60 // direction (so an x-offset in vertical text and a y-offset for horizontal text). 61 LayoutUnit pageLogicalOffset(const RenderBox&, const LayoutUnit& childLogicalOffset) const; 62 63 void addForcedColumnBreak(const RenderBox&, const LayoutUnit& childLogicalOffset); 64 setColumnInfo(ColumnInfo * columnInfo)65 void setColumnInfo(ColumnInfo* columnInfo) { m_columnInfo = columnInfo; } 66 layoutOffset()67 const LayoutSize& layoutOffset() const { return m_layoutOffset; } pageOffset()68 const LayoutSize& pageOffset() const { return m_pageOffset; } pageLogicalHeight()69 LayoutUnit pageLogicalHeight() const { return m_pageLogicalHeight; } pageLogicalHeightChanged()70 bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; } containingBlockLogicalWidthChanged()71 bool containingBlockLogicalWidthChanged() const { return m_containingBlockLogicalWidthChanged; } 72 next()73 LayoutState* next() const { return m_next; } 74 needsBlockDirectionLocationSetBeforeLayout()75 bool needsBlockDirectionLocationSetBeforeLayout() const { return m_isPaginated && m_pageLogicalHeight; } 76 columnInfo()77 ColumnInfo* columnInfo() const { return m_columnInfo; } 78 renderer()79 RenderObject& renderer() const { return m_renderer; } 80 81 private: 82 friend class ForceHorriblySlowRectMapping; 83 84 // Do not add anything apart from bitfields until after m_columnInfo. See https://bugs.webkit.org/show_bug.cgi?id=100173 85 bool m_isPaginated : 1; 86 // If our page height has changed, this will force all blocks to relayout. 87 bool m_pageLogicalHeightChanged : 1; 88 bool m_containingBlockLogicalWidthChanged : 1; 89 90 // If the enclosing pagination model is a column model, then this will store column information for easy retrieval/manipulation. 91 ColumnInfo* m_columnInfo; 92 LayoutState* m_next; 93 94 // x/y offset from container. Does not include relative positioning or scroll offsets. 95 LayoutSize m_layoutOffset; 96 97 // The current page height for the pagination model that encloses us. 98 LayoutUnit m_pageLogicalHeight; 99 // The offset of the start of the first page in the nearest enclosing pagination model. 100 LayoutSize m_pageOffset; 101 102 RenderObject& m_renderer; 103 }; 104 105 } // namespace blink 106 107 #endif // LayoutState_h 108