chrome/browser/chromeos/locale_change_guard.h

   1 // Copyright (c) 2012 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_LOCALE_CHANGE_GUARD_H_
   6 #define CHROME_BROWSER_CHROMEOS_LOCALE_CHANGE_GUARD_H_
   7
   8 #include <string>
   9
  10 #include "ash/system/locale/locale_observer.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/string16.h"
  16 #include "content/public/browser/notification_observer.h"
  17 #include "content/public/browser/notification_registrar.h"
  18 #include "content/public/browser/notification_types.h"
  19
  20 class Profile;
  21
  22 namespace base {
  23 class ListValue;
  24 }
  25
  26 namespace chromeos {
  27
  28 // Performs check whether locale has been changed automatically recently
  29 // (based on synchronized user preference).  If so: shows notification that
  30 // allows user to revert change.
  31 class LocaleChangeGuard : public content::NotificationObserver,
  32                           public ash::LocaleObserver::Delegate,
  33                           public base::SupportsWeakPtr<LocaleChangeGuard> {
  34  public:
  35   explicit LocaleChangeGuard(Profile* profile);
  36   virtual ~LocaleChangeGuard();
  37
  38   // ash::LocaleChangeDelegate implementation.
  39   virtual void AcceptLocaleChange() OVERRIDE;
  40   virtual void RevertLocaleChange() OVERRIDE;
  41
  42   // Called just before changing locale.
  43   void PrepareChangingLocale(
  44       const std::string& from_locale, const std::string& to_locale);
  45
  46   // Called after login.
  47   void OnLogin();
  48
  49  private:
  50   class Delegate;
  51
  52   void RevertLocaleChangeCallback(const base::ListValue* list);
  53   void Check();
  54
  55   // content::NotificationObserver implementation.
  56   virtual void Observe(int type,
  57                        const content::NotificationSource& source,
  58                        const content::NotificationDetails& details) OVERRIDE;
  59
  60   std::string from_locale_;
  61   std::string to_locale_;
  62   Profile* profile_;
  63   bool reverted_;
  64   content::NotificationRegistrar registrar_;
  65
  66   // We want to show locale change notification in previous language however
  67   // we cannot directly load strings for non-current locale.  So we cache
  68   // messages before locale change.
  69   string16 title_text_;
  70   string16 message_text_;
  71   string16 revert_link_text_;
  72 };
  73
  74 }  // namespace chromeos
  75
  76 #endif  // CHROME_BROWSER_CHROMEOS_LOCALE_CHANGE_GUARD_H_