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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.
*/
#include "config.h"
#include "ThreadedScrollingCoordinator.h"
#if ENABLE(ASYNC_SCROLLING) && ENABLE(SCROLLING_THREAD)
#include "Logging.h"
#include "Page.h"
#include "ScrollingThread.h"
#include "ThreadedScrollingTree.h"
#include "WheelEventTestMonitor.h"
namespace WebCore {
ThreadedScrollingCoordinator::ThreadedScrollingCoordinator(Page* page)
: AsyncScrollingCoordinator(page)
{
}
ThreadedScrollingCoordinator::~ThreadedScrollingCoordinator() = default;
void ThreadedScrollingCoordinator::pageDestroyed()
{
AsyncScrollingCoordinator::pageDestroyed();
// Invalidating the scrolling tree will break the reference cycle between the ScrollingCoordinator and ScrollingTree objects.
RefPtr scrollingTree = static_pointer_cast<ThreadedScrollingTree>(releaseScrollingTree());
ScrollingThread::dispatch([scrollingTree = WTFMove(scrollingTree)] {
scrollingTree->invalidate();
});
}
void ThreadedScrollingCoordinator::commitTreeStateIfNeeded()
{
willCommitTree();
LOG_WITH_STREAM(Scrolling, stream << "ThreadedScrollingCoordinator::commitTreeState, has changes " << scrollingStateTree()->hasChangedProperties());
if (!scrollingStateTree()->hasChangedProperties())
return;
LOG_WITH_STREAM(ScrollingTree, stream << "ThreadedScrollingCoordinator::commitTreeState: state tree " << scrollingStateTreeAsText(debugScrollingStateTreeAsTextBehaviors));
auto stateTree = scrollingStateTree()->commit(LayerRepresentation::PlatformLayerRepresentation);
scrollingTree()->commitTreeState(WTFMove(stateTree));
}
WheelEventHandlingResult ThreadedScrollingCoordinator::handleWheelEventForScrolling(const PlatformWheelEvent& wheelEvent, ScrollingNodeID targetNodeID, std::optional<WheelScrollGestureState> gestureState)
{
ASSERT(isMainThread());
ASSERT(m_page);
ASSERT(scrollingTree());
if (scrollingTree()->willWheelEventStartSwipeGesture(wheelEvent))
return WheelEventHandlingResult::unhandled();
LOG_WITH_STREAM(Scrolling, stream << "ThreadedScrollingCoordinator::handleWheelEventForScrolling " << wheelEvent << " - sending event to scrolling thread, node " << targetNodeID << " gestureState " << gestureState);
auto deferrer = WheelEventTestMonitorCompletionDeferrer { m_page->wheelEventTestMonitor().get(), reinterpret_cast<WheelEventTestMonitor::ScrollableAreaIdentifier>(targetNodeID), WheelEventTestMonitor::PostMainThreadWheelEventHandling };
RefPtr<ThreadedScrollingTree> threadedScrollingTree = downcast<ThreadedScrollingTree>(scrollingTree());
ScrollingThread::dispatch([threadedScrollingTree, wheelEvent, targetNodeID, gestureState, deferrer = WTFMove(deferrer)] {
threadedScrollingTree->handleWheelEventAfterMainThread(wheelEvent, targetNodeID, gestureState);
});
return WheelEventHandlingResult::handled();
}
void ThreadedScrollingCoordinator::wheelEventWasProcessedByMainThread(const PlatformWheelEvent& wheelEvent, std::optional<WheelScrollGestureState> gestureState)
{
LOG_WITH_STREAM(Scrolling, stream << "ThreadedScrollingCoordinator::wheelEventWasProcessedByMainThread " << gestureState);
RefPtr<ThreadedScrollingTree> threadedScrollingTree = downcast<ThreadedScrollingTree>(scrollingTree());
threadedScrollingTree->wheelEventWasProcessedByMainThread(wheelEvent, gestureState);
}
void ThreadedScrollingCoordinator::scheduleTreeStateCommit()
{
scheduleRenderingUpdate();
}
void ThreadedScrollingCoordinator::didScheduleRenderingUpdate()
{
RefPtr<ThreadedScrollingTree> threadedScrollingTree = downcast<ThreadedScrollingTree>(scrollingTree());
threadedScrollingTree->didScheduleRenderingUpdate();
}
void ThreadedScrollingCoordinator::willStartRenderingUpdate()
{
RefPtr<ThreadedScrollingTree> threadedScrollingTree = downcast<ThreadedScrollingTree>(scrollingTree());
threadedScrollingTree->willStartRenderingUpdate();
commitTreeStateIfNeeded();
synchronizeStateFromScrollingTree();
}
void ThreadedScrollingCoordinator::didCompleteRenderingUpdate()
{
downcast<ThreadedScrollingTree>(scrollingTree())->didCompleteRenderingUpdate();
// When scroll animations are running on the scrolling thread, we need something to continually tickle the
// DisplayRefreshMonitor so that ThreadedScrollingTree::displayDidRefresh() will get called to service those animations.
// We can achieve this by scheduling a rendering update; this won't cause extra work, since scrolling thread scrolls
// will end up triggering these anyway.
if (scrollingTree()->hasNodeWithActiveScrollAnimations())
scheduleRenderingUpdate();
}
void ThreadedScrollingCoordinator::hasNodeWithAnimatedScrollChanged(bool hasAnimatingNode)
{
// This is necessary to trigger a rendering update, after which the code in
// AsyncScrollingCoordinator::didCompleteRenderingUpdate() triggers the rest.
if (hasAnimatingNode)
scheduleRenderingUpdate();
}
void ThreadedScrollingCoordinator::startMonitoringWheelEvents(bool clearLatchingState)
{
// setIsMonitoringWheelEvents() is called on the root node via AsyncScrollingCoordinator::frameViewLayoutUpdated().
if (clearLatchingState)
scrollingTree()->clearLatchedNode();
}
} // namespace WebCore
#endif // ENABLE(ASYNC_SCROLLING) && ENABLE(SCROLLING_THREAD)
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