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#pragma once
24
25#include "RenderText.h"
26
27namespace WebCore {
28
29// Used to represent a text substring of an element, e.g., for text runs that are split because of
30// first letter and that must therefore have different styles (and positions in the render tree).
31// We cache offsets so that text transformations can be applied in such a way that we can recover
32// the original unaltered string from our corresponding DOM node.
33class RenderTextFragment final : public RenderText {
34 WTF_MAKE_ISO_ALLOCATED(RenderTextFragment);
35public:
36 RenderTextFragment(Text&, const String&, int startOffset, int length);
37 RenderTextFragment(Document&, const String&, int startOffset, int length);
38 RenderTextFragment(Document&, const String&);
39
40 virtual ~RenderTextFragment();
41
42 bool canBeSelectionLeaf() const override;
43
44 unsigned start() const { return m_start; }
45 unsigned end() const { return m_end; }
46
47 RenderBoxModelObject* firstLetter() const { return m_firstLetter.get(); }
48 void setFirstLetter(RenderBoxModelObject& firstLetter) { m_firstLetter = makeWeakPtr(firstLetter); }
49
50 RenderBlock* blockForAccompanyingFirstLetter();
51
52 void setContentString(const String& text);
53 StringImpl* contentString() const { return m_contentString.impl(); }
54
55 void setText(const String&, bool force = false) override;
56
57 const String& altText() const { return m_altText; }
58 void setAltText(const String& altText) { m_altText = altText; }
59
60private:
61 bool isTextFragment() const override { return true; }
62 void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
63
64 UChar previousCharacter() const override;
65
66 unsigned m_start;
67 unsigned m_end;
68 // Alternative description that can be used for accessibility instead of the native text.
69 String m_altText;
70 String m_contentString;
71 WeakPtr<RenderBoxModelObject> m_firstLetter;
72};
73
74} // namespace WebCore
75
76SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::RenderTextFragment)
77 static bool isType(const WebCore::RenderText& renderer) { return renderer.isTextFragment(); }
78 static bool isType(const WebCore::RenderObject& renderer) { return is<WebCore::RenderText>(renderer) && isType(downcast<WebCore::RenderText>(renderer)); }
79SPECIALIZE_TYPE_TRAITS_END()
80