1/*
2 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB.  If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 *
19 */
20
21#ifndef RenderBR_h
22#define RenderBR_h
23
24#include "RenderText.h"
25
26/*
27 * The whole class here is a hack to get <br> working, as long as we don't have support for
28 * CSS2 :before and :after pseudo elements
29 */
30namespace WebCore {
31
32class Position;
33
34class RenderBR : public RenderText {
35public:
36    explicit RenderBR(Node*);
37    virtual ~RenderBR();
38
39    virtual const char* renderName() const { return "RenderBR"; }
40
41    virtual LayoutRect selectionRectForRepaint(const RenderLayerModelObject* /*repaintContainer*/, bool /*clipToVisibleContent*/) OVERRIDE { return LayoutRect(); }
42
43    virtual float width(unsigned /*from*/, unsigned /*len*/, const Font&, float /*xPos*/, HashSet<const SimpleFontData*>* = 0 /*fallbackFonts*/ , GlyphOverflow* = 0) const { return 0; }
44    virtual float width(unsigned /*from*/, unsigned /*len*/, float /*xpos*/, bool = false /*firstLine*/, HashSet<const SimpleFontData*>* = 0 /*fallbackFonts*/, GlyphOverflow* = 0) const { return 0; }
45
46    int lineHeight(bool firstLine) const;
47
48    // overrides
49    virtual bool isBR() const { return true; }
50
51    virtual int caretMinOffset() const;
52    virtual int caretMaxOffset() const;
53
54    virtual VisiblePosition positionForPoint(const LayoutPoint&);
55
56protected:
57    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
58
59private:
60    mutable int m_lineHeight;
61};
62
63
64inline RenderBR* toRenderBR(RenderObject* object)
65{
66    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isBR());
67    return static_cast<RenderBR*>(object);
68}
69
70inline const RenderBR* toRenderBR(const RenderObject* object)
71{
72    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isBR());
73    return static_cast<const RenderBR*>(object);
74}
75
76// This will catch anyone doing an unnecessary cast.
77void toRenderBR(const RenderBR*);
78
79} // namespace WebCore
80
81#endif // RenderBR_h
82