WebCore/RenderTextFragment.h

   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 "RenderText.h"
  27
  28 namespace 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.
  34 class RenderTextFragment : public RenderText {
  35 public:
  36     RenderTextFragment(Node*, StringImpl*, int startOffset, int length);
  37     RenderTextFragment(Node*, StringImpl*);
  38
  39     virtual bool isTextFragment() const { return true; }
  40
  41     virtual void destroy();
  42
  43     unsigned start() const { return m_start; }
  44     unsigned end() const { return m_end; }
  45
  46     RenderObject* firstLetter() const { return m_firstLetter; }
  47     void setFirstLetter(RenderObject* firstLetter) { m_firstLetter = firstLetter; }
  48
  49     StringImpl* contentString() const { return m_contentString.get(); }
  50     virtual PassRefPtr<StringImpl> originalText() const;
  51
  52 private:
  53     virtual void setTextInternal(PassRefPtr<StringImpl>);
  54     virtual UChar previousCharacter();
  55
  56     unsigned m_start;
  57     unsigned m_end;
  58     RefPtr<StringImpl> m_contentString;
  59     RenderObject* m_firstLetter;
  60 };
  61
  62 } // namespace WebCore
  63
  64 #endif // RenderTextFragment_h