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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  */
30 namespace WebCore {
31 
32 class Position;
33 
34 class RenderBR : public RenderText {
35 public:
36     RenderBR(Node*);
37     virtual ~RenderBR();
38 
renderName()39     virtual const char* renderName() const { return "RenderBR"; }
40 
selectionRectForRepaint(RenderBoxModelObject *,bool)41     virtual IntRect selectionRectForRepaint(RenderBoxModelObject* /*repaintContainer*/, bool /*clipToVisibleContent*/) { return IntRect(); }
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
isBR()49     virtual bool isBR() const { return true; }
50 
51     virtual int caretMinOffset() const;
52     virtual int caretMaxOffset() const;
53     virtual unsigned caretMaxRenderedOffset() const;
54 
55     virtual VisiblePosition positionForPoint(const IntPoint&);
56 
57 protected:
58     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
59 
60 private:
61     mutable int m_lineHeight;
62 };
63 
64 
toRenderBR(RenderObject * object)65 inline RenderBR* toRenderBR(RenderObject* object)
66 {
67     ASSERT(!object || object->isBR());
68     return static_cast<RenderBR*>(object);
69 }
70 
toRenderBR(const RenderObject * object)71 inline const RenderBR* toRenderBR(const RenderObject* object)
72 {
73     ASSERT(!object || object->isBR());
74     return static_cast<const RenderBR*>(object);
75 }
76 
77 // This will catch anyone doing an unnecessary cast.
78 void toRenderBR(const RenderBR*);
79 
80 } // namespace WebCore
81 
82 #endif // RenderBR_h
83