ash/ash_touch_exploration_manager_chromeos.h

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ASH_TOUCH_EXPLORATION_MANAGER_CHROMEOS_H_
#define ASH_TOUCH_EXPLORATION_MANAGER_CHROMEOS_H_

#include "ash/ash_export.h"
#include "ash/system/tray_accessibility.h"
#include "ui/chromeos/touch_exploration_controller.h"

namespace chromeos {
class CrasAudioHandler;
}

namespace ash {
class RootWindowController;

// Responsible for initializing TouchExplorationController when spoken
// feedback is on for ChromeOS only. This class implements
// TouchExplorationControllerDelegate which allows touch gestures to manipulate
// the system.
class ASH_EXPORT AshTouchExplorationManager
    : public ash::AccessibilityObserver,
      public ui::TouchExplorationControllerDelegate {
 public:
  explicit AshTouchExplorationManager(
      RootWindowController* root_window_controller);
  virtual ~AshTouchExplorationManager();

  // AccessibilityObserver overrides:
  virtual void OnAccessibilityModeChanged(
      AccessibilityNotificationVisibility notify) OVERRIDE;

  // TouchExplorationControllerDelegate overrides:
  virtual void SetOutputLevel(int volume) OVERRIDE;
  virtual void SilenceSpokenFeedback() OVERRIDE;
  virtual void PlayVolumeAdjustEarcon() OVERRIDE;
  virtual void PlayPassthroughEarcon() OVERRIDE;
  virtual void PlayExitScreenEarcon() OVERRIDE;
  virtual void PlayEnterScreenEarcon() OVERRIDE;

 private:
  void UpdateTouchExplorationState();
  bool VolumeAdjustSoundEnabled();

  scoped_ptr<ui::TouchExplorationController> touch_exploration_controller_;
  RootWindowController* root_window_controller_;
  chromeos::CrasAudioHandler* audio_handler_;

  DISALLOW_COPY_AND_ASSIGN(AshTouchExplorationManager);
};

}  // namespace ash

#endif  // ASH_TOUCH_EXPLORATION_MANAGER_CHROMEOS_H_