1 /* 2 * (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 2000 Dirk Mueller (mueller (at) kde.org) 4 * Copyright (C) 2004-2009, 2013 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/dom/Text.h" 27 #include "core/rendering/RenderObject.h" 28 #include "platform/LengthFunctions.h" 29 #include "platform/text/TextPath.h" 30 #include "wtf/Forward.h" 31 #include "wtf/PassRefPtr.h" 32 33 namespace blink { 34 35 class AbstractInlineTextBox; 36 class InlineTextBox; 37 38 class RenderText : public RenderObject { 39 public: 40 // FIXME: If the node argument is not a Text node or the string argument is 41 // not the content of the Text node, updating text-transform property 42 // doesn't re-transform the string. 43 RenderText(Node*, PassRefPtr<StringImpl>); 44 #if ENABLE(ASSERT) 45 virtual ~RenderText(); 46 #endif 47 48 virtual const char* renderName() const OVERRIDE; 49 50 virtual bool isTextFragment() const; 51 virtual bool isWordBreak() const; 52 53 virtual PassRefPtr<StringImpl> originalText() const; 54 55 void extractTextBox(InlineTextBox*); 56 void attachTextBox(InlineTextBox*); 57 void removeTextBox(InlineTextBox*); 58 59 const String& text() const { return m_text; } 60 virtual unsigned textStartOffset() const { return 0; } 61 String plainText() const; 62 63 InlineTextBox* createInlineTextBox(); 64 void dirtyLineBoxes(bool fullLayout); 65 66 virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const OVERRIDE FINAL; 67 void absoluteRectsForRange(Vector<IntRect>&, unsigned startOffset = 0, unsigned endOffset = INT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0); 68 69 virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const OVERRIDE FINAL; 70 void absoluteQuadsForRange(Vector<FloatQuad>&, unsigned startOffset = 0, unsigned endOffset = INT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0); 71 72 enum ClippingOption { NoClipping, ClipToEllipsis }; 73 void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed = 0, ClippingOption = NoClipping) const; 74 75 virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE; 76 77 bool is8Bit() const { return m_text.is8Bit(); } 78 const LChar* characters8() const { return m_text.impl()->characters8(); } 79 const UChar* characters16() const { return m_text.impl()->characters16(); } 80 bool hasEmptyText() const { return m_text.isEmpty(); } 81 String substring(unsigned position, unsigned length) const { return m_text.substring(position, length); } 82 UChar characterAt(unsigned) const; 83 UChar uncheckedCharacterAt(unsigned) const; 84 UChar operator[](unsigned i) const { return uncheckedCharacterAt(i); } 85 unsigned textLength() const { return m_text.length(); } // non virtual implementation of length() 86 void positionLineBox(InlineBox*); 87 88 virtual float width(unsigned from, unsigned len, const Font&, float xPos, TextDirection, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 89 virtual float width(unsigned from, unsigned len, float xPos, TextDirection, bool firstLine = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 90 91 float minLogicalWidth() const; 92 float maxLogicalWidth() const; 93 94 void trimmedPrefWidths(float leadWidth, 95 float& firstLineMinWidth, bool& hasBreakableStart, 96 float& lastLineMinWidth, bool& hasBreakableEnd, 97 bool& hasBreakableChar, bool& hasBreak, 98 float& firstLineMaxWidth, float& lastLineMaxWidth, 99 float& minWidth, float& maxWidth, bool& stripFrontSpaces, 100 TextDirection); 101 102 virtual IntRect linesBoundingBox() const; 103 LayoutRect linesVisualOverflowBoundingBox() const; 104 105 FloatPoint firstRunOrigin() const; 106 float firstRunX() const; 107 float firstRunY() const; 108 109 virtual void setText(PassRefPtr<StringImpl>, bool force = false); 110 void setTextWithOffset(PassRefPtr<StringImpl>, unsigned offset, unsigned len, bool force = false); 111 112 virtual void transformText(); 113 114 virtual bool canBeSelectionLeaf() const OVERRIDE { return true; } 115 virtual void setSelectionState(SelectionState s) OVERRIDE FINAL; 116 virtual LayoutRect selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer) const OVERRIDE; 117 virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) OVERRIDE; 118 119 LayoutUnit marginLeft() const { return minimumValueForLength(style()->marginLeft(), 0); } 120 LayoutUnit marginRight() const { return minimumValueForLength(style()->marginRight(), 0); } 121 122 InlineTextBox* firstTextBox() const { return m_firstTextBox; } 123 InlineTextBox* lastTextBox() const { return m_lastTextBox; } 124 125 virtual int caretMinOffset() const OVERRIDE; 126 virtual int caretMaxOffset() const OVERRIDE; 127 unsigned renderedTextLength() const; 128 129 virtual int previousOffset(int current) const OVERRIDE FINAL; 130 virtual int previousOffsetForBackwardDeletion(int current) const OVERRIDE FINAL; 131 virtual int nextOffset(int current) const OVERRIDE FINAL; 132 133 bool containsReversedText() const { return m_containsReversedText; } 134 135 bool isSecure() const { return style()->textSecurity() != TSNONE; } 136 void momentarilyRevealLastTypedCharacter(unsigned lastTypedCharacterOffset); 137 138 void checkConsistency() const; 139 140 bool isAllCollapsibleWhitespace() const; 141 142 bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; } 143 144 void removeAndDestroyTextBoxes(); 145 146 PassRefPtr<AbstractInlineTextBox> firstAbstractInlineTextBox(); 147 148 protected: 149 virtual void willBeDestroyed() OVERRIDE; 150 151 virtual void styleWillChange(StyleDifference, const RenderStyle&) OVERRIDE FINAL { } 152 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE; 153 154 virtual void setTextInternal(PassRefPtr<StringImpl>); 155 virtual UChar previousCharacter() const; 156 157 virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer* currentLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const OVERRIDE; 158 159 virtual InlineTextBox* createTextBox(); // Subclassed by SVG. 160 161 private: 162 void computePreferredLogicalWidths(float leadWidth); 163 void computePreferredLogicalWidths(float leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow&); 164 165 bool computeCanUseSimpleFontCodePath() const; 166 167 // Make length() private so that callers that have a RenderText* 168 // will use the more efficient textLength() instead, while 169 // callers with a RenderObject* can continue to use length(). 170 virtual unsigned length() const OVERRIDE FINAL { return textLength(); } 171 172 virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE FINAL { ASSERT_NOT_REACHED(); } 173 virtual void layout() OVERRIDE FINAL { ASSERT_NOT_REACHED(); } 174 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) OVERRIDE FINAL { ASSERT_NOT_REACHED(); return false; } 175 176 void deleteTextBoxes(); 177 bool containsOnlyWhitespace(unsigned from, unsigned len) const; 178 float widthFromCache(const Font&, int start, int len, float xPos, TextDirection, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const; 179 bool isAllASCII() const { return m_isAllASCII; } 180 181 void secureText(UChar mask); 182 183 bool isText() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check. 184 185 virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const OVERRIDE FINAL; 186 // The parent invalidates for RenderText, so RenderText does nothing. 187 virtual InvalidationReason invalidatePaintIfNeeded(const PaintInvalidationState&, const RenderLayerModelObject&) OVERRIDE FINAL { return InvalidationNone; } 188 189 // We put the bitfield first to minimize padding on 64-bit. 190 bool m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines. 191 bool m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n'). 192 bool m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t'). 193 bool m_hasBreakableStart : 1; 194 bool m_hasBreakableEnd : 1; 195 bool m_hasEndWhiteSpace : 1; 196 bool m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific 197 // line boxes, and this hint will enable layoutInlineChildren to avoid 198 // just dirtying everything when character data is modified (e.g., appended/inserted 199 // or removed). 200 bool m_containsReversedText : 1; 201 bool m_isAllASCII : 1; 202 bool m_canUseSimpleFontCodePath : 1; 203 mutable bool m_knownToHaveNoOverflowAndNoFallbackFonts : 1; 204 205 float m_minWidth; 206 float m_maxWidth; 207 float m_firstLineMinWidth; 208 float m_lastLineLineMinWidth; 209 210 String m_text; 211 212 InlineTextBox* m_firstTextBox; 213 InlineTextBox* m_lastTextBox; 214 }; 215 216 inline UChar RenderText::uncheckedCharacterAt(unsigned i) const 217 { 218 ASSERT_WITH_SECURITY_IMPLICATION(i < textLength()); 219 return is8Bit() ? characters8()[i] : characters16()[i]; 220 } 221 222 inline UChar RenderText::characterAt(unsigned i) const 223 { 224 if (i >= textLength()) 225 return 0; 226 227 return uncheckedCharacterAt(i); 228 } 229 230 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderText, isText()); 231 232 #if !ENABLE(ASSERT) 233 inline void RenderText::checkConsistency() const 234 { 235 } 236 #endif 237 238 inline RenderText* Text::renderer() const 239 { 240 return toRenderText(CharacterData::renderer()); 241 } 242 243 void applyTextTransform(const RenderStyle*, String&, UChar); 244 245 } // namespace blink 246 247 #endif // RenderText_h 248
