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      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_
     68