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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ScrollbarTheme_h
#define ScrollbarTheme_h
#include "GraphicsContext.h"
#include "IntRect.h"
#include "ScrollTypes.h"
namespace WebCore {
class PlatformMouseEvent;
class Scrollbar;
class ScrollView;
class ScrollbarTheme {
WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED;
public:
ScrollbarTheme() { }
virtual ~ScrollbarTheme() {};
virtual bool paint(Scrollbar*, GraphicsContext*, const IntRect& /*damageRect*/) { return false; }
virtual ScrollbarPart hitTest(Scrollbar*, const PlatformMouseEvent&) { return NoPart; }
virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar) { return 0; }
virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarButtonsSingle; }
virtual bool supportsControlTints() const { return false; }
virtual bool usesOverlayScrollbars() const { return false; }
virtual void themeChanged() {}
virtual bool invalidateOnMouseEnterExit() { return false; }
void invalidateParts(Scrollbar* scrollbar, ScrollbarControlPartMask mask)
{
if (mask & BackButtonStartPart)
invalidatePart(scrollbar, BackButtonStartPart);
if (mask & ForwardButtonStartPart)
invalidatePart(scrollbar, ForwardButtonStartPart);
if (mask & BackTrackPart)
invalidatePart(scrollbar, BackTrackPart);
if (mask & ThumbPart)
invalidatePart(scrollbar, ThumbPart);
if (mask & ForwardTrackPart)
invalidatePart(scrollbar, ForwardTrackPart);
if (mask & BackButtonEndPart)
invalidatePart(scrollbar, BackButtonEndPart);
if (mask & ForwardButtonEndPart)
invalidatePart(scrollbar, ForwardButtonEndPart);
}
virtual void invalidatePart(Scrollbar*, ScrollbarPart) {}
virtual void paintScrollCorner(ScrollView*, GraphicsContext* context, const IntRect& cornerRect) { defaultPaintScrollCorner(context, cornerRect); }
static void defaultPaintScrollCorner(GraphicsContext* context, const IntRect& cornerRect) { context->fillRect(cornerRect, Color::white, ColorSpaceDeviceRGB); }
virtual bool shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent&) { return false; }
virtual bool shouldSnapBackToDragOrigin(Scrollbar*, const PlatformMouseEvent&) { return false; }
virtual int thumbPosition(Scrollbar*) { return 0; } // The position of the thumb relative to the track.
virtual int thumbLength(Scrollbar*) { return 0; } // The length of the thumb along the axis of the scrollbar.
virtual int trackPosition(Scrollbar*) { return 0; } // The position of the track relative to the scrollbar.
virtual int trackLength(Scrollbar*) { return 0; } // The length of the track along the axis of the scrollbar.
virtual int maxOverlapBetweenPages() { return std::numeric_limits<int>::max(); }
virtual double initialAutoscrollTimerDelay() { return 0.25; }
virtual double autoscrollTimerDelay() { return 0.05; }
virtual void registerScrollbar(Scrollbar*) {}
virtual void unregisterScrollbar(Scrollbar*) {}
static ScrollbarTheme* nativeTheme(); // Must be implemented to return the correct theme subclass.
};
}
#endif
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