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diff --git a/include/comphelper/SelectionMultiplex.hxx b/include/comphelper/SelectionMultiplex.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_COMPHELPER_SELECTIONMULTIPLEX_HXX
+#define INCLUDED_COMPHELPER_SELECTIONMULTIPLEX_HXX
+
+#include <com/sun/star/view/XSelectionChangeListener.hpp>
+#include <com/sun/star/lang/EventObject.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <comphelper/comphelperdllapi.h>
+
+namespace com::sun::star::view { class XSelectionSupplier; }
+
+//= selection helper classes
+
+
+namespace comphelper
+{
+
+
+    //= OSelectionChangeListener
+
+    /// simple listener adapter for selections
+    class COMPHELPER_DLLPUBLIC OSelectionChangeListener
+    {
+        friend class OSelectionChangeMultiplexer;
+
+    public:
+        OSelectionChangeListener() {}
+        virtual ~OSelectionChangeListener();
+
+        /// @throws css::uno::RuntimeException
+        virtual void _selectionChanged( const css::lang::EventObject& aEvent ) = 0;
+        /// @throws css::uno::RuntimeException
+        virtual void _disposing(const css::lang::EventObject& _rSource);
+    };
+
+
+    //= OSelectionChangeMultiplexer
+
+    /// multiplexer for selection changes
+    class COMPHELPER_DLLPUBLIC OSelectionChangeMultiplexer  :public cppu::WeakImplHelper< css::view::XSelectionChangeListener>
+    {
+        friend class OSelectionChangeListener;
+        css::uno::Reference< css::view::XSelectionSupplier>  m_xSet;
+        OSelectionChangeListener*                            m_pListener;
+        sal_Int32                                            m_nLockCount;
+
+        OSelectionChangeMultiplexer(const OSelectionChangeMultiplexer&) = delete;
+        OSelectionChangeMultiplexer& operator=(const OSelectionChangeMultiplexer&) = delete;
+    protected:
+        virtual ~OSelectionChangeMultiplexer() override;
+    public:
+        OSelectionChangeMultiplexer(OSelectionChangeListener* _pListener, const  css::uno::Reference< css::view::XSelectionSupplier>& _rxSet);
+
+    // XEventListener
+        virtual void SAL_CALL disposing( const  css::lang::EventObject& Source ) override;
+
+    // XSelectionChangeListener
+        virtual void SAL_CALL selectionChanged( const css::lang::EventObject& aEvent ) override;
+
+        /// incremental lock
+        void        lock();
+        /// incremental unlock
+        void        unlock();
+        /// get the lock count
+        sal_Int32   locked() const { return m_nLockCount; }
+    };
+
+
+}   // namespace comphelper
+
+
+#endif // INCLUDED_COMPHELPER_SELECTIONMULTIPLEX_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */