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diff --git a/slideshow/source/inc/wakeupevent.hxx b/slideshow/source/inc/wakeupevent.hxx
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+++ b/slideshow/source/inc/wakeupevent.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_WAKEUPEVENT_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_WAKEUPEVENT_HXX
+
+#include <canvas/elapsedtime.hxx>
+
+#include "event.hxx"
+#include "activitiesqueue.hxx"
+
+namespace slideshow::internal {
+
+/** Little helper class, used to set Activities active again
+    after some sleep period.
+
+    Clients can use this class to schedule wakeup events at
+    the EventQueue, to avoid busy-waiting for the next
+    discrete time instant.
+*/
+class WakeupEvent : public Event
+{
+public:
+    WakeupEvent(
+        std::shared_ptr< ::canvas::tools::ElapsedTime > const& pTimeBase,
+        ActivitiesQueue & rActivityQueue );
+    WakeupEvent(const WakeupEvent&) = delete;
+    WakeupEvent& operator=(const WakeupEvent&) = delete;
+
+    virtual void dispose() override;
+    virtual bool fire() override;
+    virtual bool isCharged() const override;
+    virtual double getActivationTime( double nCurrentTime ) const override;
+
+    /// Start the internal timer
+    void start();
+
+    /** Set the next timeout this object should generate.
+
+        @param nextTime
+        Absolute time, measured from the last start() call,
+        when this event should wakeup the Activity again. If
+        your time is relative, simply call start() just before
+        every setNextTimeout() call.
+    */
+    void setNextTimeout( double nextTime );
+
+    /** Set activity to wakeup.
+
+        The activity given here will be reinserted into the
+        ActivitiesQueue, once the timeout is reached.
+    */
+    void setActivity( const ActivitySharedPtr& rActivity );
+
+private:
+    ::canvas::tools::ElapsedTime    maTimer;
+    double                          mnNextTime;
+    ActivitySharedPtr               mpActivity;
+    ActivitiesQueue&                mrActivityQueue;
+};
+
+typedef ::std::shared_ptr< WakeupEvent > WakeupEventSharedPtr;
+
+} // namespace presentation::internal
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_WAKEUPEVENT_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */