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      1 // Copyright (c) 2013 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_WELCOME_HANDLER_ANDROID_H_
      6 #define CHROME_BROWSER_UI_WEBUI_WELCOME_HANDLER_ANDROID_H_
      7 
      8 #include "base/scoped_observer.h"
      9 #include "chrome/browser/sync/profile_sync_service.h"
     10 #include "chrome/browser/sync/profile_sync_service_observer.h"
     11 #include "content/public/browser/web_ui_message_handler.h"
     12 
     13 namespace base {
     14 class ListValue;
     15 }
     16 
     17 // Handler class for chrome://welcome page.
     18 class WelcomeHandler : public content::WebUIMessageHandler,
     19                        public ProfileSyncServiceObserver {
     20  public:
     21   WelcomeHandler();
     22   virtual ~WelcomeHandler();
     23 
     24   // content::WebUIMessageHandler implementation.
     25   virtual void RegisterMessages() OVERRIDE;
     26 
     27   // Callback for the "updateSyncFooterVisibility" message. This makes the sync
     28   // footer in the page visible if sync is enabled.
     29   void HandleUpdateSyncFooterVisibility(const base::ListValue* args);
     30 
     31   // Callback for the "showSyncSettings" message. This opens the sync settings
     32   // menu fragment.
     33   void HandleShowSyncSettings(const base::ListValue* args);
     34 
     35   // Callback for the "showTermsOfService" message. This opens the terms of
     36   // service popup.
     37   void HandleShowTermsOfService(const base::ListValue* args);
     38 
     39   // ProfileSyncServiceObserver implementation
     40   virtual void OnStateChanged() OVERRIDE;
     41 
     42  private:
     43   // Update the sync footer visibility. Set |forced| if you want to force to
     44   // send an update to the renderer regardless of whether we assume the state
     45   // is up to date or not.
     46   void UpdateSyncFooterVisibility(bool forced);
     47 
     48   // Cached pointer to the sync service for this profile.
     49   ProfileSyncService* sync_service_;
     50 
     51   ScopedObserver<ProfileSyncService, WelcomeHandler> observer_manager_;
     52 
     53   // Whether the sync footer is visible on the page.
     54   bool is_sync_footer_visible_;
     55 
     56   DISALLOW_COPY_AND_ASSIGN(WelcomeHandler);
     57 };
     58 
     59 #endif  // CHROME_BROWSER_UI_WEBUI_WELCOME_HANDLER_ANDROID_H_
     60