WebCore/RenderScrollbarPart.h

   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