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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 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_
     72