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      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
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      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
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     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
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     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 DeviceOrientationDispatcher_h
     32 #define DeviceOrientationDispatcher_h
     33 
     34 #include "modules/device_orientation/DeviceSensorEventDispatcher.h"
     35 #include "public/platform/WebDeviceOrientationListener.h"
     36 #include "wtf/RefPtr.h"
     37 
     38 namespace WebKit {
     39 class WebDeviceOrientationData;
     40 }
     41 
     42 namespace WebCore {
     43 
     44 class NewDeviceOrientationController;
     45 class DeviceOrientationData;
     46 
     47 // This class listens to device motion data and dispatches it to all
     48 // listening controllers.
     49 class DeviceOrientationDispatcher : public DeviceSensorEventDispatcher, public WebKit::WebDeviceOrientationListener {
     50 public:
     51     static DeviceOrientationDispatcher& instance();
     52 
     53     // Note that the returned object is owned by this class.
     54     // FIXME: make the return value const, see crbug.com/233174.
     55     DeviceOrientationData* latestDeviceOrientationData();
     56 
     57     // This method is called every time new device motion data is available.
     58     virtual void didChangeDeviceOrientation(const WebKit::WebDeviceOrientationData&) OVERRIDE;
     59     void addDeviceOrientationController(NewDeviceOrientationController*);
     60     void removeDeviceOrientationController(NewDeviceOrientationController*);
     61 
     62 private:
     63     DeviceOrientationDispatcher();
     64     ~DeviceOrientationDispatcher();
     65 
     66     virtual void startListening() OVERRIDE;
     67     virtual void stopListening() OVERRIDE;
     68 
     69     RefPtr<DeviceOrientationData> m_lastDeviceOrientationData;
     70 };
     71 
     72 } // namespace WebCore
     73 
     74 #endif // DeviceOrientationDispatcher_h
     75