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 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.
34class RenderTextFragment FINAL : public RenderText {
35public:
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
62protected:
63    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
64
65private:
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
78DEFINE_TYPE_CASTS(RenderTextFragment, RenderObject, object, toRenderText(object)->isTextFragment(), toRenderText(object).isTextFragment());
79
80} // namespace blink
81
82#endif // RenderTextFragment_h
83