chrome/browser/ui/webui/ntp/recently_closed_tabs_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_RECENTLY_CLOSED_TABS_HANDLER_H_
   6 #define CHROME_BROWSER_UI_WEBUI_NTP_RECENTLY_CLOSED_TABS_HANDLER_H_
   7
   8 #include "base/values.h"
   9 #include "chrome/browser/sessions/tab_restore_service.h"
  10 #include "chrome/browser/sessions/tab_restore_service_observer.h"
  11 #include "content/public/browser/web_ui_message_handler.h"
  12
  13 class TabRestoreService;
  14
  15 class RecentlyClosedTabsHandler : public content::WebUIMessageHandler,
  16                                   public TabRestoreServiceObserver {
  17  public:
  18   RecentlyClosedTabsHandler() : tab_restore_service_(NULL) {}
  19   virtual ~RecentlyClosedTabsHandler();
  20
  21   // WebUIMessageHandler implementation.
  22   virtual void RegisterMessages() OVERRIDE;
  23
  24   // Callback for the "reopenTab" message. Rewrites the history of the
  25   // currently displayed tab to be the one in TabRestoreService with a
  26   // history of a session passed in through the content pointer.
  27   void HandleReopenTab(const base::ListValue* args);
  28
  29   // Callback for the "getRecentlyClosedTabs" message.
  30   void HandleGetRecentlyClosedTabs(const base::ListValue* args);
  31
  32   // Callback for the "clearRecentlyClosed" message.
  33   void HandleClearRecentlyClosed(const base::ListValue* args);
  34
  35   // Observer callback for TabRestoreServiceObserver. Sends data on
  36   // recently closed tabs to the javascript side of this page to
  37   // display to the user.
  38   virtual void TabRestoreServiceChanged(TabRestoreService* service) OVERRIDE;
  39
  40   // Observer callback to notice when our associated TabRestoreService
  41   // is destroyed.
  42   virtual void TabRestoreServiceDestroyed(TabRestoreService* service) OVERRIDE;
  43
  44   // Converts a list of TabRestoreService entries to the JSON format required
  45   // by the NTP and adds them to the given list value.
  46   static void CreateRecentlyClosedValues(
  47       const TabRestoreService::Entries& entries,
  48       base::ListValue* entry_list_value);
  49
  50  private:
  51   // Construct and initialize tab_restore_service_ if it's NULL.
  52   // tab_restore_service_ may still be NULL, however, in incognito mode.
  53   void EnsureTabRestoreService();
  54
  55   // TabRestoreService that we are observing.
  56   TabRestoreService* tab_restore_service_;
  57
  58   DISALLOW_COPY_AND_ASSIGN(RecentlyClosedTabsHandler);
  59 };
  60
  61 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_RECENTLY_CLOSED_TABS_HANDLER_H_