1/* 2 * (C) 1999 Lars Knoll (knoll@kde.org) 3 * (C) 2000 Dirk Mueller (mueller@kde.org) 4 * Copyright (C) 2004, 2005, 2006, 2007 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 RenderTextFragment_h 24#define RenderTextFragment_h 25 26#include "core/rendering/RenderText.h" 27 28namespace WebCore { 29 30// Used to represent a text substring of an element, e.g., for text runs that are split because of 31// first letter and that must therefore have different styles (and positions in the render tree). 32// We cache offsets so that text transformations can be applied in such a way that we can recover 33// the original unaltered string from our corresponding DOM node. 34class RenderTextFragment FINAL : public RenderText { 35public: 36 RenderTextFragment(Node*, StringImpl*, int startOffset, int length); 37 RenderTextFragment(Node*, StringImpl*); 38 virtual ~RenderTextFragment(); 39 40 virtual bool isTextFragment() const { return true; } 41 42 virtual bool canBeSelectionLeaf() const OVERRIDE { return node() && node()->rendererIsEditable(); } 43 44 unsigned start() const { return m_start; } 45 unsigned end() const { return m_end; } 46 47 RenderObject* firstLetter() const { return m_firstLetter; } 48 void setFirstLetter(RenderObject* firstLetter) { m_firstLetter = firstLetter; } 49 50 StringImpl* contentString() const { return m_contentString.get(); } 51 virtual PassRefPtr<StringImpl> originalText() const; 52 53 virtual void setText(PassRefPtr<StringImpl>, bool force = false) OVERRIDE; 54 55 virtual void transformText() OVERRIDE; 56 57protected: 58 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); 59 60private: 61 virtual void willBeDestroyed(); 62 63 virtual UChar previousCharacter() const; 64 RenderBlock* blockForAccompanyingFirstLetter() const; 65 66 unsigned m_start; 67 unsigned m_end; 68 RefPtr<StringImpl> m_contentString; 69 RenderObject* m_firstLetter; 70}; 71 72inline RenderTextFragment* toRenderTextFragment(RenderObject* object) 73{ 74 ASSERT_WITH_SECURITY_IMPLICATION(!object || toRenderText(object)->isTextFragment()); 75 return static_cast<RenderTextFragment*>(object); 76} 77 78inline const RenderTextFragment* toRenderTextFragment(const RenderObject* object) 79{ 80 ASSERT_WITH_SECURITY_IMPLICATION(!object || toRenderText(object)->isTextFragment()); 81 return static_cast<const RenderTextFragment*>(object); 82} 83 84// This will catch anyone doing an unnecessary cast. 85void toRenderTextFragment(const RenderTextFragment*); 86 87} // namespace WebCore 88 89#endif // RenderTextFragment_h 90