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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_
#define CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "chromeos/accelerometer/accelerometer_reader.h"
#include "chromeos/accelerometer/accelerometer_types.h"
#include "content/common/content_export.h"
#include "content/common/device_sensors/device_motion_hardware_buffer.h"
#include "content/common/device_sensors/device_orientation_hardware_buffer.h"
namespace content {
// Observes Chrome OS accelerometer sensors, and provides updated device
// orientation information.
class CONTENT_EXPORT SensorManagerChromeOS
: public chromeos::AccelerometerReader::Observer {
public:
SensorManagerChromeOS();
~SensorManagerChromeOS() override;
// Begins monitoring of motion events, the shared memory of |buffer| will be
// updated upon subsequent events.
void StartFetchingDeviceMotionData(DeviceMotionHardwareBuffer* buffer);
// Stops monitoring motion events. Returns true if there is an active
// |motion_buffer_| and fetching stops. Otherwise returns false.
bool StopFetchingDeviceMotionData();
// Begins monitoring of orientation events, the shared memory of |buffer| will
// be updated upon subsequent events.
void StartFetchingDeviceOrientationData(
DeviceOrientationHardwareBuffer* buffer);
// Stops monitoring orientation events. Returns true if there is an active
// |orientation_buffer_| and fetching stops. Otherwise returns false.
bool StopFetchingDeviceOrientationData();
// chromeos::AccelerometerReader::Observer:
void OnAccelerometerUpdated(
scoped_refptr<const chromeos::AccelerometerUpdate> update) override;
protected:
// Begins/ends the observation of accelerometer events.
virtual void StartObservingAccelerometer();
virtual void StopObservingAccelerometer();
private:
// Updates |motion_buffer_| or |orientation_buffer_| accordingly.
void GenerateMotionEvent(double x, double y, double z);
void GenerateOrientationEvent(double x, double y, double z);
// Shared memory to update.
DeviceMotionHardwareBuffer* motion_buffer_;
DeviceOrientationHardwareBuffer* orientation_buffer_;
// Verify all work is done on the same thread.
base::ThreadChecker thread_checker_;
DISALLOW_COPY_AND_ASSIGN(SensorManagerChromeOS);
};
} // namespace content
#endif // CONTENT_BROWSER_DEVICE_SENSORS_SENSOR_MANAGER_CHROMEOS_H_
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