Adjust ChromeVox (spoken feedback) strings and make it possible for announcemen

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 "ash/accessibility_delegate.h"
 #include "base/memory/weak_ptr.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_util.h"
 #include "chrome/browser/extensions/api/braille_display_private/braille_controller.h"
+#include "chrome/browser/extensions/event_router.h"
+#include "chrome/browser/extensions/extension_system.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
 namespace chromeos {
 
 struct AccessibilityStatusEventDetails {
   AccessibilityStatusEventDetails(
       bool enabled,
       ash::AccessibilityNotificationVisibility notify);
 
   AccessibilityStatusEventDetails(
       bool enabled,
       ash::MagnifierType magnifier_type,
       ash::AccessibilityNotificationVisibility notify);
 
   bool enabled;
   ash::MagnifierType magnifier_type;
   ash::AccessibilityNotificationVisibility notify;
 };
 
 // AccessibilityManager changes the statuses of accessibility features
 // watching profile notifications and pref-changes.
 // TODO(yoshiki): merge MagnificationManager with AccessibilityManager.
 class AccessibilityManager : public content::NotificationObserver,
+    public extensions::EventRouter::Observer,
     extensions::api::braille_display_private::BrailleObserver {
  public:
   // Creates an instance of AccessibilityManager, this should be called once,
   // because only one instance should exist at the same time.
   static void Initialize();
   // Deletes the existing instance of AccessibilityManager.
   static void Shutdown();
   // Returns the existing instance. If there is no instance, returns NULL.
   static AccessibilityManager* Get();
 
@@ skipping 100 matching lines @@
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // extensions::api::braille_display_private::BrailleObserver implementation.
   // Enables spoken feedback if a braille display becomes available.
   virtual void OnDisplayStateChanged(
       const extensions::api::braille_display_private::DisplayState&
           display_state) OVERRIDE;
 
+  // EventRouter::Observer implementation.
+  virtual void OnListenerAdded(
+      const extensions::EventListenerInfo& details) OVERRIDE;
+  virtual void OnListenerRemoved(
+      const extensions::EventListenerInfo& details) OVERRIDE;
+
   // Profile which has the current a11y context.
   Profile* profile_;
 
   // Profile which ChromeVox is currently loaded to. If NULL, ChromeVox is not
   // loaded to any profile.
   bool chrome_vox_loaded_on_lock_screen_;
   bool chrome_vox_loaded_on_user_screen_;
 
   content::NotificationRegistrar notification_registrar_;
   scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
   scoped_ptr<PrefChangeRegistrar> local_state_pref_change_registrar_;
 
   PrefHandler large_cursor_pref_handler_;
   PrefHandler spoken_feedback_pref_handler_;
   PrefHandler high_contrast_pref_handler_;
   PrefHandler autoclick_pref_handler_;
   PrefHandler autoclick_delay_pref_handler_;
 
   bool large_cursor_enabled_;
   bool sticky_keys_enabled_;
   bool spoken_feedback_enabled_;
   bool high_contrast_enabled_;
   bool autoclick_enabled_;
   int autoclick_delay_ms_;
 
   ash::AccessibilityNotificationVisibility spoken_feedback_notification_;
 
   base::WeakPtrFactory<AccessibilityManager> weak_ptr_factory_;
 
+  bool should_speak_chrome_vox_announcements_on_user_screen_;
+
   DISALLOW_COPY_AND_ASSIGN(AccessibilityManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_