chrome/browser/ui/webui/ntp/ntp_login_handler.h

   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_