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