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/*
* Copyright (C) 2014-2015 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. AND ITS CONTRIBUTORS ``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 ITS 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.
*/
#pragma once
#if ENABLE(ASYNC_SCROLLING)
#include "ScrollingCoordinator.h"
#include "ScrollingTree.h"
#include "Timer.h"
#include <wtf/RefPtr.h>
namespace WebCore {
class Page;
class Scrollbar;
class ScrollingStateNode;
class ScrollingStateScrollingNode;
class ScrollingStateTree;
// ScrollingCoordinator subclass that maintains a ScrollingStateTree and a ScrollingTree,
// allowing asynchronous scrolling (in another thread or process).
class AsyncScrollingCoordinator : public ScrollingCoordinator {
public:
static Ref<AsyncScrollingCoordinator> create(Page*);
WEBCORE_EXPORT virtual ~AsyncScrollingCoordinator();
ScrollingTree* scrollingTree() const { return m_scrollingTree.get(); }
void scrollingStateTreePropertiesChanged();
WEBCORE_EXPORT void scheduleUpdateScrollPositionAfterAsyncScroll(ScrollingNodeID, const FloatPoint&, const std::optional<FloatPoint>& layoutViewportOrigin, bool programmaticScroll, ScrollingLayerPositionAction);
#if PLATFORM(COCOA)
WEBCORE_EXPORT void setActiveScrollSnapIndices(ScrollingNodeID, unsigned horizontalIndex, unsigned verticalIndex);
void deferTestsForReason(WheelEventTestTrigger::ScrollableAreaIdentifier, WheelEventTestTrigger::DeferTestTriggerReason) const;
void removeTestDeferralForReason(WheelEventTestTrigger::ScrollableAreaIdentifier, WheelEventTestTrigger::DeferTestTriggerReason) const;
#endif
#if ENABLE(CSS_SCROLL_SNAP)
WEBCORE_EXPORT void updateScrollSnapPropertiesWithFrameView(const FrameView&) override;
#endif
WEBCORE_EXPORT void updateExpectsWheelEventTestTriggerWithFrameView(const FrameView&) override;
void reportExposedUnfilledArea(MonotonicTime, unsigned unfilledArea);
void reportSynchronousScrollingReasonsChanged(MonotonicTime, SynchronousScrollingReasons);
protected:
WEBCORE_EXPORT AsyncScrollingCoordinator(Page*);
void setScrollingTree(Ref<ScrollingTree>&& scrollingTree) { m_scrollingTree = WTFMove(scrollingTree); }
ScrollingStateTree* scrollingStateTree() { return m_scrollingStateTree.get(); }
RefPtr<ScrollingTree> releaseScrollingTree() { return WTFMove(m_scrollingTree); }
void updateScrollPositionAfterAsyncScroll(ScrollingNodeID, const FloatPoint&, std::optional<FloatPoint> layoutViewportOrigin, bool programmaticScroll, ScrollingLayerPositionAction);
WEBCORE_EXPORT String scrollingStateTreeAsText(ScrollingStateTreeAsTextBehavior = ScrollingStateTreeAsTextBehaviorNormal) const override;
WEBCORE_EXPORT void willCommitTree() override;
bool eventTrackingRegionsDirty() const { return m_eventTrackingRegionsDirty; }
private:
bool isAsyncScrollingCoordinator() const override { return true; }
bool hasVisibleSlowRepaintViewportConstrainedObjects(const FrameView&) const override { return false; }
bool visualViewportEnabled() const;
WEBCORE_EXPORT void frameViewLayoutUpdated(FrameView&) override;
WEBCORE_EXPORT void frameViewRootLayerDidChange(FrameView&) override;
WEBCORE_EXPORT void frameViewEventTrackingRegionsChanged(FrameView&) override;
WEBCORE_EXPORT bool requestScrollPositionUpdate(FrameView&, const IntPoint&) override;
WEBCORE_EXPORT ScrollingNodeID attachToStateTree(ScrollingNodeType, ScrollingNodeID newNodeID, ScrollingNodeID parentID) override;
WEBCORE_EXPORT void detachFromStateTree(ScrollingNodeID) override;
WEBCORE_EXPORT void clearStateTree() override;
WEBCORE_EXPORT void updateNodeLayer(ScrollingNodeID, GraphicsLayer*) override;
WEBCORE_EXPORT void updateNodeViewportConstraints(ScrollingNodeID, const ViewportConstraints&) override;
WEBCORE_EXPORT void updateFrameScrollingNode(ScrollingNodeID, GraphicsLayer* scrollLayer, GraphicsLayer* scrolledContentsLayer, GraphicsLayer* counterScrollingLayer, GraphicsLayer* insetClipLayer, const ScrollingGeometry* = nullptr) override;
WEBCORE_EXPORT void updateOverflowScrollingNode(ScrollingNodeID, GraphicsLayer* scrollLayer, GraphicsLayer* scrolledContentsLayer, const ScrollingGeometry* = nullptr) override;
WEBCORE_EXPORT void reconcileScrollingState(FrameView&, const FloatPoint&, const LayoutViewportOriginOrOverrideRect&, bool programmaticScroll, ViewportRectStability, ScrollingLayerPositionAction) override;
bool isRubberBandInProgress() const override;
void setScrollPinningBehavior(ScrollPinningBehavior) override;
#if ENABLE(CSS_SCROLL_SNAP)
bool isScrollSnapInProgress() const override;
#endif
WEBCORE_EXPORT void reconcileViewportConstrainedLayerPositions(const LayoutRect& viewportRect, ScrollingLayerPositionAction) override;
WEBCORE_EXPORT void scrollableAreaScrollbarLayerDidChange(ScrollableArea&, ScrollbarOrientation) override;
WEBCORE_EXPORT void setSynchronousScrollingReasons(FrameView&, SynchronousScrollingReasons) final;
virtual void scheduleTreeStateCommit() = 0;
void ensureRootStateNodeForFrameView(FrameView&);
void updateScrollLayerPosition(FrameView&);
void updateScrollPositionAfterAsyncScrollTimerFired();
void setEventTrackingRegionsDirty();
void updateEventTrackingRegions();
FrameView* frameViewForScrollingNode(ScrollingNodeID) const;
Timer m_updateNodeScrollPositionTimer;
struct ScheduledScrollUpdate {
ScheduledScrollUpdate() = default;
ScheduledScrollUpdate(ScrollingNodeID scrollingNodeID, FloatPoint point, std::optional<FloatPoint> viewportOrigin, bool isProgrammatic, ScrollingLayerPositionAction udpateAction)
: nodeID(scrollingNodeID)
, scrollPosition(point)
, layoutViewportOrigin(viewportOrigin)
, isProgrammaticScroll(isProgrammatic)
, updateLayerPositionAction(udpateAction)
{ }
ScrollingNodeID nodeID { 0 };
FloatPoint scrollPosition;
std::optional<FloatPoint> layoutViewportOrigin;
bool isProgrammaticScroll { false };
ScrollingLayerPositionAction updateLayerPositionAction { ScrollingLayerPositionAction::Sync };
bool matchesUpdateType(const ScheduledScrollUpdate& other) const
{
return nodeID == other.nodeID
&& isProgrammaticScroll == other.isProgrammaticScroll
&& updateLayerPositionAction == other.updateLayerPositionAction;
}
};
ScheduledScrollUpdate m_scheduledScrollUpdate;
std::unique_ptr<ScrollingStateTree> m_scrollingStateTree;
RefPtr<ScrollingTree> m_scrollingTree;
bool m_eventTrackingRegionsDirty { false };
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_SCROLLING_COORDINATOR(WebCore::AsyncScrollingCoordinator, isAsyncScrollingCoordinator());
#endif // ENABLE(ASYNC_SCROLLING)
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