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      1 // Copyright (c) 2011 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_UI_WEBUI_NTP_LOGIN_HANDLER_H_
      6 #define CHROME_BROWSER_UI_WEBUI_NTP_LOGIN_HANDLER_H_
      7 #pragma once
      8 
      9 #include "chrome/browser/prefs/pref_member.h"
     10 #include "content/browser/webui/web_ui.h"
     11 #include "content/common/notification_observer.h"
     12 
     13 // The NTP login handler currently simply displays the current logged in
     14 // username at the top of the NTP (and update itself when that changes).
     15 // In the future it may expand to allow users to login from the NTP.
     16 class NTPLoginHandler : public WebUIMessageHandler,
     17                         public NotificationObserver {
     18  public:
     19   NTPLoginHandler();
     20   ~NTPLoginHandler();
     21 
     22   virtual WebUIMessageHandler* Attach(WebUI* web_ui);
     23 
     24   // WebUIMessageHandler interface
     25   virtual void RegisterMessages();
     26 
     27   // NotificationObserver interface
     28   virtual void Observe(NotificationType type,
     29                        const NotificationSource& source,
     30                        const NotificationDetails& details);
     31 
     32  private:
     33   // Called from JS when the NTP is loaded.
     34   void HandleInitializeLogin(const ListValue* args);
     35 
     36   // Internal helper method
     37   void UpdateLogin();
     38 
     39   StringPrefMember username_pref_;
     40 };
     41 
     42 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_LOGIN_HANDLER_H_
     43