/*
 * 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.
 */

#ifndef RemoteScrollingCoordinatorProxy_h
#define RemoteScrollingCoordinatorProxy_h

#if ENABLE(ASYNC_SCROLLING)

#include "MessageReceiver.h"
#include "RemoteScrollingCoordinator.h"
#include <wtf/Noncopyable.h>
#include <wtf/RefPtr.h>

namespace WebCore {
class FloatPoint;
class PlatformWheelEvent;
}

namespace WebKit {

class RemoteLayerTreeHost;
class RemoteScrollingCoordinatorTransaction;
class RemoteScrollingTree;
class WebPageProxy;

class RemoteScrollingCoordinatorProxy {
    WTF_MAKE_NONCOPYABLE(RemoteScrollingCoordinatorProxy);
public:
    explicit RemoteScrollingCoordinatorProxy(WebPageProxy&);
    virtual ~RemoteScrollingCoordinatorProxy();
    
    // Inform the web process that the scroll position changed (called from the scrolling tree)
    void scrollPositionChanged(WebCore::ScrollingNodeID, const WebCore::FloatPoint& newScrollPosition);

    // Called externally when native views move around.
    void scrollPositionChangedViaDelegatedScrolling(WebCore::ScrollingNodeID, const WebCore::IntPoint&);

    // FIXME: expose the tree and pass this to that?
    bool handleWheelEvent(const WebCore::PlatformWheelEvent&);
    
    WebCore::ScrollingNodeID rootScrollingNodeID() const;

    const RemoteLayerTreeHost* layerTreeHost() const;

    void updateScrollingTree(const RemoteScrollingCoordinatorTransaction&);

private:
    void connectStateNodeLayers(WebCore::ScrollingStateTree&, const RemoteLayerTreeHost&);

    WebPageProxy& m_webPageProxy;
    RefPtr<RemoteScrollingTree> m_scrollingTree;
};

} // namespace WebKit

#endif // ENABLE(ASYNC_SCROLLING)

#endif // RemoteScrollingCoordinatorProxy_h