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      1 /*
      2  * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef RenderScrollbar_h
     27 #define RenderScrollbar_h
     28 
     29 #include "RenderStyleConstants.h"
     30 #include "Scrollbar.h"
     31 #include <wtf/HashMap.h>
     32 
     33 namespace WebCore {
     34 
     35 class RenderBox;
     36 class RenderScrollbarPart;
     37 class RenderStyle;
     38 
     39 class RenderScrollbar : public Scrollbar {
     40 protected:
     41     RenderScrollbar(ScrollbarClient*, ScrollbarOrientation, RenderBox*);
     42 
     43 public:
     44     friend class Scrollbar;
     45     static PassRefPtr<Scrollbar> createCustomScrollbar(ScrollbarClient*, ScrollbarOrientation, RenderBox*);
     46     virtual ~RenderScrollbar();
     47 
     48     static ScrollbarPart partForStyleResolve();
     49     static RenderScrollbar* scrollbarForStyleResolve();
     50 
     51     RenderBox* owningRenderer() const { return m_owner; }
     52 
     53     void paintPart(GraphicsContext*, ScrollbarPart, const IntRect&);
     54 
     55     IntRect buttonRect(ScrollbarPart);
     56     IntRect trackRect(int startLength, int endLength);
     57     IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&);
     58 
     59     int minimumThumbLength();
     60 
     61 private:
     62     virtual void setParent(ScrollView*);
     63     virtual void setEnabled(bool);
     64 
     65     virtual void paint(GraphicsContext*, const IntRect& damageRect);
     66 
     67     virtual void setHoveredPart(ScrollbarPart);
     68     virtual void setPressedPart(ScrollbarPart);
     69 
     70     virtual void styleChanged();
     71 
     72     virtual bool isCustomScrollbar() const { return true; }
     73 
     74     void updateScrollbarParts(bool destroy = false);
     75 
     76     PassRefPtr<RenderStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId);
     77     void updateScrollbarPart(ScrollbarPart, bool destroy = false);
     78 
     79     RenderBox* m_owner;
     80     HashMap<unsigned, RenderScrollbarPart*> m_parts;
     81 };
     82 
     83 inline RenderScrollbar* toRenderScrollbar(Scrollbar* scrollbar)
     84 {
     85     ASSERT(!scrollbar || scrollbar->isCustomScrollbar());
     86     return static_cast<RenderScrollbar*>(scrollbar);
     87 }
     88 
     89 // This will catch anyone doing an unnecessary cast.
     90 void toRenderScrollbar(const RenderScrollbar*);
     91 
     92 } // namespace WebCore
     93 
     94 #endif // RenderScrollbar_h
     95