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#ifndef DeviceMotionDispatcher_h
#define DeviceMotionDispatcher_h

#include "core/frame/PlatformEventDispatcher.h"
#include "platform/heap/Handle.h"
#include "public/platform/WebDeviceMotionListener.h"
#include "wtf/RefPtr.h"

namespace blink {

class DeviceMotionController;
class DeviceMotionData;
class WebDeviceMotionData;

// This class listens to device motion data and notifies all registered controllers.
class DeviceMotionDispatcher FINAL : public PlatformEventDispatcher, public WebDeviceMotionListener {
public:
    static DeviceMotionDispatcher& instance();

    // Note that the returned object is owned by this class.
    // FIXME: make the return value const, see crbug.com/233174.
    DeviceMotionData* latestDeviceMotionData();

    // Inherited from WebDeviceMotionListener.
    virtual void didChangeDeviceMotion(const WebDeviceMotionData&) OVERRIDE;

private:
    DeviceMotionDispatcher();
    virtual ~DeviceMotionDispatcher();

    // Inherited from PlatformEventDispatcher.
    virtual void startListening() OVERRIDE;
    virtual void stopListening() OVERRIDE;

    RefPtrWillBePersistent<DeviceMotionData> m_lastDeviceMotionData;
};

} // namespace blink

#endif // DeviceMotionDispatcher_h
