Home | History | Annotate | Download | only in device_orientation 
      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 
     39 namespace blink {
     40 
     41 class DeviceMotionController;
     42 class DeviceMotionData;
     43 class WebDeviceMotionData;
     44 
     45 // This class listens to device motion data and notifies all registered controllers.
     46 class DeviceMotionDispatcher FINAL : public PlatformEventDispatcher, public WebDeviceMotionListener {
     47 public:
     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 
     57 private:
     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