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diff --git a/sd/source/ui/inc/tools/AsynchronousTask.hxx b/sd/source/ui/inc/tools/AsynchronousTask.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
+
+namespace sd::tools
+{
+/** Interface for the asynchronous execution of a task.  This interface
+    allows a controller to run the task either timer based with a fixed
+    amount of time between the steps or thread based one step right after
+    the other.
+*/
+class AsynchronousTask
+{
+public:
+    /** Run the next step of the task.  After HasNextStep() returns false
+        this method should ignore further calls.
+    */
+    virtual void RunNextStep() = 0;
+
+    /** Return <TRUE/> when there is at least one more step to execute.
+        When the task has been executed completely then <FALSE/> is
+        returned.
+    */
+    virtual bool HasNextStep() = 0;
+
+protected:
+    ~AsynchronousTask() {}
+};
+
+} // end of namespace ::sd::tools
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */