Source/WebKit2/UIProcess/Scrolling/RemoteScrollingTree.cpp

/*
 * 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 "RemoteScrollingTree.h"

#if ENABLE(ASYNC_SCROLLING)

#include "RemoteLayerTreeHost.h"
#include "RemoteScrollingCoordinatorProxy.h"
#include <WebCore/ScrollingTreeFixedNode.h>
#include <WebCore/ScrollingTreeStickyNode.h>

#if PLATFORM(IOS)
#include <WebCore/ScrollingTreeScrollingNodeIOS.h>
#else
#include <WebCore/ScrollingTreeScrollingNodeMac.h>
#endif

using namespace WebCore;

namespace WebKit {

RefPtr<RemoteScrollingTree> RemoteScrollingTree::create(RemoteScrollingCoordinatorProxy& scrollingCoordinator)
{
    return adoptRef(new RemoteScrollingTree(scrollingCoordinator));
}

RemoteScrollingTree::RemoteScrollingTree(RemoteScrollingCoordinatorProxy& scrollingCoordinator)
    : m_scrollingCoordinatorProxy(scrollingCoordinator)
{
}

RemoteScrollingTree::~RemoteScrollingTree()
{
}

ScrollingTree::EventResult RemoteScrollingTree::tryToHandleWheelEvent(const PlatformWheelEvent& wheelEvent)
{
    if (shouldHandleWheelEventSynchronously(wheelEvent))
        return SendToMainThread;

    if (willWheelEventStartSwipeGesture(wheelEvent))
        return DidNotHandleEvent;

    handleWheelEvent(wheelEvent);
    return DidHandleEvent;
}

#if PLATFORM(MAC) && !PLATFORM(IOS)
void RemoteScrollingTree::handleWheelEventPhase(PlatformWheelEventPhase phase)
{
    // FIXME: hand off to m_scrollingCoordinatorProxy?
}
#endif

void RemoteScrollingTree::scrollingTreeNodeDidScroll(ScrollingNodeID nodeID, const FloatPoint& scrollPosition, SetOrSyncScrollingLayerPosition)
{
    m_scrollingCoordinatorProxy.scrollPositionChanged(nodeID, scrollPosition);
}

PassOwnPtr<ScrollingTreeNode> RemoteScrollingTree::createNode(ScrollingNodeType nodeType, ScrollingNodeID nodeID)
{
    switch (nodeType) {
    case ScrollingNode:
#if PLATFORM(IOS)
        return ScrollingTreeScrollingNodeIOS::create(*this, nodeID);
#else
        return ScrollingTreeScrollingNodeMac::create(*this, nodeID);
#endif
    case FixedNode:
        return ScrollingTreeFixedNode::create(*this, nodeID);
    case StickyNode:
        return ScrollingTreeStickyNode::create(*this, nodeID);
    }
    return nullptr;
}

} // namespace WebKit

#endif // ENABLE(ASYNC_SCROLLING)