MD Settings: Languages model for language pages

chrome/browser/ui/webui/settings/languages_handler.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/webui/settings/languages_handler.h"
+
+#include "base/bind.h"
+#include "base/values.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/public/browser/web_ui.h"
+
+#if defined(OS_WIN)
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/common/pref_names.h"
+#endif
+
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
+#include "components/user_manager/user_manager.h"
+#include "components/user_manager/user_type.h"
+#endif
+
+namespace settings {
+
+LanguagesHandler::LanguagesHandler(content::WebUI* webui)
+    : profile_(Profile::FromWebUI(webui)) {
+}
+
+LanguagesHandler::~LanguagesHandler() {
+}
+
+void LanguagesHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      "setUILanguage",
+      base::Bind(&LanguagesHandler::HandleSetUILanguage,
+                 base::Unretained(this)));
+}
+
+void LanguagesHandler::HandleSetUILanguage(const base::ListValue* args) {
+  CHECK_EQ(1U, args->GetSize());
+
+  std::string language_code;
+  CHECK(args->GetString(0, &language_code));
+
+#if defined(OS_WIN)
+  PrefService* prefs = g_browser_process->local_state();
+  prefs->SetString(prefs::kApplicationLocale, language_code);
+#elif defined(OS_CHROMEOS)
+  // Secondary users and public session users cannot change the locale.
+  user_manager::UserManager* user_manager = user_manager::UserManager::Get();
+  const user_manager::User* user =
+      chromeos::ProfileHelper::Get()->GetUserByProfile(profile_);
+  if (user &&
+      user->email() == user_manager->GetPrimaryUser()->email() &&
+      user->GetType() != user_manager::USER_TYPE_PUBLIC_ACCOUNT) {
+    profile_->ChangeAppLocale(language_code,
+                              Profile::APP_LOCALE_CHANGED_VIA_SETTINGS);
+  }
+#else
+  NOTREACHED() << "Attempting to set locale on unsupported platform";
+#endif
+}
+
+}  // namespace settings