ash/accelerometer/accelerometer_controller.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 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
  17 namespace base {
  18 class TaskRunner;
  19 }
  20
  21 namespace ash {
  22
  23 class 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.
  28 class 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_