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, 2007, 2008, 2009 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 RenderText_h 24 #define RenderText_h 25 26 #include "RenderObject.h" 27 #include <wtf/Forward.h> 28 29 namespace WebCore { 30 31 class InlineTextBox; 32 33 class RenderText : public RenderObject { 34 public: 35 RenderText(Node*, PassRefPtr<StringImpl>); 36 #ifndef NDEBUG 37 virtual ~RenderText(); 38 #endif 39 40 virtual const char* renderName() const; 41 42 virtual bool isTextFragment() const; 43 virtual bool isWordBreak() const; 44 45 virtual PassRefPtr<StringImpl> originalText() const; 46 47 void extractTextBox(InlineTextBox*); 48 void attachTextBox(InlineTextBox*); 49 void removeTextBox(InlineTextBox*); 50 51 virtual void destroy(); 52 53 StringImpl* text() const { return m_text.impl(); } 54 String textWithoutTranscoding() const; 55 56 InlineTextBox* createInlineTextBox(); 57 void dirtyLineBoxes(bool fullLayout); 58 59 virtual void absoluteRects(Vector<IntRect>&, int tx, int ty); 60 void absoluteRectsForRange(Vector<IntRect>&, unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false); 61 62 virtual void absoluteQuads(Vector<FloatQuad>&); 63 void absoluteQuadsForRange(Vector<FloatQuad>&, unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false); 64 65 enum ClippingOption { NoClipping, ClipToEllipsis }; 66 void absoluteQuads(Vector<FloatQuad>&, ClippingOption option = NoClipping); 67 68 virtual VisiblePosition positionForPoint(const IntPoint&); 69 70 const UChar* characters() const { return m_text.characters(); } 71 unsigned textLength() const { return m_text.length(); } // non virtual implementation of length() 72 void positionLineBox(InlineBox*); 73 74 virtual float width(unsigned from, unsigned len, const Font&, float xPos, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 75 virtual float width(unsigned from, unsigned len, float xPos, bool firstLine = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 76 77 float minLogicalWidth() const; 78 float maxLogicalWidth() const; 79 80 void trimmedPrefWidths(float leadWidth, 81 float& beginMinW, bool& beginWS, 82 float& endMinW, bool& endWS, 83 bool& hasBreakableChar, bool& hasBreak, 84 float& beginMaxW, float& endMaxW, 85 float& minW, float& maxW, bool& stripFrontSpaces); 86 87 virtual IntRect linesBoundingBox() const; 88 IntRect linesVisualOverflowBoundingBox() const; 89 90 FloatPoint firstRunOrigin() const; 91 float firstRunX() const; 92 float firstRunY() const; 93 94 void setText(PassRefPtr<StringImpl>, bool force = false); 95 void setTextWithOffset(PassRefPtr<StringImpl>, unsigned offset, unsigned len, bool force = false); 96 97 virtual bool canBeSelectionLeaf() const { return true; } 98 virtual void setSelectionState(SelectionState s); 99 virtual IntRect selectionRectForRepaint(RenderBoxModelObject* repaintContainer, bool clipToVisibleContent = true); 100 virtual IntRect localCaretRect(InlineBox*, int caretOffset, int* extraWidthToEndOfLine = 0); 101 102 virtual int marginLeft() const { return style()->marginLeft().calcMinValue(0); } 103 virtual int marginRight() const { return style()->marginRight().calcMinValue(0); } 104 105 virtual IntRect clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer); 106 107 InlineTextBox* firstTextBox() const { return m_firstTextBox; } 108 InlineTextBox* lastTextBox() const { return m_lastTextBox; } 109 110 virtual int caretMinOffset() const; 111 virtual int caretMaxOffset() const; 112 virtual unsigned caretMaxRenderedOffset() const; 113 114 virtual int previousOffset(int current) const; 115 virtual int previousOffsetForBackwardDeletion(int current) const; 116 virtual int nextOffset(int current) const; 117 118 bool containsReversedText() const { return m_containsReversedText; } 119 120 bool isSecure() const { return style()->textSecurity() != TSNONE; } 121 void momentarilyRevealLastTypedCharacter(unsigned lastTypedCharacterOffset); 122 123 InlineTextBox* findNextInlineTextBox(int offset, int& pos) const; 124 125 bool allowTabs() const { return !style()->collapseWhiteSpace(); } 126 127 void checkConsistency() const; 128 129 virtual void computePreferredLogicalWidths(float leadWidth); 130 bool isAllCollapsibleWhitespace(); 131 132 bool knownToHaveNoOverflowAndNoFallbackFonts() const { return m_knownToHaveNoOverflowAndNoFallbackFonts; } 133 134 void removeAndDestroyTextBoxes(); 135 136 protected: 137 virtual void styleWillChange(StyleDifference, const RenderStyle*) { } 138 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); 139 140 virtual void setTextInternal(PassRefPtr<StringImpl>); 141 virtual UChar previousCharacter() const; 142 143 virtual InlineTextBox* createTextBox(); // Subclassed by SVG. 144 145 private: 146 void computePreferredLogicalWidths(float leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow&); 147 148 // Make length() private so that callers that have a RenderText* 149 // will use the more efficient textLength() instead, while 150 // callers with a RenderObject* can continue to use length(). 151 virtual unsigned length() const { return textLength(); } 152 153 virtual void paint(PaintInfo&, int, int) { ASSERT_NOT_REACHED(); } 154 virtual void layout() { ASSERT_NOT_REACHED(); } 155 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int, int, int, int, HitTestAction) { ASSERT_NOT_REACHED(); return false; } 156 157 void deleteTextBoxes(); 158 bool containsOnlyWhitespace(unsigned from, unsigned len) const; 159 float widthFromCache(const Font&, int start, int len, float xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const; 160 bool isAllASCII() const { return m_isAllASCII; } 161 void updateNeedsTranscoding(); 162 163 inline void transformText(String&) const; 164 void secureText(UChar mask); 165 166 float m_minWidth; // here to minimize padding in 64-bit. 167 168 String m_text; 169 170 InlineTextBox* m_firstTextBox; 171 InlineTextBox* m_lastTextBox; 172 173 float m_maxWidth; 174 float m_beginMinWidth; 175 float m_endMinWidth; 176 177 bool m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines. 178 bool m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n'). 179 bool m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t'). 180 bool m_hasBeginWS : 1; // Whether or not we begin with WS (only true if we aren't pre) 181 bool m_hasEndWS : 1; // Whether or not we end with WS (only true if we aren't pre) 182 bool m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific 183 // line boxes, and this hint will enable layoutInlineChildren to avoid 184 // just dirtying everything when character data is modified (e.g., appended/inserted 185 // or removed). 186 bool m_containsReversedText : 1; 187 bool m_isAllASCII : 1; 188 mutable bool m_knownToHaveNoOverflowAndNoFallbackFonts : 1; 189 bool m_needsTranscoding : 1; 190 }; 191 192 inline RenderText* toRenderText(RenderObject* object) 193 { 194 ASSERT(!object || object->isText()); 195 return static_cast<RenderText*>(object); 196 } 197 198 inline const RenderText* toRenderText(const RenderObject* object) 199 { 200 ASSERT(!object || object->isText()); 201 return static_cast<const RenderText*>(object); 202 } 203 204 // This will catch anyone doing an unnecessary cast. 205 void toRenderText(const RenderText*); 206 207 #ifdef NDEBUG 208 inline void RenderText::checkConsistency() const 209 { 210 } 211 #endif 212 213 } // namespace WebCore 214 215 #endif // RenderText_h 216