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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_
      6 #define CONTENT_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_
      7 
      8 #include "base/memory/scoped_ptr.h"
      9 #include "content/renderer/device_orientation/device_sensor_event_pump.h"
     10 #include "content/renderer/shared_memory_seqlock_reader.h"
     11 #include "third_party/WebKit/public/platform/WebDeviceMotionData.h"
     12 
     13 namespace WebKit {
     14 class WebDeviceMotionListener;
     15 }
     16 
     17 namespace content {
     18 
     19 typedef SharedMemorySeqLockReader<WebKit::WebDeviceMotionData>
     20     DeviceMotionSharedMemoryReader;
     21 
     22 class CONTENT_EXPORT DeviceMotionEventPump : public DeviceSensorEventPump {
     23  public:
     24   DeviceMotionEventPump();
     25   explicit DeviceMotionEventPump(int pump_delay_millis);
     26   virtual ~DeviceMotionEventPump();
     27 
     28   // Sets the listener to receive updates for device motion data at
     29   // regular intervals. Returns true if the registration was successful.
     30   bool SetListener(WebKit::WebDeviceMotionListener* listener);
     31 
     32   // RenderProcessObserver implementation.
     33   virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
     34 
     35  protected:
     36   virtual void FireEvent() OVERRIDE;
     37   virtual bool InitializeReader(base::SharedMemoryHandle handle) OVERRIDE;
     38   virtual bool SendStartMessage() OVERRIDE;
     39   virtual bool SendStopMessage() OVERRIDE;
     40 
     41   WebKit::WebDeviceMotionListener* listener_;
     42   scoped_ptr<DeviceMotionSharedMemoryReader> reader_;
     43 };
     44 
     45 }  // namespace content
     46 
     47 #endif  // CONTENT_RENDERER_DEVICE_MOTION_EVENT_PUMP_H_
     48