Retrieve the list of keyboard layouts for public sessions async

chrome/browser/ui/webui/chromeos/login/l10n_util.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_L10N_UTIL_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_L10N_UTIL_H_
 
 #include <string>
 #include <vector>
 
+#include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace base {
+class DictionaryValue;
 class ListValue;
 }
 
 namespace chromeos {
 
 // GetUILanguageList() returns a concatenated list of the most relevant
 // languages followed by all others. An entry with its "code" attribute set to
 // this value is inserted in between.
 extern const char kMostRelevantLanguagesDivider[];
 
@@ skipping 24 matching lines @@
 // followed by a divider and locale-specific keyboard layouts, if any. The list
 // will also always contain the US keyboard layout. If |selected| matches the ID
 // of any entry in the resulting list, that entry will be marked as selected.
 // In addition to returning the list of keyboard layouts, this function also
 // activates them so that they can be selected by the user (e.g. by cycling
 // through keyboard layouts via keyboard shortcuts).
 scoped_ptr<base::ListValue> GetLoginKeyboardLayouts(
     const std::string& locale,
     const std::string& selected);
 
-// Return a list of keyboard layouts that can be used for |locale|. Each list
-// entry is a dictionary that contains data such as an ID and a display name.
-// The list will consist of the device's hardware layouts, followed by a divider
-// and locale-specific keyboard layouts, if any. All layouts supported for
-// |locale| are returned, including those that produce non-Latin characters by
-// default.
-scoped_ptr<base::ListValue> GetKeyboardLayoutsForLocale(
+// Invokes |callback| with a list of keyboard layouts that can be used for
+// |locale|. Each list entry is a dictionary that contains data such as an ID
+// and a display name. The list will consist of the device's hardware layouts,
+// followed by a divider and locale-specific keyboard layouts, if any. All
+// layouts supported for |locale| are returned, including those that produce
+// non-Latin characters by default.
+typedef base::Callback<void(scoped_ptr<base::ListValue>)>
+    GetKeyboardLayoutsForLocaleCallback;
+void GetKeyboardLayoutsForLocale(
+    const GetKeyboardLayoutsForLocaleCallback& callback,
     const std::string& locale);
 
+// Returns the current keyboard layout, expressed as a dictionary that contains
+// data such as an ID and a display name.
+scoped_ptr<base::DictionaryValue> GetCurrentKeyboardLayout();
+
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_L10N_UTIL_H_