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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 "ThreadedScrollingTree.h"
#if ENABLE(ASYNC_SCROLLING)
#include "AsyncScrollingCoordinator.h"
#include "PlatformWheelEvent.h"
#include "ScrollingThread.h"
#include "ScrollingTreeFixedNode.h"
#include "ScrollingTreeNode.h"
#include "ScrollingTreeScrollingNode.h"
#include "ScrollingTreeStickyNode.h"
#include <wtf/RunLoop.h>
#include <wtf/TemporaryChange.h>
namespace WebCore {
ThreadedScrollingTree::ThreadedScrollingTree(AsyncScrollingCoordinator* scrollingCoordinator)
: m_scrollingCoordinator(scrollingCoordinator)
{
}
ThreadedScrollingTree::~ThreadedScrollingTree()
{
// invalidate() should have cleared m_scrollingCoordinator.
ASSERT(!m_scrollingCoordinator);
}
ScrollingTree::EventResult ThreadedScrollingTree::tryToHandleWheelEvent(const PlatformWheelEvent& wheelEvent)
{
if (shouldHandleWheelEventSynchronously(wheelEvent))
return SendToMainThread;
if (willWheelEventStartSwipeGesture(wheelEvent))
return DidNotHandleEvent;
RefPtr<ThreadedScrollingTree> threadedScrollingTree(this);
ScrollingThread::dispatch([threadedScrollingTree, wheelEvent] {
threadedScrollingTree->handleWheelEvent(wheelEvent);
});
return DidHandleEvent;
}
void ThreadedScrollingTree::handleWheelEvent(const PlatformWheelEvent& wheelEvent)
{
ASSERT(ScrollingThread::isCurrentThread());
ScrollingTree::handleWheelEvent(wheelEvent);
}
void ThreadedScrollingTree::invalidate()
{
// Invalidate is dispatched by the ScrollingCoordinator class on the ScrollingThread
// to break the reference cycle between ScrollingTree and ScrollingCoordinator when the
// ScrollingCoordinator's page is destroyed.
ASSERT(ScrollingThread::isCurrentThread());
// Since this can potentially be the last reference to the scrolling coordinator,
// we need to release it on the main thread since it has member variables (such as timers)
// that expect to be destroyed from the main thread.
ScrollingCoordinator* scrollingCoordinator = m_scrollingCoordinator.release().leakRef();
RunLoop::main().dispatch([scrollingCoordinator] {
scrollingCoordinator->deref();
});
}
void ThreadedScrollingTree::commitNewTreeState(std::unique_ptr<ScrollingStateTree> scrollingStateTree)
{
ASSERT(ScrollingThread::isCurrentThread());
ScrollingTree::commitNewTreeState(WTFMove(scrollingStateTree));
}
void ThreadedScrollingTree::scrollingTreeNodeDidScroll(ScrollingNodeID nodeID, const FloatPoint& scrollPosition, SetOrSyncScrollingLayerPosition scrollingLayerPositionAction)
{
if (!m_scrollingCoordinator)
return;
if (nodeID == rootNode()->scrollingNodeID())
setMainFrameScrollPosition(scrollPosition);
RefPtr<AsyncScrollingCoordinator> scrollingCoordinator = m_scrollingCoordinator;
bool localIsHandlingProgrammaticScroll = isHandlingProgrammaticScroll();
RunLoop::main().dispatch([scrollingCoordinator, nodeID, scrollPosition, localIsHandlingProgrammaticScroll, scrollingLayerPositionAction] {
scrollingCoordinator->scheduleUpdateScrollPositionAfterAsyncScroll(nodeID, scrollPosition, localIsHandlingProgrammaticScroll, scrollingLayerPositionAction);
});
}
void ThreadedScrollingTree::currentSnapPointIndicesDidChange(ScrollingNodeID nodeID, unsigned horizontal, unsigned vertical)
{
if (!m_scrollingCoordinator)
return;
RefPtr<AsyncScrollingCoordinator> scrollingCoordinator = m_scrollingCoordinator;
RunLoop::main().dispatch([scrollingCoordinator, nodeID, horizontal, vertical] {
scrollingCoordinator->setActiveScrollSnapIndices(nodeID, horizontal, vertical);
});
}
#if PLATFORM(MAC)
void ThreadedScrollingTree::handleWheelEventPhase(PlatformWheelEventPhase phase)
{
if (!m_scrollingCoordinator)
return;
RefPtr<AsyncScrollingCoordinator> scrollingCoordinator = m_scrollingCoordinator;
RunLoop::main().dispatch([scrollingCoordinator, phase] {
scrollingCoordinator->handleWheelEventPhase(phase);
});
}
void ThreadedScrollingTree::setActiveScrollSnapIndices(ScrollingNodeID nodeID, unsigned horizontalIndex, unsigned verticalIndex)
{
if (!m_scrollingCoordinator)
return;
RefPtr<AsyncScrollingCoordinator> scrollingCoordinator = m_scrollingCoordinator;
RunLoop::main().dispatch([scrollingCoordinator, nodeID, horizontalIndex, verticalIndex] {
scrollingCoordinator->setActiveScrollSnapIndices(nodeID, horizontalIndex, verticalIndex);
});
}
void ThreadedScrollingTree::deferTestsForReason(WheelEventTestTrigger::ScrollableAreaIdentifier identifier, WheelEventTestTrigger::DeferTestTriggerReason reason)
{
if (!m_scrollingCoordinator)
return;
RefPtr<AsyncScrollingCoordinator> scrollingCoordinator = m_scrollingCoordinator;
RunLoop::main().dispatch([scrollingCoordinator, identifier, reason] {
scrollingCoordinator->deferTestsForReason(identifier, reason);
});
}
void ThreadedScrollingTree::removeTestDeferralForReason(WheelEventTestTrigger::ScrollableAreaIdentifier identifier, WheelEventTestTrigger::DeferTestTriggerReason reason)
{
if (!m_scrollingCoordinator)
return;
RefPtr<AsyncScrollingCoordinator> scrollingCoordinator = m_scrollingCoordinator;
RunLoop::main().dispatch([scrollingCoordinator, identifier, reason] {
scrollingCoordinator->removeTestDeferralForReason(identifier, reason);
});
}
#endif
} // namespace WebCore
#endif // ENABLE(ASYNC_SCROLLING)
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