Refresh the history page if history entries get deleted, except for when currently editing entries

chrome/browser/ui/webui/history_ui.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_HISTORY_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_HISTORY_UI_H_
 #pragma once
 
 #include <string>
 
 #include "base/string16.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 #include "chrome/browser/ui/webui/chrome_web_ui.h"
 #include "content/browser/cancelable_request.h"
+#include "content/common/notification_registrar.h"
 
 class GURL;
 
 // The handler for Javascript messages related to the "history" view.
-class BrowsingHistoryHandler : public WebUIMessageHandler {
+class BrowsingHistoryHandler : public WebUIMessageHandler,
+                               public NotificationObserver {
  public:
   BrowsingHistoryHandler();
   virtual ~BrowsingHistoryHandler();
 
   // WebUIMessageHandler implementation.
   virtual WebUIMessageHandler* Attach(WebUI* web_ui);
   virtual void RegisterMessages();
 
   // Callback for the "getHistory" message.
   void HandleGetHistory(const ListValue* args);
 
   // Callback for the "searchHistory" message.
   void HandleSearchHistory(const ListValue* args);
 
   // Callback for the "removeURLsOnOneDay" message.
   void HandleRemoveURLsOnOneDay(const ListValue* args);
 
   // Handle for "clearBrowsingData" message.
   void HandleClearBrowsingData(const ListValue* args);
 
+  // NotificationObserver implementation.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
  private:
   // Callback from the history system when the history list is available.
   void QueryComplete(HistoryService::Handle request_handle,
                      history::QueryResults* results);
 
   // Callback from the history system when visits were deleted.
   void RemoveComplete();
 
   // Extract the arguments from the call to HandleSearchHistory.
   void ExtractSearchHistoryArguments(const ListValue* args,
                                      int* month,
                                      string16* query);
 
   // Figure out the query options for a month-wide query.
   history::QueryOptions CreateMonthQueryOptions(int month);
 
+  NotificationRegistrar registrar_;
+
   // Current search text.
   string16 search_text_;
 
   // Our consumer for search requests to the history service.
   CancelableRequestConsumerT<int, 0> cancelable_search_consumer_;
 
   // Our consumer for delete requests to the history service.
   CancelableRequestConsumerT<int, 0> cancelable_delete_consumer_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowsingHistoryHandler);
 };
 
 class HistoryUI : public ChromeWebUI {
  public:
   explicit HistoryUI(TabContents* contents);
 
   // Return the URL for a given search term.
   static const GURL GetHistoryURLWithSearchText(const string16& text);
 
   static RefCountedMemory* GetFaviconResourceBytes();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HistoryUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_HISTORY_UI_H_