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      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 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     virtual ~RenderTextFragment();
     39 
     40     virtual bool isTextFragment() const { return true; }
     41 
     42     virtual void destroy();
     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 protected:
     54     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
     55 
     56 private:
     57     virtual void setTextInternal(PassRefPtr<StringImpl>);
     58     virtual UChar previousCharacter() const;
     59     RenderBlock* blockForAccompanyingFirstLetter() const;
     60 
     61     unsigned m_start;
     62     unsigned m_end;
     63     RefPtr<StringImpl> m_contentString;
     64     RenderObject* m_firstLetter;
     65 };
     66 
     67 inline RenderTextFragment* toRenderTextFragment(RenderObject* object)
     68 {
     69     ASSERT(!object || toRenderText(object)->isTextFragment());
     70     return static_cast<RenderTextFragment*>(object);
     71 }
     72 
     73 inline const RenderTextFragment* toRenderTextFragment(const RenderObject* object)
     74 {
     75     ASSERT(!object || toRenderText(object)->isTextFragment());
     76     return static_cast<const RenderTextFragment*>(object);
     77 }
     78 
     79 // This will catch anyone doing an unnecessary cast.
     80 void toRenderTextFragment(const RenderTextFragment*);
     81 
     82 } // namespace WebCore
     83 
     84 #endif // RenderTextFragment_h
     85