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diff --git a/include/svx/sdr/animation/scheduler.hxx b/include/svx/sdr/animation/scheduler.hxx
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+++ b/include/svx/sdr/animation/scheduler.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_SVX_SDR_ANIMATION_SCHEDULER_HXX
+#define INCLUDED_SVX_SDR_ANIMATION_SCHEDULER_HXX
+
+#include <sal/types.h>
+#include <vcl/timer.hxx>
+#include <svx/svxdllapi.h>
+#include <vector>
+
+
+namespace sdr::animation
+    {
+
+        class SVXCORE_DLLPUBLIC Event
+        {
+            // time of event in ms
+            sal_uInt32                                      mnTime;
+
+        public:
+            // constructor/destructor
+            SAL_DLLPRIVATE explicit Event();
+            virtual ~Event();
+
+            // get/set time
+            SAL_DLLPRIVATE sal_uInt32 GetTime() const {  return mnTime; }
+            void SetTime(sal_uInt32 nNew);
+
+            // execute event
+            virtual void Trigger(sal_uInt32 nTime) = 0;
+        };
+
+        class SVXCORE_DLLPUBLIC Scheduler : public Timer
+        {
+            // time in ms
+            sal_uInt32                                      mnTime;
+
+            // next delta time
+            sal_uInt32                                      mnDeltaTime;
+
+            // list of events, sorted by time
+            std::vector<Event*>                             mvEvents;
+
+            // Flag which remembers if this timer is paused. Default
+            // is false.
+            bool                                            mbIsPaused;
+
+        public:
+            // constructor/destructor
+            SAL_DLLPRIVATE Scheduler();
+            virtual ~Scheduler() override;
+
+            // From baseclass Timer, the timeout call
+            virtual void Invoke() override;
+
+            // get time
+            SAL_DLLPRIVATE sal_uInt32 GetTime() const {  return mnTime; }
+
+            // #i38135#
+            SAL_DLLPRIVATE void SetTime(sal_uInt32 nTime);
+
+            // execute all ripe events, removes executed ones from the scheduler
+            SAL_DLLPRIVATE void triggerEvents();
+
+            // re-start or stop timer according to event list
+            SAL_DLLPRIVATE void checkTimeout();
+
+            // insert/remove events, wrapper to EventList methods
+            void InsertEvent(Event& rNew);
+            SAL_DLLPRIVATE void RemoveEvent(Event* pOld);
+
+            // get/set pause
+            SAL_DLLPRIVATE bool IsPaused() const { return mbIsPaused; }
+            SAL_DLLPRIVATE void SetPaused(bool bNew);
+        };
+
+} // end of namespace sdr::animation
+
+
+#endif // INCLUDED_SVX_SDR_ANIMATION_SCHEDULER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */