accelerometer_controller.h revision 1320f92c476a1ad9d19dba2a48c72b75566198e9 
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 ASH_ACCELEROMETER_ACCELEROMETER_CONTROLLER_H_
6#define ASH_ACCELEROMETER_ACCELEROMETER_CONTROLLER_H_
7
8#include "ash/ash_export.h"
9#include "base/memory/ref_counted.h"
10#include "base/memory/scoped_ptr.h"
11#include "base/observer_list.h"
12
13#if defined(OS_CHROMEOS)
14#include "chromeos/accelerometer/accelerometer_reader.h"
15#endif
16
17namespace base {
18class TaskRunner;
19}
20
21namespace ash {
22
23class AccelerometerObserver;
24
25// This class owns the communication interface for talking to the accelerometer
26// on supporting devices. Observers will be delivered OnAccelerometerRead
27// notifications if an accelerometer was detected.
28class ASH_EXPORT AccelerometerController
29#if defined(OS_CHROMEOS)
30    : public chromeos::AccelerometerReader::Delegate {
31#else
32    {
33#endif
34 public:
35  AccelerometerController();
36  virtual ~AccelerometerController();
37
38  // Initialize the accelerometer reader.
39  void Initialize(scoped_refptr<base::TaskRunner> blocking_task_runner);
40
41  // Add/remove observer.
42  void AddObserver(AccelerometerObserver* observer);
43  void RemoveObserver(AccelerometerObserver* observer);
44
45#if defined(OS_CHROMEOS)
46  // This needs to be CHROMEOS only as on other platforms it does not actually
47  // override a method.
48  // chromeos::AccelerometerReader::Delegate:
49  virtual void HandleAccelerometerUpdate(
50      const ui::AccelerometerUpdate& update) OVERRIDE;
51#endif
52
53 private:
54#if defined(OS_CHROMEOS)
55  // The AccelerometerReader which directly triggers and reads from the
56  // accelerometer device.
57  scoped_ptr<chromeos::AccelerometerReader> reader_;
58#endif
59
60  ObserverList<AccelerometerObserver, true> observers_;
61
62  DISALLOW_COPY_AND_ASSIGN(AccelerometerController);
63};
64
65}  // namespace ash
66
67#endif  // ASH_ACCELEROMETER_ACCELEROMETER_CONTROLLER_H_
68