1 /* 2 * (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 2000 Dirk Mueller (mueller (at) kde.org) 4 * Copyright (C) 2004, 2005, 2006, 2009, 2010, 2011 Apple Inc. All rights reserved. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public License 17 * along with this library; see the file COPYING.LIB. If not, write to 18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA. 20 * 21 */ 22 23 #ifndef InlineTextBox_h 24 #define InlineTextBox_h 25 26 #include "core/rendering/InlineBox.h" 27 #include "core/rendering/RenderText.h" // so textRenderer() can be inline 28 #include "platform/fonts/TextBlob.h" 29 #include "platform/text/TextRun.h" 30 #include "wtf/Forward.h" 31 32 namespace blink { 33 34 struct CompositionUnderline; 35 class DocumentMarker; 36 class GraphicsContext; 37 38 const unsigned short cNoTruncation = USHRT_MAX; 39 const unsigned short cFullTruncation = USHRT_MAX - 1; 40 41 class InlineTextBox : public InlineBox { 42 public: 43 InlineTextBox(RenderObject& obj) 44 : InlineBox(obj) 45 , m_prevTextBox(0) 46 , m_nextTextBox(0) 47 , m_start(0) 48 , m_len(0) 49 , m_truncation(cNoTruncation) 50 { 51 } 52 53 RenderText& renderer() const { return toRenderText(InlineBox::renderer()); } 54 55 virtual void destroy() OVERRIDE FINAL; 56 57 InlineTextBox* prevTextBox() const { return m_prevTextBox; } 58 InlineTextBox* nextTextBox() const { return m_nextTextBox; } 59 void setNextTextBox(InlineTextBox* n) { m_nextTextBox = n; } 60 void setPreviousTextBox(InlineTextBox* p) { m_prevTextBox = p; } 61 62 // FIXME: These accessors should ASSERT(!isDirty()). See https://bugs.webkit.org/show_bug.cgi?id=97264 63 unsigned start() const { return m_start; } 64 unsigned end() const { return m_len ? m_start + m_len - 1 : m_start; } 65 unsigned len() const { return m_len; } 66 67 void setStart(unsigned start) { m_start = start; } 68 void setLen(unsigned len) { m_len = len; } 69 70 void offsetRun(int d) { ASSERT(!isDirty()); m_start += d; } 71 72 unsigned short truncation() { return m_truncation; } 73 74 virtual void markDirty() OVERRIDE FINAL; 75 76 using InlineBox::hasHyphen; 77 using InlineBox::setHasHyphen; 78 using InlineBox::canHaveLeadingExpansion; 79 using InlineBox::setCanHaveLeadingExpansion; 80 81 static inline bool compareByStart(const InlineTextBox* first, const InlineTextBox* second) { return first->start() < second->start(); } 82 83 virtual int baselinePosition(FontBaseline) const OVERRIDE FINAL; 84 virtual LayoutUnit lineHeight() const OVERRIDE FINAL; 85 86 bool getEmphasisMarkPosition(RenderStyle*, TextEmphasisPosition&) const; 87 88 LayoutRect logicalOverflowRect() const; 89 void setLogicalOverflowRect(const LayoutRect&); 90 LayoutUnit logicalTopVisualOverflow() const { return logicalOverflowRect().y(); } 91 LayoutUnit logicalBottomVisualOverflow() const { return logicalOverflowRect().maxY(); } 92 93 #ifndef NDEBUG 94 virtual void showBox(int = 0) const OVERRIDE; 95 virtual const char* boxName() const OVERRIDE; 96 #endif 97 98 enum RotationDirection { Counterclockwise, Clockwise }; 99 static AffineTransform rotation(const FloatRect& boxRect, RotationDirection); 100 private: 101 LayoutUnit selectionTop(); 102 LayoutUnit selectionBottom(); 103 LayoutUnit selectionHeight(); 104 105 // charactersWithHyphen, if provided, must not be destroyed before the TextRun. 106 TextRun constructTextRun(RenderStyle*, const Font&, StringBuilder* charactersWithHyphen = 0) const; 107 TextRun constructTextRun(RenderStyle*, const Font&, StringView, int maximumLength, StringBuilder* charactersWithHyphen = 0) const; 108 109 public: 110 TextRun constructTextRunForInspector(RenderStyle*, const Font&) const; 111 virtual FloatRect calculateBoundaries() const OVERRIDE { return FloatRect(x(), y(), width(), height()); } 112 113 virtual LayoutRect localSelectionRect(int startPos, int endPos); 114 bool isSelected(int startPos, int endPos) const; 115 void selectionStartEnd(int& sPos, int& ePos) const; 116 117 protected: 118 virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE; 119 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE; 120 121 private: 122 virtual void deleteLine() OVERRIDE FINAL; 123 virtual void extractLine() OVERRIDE FINAL; 124 virtual void attachLine() OVERRIDE FINAL; 125 126 public: 127 virtual RenderObject::SelectionState selectionState() const OVERRIDE FINAL; 128 129 private: 130 virtual void clearTruncation() OVERRIDE FINAL { m_truncation = cNoTruncation; } 131 virtual float placeEllipsisBox(bool flowIsLTR, float visibleLeftEdge, float visibleRightEdge, float ellipsisWidth, float &truncatedWidth, bool& foundBox) OVERRIDE FINAL; 132 133 public: 134 virtual bool isLineBreak() const OVERRIDE FINAL; 135 136 void setExpansion(int newExpansion) 137 { 138 m_logicalWidth -= expansion(); 139 InlineBox::setExpansion(newExpansion); 140 m_logicalWidth += newExpansion; 141 } 142 143 private: 144 virtual bool isInlineTextBox() const OVERRIDE FINAL { return true; } 145 146 public: 147 virtual int caretMinOffset() const OVERRIDE FINAL; 148 virtual int caretMaxOffset() const OVERRIDE FINAL; 149 150 private: 151 float textPos() const; // returns the x position relative to the left start of the text line. 152 153 public: 154 virtual int offsetForPosition(float x, bool includePartialGlyphs = true) const; 155 virtual float positionForOffset(int offset) const; 156 157 bool containsCaretOffset(int offset) const; // false for offset after line break 158 159 // Fills a vector with the pixel width of each character. 160 void characterWidths(Vector<float>&) const; 161 162 private: 163 InlineTextBox* m_prevTextBox; // The previous box that also uses our RenderObject 164 InlineTextBox* m_nextTextBox; // The next box that also uses our RenderObject 165 166 int m_start; 167 unsigned short m_len; 168 169 unsigned short m_truncation; // Where to truncate when text overflow is applied. We use special constants to 170 // denote no truncation (the whole run paints) and full truncation (nothing paints at all). 171 172 unsigned underlinePaintStart(const CompositionUnderline&); 173 unsigned underlinePaintEnd(const CompositionUnderline&); 174 175 protected: 176 void paintSingleCompositionBackgroundRun(GraphicsContext*, const FloatPoint& boxOrigin, RenderStyle*, const Font&, Color backgroundColor, int startPos, int endPos); 177 void paintCompositionBackgrounds(GraphicsContext*, const FloatPoint& boxOrigin, RenderStyle*, const Font&, bool useCustomUnderlines); 178 void paintDocumentMarkers(GraphicsContext*, const FloatPoint& boxOrigin, RenderStyle*, const Font&, bool background); 179 void paintCompositionUnderline(GraphicsContext*, const FloatPoint& boxOrigin, const CompositionUnderline&); 180 181 // These functions both paint markers and update the DocumentMarker's renderedRect. 182 virtual void paintDocumentMarker(GraphicsContext*, const FloatPoint& boxOrigin, DocumentMarker*, RenderStyle*, const Font&, bool grammar); 183 virtual void paintTextMatchMarker(GraphicsContext*, const FloatPoint& boxOrigin, DocumentMarker*, RenderStyle*, const Font&); 184 185 private: 186 void paintDecoration(GraphicsContext*, const FloatPoint& boxOrigin, TextDecoration); 187 void paintSelection(GraphicsContext*, const FloatPoint& boxOrigin, RenderStyle*, const Font&, Color textColor); 188 189 TextRun::ExpansionBehavior expansionBehavior() const 190 { 191 return (canHaveLeadingExpansion() ? TextRun::AllowLeadingExpansion : TextRun::ForbidLeadingExpansion) 192 | (expansion() && nextLeafChild() ? TextRun::AllowTrailingExpansion : TextRun::ForbidTrailingExpansion); 193 } 194 }; 195 196 DEFINE_INLINE_BOX_TYPE_CASTS(InlineTextBox); 197 198 void alignSelectionRectToDevicePixels(FloatRect&); 199 200 inline AffineTransform InlineTextBox::rotation(const FloatRect& boxRect, RotationDirection rotationDirection) 201 { 202 return rotationDirection == Clockwise ? AffineTransform(0, 1, -1, 0, boxRect.x() + boxRect.maxY(), boxRect.maxY() - boxRect.x()) 203 : AffineTransform(0, -1, 1, 0, boxRect.x() - boxRect.maxY(), boxRect.x() + boxRect.maxY()); 204 } 205 206 } // namespace blink 207 208 #endif // InlineTextBox_h 209
