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diff --git a/slideshow/source/inc/event.hxx b/slideshow/source/inc/event.hxx
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+++ b/slideshow/source/inc/event.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_SLIDESHOW_SOURCE_INC_EVENT_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_EVENT_HXX
+
+#include "disposable.hxx"
+#include <rtl/ustring.hxx>
+#include <memory>
+#include <vector>
+
+namespace slideshow {
+namespace internal {
+
+/** Definition of Event interface
+ */
+class Event : public Disposable
+{
+public:
+    Event (const OUString& rsDescription) : msDescription(rsDescription) {}
+
+    /** Execute the event.
+
+        @return true, if event was successfully executed.
+    */
+    virtual bool fire() = 0;
+
+    /** Query whether this event is still charged, i.e. able
+        to fire.
+
+        Inactive events are ignored by the normal event
+        containers (EventQueue, UserEventQueue etc.), and no
+        explicit fire() is called upon them.
+
+        @return true, if this event has already been fired.
+    */
+    virtual bool isCharged() const = 0;
+
+    /** Query the activation time instant this event shall be
+        fired, if it was inserted at instant nCurrentTime into
+        the queue.
+
+        @param nCurrentTime
+        The time from which the activation time is to be
+        calculated from.
+
+        @return the time instant in seconds, on which this
+        event is to be fired.
+    */
+    virtual double getActivationTime( double nCurrentTime ) const = 0;
+
+    const OUString& GetDescription() const { return msDescription; }
+
+private:
+    const OUString msDescription;
+};
+
+typedef ::std::shared_ptr< Event > EventSharedPtr;
+typedef ::std::vector< EventSharedPtr > VectorOfEvents;
+
+} // namespace internal
+} // namespace presentation
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_EVENT_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */