#ifndef ScrollAnimator_h
#define ScrollAnimator_h
#include "FloatPoint.h"
#include "PlatformWheelEvent.h"
#include "ScrollTypes.h"
#include "WheelEventTestTrigger.h"
#include <wtf/FastMalloc.h>
#include <wtf/Forward.h>
#if ENABLE(RUBBER_BANDING) || ENABLE(CSS_SCROLL_SNAP)
#include "ScrollController.h"
#endif
namespace WebCore {
class FloatPoint;
class PlatformTouchEvent;
class ScrollableArea;
class Scrollbar;
class WheelEventTestTrigger;
#if ENABLE(CSS_SCROLL_SNAP) || ENABLE(RUBBER_BANDING)
class ScrollAnimator : private ScrollControllerClient {
#else
class ScrollAnimator {
#endif
WTF_MAKE_FAST_ALLOCATED;
public:
static std::unique_ptr<ScrollAnimator> create(ScrollableArea&);
explicit ScrollAnimator(ScrollableArea&);
virtual ~ScrollAnimator();
virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float multiplier);
virtual void scrollToOffsetWithoutAnimation(const FloatPoint&);
ScrollableArea& scrollableArea() const { return m_scrollableArea; }
virtual bool handleWheelEvent(const PlatformWheelEvent&);
#if ENABLE(TOUCH_EVENTS)
virtual bool handleTouchEvent(const PlatformTouchEvent&);
#endif
#if PLATFORM(COCOA)
virtual void handleWheelEventPhase(PlatformWheelEventPhase) { }
#endif
void setCurrentPosition(const FloatPoint&);
const FloatPoint& currentPosition() const { return m_currentPosition; }
virtual void cancelAnimations() { }
virtual void serviceScrollAnimations() { }
virtual void contentAreaWillPaint() const { }
virtual void mouseEnteredContentArea() { }
virtual void mouseExitedContentArea() { }
virtual void mouseMovedInContentArea() { }
virtual void mouseEnteredScrollbar(Scrollbar*) const { }
virtual void mouseExitedScrollbar(Scrollbar*) const { }
virtual void mouseIsDownInScrollbar(Scrollbar*, bool) const { }
virtual void willStartLiveResize() { }
virtual void contentsResized() const { }
virtual void willEndLiveResize() { }
virtual void contentAreaDidShow() { }
virtual void contentAreaDidHide() { }
virtual void lockOverlayScrollbarStateToHidden(bool) { }
virtual bool scrollbarsCanBeActive() const { return true; }
virtual void didAddVerticalScrollbar(Scrollbar*) { }
virtual void willRemoveVerticalScrollbar(Scrollbar*) { }
virtual void didAddHorizontalScrollbar(Scrollbar*) { }
virtual void willRemoveHorizontalScrollbar(Scrollbar*) { }
virtual void invalidateScrollbarPartLayers(Scrollbar*) { }
virtual void verticalScrollbarLayerDidChange() { }
virtual void horizontalScrollbarLayerDidChange() { }
virtual bool shouldScrollbarParticipateInHitTesting(Scrollbar*) { return true; }
virtual void notifyContentAreaScrolled(const FloatSize& delta) { UNUSED_PARAM(delta); }
virtual bool isRubberBandInProgress() const { return false; }
virtual bool isScrollSnapInProgress() const { return false; }
void setWheelEventTestTrigger(RefPtr<WheelEventTestTrigger>&& testTrigger) { m_wheelEventTestTrigger = testTrigger; }
#if (ENABLE(CSS_SCROLL_SNAP) || ENABLE(RUBBER_BANDING)) && PLATFORM(MAC)
void deferTestsForReason(WheelEventTestTrigger::ScrollableAreaIdentifier, WheelEventTestTrigger::DeferTestTriggerReason) const override;
void removeTestDeferralForReason(WheelEventTestTrigger::ScrollableAreaIdentifier, WheelEventTestTrigger::DeferTestTriggerReason) const override;
#endif
#if ENABLE(CSS_SCROLL_SNAP)
#if PLATFORM(MAC)
bool processWheelEventForScrollSnap(const PlatformWheelEvent&);
#endif
void updateScrollSnapState();
FloatPoint scrollOffset() const override;
void immediateScrollOnAxis(ScrollEventAxis, float delta) override;
bool activeScrollSnapIndexDidChange() const;
unsigned activeScrollSnapIndexForAxis(ScrollEventAxis) const;
LayoutSize scrollExtent() const override;
FloatSize viewportSize() const override;
#endif
protected:
virtual void notifyPositionChanged(const FloatSize& delta);
void updateActiveScrollSnapIndexForOffset();
ScrollableArea& m_scrollableArea;
RefPtr<WheelEventTestTrigger> m_wheelEventTestTrigger;
#if ENABLE(CSS_SCROLL_SNAP) || ENABLE(RUBBER_BANDING)
ScrollController m_scrollController;
#endif
FloatPoint m_currentPosition;
};
}
#endif // ScrollAnimator_h