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// Copyright 2014 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 ASH_ACCELEROMETER_ACCELEROMETER_CONTROLLER_H_
#define ASH_ACCELEROMETER_ACCELEROMETER_CONTROLLER_H_
#include "ash/ash_export.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#if defined(OS_CHROMEOS)
#include "chromeos/accelerometer/accelerometer_reader.h"
#endif
namespace base {
class TaskRunner;
}
namespace ash {
class AccelerometerObserver;
// This class owns the communication interface for talking to the accelerometer
// on supporting devices. Observers will be delivered OnAccelerometerRead
// notifications if an accelerometer was detected.
class ASH_EXPORT AccelerometerController
#if defined(OS_CHROMEOS)
: public chromeos::AccelerometerReader::Delegate {
#else
{
#endif
public:
AccelerometerController();
virtual ~AccelerometerController();
// Initialize the accelerometer reader.
void Initialize(scoped_refptr<base::TaskRunner> blocking_task_runner);
// Add/remove observer.
void AddObserver(AccelerometerObserver* observer);
void RemoveObserver(AccelerometerObserver* observer);
#if defined(OS_CHROMEOS)
// This needs to be CHROMEOS only as on other platforms it does not actually
// override a method.
// chromeos::AccelerometerReader::Delegate:
virtual void HandleAccelerometerUpdate(
const ui::AccelerometerUpdate& update) OVERRIDE;
#endif
private:
#if defined(OS_CHROMEOS)
// The AccelerometerReader which directly triggers and reads from the
// accelerometer device.
scoped_ptr<chromeos::AccelerometerReader> reader_;
#endif
ObserverList<AccelerometerObserver, true> observers_;
DISALLOW_COPY_AND_ASSIGN(AccelerometerController);
};
} // namespace ash
#endif // ASH_ACCELEROMETER_ACCELEROMETER_CONTROLLER_H_
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