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 gfx {
  22 class Vector3dF;
  23 }
  24
  25 namespace ash {
  26
  27 class AccelerometerObserver;
  28
  29 // This class owns the communication interface for talking to the accelerometer
  30 // on supporting devices. Observers will be delivered OnAccelerometerRead
  31 // notifications if an accelerometer was detected.
  32 class ASH_EXPORT AccelerometerController
  33 #if defined(OS_CHROMEOS)
  34     : public chromeos::AccelerometerReader::Delegate {
  35 #else
  36     {
  37 #endif
  38  public:
  39   AccelerometerController();
  40   virtual ~AccelerometerController();
  41
  42   // Initialize the accelerometer reader.
  43   void Initialize(scoped_refptr<base::TaskRunner> blocking_task_runner);
  44
  45   // Add/remove observer.
  46   void AddObserver(AccelerometerObserver* observer);
  47   void RemoveObserver(AccelerometerObserver* observer);
  48
  49 #if defined(OS_CHROMEOS)
  50   // This needs to be CHROMEOS only as on other platforms it does not actually
  51   // override a method.
  52   // chromeos::AccelerometerReader::Delegate:
  53   virtual void HandleAccelerometerReading(const gfx::Vector3dF& base,
  54                                           const gfx::Vector3dF& lid) OVERRIDE;
  55 #endif
  56
  57  private:
  58 #if defined(OS_CHROMEOS)
  59   // The AccelerometerReader which directly triggers and reads from the
  60   // accelerometer device.
  61   scoped_ptr<chromeos::AccelerometerReader> reader_;
  62 #endif
  63
  64   ObserverList<AccelerometerObserver, true> observers_;
  65
  66   DISALLOW_COPY_AND_ASSIGN(AccelerometerController);
  67 };
  68
  69 }  // namespace ash
  70
  71 #endif  // ASH_ACCELEROMETER_ACCELEROMETER_CONTROLLER_H_