Remove dependency on NotificationService for cros a11y settings.

chrome/browser/chromeos/accessibility/accessibility_manager.h

 // Copyright (c) 2013 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 CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_
 
 #include <set>
 
 #include "ash/accessibility_delegate.h"
 #include "ash/session_state_observer.h"
+#include "base/callback_list.h"
 #include "base/memory/weak_ptr.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_util.h"
 #include "chrome/browser/extensions/api/braille_display_private/braille_controller.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/extension_system.h"
 
 namespace content {
 class RenderViewHost;
 }
 class Profile;
 
 namespace chromeos {
 
+enum AccessibilityNotificationType {
+  ACCESSIBILITY_NOTIFICATION_NONE,
+  ACCESSIBILITY_MANAGER_SHUTDOWN,
+  ACCESSIBILITY_TOGGLE_HIGH_CONTRAST_MODE,
+  ACCESSIBILITY_TOGGLE_LARGE_CURSOR,
+  ACCESSIBILITY_TOGGLE_SCREEN_MAGNIFIER,
+  ACCESSIBILITY_TOGGLE_SPOKEN_FEEDBACK,
+  ACCESSIBILITY_TOGGLE_VIRTUAL_KEYBOARD
+};
+
 struct AccessibilityStatusEventDetails {
   AccessibilityStatusEventDetails(
+      AccessibilityNotificationType notification_type,
       bool enabled,
       ash::AccessibilityNotificationVisibility notify);
 
   AccessibilityStatusEventDetails(
+      AccessibilityNotificationType notification_type,
       bool enabled,
       ash::MagnifierType magnifier_type,
       ash::AccessibilityNotificationVisibility notify);
 
+  AccessibilityNotificationType notification_type;
   bool enabled;
   ash::MagnifierType magnifier_type;
   ash::AccessibilityNotificationVisibility notify;
 };
 
+typedef base::Callback<void(const AccessibilityStatusEventDetails&)>
+    AccessibilityStatusCallback;
+
+typedef base::CallbackList<void(const AccessibilityStatusEventDetails&)>
+    AccessibilityStatusCallbackList;
+
+typedef AccessibilityStatusCallbackList::Subscription
+    AccessibilityStatusSubscription;
+
 // AccessibilityManager changes the statuses of accessibility features
 // watching profile notifications and pref-changes.
 // TODO(yoshiki): merge MagnificationManager with AccessibilityManager.
 class AccessibilityManager : public content::NotificationObserver,
     extensions::api::braille_display_private::BrailleObserver,
     public ash::SessionStateObserver {
  public:
   // Creates an instance of AccessibilityManager, this should be called once,
   // because only one instance should exist at the same time.
   static void Initialize();
@@ skipping 83 matching lines @@
 
   // Enables/disables system sounds.
   void EnableSystemSounds(bool system_sounds_enabled);
 
   // Initiates play of shutdown sound and returns it's duration.
   base::TimeDelta PlayShutdownSound();
 
   // Injects ChromeVox scripts into given |render_view_host|.
   void InjectChromeVox(content::RenderViewHost* render_view_host);
 
+  // Register a callback to be notified when the status of an accessibility
+  // option changes.
+  scoped_ptr<AccessibilityStatusSubscription> RegisterCallback(
+      const AccessibilityStatusCallback& cb);
+
+  // Notify registered callbacks of a status change in an accessibility setting.
+  void NotifyAccessibilityStatusChanged(
+      AccessibilityStatusEventDetails& details);
+
  protected:
   AccessibilityManager();
   virtual ~AccessibilityManager();
 
  private:
   void LoadChromeVox();
   void LoadChromeVoxToUserScreen();
   void LoadChromeVoxToLockScreen();
   void UnloadChromeVox();
   void UnloadChromeVoxFromLockScreen();
   void PostLoadChromeVox(Profile* profile);
   void PostUnloadChromeVox(Profile* profile);
 
   void UpdateLargeCursorFromPref();
   void UpdateStickyKeysFromPref();
   void UpdateSpokenFeedbackFromPref();
   void UpdateHighContrastFromPref();
   void UpdateAutoclickFromPref();
   void UpdateAutoclickDelayFromPref();
   void UpdateVirtualKeyboardFromPref();
   void LocalePrefChanged();
 
   void CheckBrailleState();
   void ReceiveBrailleDisplayState(
       scoped_ptr<extensions::api::braille_display_private::DisplayState> state);
 
-
   void SetProfile(Profile* profile);
 
   void UpdateChromeOSAccessibilityHistograms();
 
   // content::NotificationObserver implementation:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // extensions::api::braille_display_private::BrailleObserver implementation.
@@ skipping 31 matching lines @@
   bool virtual_keyboard_enabled_;
 
   ash::AccessibilityNotificationVisibility spoken_feedback_notification_;
 
   base::WeakPtrFactory<AccessibilityManager> weak_ptr_factory_;
 
   bool should_speak_chrome_vox_announcements_on_user_screen_;
 
   bool system_sounds_enabled_;
 
+  AccessibilityStatusCallbackList callback_list_;
+
   DISALLOW_COPY_AND_ASSIGN(AccessibilityManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_