1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121
|
/*
* Copyright (C) 2014 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/MainThread.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;
ScrollingThread::dispatch(bind(&ThreadedScrollingTree::handleWheelEvent, this, wheelEvent));
return DidHandleEvent;
}
void ThreadedScrollingTree::handleWheelEvent(const PlatformWheelEvent& wheelEvent)
{
ASSERT(ScrollingThread::isCurrentThread());
ScrollingTree::handleWheelEvent(wheelEvent);
}
static void derefScrollingCoordinator(ScrollingCoordinator* scrollingCoordinator)
{
ASSERT(isMainThread());
scrollingCoordinator->deref();
}
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.
callOnMainThread(bind(derefScrollingCoordinator, m_scrollingCoordinator.release().leakRef()));
}
void ThreadedScrollingTree::commitNewTreeState(PassOwnPtr<ScrollingStateTree> scrollingStateTree)
{
ASSERT(ScrollingThread::isCurrentThread());
ScrollingTree::commitNewTreeState(scrollingStateTree);
}
void ThreadedScrollingTree::scrollingTreeNodeDidScroll(ScrollingNodeID nodeID, const FloatPoint& scrollPosition, SetOrSyncScrollingLayerPosition scrollingLayerPositionAction)
{
if (!m_scrollingCoordinator)
return;
if (nodeID == rootNode()->scrollingNodeID())
setMainFrameScrollPosition(scrollPosition);
callOnMainThread(bind(&AsyncScrollingCoordinator::scheduleUpdateScrollPositionAfterAsyncScroll, m_scrollingCoordinator.get(), nodeID, scrollPosition, isHandlingProgrammaticScroll(), scrollingLayerPositionAction));
}
#if PLATFORM(MAC)
void ThreadedScrollingTree::handleWheelEventPhase(PlatformWheelEventPhase phase)
{
if (!m_scrollingCoordinator)
return;
callOnMainThread(bind(&ScrollingCoordinator::handleWheelEventPhase, m_scrollingCoordinator.get(), phase));
}
#endif
} // namespace WebCore
#endif // ENABLE(ASYNC_SCROLLING)
|