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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_NEW_TAB_PAGE_SYNC_HANDLER_H_
      6 #define CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_PAGE_SYNC_HANDLER_H_
      7 
      8 #include <string>
      9 
     10 #include "base/prefs/pref_change_registrar.h"
     11 #include "chrome/browser/sync/profile_sync_service.h"
     12 #include "chrome/browser/sync/sync_ui_util.h"
     13 #include "content/public/browser/web_ui_message_handler.h"
     14 
     15 namespace base {
     16 class ListValue;
     17 }
     18 
     19 // Sends sync-state changes to the New Tab Page for UI updating and forwards
     20 // link clicks on the page to the sync service.
     21 class NewTabPageSyncHandler : public content::WebUIMessageHandler,
     22                               public ProfileSyncServiceObserver {
     23  public:
     24   NewTabPageSyncHandler();
     25   virtual ~NewTabPageSyncHandler();
     26 
     27   // WebUIMessageHandler implementation.
     28   virtual void RegisterMessages() OVERRIDE;
     29 
     30   // Callback for "GetSyncMessage".
     31   void HandleGetSyncMessage(const base::ListValue* args);
     32   // Callback for "SyncLinkClicked".
     33   void HandleSyncLinkClicked(const base::ListValue* args);
     34 
     35   // ProfileSyncServiceObserver
     36   virtual void OnStateChanged() OVERRIDE;
     37 
     38   void OnSigninAllowedPrefChange();
     39 
     40  private:
     41   friend class MockNewTabPageSyncHandler;
     42   FRIEND_TEST_ALL_PREFIXES(NewTabPageSyncHandlerBrowserTest,
     43                            ChangeSigninAllowedToFalse);
     44 
     45   enum MessageType {
     46     HIDE,
     47     SYNC_ERROR,
     48     SYNC_PROMO
     49   };
     50   // Helper to invoke the |syncMessageChanged| JS function on the new tab page.
     51   virtual void SendSyncMessageToPage(MessageType type,
     52                                      std::string msg, std::string linktext);
     53 
     54   // Helper to query the sync service and figure out what to send to
     55   // the page, and send it via SendSyncMessageToPage.
     56   // NOTE: precondition: sync must be enabled.
     57   void BuildAndSendSyncStatus();
     58 
     59   // Helper to send a message to the NNTP which hides the sync section.
     60   void HideSyncStatusSection();
     61 
     62   // Helper to convert from a sync status message type to an NTP specific one.
     63   static MessageType FromSyncStatusMessageType(
     64       sync_ui_util::MessageType type);
     65 
     66   // Cached pointer to ProfileSyncService.
     67   ProfileSyncService* sync_service_;
     68 
     69   PrefChangeRegistrar profile_pref_registrar_;
     70 
     71   // Used to make sure we don't register ourselves twice if the user refreshes
     72   // the new tab page.
     73   bool waiting_for_initial_page_load_;
     74 
     75   DISALLOW_COPY_AND_ASSIGN(NewTabPageSyncHandler);
     76 };
     77 
     78 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_PAGE_SYNC_HANDLER_H_
     79