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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_NTP_LOGIN_HANDLER_H_
      6 #define CHROME_BROWSER_UI_WEBUI_NTP_NTP_LOGIN_HANDLER_H_
      7 
      8 #include "base/prefs/pref_member.h"
      9 #include "content/public/browser/notification_observer.h"
     10 #include "content/public/browser/notification_registrar.h"
     11 #include "content/public/browser/web_ui_message_handler.h"
     12 
     13 class Profile;
     14 
     15 // The NTP login handler currently simply displays the current logged in
     16 // username at the top of the NTP (and update itself when that changes).
     17 // In the future it may expand to allow users to login from the NTP.
     18 class NTPLoginHandler : public content::WebUIMessageHandler,
     19                         public content::NotificationObserver {
     20  public:
     21   NTPLoginHandler();
     22   virtual ~NTPLoginHandler();
     23 
     24   // WebUIMessageHandler interface
     25   virtual void RegisterMessages() OVERRIDE;
     26 
     27   // content::NotificationObserver interface
     28   virtual void Observe(int type,
     29                        const content::NotificationSource& source,
     30                        const content::NotificationDetails& details) OVERRIDE;
     31 
     32   // Returns true if the login handler should be shown in a new tab page
     33   // for the given |profile|. |profile| must not be NULL.
     34   static bool ShouldShow(Profile* profile);
     35 
     36   // Registers values (strings etc.) for the page.
     37   static void GetLocalizedValues(Profile* profile,
     38                                  base::DictionaryValue* values);
     39 
     40  private:
     41   // User actions while on the NTP when clicking on or viewing the sync promo.
     42   enum NTPSignInPromoBuckets {
     43     NTP_SIGN_IN_PROMO_VIEWED,
     44     NTP_SIGN_IN_PROMO_CLICKED,
     45     NTP_SIGN_IN_PROMO_BUCKET_BOUNDARY,
     46   };
     47 
     48   // Called from JS when the NTP is loaded. |args| is the list of arguments
     49   // passed from JS and should be an empty list.
     50   void HandleInitializeSyncLogin(const base::ListValue* args);
     51 
     52   // Called from JS when the user clicks the login container. It shows the
     53   // appropriate UI based on the current sync state. |args| is the list of
     54   // arguments passed from JS and should be an empty list.
     55   void HandleShowSyncLoginUI(const base::ListValue* args);
     56 
     57   // Records actions in SyncPromo.NTPPromo histogram.
     58   void RecordInHistogram(int type);
     59 
     60   // Called from JS when the sync promo NTP bubble has been displayed. |args| is
     61   // the list of arguments passed from JS and should be an empty list.
     62   void HandleLoginMessageSeen(const base::ListValue* args);
     63 
     64   // Called from JS when the user clicks on the advanced link the sync promo NTP
     65   // bubble. Use use this to navigate to the sync settings page. |args| is the
     66   // list of arguments passed from JS and should be an empty list.
     67   void HandleShowAdvancedLoginUI(const base::ListValue* args);
     68 
     69   // Internal helper method
     70   void UpdateLogin();
     71 
     72   StringPrefMember username_pref_;
     73   BooleanPrefMember signin_allowed_pref_;
     74   content::NotificationRegistrar registrar_;
     75 };
     76 
     77 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NTP_LOGIN_HANDLER_H_
     78