chrome/browser/chromeos/locale_change_guard.cc

   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 #include "chrome/browser/chromeos/locale_change_guard.h"
   6
   7 #include "ash/shell.h"
   8 #include "ash/system/tray/system_tray.h"
   9 #include "ash/system/tray/system_tray_notifier.h"
  10 #include "base/bind.h"
  11 #include "base/prefs/pref_service.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "chrome/app/chrome_command_ids.h"
  14 #include "chrome/browser/browser_process.h"
  15 #include "chrome/browser/chromeos/settings/device_settings_service.h"
  16 #include "chrome/browser/lifetime/application_lifetime.h"
  17 #include "chrome/browser/notifications/notification_delegate.h"
  18 #include "chrome/browser/profiles/profile.h"
  19 #include "chrome/browser/ui/browser.h"
  20 #include "chrome/browser/ui/browser_commands.h"
  21 #include "chrome/browser/ui/host_desktop.h"
  22 #include "chrome/common/chrome_notification_types.h"
  23 #include "chrome/common/pref_names.h"
  24 #include "content/public/browser/notification_service.h"
  25 #include "content/public/browser/notification_source.h"
  26 #include "content/public/browser/user_metrics.h"
  27 #include "content/public/browser/web_contents.h"
  28 #include "grit/generated_resources.h"
  29 #include "grit/theme_resources.h"
  30 #include "ui/base/l10n/l10n_util.h"
  31
  32 using content::UserMetricsAction;
  33 using content::WebContents;
  34
  35 namespace chromeos {
  36
  37 class LocaleChangeGuard::Delegate : public NotificationDelegate {
  38  public:
  39   explicit Delegate(chromeos::LocaleChangeGuard* master) : master_(master) {}
  40   virtual void Close(bool by_user) OVERRIDE;
  41   virtual void Display() OVERRIDE {}
  42   virtual void Error() OVERRIDE {}
  43   virtual void Click() OVERRIDE {}
  44   virtual std::string id() const OVERRIDE;
  45   virtual content::RenderViewHost* GetRenderViewHost() const OVERRIDE {
  46     return NULL;
  47   }
  48
  49  protected:
  50   virtual ~Delegate() {}
  51
  52  private:
  53   chromeos::LocaleChangeGuard* master_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(Delegate);
  56 };
  57
  58 LocaleChangeGuard::LocaleChangeGuard(Profile* profile)
  59     : profile_(profile),
  60       reverted_(false),
  61       session_started_(false),
  62       main_frame_loaded_(false) {
  63   DCHECK(profile_);
  64   registrar_.Add(this, chrome::NOTIFICATION_OWNERSHIP_STATUS_CHANGED,
  65                  content::NotificationService::AllSources());
  66 }
  67
  68 LocaleChangeGuard::~LocaleChangeGuard() {}
  69
  70 void LocaleChangeGuard::OnLogin() {
  71   registrar_.Add(this, chrome::NOTIFICATION_SESSION_STARTED,
  72                  content::NotificationService::AllSources());
  73   registrar_.Add(this, content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
  74                  content::NotificationService::AllBrowserContextsAndSources());
  75 }
  76
  77 void LocaleChangeGuard::RevertLocaleChange() {
  78   if (profile_ == NULL ||
  79       from_locale_.empty() ||
  80       to_locale_.empty()) {
  81     NOTREACHED();
  82     return;
  83   }
  84   if (reverted_)
  85     return;
  86   reverted_ = true;
  87   content::RecordAction(UserMetricsAction("LanguageChange_Revert"));
  88   profile_->ChangeAppLocale(
  89       from_locale_, Profile::APP_LOCALE_CHANGED_VIA_REVERT);
  90   chrome::AttemptUserExit();
  91 }
  92
  93 void LocaleChangeGuard::RevertLocaleChangeCallback(const ListValue* list) {
  94   RevertLocaleChange();
  95 }
  96
  97 void LocaleChangeGuard::Observe(int type,
  98                                 const content::NotificationSource& source,
  99                                 const content::NotificationDetails& details) {
 100   if (profile_ == NULL) {
 101     NOTREACHED();
 102     return;
 103   }
 104   switch (type) {
 105     case chrome::NOTIFICATION_SESSION_STARTED: {
 106       session_started_ = true;
 107       registrar_.Remove(this, chrome::NOTIFICATION_SESSION_STARTED,
 108                         content::NotificationService::AllSources());
 109       if (main_frame_loaded_)
 110         Check();
 111       break;
 112     }
 113     case content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME: {
 114       if (profile_ ==
 115           content::Source<WebContents>(source)->GetBrowserContext()) {
 116         main_frame_loaded_ = true;
 117         // We need to perform locale change check only once, so unsubscribe.
 118         registrar_.Remove(this, content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
 119                           content::NotificationService::AllSources());
 120         if (session_started_)
 121           Check();
 122       }
 123       break;
 124     }
 125     case chrome::NOTIFICATION_OWNERSHIP_STATUS_CHANGED: {
 126       if (DeviceSettingsService::Get()->HasPrivateOwnerKey()) {
 127         PrefService* local_state = g_browser_process->local_state();
 128         if (local_state) {
 129           PrefService* prefs = profile_->GetPrefs();
 130           if (prefs == NULL) {
 131             NOTREACHED();
 132             return;
 133           }
 134           std::string owner_locale =
 135               prefs->GetString(prefs::kApplicationLocale);
 136           if (!owner_locale.empty())
 137             local_state->SetString(prefs::kOwnerLocale, owner_locale);
 138         }
 139       }
 140       break;
 141     }
 142     default: {
 143       NOTREACHED();
 144       break;
 145     }
 146   }
 147 }
 148
 149 void LocaleChangeGuard::Check() {
 150   std::string cur_locale = g_browser_process->GetApplicationLocale();
 151   if (cur_locale.empty()) {
 152     NOTREACHED();
 153     return;
 154   }
 155
 156   PrefService* prefs = profile_->GetPrefs();
 157   if (prefs == NULL) {
 158     NOTREACHED();
 159     return;
 160   }
 161
 162   std::string to_locale = prefs->GetString(prefs::kApplicationLocale);
 163   if (to_locale != cur_locale) {
 164     // This conditional branch can occur in cases like:
 165     // (1) kApplicationLocale preference was modified by synchronization;
 166     // (2) kApplicationLocale is managed by policy.
 167     return;
 168   }
 169
 170   std::string from_locale = prefs->GetString(prefs::kApplicationLocaleBackup);
 171   if (from_locale.empty() || from_locale == to_locale)
 172     return;  // No locale change was detected, just exit.
 173
 174   if (prefs->GetString(prefs::kApplicationLocaleAccepted) == to_locale)
 175     return;  // Already accepted.
 176
 177   // Locale change detected, showing notification.
 178   if (from_locale_ != from_locale || to_locale_ != to_locale) {
 179     // Falling back to showing message in current locale.
 180     LOG(ERROR) <<
 181         "Showing locale change notification in current (not previous) language";
 182     PrepareChangingLocale(from_locale, to_locale);
 183   }
 184
 185   ash::Shell::GetInstance()->system_tray_notifier()->NotifyLocaleChanged(
 186       this, cur_locale, from_locale_, to_locale_);
 187 }
 188
 189 void LocaleChangeGuard::AcceptLocaleChange() {
 190   if (profile_ == NULL ||
 191       from_locale_.empty() ||
 192       to_locale_.empty()) {
 193     NOTREACHED();
 194     return;
 195   }
 196
 197   // Check whether locale has been reverted or changed.
 198   // If not: mark current locale as accepted.
 199   if (reverted_)
 200     return;
 201   PrefService* prefs = profile_->GetPrefs();
 202   if (prefs == NULL) {
 203     NOTREACHED();
 204     return;
 205   }
 206   if (prefs->GetString(prefs::kApplicationLocale) != to_locale_)
 207     return;
 208   content::RecordAction(UserMetricsAction("LanguageChange_Accept"));
 209   prefs->SetString(prefs::kApplicationLocaleBackup, to_locale_);
 210   prefs->SetString(prefs::kApplicationLocaleAccepted, to_locale_);
 211 }
 212
 213 void LocaleChangeGuard::PrepareChangingLocale(
 214     const std::string& from_locale, const std::string& to_locale) {
 215   std::string cur_locale = g_browser_process->GetApplicationLocale();
 216   if (!from_locale.empty())
 217     from_locale_ = from_locale;
 218   if (!to_locale.empty())
 219     to_locale_ = to_locale;
 220
 221   if (!from_locale_.empty() && !to_locale_.empty()) {
 222     string16 from = l10n_util::GetDisplayNameForLocale(
 223         from_locale_, cur_locale, true);
 224     string16 to = l10n_util::GetDisplayNameForLocale(
 225         to_locale_, cur_locale, true);
 226
 227     title_text_ = l10n_util::GetStringUTF16(
 228         IDS_OPTIONS_SETTINGS_SECTION_TITLE_LANGUAGE);
 229     message_text_ = l10n_util::GetStringFUTF16(
 230         IDS_LOCALE_CHANGE_MESSAGE, from, to);
 231     revert_link_text_ = l10n_util::GetStringFUTF16(
 232         IDS_LOCALE_CHANGE_REVERT_MESSAGE, from);
 233   }
 234 }
 235
 236 void LocaleChangeGuard::Delegate::Close(bool by_user) {
 237   if (by_user)
 238     master_->AcceptLocaleChange();
 239 }
 240
 241 std::string LocaleChangeGuard::Delegate::id() const {
 242   // Arbitrary unique Id.
 243   return "8c386938-1e3f-11e0-ac7b-18a90520e2e5";
 244 }
 245
 246 }  // namespace chromeos