1/*
2 * Copyright (C) 2013 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef DeviceMotionDispatcher_h
32#define DeviceMotionDispatcher_h
33
34#include "core/frame/PlatformEventDispatcher.h"
35#include "platform/heap/Handle.h"
36#include "public/platform/WebDeviceMotionListener.h"
37#include "wtf/RefPtr.h"
38
39namespace blink {
40
41class DeviceMotionController;
42class DeviceMotionData;
43class WebDeviceMotionData;
44
45// This class listens to device motion data and notifies all registered controllers.
46class DeviceMotionDispatcher FINAL : public PlatformEventDispatcher, public WebDeviceMotionListener {
47public:
48    static DeviceMotionDispatcher& instance();
49
50    // Note that the returned object is owned by this class.
51    // FIXME: make the return value const, see crbug.com/233174.
52    DeviceMotionData* latestDeviceMotionData();
53
54    // Inherited from WebDeviceMotionListener.
55    virtual void didChangeDeviceMotion(const WebDeviceMotionData&) OVERRIDE;
56
57private:
58    DeviceMotionDispatcher();
59    virtual ~DeviceMotionDispatcher();
60
61    // Inherited from PlatformEventDispatcher.
62    virtual void startListening() OVERRIDE;
63    virtual void stopListening() OVERRIDE;
64
65    Persistent<DeviceMotionData> m_lastDeviceMotionData;
66};
67
68} // namespace blink
69
70#endif // DeviceMotionDispatcher_h
71