content/browser/device_sensors/sensor_manager_chromeos.h

   1 // Copyright 2015 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_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_
   6 #define CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_
   7
   8 #include "base/macros.h"
   9 #include "base/threading/thread_checker.h"
  10 #include "chromeos/accelerometer/accelerometer_reader.h"
  11 #include "chromeos/accelerometer/accelerometer_types.h"
  12 #include "content/common/content_export.h"
  13 #include "content/common/device_sensors/device_motion_hardware_buffer.h"
  14 #include "content/common/device_sensors/device_orientation_hardware_buffer.h"
  15
  16 namespace content {
  17
  18 // Observes Chrome OS accelerometer sensors, and provides updated device
  19 // orientation information.
  20 class CONTENT_EXPORT SensorManagerChromeOS
  21     : public chromeos::AccelerometerReader::Observer {
  22  public:
  23   SensorManagerChromeOS();
  24   ~SensorManagerChromeOS() override;
  25
  26   // Begins monitoring of motion events, the shared memory of |buffer| will be
  27   // updated upon subsequent events.
  28   void StartFetchingDeviceMotionData(DeviceMotionHardwareBuffer* buffer);
  29
  30   // Stops monitoring motion events. Returns true if there is an active
  31   // |motion_buffer_| and fetching stops. Otherwise returns false.
  32   bool StopFetchingDeviceMotionData();
  33
  34   // Begins monitoring of orientation events, the shared memory of |buffer| will
  35   // be updated upon subsequent events.
  36   void StartFetchingDeviceOrientationData(
  37       DeviceOrientationHardwareBuffer* buffer);
  38
  39   // Stops monitoring orientation events. Returns true if there is an active
  40   // |orientation_buffer_| and fetching stops. Otherwise returns false.
  41   bool StopFetchingDeviceOrientationData();
  42
  43   // chromeos::AccelerometerReader::Observer:
  44   void OnAccelerometerUpdated(
  45       scoped_refptr<const chromeos::AccelerometerUpdate> update) override;
  46
  47  protected:
  48   // Begins/ends the observation of accelerometer events.
  49   virtual void StartObservingAccelerometer();
  50   virtual void StopObservingAccelerometer();
  51
  52  private:
  53   // Updates |motion_buffer_| or |orientation_buffer_| accordingly.
  54   void GenerateMotionEvent(double x, double y, double z);
  55   void GenerateOrientationEvent(double x, double y, double z);
  56
  57   // Shared memory to update.
  58   DeviceMotionHardwareBuffer* motion_buffer_;
  59   DeviceOrientationHardwareBuffer* orientation_buffer_;
  60
  61   // Verify all work is done on the same thread.
  62   base::ThreadChecker thread_checker_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(SensorManagerChromeOS);
  65 };
  66
  67 }  // namespace content
  68
  69 #endif  // CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_