athena/system/orientation_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 ATHENA_SYSTEM_ORIENTATION_CONTROLLER_H_
   6 #define ATHENA_SYSTEM_ORIENTATION_CONTROLLER_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "chromeos/accelerometer/accelerometer_reader.h"
  13 #include "ui/gfx/display.h"
  14
  15 namespace base {
  16 class TaskRunner;
  17 }
  18
  19 namespace athena {
  20
  21 // Monitors accelerometers, detecting orientation changes. When a change is
  22 // detected rotates the root window to match.
  23 class OrientationController
  24     : public chromeos::AccelerometerReader::Delegate {
  25  public:
  26   OrientationController();
  27   virtual ~OrientationController();
  28
  29   void InitWith(scoped_refptr<base::TaskRunner> blocking_task_runner);
  30   void Shutdown();
  31
  32   // chromeos::AccelerometerReader::Delegate
  33   virtual void HandleAccelerometerUpdate(
  34       const ui::AccelerometerUpdate& update) OVERRIDE;
  35
  36  private:
  37   // The last configured rotation.
  38   gfx::Display::Rotation current_rotation_;
  39
  40   scoped_ptr<chromeos::AccelerometerReader> accelerometer_reader_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(OrientationController);
  43 };
  44
  45 }  // namespace athena
  46
  47 #endif  // ATHENA_SYSTEM_ORIENTATION_CONTROLLER_H_