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diff --git a/vcl/inc/osx/a11yfocustracker.hxx b/vcl/inc/osx/a11yfocustracker.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 .
+ */
+
+#ifndef INCLUDED_VCL_INC_OSX_A11YFOCUSTRACKER_HXX
+#define INCLUDED_VCL_INC_OSX_A11YFOCUSTRACKER_HXX
+
+#include <com/sun/star/accessibility/XAccessible.hpp>
+
+#include "keyboardfocuslistener.hxx"
+
+#include <rtl/instance.hxx>
+
+#include <tools/link.hxx>
+#include <vcl/vclevent.hxx>
+#include <set>
+
+namespace vcl { class Window; }
+class ToolBox;
+class DocumentFocusListener;
+
+
+class AquaA11yFocusTracker
+{
+
+public:
+    AquaA11yFocusTracker();
+
+    ~AquaA11yFocusTracker();
+
+    css::uno::Reference< css::accessibility::XAccessible > const & getFocusedObject() { return m_xFocusedObject; };
+
+    // sets the currently focus object and notifies the FocusEventListener (if any)
+    void setFocusedObject(const css::uno::Reference< css::accessibility::XAccessible >& xAccessible);
+
+    // may evolve to add/remove later
+    void setFocusListener(const rtl::Reference< KeyboardFocusListener >& aFocusListener) { m_aFocusListener = aFocusListener; };
+
+protected:
+
+    // received a WINDOW_GETFOCUS event for this window
+    void window_got_focus(vcl::Window *pWindow);
+
+    // received a TOOLBOX_HIGHLIGHT event for this window
+    void toolbox_highlight_on(vcl::Window *pWindow);
+
+    // received a TOOLBOX_HIGHLIGHTOFF event for this window
+    void toolbox_highlight_off(vcl::Window const *pWindow);
+
+    // received a TABPAGE_ACTIVATE event for this window
+    void tabpage_activated(vcl::Window *pWindow);
+
+    // received a MENU_HIGHLIGHT event for this window
+    void menu_highlighted(const ::VclMenuEvent *pEvent);
+
+    // toolbox items are widgets in gtk+ and Cocoa
+    void notify_toolbox_item_focus(ToolBox *pToolBox);
+
+    // toolbox item opened a floating window (e.g. color chooser)
+    void toolbox_open_floater(vcl::Window *pWindow);
+
+    // callback function for Application::addEventListener
+    static void WindowEventHandler(void * pThis, VclSimpleEvent&);
+
+private:
+    // the accessible object that has the keyboard focus (if any)
+    css::uno::Reference< css::accessibility::XAccessible > m_xFocusedObject;
+
+    // the listener for focus events
+    rtl::Reference< KeyboardFocusListener > m_aFocusListener;
+
+    // the list of Windows that need deeper (focus) investigation
+    std::set<VclPtr<vcl::Window>> m_aDocumentWindowList;
+
+    // the link object needed for Application::addEventListener
+    Link<VclSimpleEvent&,void> m_aWindowEventLink;
+
+    // the UNO XAccessibilityEventListener for Documents and other non VCL objects
+    const rtl::Reference< DocumentFocusListener > m_xDocumentFocusListener;
+};
+
+struct TheAquaA11yFocusTracker:
+    rtl::Static<AquaA11yFocusTracker, TheAquaA11yFocusTracker>
+{};
+
+#endif // INCLUDED_VCL_INC_OSX_A11YFOCUSTRACKER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */