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 "core/rendering/RenderText.h"
27
28namespace 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.
34class RenderTextFragment FINAL : public RenderText {
35public:
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 bool canBeSelectionLeaf() const OVERRIDE { return node() && node()->rendererIsEditable(); }
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    virtual void setText(PassRefPtr<StringImpl>, bool force = false) OVERRIDE;
54
55    virtual void transformText() OVERRIDE;
56
57protected:
58    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
59
60private:
61    virtual void willBeDestroyed();
62
63    virtual UChar previousCharacter() const;
64    RenderBlock* blockForAccompanyingFirstLetter() const;
65
66    unsigned m_start;
67    unsigned m_end;
68    RefPtr<StringImpl> m_contentString;
69    RenderObject* m_firstLetter;
70};
71
72inline RenderTextFragment* toRenderTextFragment(RenderObject* object)
73{
74    ASSERT_WITH_SECURITY_IMPLICATION(!object || toRenderText(object)->isTextFragment());
75    return static_cast<RenderTextFragment*>(object);
76}
77
78inline const RenderTextFragment* toRenderTextFragment(const RenderObject* object)
79{
80    ASSERT_WITH_SECURITY_IMPLICATION(!object || toRenderText(object)->isTextFragment());
81    return static_cast<const RenderTextFragment*>(object);
82}
83
84// This will catch anyone doing an unnecessary cast.
85void toRenderTextFragment(const RenderTextFragment*);
86
87} // namespace WebCore
88
89#endif // RenderTextFragment_h
90