WebCore/rendering/RenderTextFragment.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 04 Oct 2010 01:32:07 +0300
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/*
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 * (C) 1999 Lars Knoll (knoll@kde.org)
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 * (C) 2000 Dirk Mueller (mueller@kde.org)
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 * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Library General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Library General Public License for more details.
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 *
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 * You should have received a copy of the GNU Library General Public License
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 * along with this library; see the file COPYING.LIB.  If not, write to
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 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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 * Boston, MA 02110-1301, USA.
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 *
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 */
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#ifndef RenderTextFragment_h
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#define RenderTextFragment_h
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#include "RenderText.h"
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namespace WebCore {
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// Used to represent a text substring of an element, e.g., for text runs that are split because of
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// first letter and that must therefore have different styles (and positions in the render tree).
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// We cache offsets so that text transformations can be applied in such a way that we can recover
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// the original unaltered string from our corresponding DOM node.
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class RenderTextFragment : public RenderText {
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public:
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    RenderTextFragment(Node*, StringImpl*, int startOffset, int length);
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    RenderTextFragment(Node*, StringImpl*);
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    virtual bool isTextFragment() const { return true; }
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    virtual void destroy();
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    unsigned start() const { return m_start; }
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    unsigned end() const { return m_end; }
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    RenderObject* firstLetter() const { return m_firstLetter; }
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    void setFirstLetter(RenderObject* firstLetter) { m_firstLetter = firstLetter; }
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    StringImpl* contentString() const { return m_contentString.get(); }
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    virtual PassRefPtr<StringImpl> originalText() const;
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private:
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    virtual void setTextInternal(PassRefPtr<StringImpl>);
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    virtual UChar previousCharacter() const;
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    unsigned m_start;
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    unsigned m_end;
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    RefPtr<StringImpl> m_contentString;
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    RenderObject* m_firstLetter;
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};
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} // namespace WebCore
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#endif // RenderTextFragment_h