1 /* 2 * Copyright (C) 2011 Google 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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef RenderedPosition_h 32 #define RenderedPosition_h 33 34 #include "core/editing/TextAffinity.h" 35 #include "core/rendering/InlineBox.h" 36 37 namespace blink { 38 39 class GraphicsLayer; 40 class LayoutUnit; 41 class Position; 42 class RenderObject; 43 class VisiblePosition; 44 struct CompositedSelectionBound; 45 46 class RenderedPosition { 47 public: 48 RenderedPosition(); 49 explicit RenderedPosition(const VisiblePosition&); 50 explicit RenderedPosition(const Position&, EAffinity); 51 bool isEquivalent(const RenderedPosition&) const; 52 53 bool isNull() const { return !m_renderer; } 54 RootInlineBox* rootBox() { return m_inlineBox ? &m_inlineBox->root() : 0; } 55 56 unsigned char bidiLevelOnLeft() const; 57 unsigned char bidiLevelOnRight() const; 58 RenderedPosition leftBoundaryOfBidiRun(unsigned char bidiLevelOfRun); 59 RenderedPosition rightBoundaryOfBidiRun(unsigned char bidiLevelOfRun); 60 61 enum ShouldMatchBidiLevel { MatchBidiLevel, IgnoreBidiLevel }; 62 bool atLeftBoundaryOfBidiRun() const { return atLeftBoundaryOfBidiRun(IgnoreBidiLevel, 0); } 63 bool atRightBoundaryOfBidiRun() const { return atRightBoundaryOfBidiRun(IgnoreBidiLevel, 0); } 64 // The following two functions return true only if the current position is at the end of the bidi run 65 // of the specified bidi embedding level. 66 bool atLeftBoundaryOfBidiRun(unsigned char bidiLevelOfRun) const { return atLeftBoundaryOfBidiRun(MatchBidiLevel, bidiLevelOfRun); } 67 bool atRightBoundaryOfBidiRun(unsigned char bidiLevelOfRun) const { return atRightBoundaryOfBidiRun(MatchBidiLevel, bidiLevelOfRun); } 68 69 Position positionAtLeftBoundaryOfBiDiRun() const; 70 Position positionAtRightBoundaryOfBiDiRun() const; 71 72 IntRect absoluteRect(LayoutUnit* extraWidthToEndOfLine = 0) const; 73 void positionInGraphicsLayerBacking(CompositedSelectionBound&) const; 74 75 private: 76 bool operator==(const RenderedPosition&) const { return false; } 77 explicit RenderedPosition(RenderObject*, InlineBox*, int offset); 78 79 InlineBox* prevLeafChild() const; 80 InlineBox* nextLeafChild() const; 81 bool atLeftmostOffsetInBox() const { return m_inlineBox && m_offset == m_inlineBox->caretLeftmostOffset(); } 82 bool atRightmostOffsetInBox() const { return m_inlineBox && m_offset == m_inlineBox->caretRightmostOffset(); } 83 bool atLeftBoundaryOfBidiRun(ShouldMatchBidiLevel, unsigned char bidiLevelOfRun) const; 84 bool atRightBoundaryOfBidiRun(ShouldMatchBidiLevel, unsigned char bidiLevelOfRun) const; 85 86 RenderObject* m_renderer; 87 InlineBox* m_inlineBox; 88 int m_offset; 89 90 static InlineBox* uncachedInlineBox() { return reinterpret_cast<InlineBox*>(1); } 91 // Needs to be different form 0 so pick 1 because it's also on the null page. 92 93 mutable InlineBox* m_prevLeafChild; 94 mutable InlineBox* m_nextLeafChild; 95 }; 96 97 inline RenderedPosition::RenderedPosition() 98 : m_renderer(0) 99 , m_inlineBox(0) 100 , m_offset(0) 101 , m_prevLeafChild(uncachedInlineBox()) 102 , m_nextLeafChild(uncachedInlineBox()) 103 { 104 } 105 106 inline RenderedPosition::RenderedPosition(RenderObject* renderer, InlineBox* box, int offset) 107 : m_renderer(renderer) 108 , m_inlineBox(box) 109 , m_offset(offset) 110 , m_prevLeafChild(uncachedInlineBox()) 111 , m_nextLeafChild(uncachedInlineBox()) 112 { 113 } 114 115 bool renderObjectContainsPosition(RenderObject*, const Position&); 116 117 }; 118 119 #endif // RenderedPosition_h 120