content/renderer/device_sensors/device_motion_event_pump.h

   1 // Copyright 2014 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_SENSORS_DEVICE_MOTION_EVENT_PUMP_H_
   6 #define CONTENT_RENDERER_DEVICE_SENSORS_DEVICE_MOTION_EVENT_PUMP_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "content/renderer/device_sensors/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 blink {
  14 class WebDeviceMotionListener;
  15 }
  16
  17 namespace content {
  18
  19 typedef SharedMemorySeqLockReader<blink::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(blink::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   blink::WebDeviceMotionListener* listener_;
  42   scoped_ptr<DeviceMotionSharedMemoryReader> reader_;
  43 };
  44
  45 }  // namespace content
  46
  47 #endif  // CONTENT_RENDERER_DEVICE_SENSORS_DEVICE_MOTION_EVENT_PUMP_H_