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diff --git a/include/unotools/accessiblestatesethelper.hxx b/include/unotools/accessiblestatesethelper.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_UNOTOOLS_ACCESSIBLESTATESETHELPER_HXX
+#define INCLUDED_UNOTOOLS_ACCESSIBLESTATESETHELPER_HXX
+
+#include <unotools/unotoolsdllapi.h>
+
+#include <com/sun/star/accessibility/XAccessibleStateSet.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <mutex>
+
+//= XAccessibleStateSet helper classes
+
+//... namespace utl .......................................................
+namespace utl
+{
+/** @descr
+        This base class provides an implementation of the
+        <code>AccessibleStateSet</code> service.
+*/
+class UNOTOOLS_DLLPUBLIC AccessibleStateSetHelper final
+    : public cppu::WeakImplHelper<css::accessibility::XAccessibleStateSet>
+{
+public:
+    //=====  internal  ========================================================
+
+    AccessibleStateSetHelper();
+    /** constructs an object with some states initially set
+
+        <p>This ctor is compatible with
+        <method scope="comphelper">OAccessibleImplementationAccess::implGetForeignControlledStates</method></p>
+
+        @param _nInitialStates
+            is a bit mask. Every bit 2^n means that the state number n (as got from the
+            AccessibleStateType constants) should be set initially.
+    */
+    AccessibleStateSetHelper(const sal_Int64 _nInitialStates);
+
+    AccessibleStateSetHelper(const AccessibleStateSetHelper& rHelper);
+
+private:
+    virtual ~AccessibleStateSetHelper() override;
+
+public:
+    //=====  XAccessibleStateSet  ==============================================
+
+    /** Checks whether the current state set is empty.
+
+        @return
+            Returns <TRUE/> if there is no state in this state set and
+            <FALSE/> if there is at least one state set in it.
+    */
+    virtual sal_Bool SAL_CALL isEmpty() override;
+
+    /** Checks if the given state is a member of the state set of this
+        object.
+
+        @param aState
+            The state for which to check membership.  This has to be one of
+            the constants of AccessibleStateType.
+
+        @return
+            Returns <TRUE/> if the given state is a member of this object's
+            state set and <FALSE/> otherwise.
+    */
+    virtual sal_Bool SAL_CALL contains(sal_Int16 aState) override;
+
+    /** Checks if all of the given states are in this object's state
+        set.
+
+        @param aStateSet
+            This sequence of states is interpreted as set and every of its
+            members, duplicates are ignored, is checked for membership in
+            this object's state set.  Each state has to be one of the
+            constants of AccessibleStateType.
+
+        @return
+            Returns <TRUE/> if all states of the given state set are members
+            of this object's state set.  <FALSE/> is returned if at least
+            one of the states in the given state is not a member of this
+            object's state set.
+    */
+    virtual sal_Bool SAL_CALL containsAll(const css::uno::Sequence<sal_Int16>& rStateSet) override;
+
+    /** Returns a sequence of all states.
+    */
+    virtual css::uno::Sequence<sal_Int16> SAL_CALL getStates() override;
+
+    /** Adds a state to the set.
+
+        @throws css::uno::RuntimeException
+    */
+    void AddState(sal_Int16 aState);
+
+    /** Removes a state from the set if the set contains the state, otherwise nothing is done.
+
+        @throws css::uno::RuntimeException
+    */
+    void RemoveState(sal_Int16 aState);
+
+    //=====  XTypeProvider  ===================================================
+
+    /** Returns a sequence of all supported interfaces.
+    */
+    virtual css::uno::Sequence<css::uno::Type> SAL_CALL getTypes() override;
+
+    /** Returns an implementation id.
+    */
+    virtual css::uno::Sequence<sal_Int8> SAL_CALL getImplementationId() override;
+
+private:
+    /// Mutex guarding this object.
+    std::mutex maMutex;
+    /// The implementation of this helper interface.
+    sal_uInt64 maStates;
+};
+}
+//... namespace utl .......................................................
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */