1 /*
2  * Copyright 2010, The Android Open Source Project
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 DeviceOrientationController_h
27 #define DeviceOrientationController_h
28 
29 #include "DOMWindow.h"
30 #include "Timer.h"
31 
32 #include <wtf/HashCountedSet.h>
33 
34 namespace WebCore {
35 
36 class DeviceOrientation;
37 class DeviceOrientationClient;
38 class Page;
39 
40 class DeviceOrientationController {
41 public:
42     DeviceOrientationController(Page*, DeviceOrientationClient*);
43     ~DeviceOrientationController();
44 
45     void addListener(DOMWindow*);
46     void removeListener(DOMWindow*);
47     void removeAllListeners(DOMWindow*);
48 
49     void didChangeDeviceOrientation(DeviceOrientation*);
50 
isActive()51     bool isActive() { return !m_listeners.isEmpty(); }
52 
53 private:
54     void timerFired(Timer<DeviceOrientationController>*);
55 
56     Page* m_page;
57     DeviceOrientationClient* m_client;
58     typedef HashCountedSet<RefPtr<DOMWindow> > ListenersCountedSet;
59     ListenersCountedSet m_listeners;
60     typedef HashSet<RefPtr<DOMWindow> > ListenersSet;
61     ListenersSet m_newListeners;
62     Timer<DeviceOrientationController> m_timer;
63 };
64 
65 } // namespace WebCore
66 
67 #endif // DeviceOrientationController_h
68