1 /*
2  * Copyright 2010 Apple 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
6  * are met:
7  *  * Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  *  * Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #ifndef DeviceMotionController_h
27 #define DeviceMotionController_h
28 
29 #include "DOMWindow.h"
30 #include "Timer.h"
31 #include <wtf/HashCountedSet.h>
32 
33 namespace WebCore {
34 
35 class DeviceMotionData;
36 class DeviceMotionClient;
37 
38 class DeviceMotionController {
39 public:
40     DeviceMotionController(DeviceMotionClient*);
41     ~DeviceMotionController();
42 
43     void addListener(DOMWindow*);
44     void removeListener(DOMWindow*);
45     void removeAllListeners(DOMWindow*);
46 
47     void didChangeDeviceMotion(DeviceMotionData*);
48 
isActive()49     bool isActive() { return !m_listeners.isEmpty(); }
50 
51 private:
52     void timerFired(Timer<DeviceMotionController>*);
53 
54     DeviceMotionClient* m_client;
55     typedef HashCountedSet<RefPtr<DOMWindow> > ListenersCountedSet;
56     ListenersCountedSet m_listeners;
57     typedef HashSet<RefPtr<DOMWindow> > ListenersSet;
58     ListenersSet m_newListeners;
59     Timer<DeviceMotionController> m_timer;
60 };
61 
62 } // namespace WebCore
63 
64 #endif // DeviceMotionController_h
65