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      1 // Copyright (c) 2011 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 CHROME_BROWSER_CHROMEOS_LOGIN_WIZARD_ACCESSIBILITY_HELPER_H_
      6 #define CHROME_BROWSER_CHROMEOS_LOGIN_WIZARD_ACCESSIBILITY_HELPER_H_
      7 #pragma once
      8 
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/memory/singleton.h"
     11 #include "chrome/browser/chromeos/login/wizard_accessibility_handler.h"
     12 #include "content/common/notification_registrar.h"
     13 #include "ui/base/keycodes/keyboard_codes.h"
     14 
     15 class Profile;
     16 namespace views {
     17 class Accelerator;
     18 class View;
     19 }
     20 
     21 namespace chromeos {
     22 
     23 // Class that provides convenience methods to enable accessibility for a
     24 // specified View.
     25 class WizardAccessibilityHelper {
     26  public:
     27   // Get Singleton instance of WizardAccessibilityHelper.
     28   static WizardAccessibilityHelper* GetInstance();
     29 
     30   // Get accelerator for enabling accessibility.
     31   static views::Accelerator GetAccelerator();
     32 
     33   // Speak the given text if the accessibility pref is already set. |queue|
     34   // specifies whether this utterance will be queued or spoken immediately.
     35   // |interruptible| specified whether this utterance can be flushed by a
     36   // subsequent utterance.
     37   // TODO (chaitanyag): Change API to use string16 instead of char*.
     38   void MaybeSpeak(const char* str, bool queue, bool interruptible);
     39 
     40   // Unregisters all accessibility notifications
     41   void UnregisterNotifications();
     42 
     43   // Toggles accessibility support.
     44   void ToggleAccessibility();
     45 
     46   // Initialize accessibility
     47   void Init();
     48 
     49  private:
     50   friend struct DefaultSingletonTraits<WizardAccessibilityHelper>;
     51 
     52   WizardAccessibilityHelper();
     53 
     54   virtual ~WizardAccessibilityHelper() {}
     55 
     56   void RegisterNotifications();
     57 
     58   bool IsAccessibilityEnabled();
     59 
     60   void SetAccessibilityEnabled(bool);
     61 
     62   static scoped_ptr<views::Accelerator> accelerator_;
     63 
     64   scoped_ptr<WizardAccessibilityHandler> accessibility_handler_;
     65 
     66   Profile* profile_;
     67 
     68   // Used for tracking registrations to accessibility notifications.
     69   NotificationRegistrar registrar_;
     70 
     71   bool registered_notifications_;
     72 
     73   DISALLOW_COPY_AND_ASSIGN(WizardAccessibilityHelper);
     74 };
     75 
     76 }  // namespace chromeos
     77 
     78 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WIZARD_ACCESSIBILITY_HELPER_H_
     79