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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 "core/rendering/RenderText.h"
     27 
     28 namespace blink {
     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 FINAL : public RenderText {
     35 public:
     36     RenderTextFragment(Node*, StringImpl*, int startOffset, int length);
     37     RenderTextFragment(Node*, StringImpl*);
     38     virtual ~RenderTextFragment();
     39     virtual void trace(Visitor*) OVERRIDE;
     40 
     41     virtual bool isTextFragment() const OVERRIDE { return true; }
     42 
     43     virtual bool canBeSelectionLeaf() const OVERRIDE { return node() && node()->hasEditableStyle(); }
     44 
     45     unsigned start() const { return m_start; }
     46     unsigned end() const { return m_end; }
     47     virtual unsigned textStartOffset() const OVERRIDE { return start(); }
     48 
     49     RenderBoxModelObject* firstLetter() const { return m_firstLetter; }
     50     void setFirstLetter(RenderBoxModelObject* firstLetter) { m_firstLetter = firstLetter; }
     51     RenderText* firstRenderTextInFirstLetter() const;
     52 
     53     StringImpl* contentString() const { return m_contentString.get(); }
     54     virtual PassRefPtr<StringImpl> originalText() const OVERRIDE;
     55 
     56     virtual void setText(PassRefPtr<StringImpl>, bool force = false) OVERRIDE;
     57 
     58     virtual void transformText() OVERRIDE;
     59 
     60     virtual const char* renderName() const OVERRIDE FINAL { return "RenderTextFragment"; }
     61 
     62 protected:
     63     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
     64 
     65 private:
     66     virtual void willBeDestroyed() OVERRIDE;
     67 
     68     virtual UChar previousCharacter() const OVERRIDE;
     69     RenderBlock* blockForAccompanyingFirstLetter() const;
     70     virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&) OVERRIDE;
     71 
     72     unsigned m_start;
     73     unsigned m_end;
     74     RefPtr<StringImpl> m_contentString;
     75     RawPtrWillBeMember<RenderBoxModelObject> m_firstLetter;
     76 };
     77 
     78 DEFINE_TYPE_CASTS(RenderTextFragment, RenderObject, object, toRenderText(object)->isTextFragment(), toRenderText(object).isTextFragment());
     79 
     80 } // namespace blink
     81 
     82 #endif // RenderTextFragment_h
     83