WebCore/platform/ScrollbarThemeComposite.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 ScrollbarThemeComposite_h
  27 #define ScrollbarThemeComposite_h
  28
  29 #include "ScrollbarTheme.h"
  30
  31 namespace WebCore {
  32
  33 class ScrollbarThemeComposite : public ScrollbarTheme {
  34 public:
  35     virtual bool paint(Scrollbar*, GraphicsContext* context, const IntRect& damageRect);
  36
  37     virtual ScrollbarPart hitTest(Scrollbar*, const PlatformMouseEvent&);
  38
  39     virtual void invalidatePart(Scrollbar*, ScrollbarPart);
  40
  41     virtual int thumbPosition(Scrollbar*);
  42     virtual int thumbLength(Scrollbar*);
  43     virtual int trackPosition(Scrollbar*);
  44     virtual int trackLength(Scrollbar*);
  45
  46     virtual void paintScrollCorner(ScrollView*, GraphicsContext*, const IntRect& cornerRect);
  47
  48 protected:
  49     virtual bool hasButtons(Scrollbar*) = 0;
  50     virtual bool hasThumb(Scrollbar*) = 0;
  51
  52     virtual IntRect backButtonRect(Scrollbar*, ScrollbarPart, bool painting = false) = 0;
  53     virtual IntRect forwardButtonRect(Scrollbar*, ScrollbarPart, bool painting = false) = 0;
  54     virtual IntRect trackRect(Scrollbar*, bool painting = false) = 0;
  55
  56     virtual void splitTrack(Scrollbar*, const IntRect& track, IntRect& startTrack, IntRect& thumb, IntRect& endTrack);
  57
  58     virtual int minimumThumbLength(Scrollbar*);
  59
  60     virtual void paintScrollbarBackground(GraphicsContext*, Scrollbar*) {}
  61     virtual void paintTrackBackground(GraphicsContext*, Scrollbar*, const IntRect&) {}
  62     virtual void paintTrackPiece(GraphicsContext*, Scrollbar*, const IntRect&, ScrollbarPart) {}
  63     virtual void paintButton(GraphicsContext*, Scrollbar*, const IntRect&, ScrollbarPart) {}
  64     virtual void paintThumb(GraphicsContext*, Scrollbar*, const IntRect&) {}
  65     virtual void paintTickmarks(GraphicsContext*, Scrollbar*, const IntRect&) {}
  66
  67     virtual IntRect constrainTrackRectToTrackPieces(Scrollbar*, const IntRect& rect) { return rect; }
  68 };
  69
  70 }
  71 #endif