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/utf_string_conversions.h"
  12 #include "chrome/app/chrome_command_ids.h"
  13 #include "chrome/browser/browser_process.h"
  14 #include "chrome/browser/chromeos/settings/device_settings_service.h"
  15 #include "chrome/browser/notifications/notification_delegate.h"
  16 #include "chrome/browser/prefs/pref_service.h"
  17 #include "chrome/browser/profiles/profile.h"
  18 #include "chrome/browser/ui/browser.h"
  19 #include "chrome/browser/ui/browser_commands.h"
  20 #include "chrome/browser/ui/browser_finder.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   DCHECK(profile_);
  62   registrar_.Add(this, chrome::NOTIFICATION_OWNERSHIP_STATUS_CHANGED,
  63                  content::NotificationService::AllSources());
  64 }
  65
  66 LocaleChangeGuard::~LocaleChangeGuard() {}
  67
  68 void LocaleChangeGuard::OnLogin() {
  69   registrar_.Add(this, content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
  70                  content::NotificationService::AllBrowserContextsAndSources());
  71 }
  72
  73 void LocaleChangeGuard::RevertLocaleChange() {
  74   if (profile_ == NULL ||
  75       from_locale_.empty() ||
  76       to_locale_.empty()) {
  77     NOTREACHED();
  78     return;
  79   }
  80   if (reverted_)
  81     return;
  82   reverted_ = true;
  83   content::RecordAction(UserMetricsAction("LanguageChange_Revert"));
  84   profile_->ChangeAppLocale(
  85       from_locale_, Profile::APP_LOCALE_CHANGED_VIA_REVERT);
  86
  87   Browser* browser = browser::FindTabbedBrowser(profile_, false,
  88                                                 chrome::HOST_DESKTOP_TYPE_ASH);
  89   if (browser)
  90     chrome::ExecuteCommand(browser, IDC_EXIT);
  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 content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME: {
 106       if (profile_ ==
 107           content::Source<WebContents>(source)->GetBrowserContext()) {
 108         // We need to perform locale change check only once, so unsubscribe.
 109         registrar_.Remove(this, content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
 110                           content::NotificationService::AllSources());
 111         Check();
 112       }
 113       break;
 114     }
 115     case chrome::NOTIFICATION_OWNERSHIP_STATUS_CHANGED: {
 116       if (DeviceSettingsService::Get()->HasPrivateOwnerKey()) {
 117         PrefService* local_state = g_browser_process->local_state();
 118         if (local_state) {
 119           PrefService* prefs = profile_->GetPrefs();
 120           if (prefs == NULL) {
 121             NOTREACHED();
 122             return;
 123           }
 124           std::string owner_locale =
 125               prefs->GetString(prefs::kApplicationLocale);
 126           if (!owner_locale.empty())
 127             local_state->SetString(prefs::kOwnerLocale, owner_locale);
 128         }
 129       }
 130       break;
 131     }
 132     default: {
 133       NOTREACHED();
 134       break;
 135     }
 136   }
 137 }
 138
 139 void LocaleChangeGuard::Check() {
 140   std::string cur_locale = g_browser_process->GetApplicationLocale();
 141   if (cur_locale.empty()) {
 142     NOTREACHED();
 143     return;
 144   }
 145
 146   PrefService* prefs = profile_->GetPrefs();
 147   if (prefs == NULL) {
 148     NOTREACHED();
 149     return;
 150   }
 151
 152   std::string to_locale = prefs->GetString(prefs::kApplicationLocale);
 153   if (to_locale != cur_locale) {
 154     // This conditional branch can occur in cases like:
 155     // (1) kApplicationLocale preference was modified by synchronization;
 156     // (2) kApplicationLocale is managed by policy.
 157     return;
 158   }
 159
 160   std::string from_locale = prefs->GetString(prefs::kApplicationLocaleBackup);
 161   if (from_locale.empty() || from_locale == to_locale)
 162     return;  // No locale change was detected, just exit.
 163
 164   if (prefs->GetString(prefs::kApplicationLocaleAccepted) == to_locale)
 165     return;  // Already accepted.
 166
 167   // Locale change detected, showing notification.
 168   if (from_locale_ != from_locale || to_locale_ != to_locale) {
 169     // Falling back to showing message in current locale.
 170     LOG(ERROR) <<
 171         "Showing locale change notification in current (not previous) language";
 172     PrepareChangingLocale(from_locale, to_locale);
 173   }
 174
 175   ash::Shell::GetInstance()->system_tray_notifier()->NotifyLocaleChanged(
 176       this, cur_locale, from_locale_, to_locale_);
 177 }
 178
 179 void LocaleChangeGuard::AcceptLocaleChange() {
 180   if (profile_ == NULL ||
 181       from_locale_.empty() ||
 182       to_locale_.empty()) {
 183     NOTREACHED();
 184     return;
 185   }
 186
 187   // Check whether locale has been reverted or changed.
 188   // If not: mark current locale as accepted.
 189   if (reverted_)
 190     return;
 191   PrefService* prefs = profile_->GetPrefs();
 192   if (prefs == NULL) {
 193     NOTREACHED();
 194     return;
 195   }
 196   if (prefs->GetString(prefs::kApplicationLocale) != to_locale_)
 197     return;
 198   content::RecordAction(UserMetricsAction("LanguageChange_Accept"));
 199   prefs->SetString(prefs::kApplicationLocaleBackup, to_locale_);
 200   prefs->SetString(prefs::kApplicationLocaleAccepted, to_locale_);
 201 }
 202
 203 void LocaleChangeGuard::PrepareChangingLocale(
 204     const std::string& from_locale, const std::string& to_locale) {
 205   std::string cur_locale = g_browser_process->GetApplicationLocale();
 206   if (!from_locale.empty())
 207     from_locale_ = from_locale;
 208   if (!to_locale.empty())
 209     to_locale_ = to_locale;
 210
 211   if (!from_locale_.empty() && !to_locale_.empty()) {
 212     string16 from = l10n_util::GetDisplayNameForLocale(
 213         from_locale_, cur_locale, true);
 214     string16 to = l10n_util::GetDisplayNameForLocale(
 215         to_locale_, cur_locale, true);
 216
 217     title_text_ = l10n_util::GetStringUTF16(
 218         IDS_OPTIONS_SETTINGS_SECTION_TITLE_LANGUAGE);
 219     message_text_ = l10n_util::GetStringFUTF16(
 220         IDS_LOCALE_CHANGE_MESSAGE, from, to);
 221     revert_link_text_ = l10n_util::GetStringFUTF16(
 222         IDS_LOCALE_CHANGE_REVERT_MESSAGE, from);
 223   }
 224 }
 225
 226 void LocaleChangeGuard::Delegate::Close(bool by_user) {
 227   if (by_user)
 228     master_->AcceptLocaleChange();
 229 }
 230
 231 std::string LocaleChangeGuard::Delegate::id() const {
 232   // Arbitrary unique Id.
 233   return "8c386938-1e3f-11e0-ac7b-18a90520e2e5";
 234 }
 235
 236 }  // namespace chromeos