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// 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_NTP_RECENTLY_CLOSED_TABS_HANDLER_H_
#define CHROME_BROWSER_UI_WEBUI_NTP_RECENTLY_CLOSED_TABS_HANDLER_H_
#include "base/values.h"
#include "chrome/browser/sessions/tab_restore_service.h"
#include "chrome/browser/sessions/tab_restore_service_observer.h"
#include "content/public/browser/web_ui_message_handler.h"
class TabRestoreService;
class RecentlyClosedTabsHandler : public content::WebUIMessageHandler,
public TabRestoreServiceObserver {
public:
RecentlyClosedTabsHandler() : tab_restore_service_(NULL) {}
virtual ~RecentlyClosedTabsHandler();
// WebUIMessageHandler implementation.
virtual void RegisterMessages() OVERRIDE;
// Callback for the "reopenTab" message. Rewrites the history of the
// currently displayed tab to be the one in TabRestoreService with a
// history of a session passed in through the content pointer.
void HandleReopenTab(const ListValue* args);
// Callback for the "getRecentlyClosedTabs" message.
void HandleGetRecentlyClosedTabs(const ListValue* args);
// Callback for the "clearRecentlyClosed" message.
void HandleClearRecentlyClosed(const ListValue* args);
// Observer callback for TabRestoreServiceObserver. Sends data on
// recently closed tabs to the javascript side of this page to
// display to the user.
virtual void TabRestoreServiceChanged(TabRestoreService* service) OVERRIDE;
// Observer callback to notice when our associated TabRestoreService
// is destroyed.
virtual void TabRestoreServiceDestroyed(TabRestoreService* service) OVERRIDE;
// Converts a list of TabRestoreService entries to the JSON format required
// by the NTP and adds them to the given list value.
static void CreateRecentlyClosedValues(
const TabRestoreService::Entries& entries,
base::ListValue* entry_list_value);
private:
// Construct and initialize tab_restore_service_ if it's NULL.
// tab_restore_service_ may still be NULL, however, in incognito mode.
void EnsureTabRestoreService();
// TabRestoreService that we are observing.
TabRestoreService* tab_restore_service_;
DISALLOW_COPY_AND_ASSIGN(RecentlyClosedTabsHandler);
};
#endif // CHROME_BROWSER_UI_WEBUI_NTP_RECENTLY_CLOSED_TABS_HANDLER_H_
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