Side Slide Gestures for Accessibility

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.

[dmazzoni, 2014/07/16 16:54:39]

I'd also say that this class implements the TouchExplorationControllerDelegate,
allowing touch gestures to manipulate the system.

[lisayin, 2014/07/17 16:56:17]

Done.

+class ASH_EXPORT AshTouchExplorationManagerChromeOS

[dmazzoni, 2014/07/16 16:54:39]

Optional: I think it's fine to call this class AshTouchExplorationManager and
just say "for Chrome OS only" in the comment above. We don't normally put
"ChromeOS" in the name of classes unless there's a specific subclass for
multiple operating systems.

Normally the filename and class name should match exactly, but an
operating-system prefix on the end of the filename is a common exception.

[lisayin, 2014/07/17 16:56:17]

Done.

+    : public ash::AccessibilityObserver,
+      public ui::TouchExplorationControllerDelegate {
+ public:
+  explicit AshTouchExplorationManagerChromeOS(
+      RootWindowController* root_window_controller);
+  virtual ~AshTouchExplorationManagerChromeOS();
+
+  // AccessibilityObserver overrides:
+  virtual void OnAccessibilityModeChanged(
+      AccessibilityNotificationVisibility notify) OVERRIDE;
+
+  // TouchExplorationControllerDelegate overrides:
+  virtual void PlayVolumeAdjustSound() OVERRIDE;
+  virtual void SetOutputLevel(float volume) 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(AshTouchExplorationManagerChromeOS);
+};
+
+}  // namespace ash
+
+#endif  // ASH_TOUCH_EXPLORATION_MANAGER_CHROMEOS_H_