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      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/gtest_prod_util.h"
     13 #include "base/lazy_instance.h"
     14 #include "base/memory/scoped_ptr.h"
     15 #include "base/memory/weak_ptr.h"
     16 #include "base/strings/string16.h"
     17 #include "content/public/browser/notification_observer.h"
     18 #include "content/public/browser/notification_registrar.h"
     19 #include "content/public/browser/notification_types.h"
     20 
     21 class Profile;
     22 
     23 namespace base {
     24 class ListValue;
     25 }
     26 
     27 namespace chromeos {
     28 
     29 // Performs check whether locale has been changed automatically recently
     30 // (based on synchronized user preference).  If so: shows notification that
     31 // allows user to revert change.
     32 class LocaleChangeGuard : public content::NotificationObserver,
     33                           public ash::LocaleObserver::Delegate,
     34                           public base::SupportsWeakPtr<LocaleChangeGuard> {
     35  public:
     36   explicit LocaleChangeGuard(Profile* profile);
     37   virtual ~LocaleChangeGuard();
     38 
     39   // ash::LocaleChangeDelegate implementation.
     40   virtual void AcceptLocaleChange() OVERRIDE;
     41   virtual void RevertLocaleChange() OVERRIDE;
     42 
     43   // Called just before changing locale.
     44   void PrepareChangingLocale(
     45       const std::string& from_locale, const std::string& to_locale);
     46 
     47   // Called after login.
     48   void OnLogin();
     49 
     50  private:
     51   FRIEND_TEST_ALL_PREFIXES(LocaleChangeGuardTest,
     52                            ShowNotificationLocaleChanged);
     53   FRIEND_TEST_ALL_PREFIXES(LocaleChangeGuardTest,
     54                            ShowNotificationLocaleChangedList);
     55 
     56   void RevertLocaleChangeCallback(const base::ListValue* list);
     57   void Check();
     58 
     59   // content::NotificationObserver implementation.
     60   virtual void Observe(int type,
     61                        const content::NotificationSource& source,
     62                        const content::NotificationDetails& details) OVERRIDE;
     63 
     64   // Returns true if we should notify user about automatic locale change.
     65   static bool ShouldShowLocaleChangeNotification(const std::string& from_locale,
     66                                                  const std::string& to_locale);
     67 
     68   static const char* const* GetSkipShowNotificationLanguagesForTesting();
     69   static size_t GetSkipShowNotificationLanguagesSizeForTesting();
     70 
     71   std::string from_locale_;
     72   std::string to_locale_;
     73   Profile* profile_;
     74   bool reverted_;
     75   bool session_started_;
     76   bool main_frame_loaded_;
     77   content::NotificationRegistrar registrar_;
     78 
     79   // We want to show locale change notification in previous language however
     80   // we cannot directly load strings for non-current locale.  So we cache
     81   // messages before locale change.
     82   base::string16 title_text_;
     83   base::string16 message_text_;
     84   base::string16 revert_link_text_;
     85 };
     86 
     87 }  // namespace chromeos
     88 
     89 #endif  // CHROME_BROWSER_CHROMEOS_LOCALE_CHANGE_GUARD_H_
     90