#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 : public Noncopyable {
public:
virtual ~ScrollbarTheme() {};
virtual bool paint(Scrollbar*, GraphicsContext*, const IntRect& ) { 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 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) { context->fillRect(cornerRect, Color::white, DeviceColorSpace); }
virtual bool shouldCenterOnThumb(Scrollbar*, const PlatformMouseEvent&) { return false; }
virtual bool shouldSnapBackToDragOrigin(Scrollbar*, const PlatformMouseEvent&) { return false; }
virtual int thumbPosition(Scrollbar*) { return 0; } virtual int thumbLength(Scrollbar*) { return 0; } virtual int trackPosition(Scrollbar*) { return 0; } virtual int trackLength(Scrollbar*) { return 0; }
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(); };
}
#endif