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      1 /*
      2  * Copyright (C) 2008 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 RenderScrollbarPart_h
     27 #define RenderScrollbarPart_h
     28 
     29 #include "RenderBlock.h"
     30 #include "ScrollTypes.h"
     31 
     32 namespace WebCore {
     33 
     34 class RenderScrollbar;
     35 
     36 class RenderScrollbarPart : public RenderBlock {
     37 public:
     38     RenderScrollbarPart(Node*, RenderScrollbar* = 0, ScrollbarPart = NoPart);
     39     virtual ~RenderScrollbarPart();
     40 
     41     virtual const char* renderName() const { return "RenderScrollbarPart"; }
     42 
     43     virtual bool requiresLayer() const { return false; }
     44 
     45     virtual void layout();
     46     virtual void calcPrefWidths();
     47 
     48     void paintIntoRect(GraphicsContext*, int tx, int ty, const IntRect&);
     49 
     50 protected:
     51     virtual void styleWillChange(StyleDifference diff, const RenderStyle* newStyle);
     52     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
     53     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0);
     54 
     55 private:
     56     void layoutHorizontalPart();
     57     void layoutVerticalPart();
     58 
     59     void computeScrollbarWidth();
     60     void computeScrollbarHeight();
     61 
     62     RenderScrollbar* m_scrollbar;
     63     ScrollbarPart m_part;
     64 };
     65 
     66 } // namespace WebCore
     67 
     68 #endif // RenderScrollbarPart_h
     69