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diff --git a/winaccessibility/inc/AccTopWindowListener.hxx b/winaccessibility/inc/AccTopWindowListener.hxx
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+++ b/winaccessibility/inc/AccTopWindowListener.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <com/sun/star/awt/XTopWindowListener.hpp>
+#include <com/sun/star/awt/XExtendedToolkit.hpp>
+#include <com/sun/star/accessibility/XAccessibleContext.hpp>
+
+#include <cppuhelper/implbase.hxx>
+
+#include "AccObjectManagerAgent.hxx"
+
+/**
+ * AccEventListener is the general event listener for all top windows. The top windows defined
+ * in UNO are: FRAME, WINDOW, DIALOG, MENU, TOOLTIP.
+ * It implements the methods of XTopWindowListener and the most important method is windowOpened().
+ * In this method, all the accessible objects (including COM object and Uno objects) are created and
+ * cached into bridge managers, and they are monitored by listeners for later accessible event handling.
+ */
+class AccTopWindowListener : public ::cppu::WeakImplHelper<css::awt::XTopWindowListener>
+{
+private:
+    AccObjectManagerAgent accManagerAgent;
+
+public:
+    AccTopWindowListener();
+    virtual ~AccTopWindowListener() override;
+
+    // XTopWindowListener
+    virtual void SAL_CALL windowOpened(const css::lang::EventObject& e) override;
+    virtual void SAL_CALL windowClosing(const css::lang::EventObject& e) override;
+    virtual void SAL_CALL windowClosed(const css::lang::EventObject& e) override;
+    virtual void SAL_CALL windowMinimized(const css::lang::EventObject& e) override;
+    virtual void SAL_CALL windowNormalized(const css::lang::EventObject& e) override;
+    virtual void SAL_CALL windowActivated(const css::lang::EventObject& e) override;
+    virtual void SAL_CALL windowDeactivated(const css::lang::EventObject& e) override;
+
+    // XEventListener
+    virtual void SAL_CALL disposing(const css::lang::EventObject& Source) override;
+
+    virtual void AddAllListeners(css::accessibility::XAccessible* pAccessible,
+                                 css::accessibility::XAccessible* pParentXAcc, HWND pWND);
+    //for On-Demand load.
+    virtual void HandleWindowOpened(css::accessibility::XAccessible* pAccessible);
+
+    sal_Int64 GetMSComPtr(sal_Int64 hWnd, sal_Int64 lParam, sal_Int64 wParam);
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */