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/*
* Copyright (C) 2012 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 "ScrollingTree.h"
#if ENABLE(THREADED_SCROLLING)
#include "PlatformWheelEvent.h"
#include "ScrollingCoordinator.h"
#include "ScrollingThread.h"
#include "ScrollingTreeNode.h"
#include "ScrollingTreeState.h"
#include <wtf/MainThread.h>
namespace WebCore {
PassRefPtr<ScrollingTree> ScrollingTree::create(ScrollingCoordinator* scrollingCoordinator)
{
return adoptRef(new ScrollingTree(scrollingCoordinator));
}
ScrollingTree::ScrollingTree(ScrollingCoordinator* scrollingCoordinator)
: m_scrollingCoordinator(scrollingCoordinator)
, m_rootNode(ScrollingTreeNode::create(this))
, m_hasWheelEventHandlers(false)
{
}
ScrollingTree::~ScrollingTree()
{
ASSERT(!m_scrollingCoordinator);
}
bool ScrollingTree::tryToHandleWheelEvent(const PlatformWheelEvent& wheelEvent)
{
{
MutexLocker lock(m_mutex);
if (m_hasWheelEventHandlers)
return false;
if (!m_nonFastScrollableRegion.isEmpty()) {
// FIXME: This is not correct for non-default scroll origins.
IntPoint position = wheelEvent.position();
position.moveBy(m_mainFrameScrollPosition);
if (m_nonFastScrollableRegion.contains(position))
return false;
}
}
ScrollingThread::dispatch(bind(&ScrollingTree::handleWheelEvent, this, wheelEvent));
return true;
}
void ScrollingTree::handleWheelEvent(const PlatformWheelEvent& wheelEvent)
{
ASSERT(ScrollingThread::isCurrentThread());
m_rootNode->handleWheelEvent(wheelEvent);
}
void ScrollingTree::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());
m_scrollingCoordinator = nullptr;
}
void ScrollingTree::commitNewTreeState(PassOwnPtr<ScrollingTreeState> scrollingTreeState)
{
ASSERT(ScrollingThread::isCurrentThread());
if (scrollingTreeState->changedProperties() & (ScrollingTreeState::WheelEventHandlerCount | ScrollingTreeState::NonFastScrollableRegion)) {
MutexLocker lock(m_mutex);
if (scrollingTreeState->changedProperties() & ScrollingTreeState::WheelEventHandlerCount)
m_hasWheelEventHandlers = scrollingTreeState->wheelEventHandlerCount();
if (scrollingTreeState->changedProperties() & ScrollingTreeState::NonFastScrollableRegion)
m_nonFastScrollableRegion = scrollingTreeState->nonFastScrollableRegion();
}
m_rootNode->update(scrollingTreeState.get());
}
void ScrollingTree::updateMainFrameScrollPosition(const IntPoint& scrollPosition)
{
if (!m_scrollingCoordinator)
return;
{
MutexLocker lock(m_mutex);
m_mainFrameScrollPosition = scrollPosition;
}
callOnMainThread(bind(&ScrollingCoordinator::updateMainFrameScrollPosition, m_scrollingCoordinator.get(), scrollPosition));
}
} // namespace WebCore
#endif // ENABLE(THREADED_SCROLLING)
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