WebCore/RenderScrollbarTheme.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 RenderScrollbarTheme_h
  27 #define RenderScrollbarTheme_h
  28
  29 #include "ScrollbarThemeComposite.h"
  30
  31 namespace WebCore {
  32
  33 class PlatformMouseEvent;
  34 class Scrollbar;
  35 class ScrollView;
  36
  37 class RenderScrollbarTheme : public ScrollbarThemeComposite {
  38 public:
  39     virtual ~RenderScrollbarTheme() {};
  40
  41     virtual int scrollbarThickness(ScrollbarControlSize controlSize) { return ScrollbarTheme::nativeTheme()->scrollbarThickness(controlSize); }
  42
  43     virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarTheme::nativeTheme()->buttonsPlacement(); }
  44
  45     virtual bool supportsControlTints() const { return true; }
  46
  47     virtual void paintScrollCorner(ScrollView*, GraphicsContext* context, const IntRect& cornerRect);
  48
  49     virtual bool shouldCenterOnThumb(Scrollbar* scrollbar, const PlatformMouseEvent& event) { return ScrollbarTheme::nativeTheme()->shouldCenterOnThumb(scrollbar, event); }
  50
  51     virtual double initialAutoscrollTimerDelay() { return ScrollbarTheme::nativeTheme()->initialAutoscrollTimerDelay(); }
  52     virtual double autoscrollTimerDelay() { return ScrollbarTheme::nativeTheme()->autoscrollTimerDelay(); }
  53
  54     virtual void registerScrollbar(Scrollbar* scrollbar) { return ScrollbarTheme::nativeTheme()->registerScrollbar(scrollbar); }
  55     virtual void unregisterScrollbar(Scrollbar* scrollbar) { return ScrollbarTheme::nativeTheme()->unregisterScrollbar(scrollbar); }
  56
  57     virtual int minimumThumbLength(Scrollbar*);
  58
  59     void buttonSizesAlongTrackAxis(Scrollbar* scrollbar, int& beforeSize, int& afterSize);
  60
  61     static RenderScrollbarTheme* renderScrollbarTheme();
  62
  63 protected:
  64     virtual bool hasButtons(Scrollbar*);
  65     virtual bool hasThumb(Scrollbar*);
  66
  67     virtual IntRect backButtonRect(Scrollbar*, ScrollbarPart, bool painting = false);
  68     virtual IntRect forwardButtonRect(Scrollbar*, ScrollbarPart, bool painting = false);
  69     virtual IntRect trackRect(Scrollbar*, bool painting = false);
  70
  71     virtual void paintScrollbarBackground(GraphicsContext*, Scrollbar*);
  72     virtual void paintTrackBackground(GraphicsContext*, Scrollbar*, const IntRect&);
  73     virtual void paintTrackPiece(GraphicsContext*, Scrollbar*, const IntRect&, ScrollbarPart);
  74     virtual void paintButton(GraphicsContext*, Scrollbar*, const IntRect&, ScrollbarPart);
  75     virtual void paintThumb(GraphicsContext*, Scrollbar*, const IntRect&);
  76
  77     virtual IntRect constrainTrackRectToTrackPieces(Scrollbar*, const IntRect&);
  78 };
  79
  80 } // namespace WebCore
  81
  82 #endif // RenderScrollbarTheme_h