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