#ifndef ScrollbarTheme_h
#define ScrollbarTheme_h
#include "platform/PlatformExport.h"
#include "platform/geometry/IntRect.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/scroll/ScrollTypes.h"
namespace WebCore {
class PlatformMouseEvent;
class ScrollbarThemeClient;
class ScrollView;
class PLATFORM_EXPORT ScrollbarTheme {
WTF_MAKE_NONCOPYABLE(ScrollbarTheme); WTF_MAKE_FAST_ALLOCATED;
public:
ScrollbarTheme() { }
virtual ~ScrollbarTheme() { }
virtual void updateEnabledState(ScrollbarThemeClient*) { }
virtual bool paint(ScrollbarThemeClient*, GraphicsContext*, const IntRect& damageRect);
virtual ScrollbarPart hitTest(ScrollbarThemeClient*, const IntPoint&);
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 updateScrollbarOverlayStyle(ScrollbarThemeClient*) { }
virtual bool invalidateOnMouseEnterExit() { return false; }
void invalidateParts(ScrollbarThemeClient* 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(ScrollbarThemeClient*, ScrollbarPart);
virtual void paintScrollCorner(GraphicsContext*, const IntRect& cornerRect);
virtual void paintTickmarks(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) { }
virtual void paintOverhangBackground(GraphicsContext*, const IntRect&, const IntRect&, const IntRect&);
virtual void paintOverhangShadows(GraphicsContext*, const IntSize&, const IntRect&, const IntRect&, const IntRect&) { }
virtual bool shouldCenterOnThumb(ScrollbarThemeClient*, const PlatformMouseEvent&);
virtual bool shouldSnapBackToDragOrigin(ScrollbarThemeClient*, const PlatformMouseEvent&);
virtual bool shouldDragDocumentInsteadOfThumb(ScrollbarThemeClient*, const PlatformMouseEvent&) { return false; }
virtual int thumbPosition(ScrollbarThemeClient*);
virtual int thumbLength(ScrollbarThemeClient*);
virtual int trackPosition(ScrollbarThemeClient*);
virtual int trackLength(ScrollbarThemeClient*);
virtual bool hasButtons(ScrollbarThemeClient*) = 0;
virtual bool hasThumb(ScrollbarThemeClient*) = 0;
virtual IntRect backButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool painting = false) = 0;
virtual IntRect forwardButtonRect(ScrollbarThemeClient*, ScrollbarPart, bool painting = false) = 0;
virtual IntRect trackRect(ScrollbarThemeClient*, bool painting = false) = 0;
virtual IntRect thumbRect(ScrollbarThemeClient*);
virtual int thumbThickness(ScrollbarThemeClient*);
virtual int minimumThumbLength(ScrollbarThemeClient*);
virtual void splitTrack(ScrollbarThemeClient*, const IntRect& track, IntRect& startTrack, IntRect& thumb, IntRect& endTrack);
virtual void paintScrollbarBackground(GraphicsContext*, ScrollbarThemeClient*) { }
virtual void paintTrackBackground(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) { }
virtual void paintTrackPiece(GraphicsContext*, ScrollbarThemeClient*, const IntRect&, ScrollbarPart) { }
virtual void paintButton(GraphicsContext*, ScrollbarThemeClient*, const IntRect&, ScrollbarPart) { }
virtual void paintThumb(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) { }
virtual int maxOverlapBetweenPages() { return std::numeric_limits<int>::max(); }
virtual double initialAutoscrollTimerDelay() { return 0.25; }
virtual double autoscrollTimerDelay() { return 0.05; }
virtual IntRect constrainTrackRectToTrackPieces(ScrollbarThemeClient*, const IntRect& rect) { return rect; }
virtual void registerScrollbar(ScrollbarThemeClient*) { }
virtual void unregisterScrollbar(ScrollbarThemeClient*) { }
virtual bool isMockTheme() const { return false; }
static ScrollbarTheme* theme();
static void setMockScrollbarsEnabled(bool flag);
static bool mockScrollbarsEnabled();
private:
static ScrollbarTheme* nativeTheme();
static bool gMockScrollbarsEnabled;
};
}
#endif