#ifndef ScrollbarTheme_h
#define ScrollbarTheme_h
#include "GraphicsContext.h"
#include "IntRect.h"
#include "ScrollTypes.h"
namespace WebCore {
class PlatformMouseEvent;
class Scrollbar;
class ScrollView;
#if ENABLE(RUBBER_BANDING)
class GraphicsLayer;
#endif
class ScrollbarTheme {
WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED;
public:
ScrollbarTheme() = default;
virtual ~ScrollbarTheme() {};
virtual void updateEnabledState(Scrollbar&) { }
virtual bool paint(Scrollbar&, GraphicsContext&, const IntRect& ) { return false; }
virtual ScrollbarPart hitTest(Scrollbar&, const IntPoint&) { return NoPart; }
virtual int scrollbarThickness(ScrollbarControlSize = RegularScrollbar, ScrollbarExpansionState = ScrollbarExpansionState::Expanded) { return 0; }
virtual ScrollbarButtonsPlacement buttonsPlacement() const { return ScrollbarButtonsSingle; }
virtual bool supportsControlTints() const { return false; }
virtual bool usesOverlayScrollbars() const { return false; }
virtual void usesOverlayScrollbarsChanged() { }
virtual void updateScrollbarOverlayStyle(Scrollbar&) { }
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); }
virtual void paintTickmarks(GraphicsContext&, Scrollbar&, const IntRect&) { }
virtual void paintOverhangAreas(ScrollView&, GraphicsContext&, const IntRect&, const IntRect&, const IntRect&) { }
#if ENABLE(RUBBER_BANDING)
virtual void setUpOverhangAreasLayerContents(GraphicsLayer*, const Color&) { }
virtual void setUpContentShadowLayer(GraphicsLayer*) { }
#endif
virtual ScrollbarButtonPressAction handleMousePressEvent(Scrollbar&, const PlatformMouseEvent&, ScrollbarPart);
virtual bool shouldSnapBackToDragOrigin(Scrollbar&, const PlatformMouseEvent&) { return false; }
virtual bool shouldDragDocumentInsteadOfThumb(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 Seconds initialAutoscrollTimerDelay() { return 250_ms; }
virtual Seconds autoscrollTimerDelay() { return 50_ms; }
virtual void registerScrollbar(Scrollbar&) { }
virtual void unregisterScrollbar(Scrollbar&) { }
virtual bool isMockTheme() const { return false; }
WEBCORE_EXPORT static ScrollbarTheme& theme();
private:
static ScrollbarTheme& nativeTheme(); };
}
#endif