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 "core/rendering/RenderObject.h" 27 #include "wtf/Forward.h" 28 #include "wtf/PassRefPtr.h" 29 30 namespace WebCore { 31 32 class AbstractInlineTextBox; 33 class InlineTextBox; 34 35 class RenderText : public RenderObject { 36 public: 37 // FIXME: If the node argument is not a Text node or the string argument is 38 // not the content of the Text node, updating text-transform property 39 // doesn't re-transform the string. 40 RenderText(Node*, PassRefPtr<StringImpl>); 41 #ifndef NDEBUG 42 virtual ~RenderText(); 43 #endif 44 45 virtual const char* renderName() const; 46 47 virtual bool isTextFragment() const; 48 virtual bool isWordBreak() const; 49 50 virtual PassRefPtr<StringImpl> originalText() const; 51 52 void extractTextBox(InlineTextBox*); 53 void attachTextBox(InlineTextBox*); 54 void removeTextBox(InlineTextBox*); 55 56 const String& text() const { return m_text; } 57 virtual unsigned textStartOffset() const { return 0; } 58 String plainText() const; 59 60 InlineTextBox* createInlineTextBox(); 61 void dirtyLineBoxes(bool fullLayout); 62 63 virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const OVERRIDE FINAL; 64 void absoluteRectsForRange(Vector<IntRect>&, unsigned startOffset = 0, unsigned endOffset = INT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0); 65 66 virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const OVERRIDE FINAL; 67 void absoluteQuadsForRange(Vector<FloatQuad>&, unsigned startOffset = 0, unsigned endOffset = INT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0); 68 69 enum ClippingOption { NoClipping, ClipToEllipsis }; 70 void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed = 0, ClippingOption = NoClipping) const; 71 72 virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE; 73 74 bool is8Bit() const { return m_text.is8Bit(); } 75 const LChar* characters8() const { return m_text.impl()->characters8(); } 76 const UChar* characters16() const { return m_text.impl()->characters16(); } 77 bool hasEmptyText() const { return m_text.isEmpty(); } 78 String substring(unsigned position, unsigned length) const { return m_text.substring(position, length); } 79 UChar characterAt(unsigned) const; 80 UChar uncheckedCharacterAt(unsigned) const; 81 UChar operator[](unsigned i) const { return uncheckedCharacterAt(i); } 82 unsigned textLength() const { return m_text.length(); } // non virtual implementation of length() 83 void positionLineBox(InlineBox*); 84 85 virtual float width(unsigned from, unsigned len, const Font&, float xPos, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 86 virtual float width(unsigned from, unsigned len, float xPos, bool firstLine = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 87 88 float minLogicalWidth() const; 89 float maxLogicalWidth() const; 90 91 void trimmedPrefWidths(float leadWidth, 92 float& firstLineMinWidth, bool& hasBreakableStart, 93 float& lastLineMinWidth, bool& hasBreakableEnd, 94 bool& hasBreakableChar, bool& hasBreak, 95 float& firstLineMaxWidth, float& lastLineMaxWidth, 96 float& minWidth, float& maxWidth, bool& stripFrontSpaces); 97 98 virtual IntRect linesBoundingBox() const; 99 LayoutRect linesVisualOverflowBoundingBox() const; 100 101 FloatPoint firstRunOrigin() const; 102 float firstRunX() const; 103 float firstRunY() const; 104 105 virtual void setText(PassRefPtr<StringImpl>, bool force = false); 106 void setTextWithOffset(PassRefPtr<StringImpl>, unsigned offset, unsigned len, bool force = false); 107 108 virtual void transformText(); 109 110 virtual bool canBeSelectionLeaf() const { return true; } 111 virtual void setSelectionState(SelectionState s) OVERRIDE FINAL; 112 virtual LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) OVERRIDE; 113 virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0); 114 115 LayoutUnit marginLeft() const { return minimumValueForLength(style()->marginLeft(), 0, view()); } 116 LayoutUnit marginRight() const { return minimumValueForLength(style()->marginRight(), 0, view()); } 117 118 virtual LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const OVERRIDE FINAL; 119 120 InlineTextBox* firstTextBox() const { return m_firstTextBox; } 121 InlineTextBox* lastTextBox() const { return m_lastTextBox; } 122 123 virtual int caretMinOffset() const; 124 virtual int caretMaxOffset() const; 125 unsigned renderedTextLength() const; 126 127 virtual int previousOffset(int current) const OVERRIDE FINAL; 128 virtual int previousOffsetForBackwardDeletion(int current) const OVERRIDE FINAL; 129 virtual int nextOffset(int current) const OVERRIDE FINAL; 130 131 bool containsReversedText() const { return m_containsReversedText; } 132 133 bool isSecure() const { return style()->textSecurity() != TSNONE; } 134 void momentarilyRevealLastTypedCharacter(unsigned lastTypedCharacterOffset); 135 136 InlineTextBox* findNextInlineTextBox(int offset, int& pos) const; 137 138 void checkConsistency() const; 139 140 bool isAllCollapsibleWhitespace() const; 141 142 bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; } 143 bool knownToHaveNoOverflowAndNoFallbackFonts() const { return m_knownToHaveNoOverflowAndNoFallbackFonts; } 144 145 void removeAndDestroyTextBoxes(); 146 147 PassRefPtr<AbstractInlineTextBox> firstAbstractInlineTextBox(); 148 149 protected: 150 virtual void computePreferredLogicalWidths(float leadWidth); 151 virtual void willBeDestroyed(); 152 153 virtual void styleWillChange(StyleDifference, const RenderStyle*) OVERRIDE FINAL { } 154 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); 155 156 virtual void setTextInternal(PassRefPtr<StringImpl>); 157 virtual UChar previousCharacter() const; 158 159 virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer* currentLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const OVERRIDE; 160 161 virtual InlineTextBox* createTextBox(); // Subclassed by SVG. 162 163 private: 164 void computePreferredLogicalWidths(float leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow&); 165 166 bool computeCanUseSimpleFontCodePath() const; 167 168 // Make length() private so that callers that have a RenderText* 169 // will use the more efficient textLength() instead, while 170 // callers with a RenderObject* can continue to use length(). 171 virtual unsigned length() const OVERRIDE FINAL { return textLength(); } 172 173 virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE FINAL { ASSERT_NOT_REACHED(); } 174 virtual void layout() OVERRIDE FINAL { ASSERT_NOT_REACHED(); } 175 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) OVERRIDE FINAL { ASSERT_NOT_REACHED(); return false; } 176 177 void deleteTextBoxes(); 178 bool containsOnlyWhitespace(unsigned from, unsigned len) const; 179 float widthFromCache(const Font&, int start, int len, float xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const; 180 bool isAllASCII() const { return m_isAllASCII; } 181 182 void secureText(UChar mask); 183 184 // We put the bitfield first to minimize padding on 64-bit. 185 bool m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines. 186 bool m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n'). 187 bool m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t'). 188 bool m_hasBreakableStart : 1; 189 bool m_hasBreakableEnd : 1; 190 bool m_hasEndWhiteSpace : 1; 191 bool m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific 192 // line boxes, and this hint will enable layoutInlineChildren to avoid 193 // just dirtying everything when character data is modified (e.g., appended/inserted 194 // or removed). 195 bool m_containsReversedText : 1; 196 bool m_isAllASCII : 1; 197 bool m_canUseSimpleFontCodePath : 1; 198 mutable bool m_knownToHaveNoOverflowAndNoFallbackFonts : 1; 199 200 float m_minWidth; 201 float m_maxWidth; 202 float m_firstLineMinWidth; 203 float m_lastLineLineMinWidth; 204 205 String m_text; 206 207 InlineTextBox* m_firstTextBox; 208 InlineTextBox* m_lastTextBox; 209 }; 210 211 inline UChar RenderText::uncheckedCharacterAt(unsigned i) const 212 { 213 ASSERT_WITH_SECURITY_IMPLICATION(i < textLength()); 214 return is8Bit() ? characters8()[i] : characters16()[i]; 215 } 216 217 inline UChar RenderText::characterAt(unsigned i) const 218 { 219 if (i >= textLength()) 220 return 0; 221 222 return uncheckedCharacterAt(i); 223 } 224 225 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderText, isText()); 226 227 #ifdef NDEBUG 228 inline void RenderText::checkConsistency() const 229 { 230 } 231 #endif 232 233 void applyTextTransform(const RenderStyle*, String&, UChar); 234 235 } // namespace WebCore 236 237 #endif // RenderText_h 238
