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 virtual ~RenderTextFragment();
39
isTextFragment()40 virtual bool isTextFragment() const { return true; }
41
42 virtual void destroy();
43
start()44 unsigned start() const { return m_start; }
end()45 unsigned end() const { return m_end; }
46
firstLetter()47 RenderObject* firstLetter() const { return m_firstLetter; }
setFirstLetter(RenderObject * firstLetter)48 void setFirstLetter(RenderObject* firstLetter) { m_firstLetter = firstLetter; }
49
contentString()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
toRenderTextFragment(RenderObject * object)67 inline RenderTextFragment* toRenderTextFragment(RenderObject* object)
68 {
69 ASSERT(!object || toRenderText(object)->isTextFragment());
70 return static_cast<RenderTextFragment*>(object);
71 }
72
toRenderTextFragment(const RenderObject * object)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