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diff --git a/slideshow/source/engine/activities/continuouskeytimeactivitybase.hxx b/slideshow/source/engine/activities/continuouskeytimeactivitybase.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_ENGINE_ACTIVITIES_CONTINUOUSKEYTIMEACTIVITYBASE_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_CONTINUOUSKEYTIMEACTIVITYBASE_HXX
+
+#include "simplecontinuousactivitybase.hxx"
+
+#include <basegfx/utils/keystoplerp.hxx>
+
+
+namespace slideshow::internal
+    {
+        /** Interpolated, key-times animation.
+
+            This class implements an interpolated key-times
+            animation, with continuous time.
+        */
+        class ContinuousKeyTimeActivityBase : public SimpleContinuousActivityBase
+        {
+        public:
+            explicit ContinuousKeyTimeActivityBase( const ActivityParameters& rParms );
+
+            using SimpleContinuousActivityBase::perform;
+
+            /** Hook for derived classes
+
+                This method will be called from perform(), already
+                equipped with the modified time (nMinNumberOfFrames, repeat,
+                acceleration and deceleration taken into account).
+
+                @param nIndex
+                Current index of the key times/key values.
+
+                @param nFractionalIndex
+                Fractional value from the [0,1] range, specifying
+                the position between nIndex and nIndex+1.
+
+                @param nRepeatCount
+                Number of full repeats already performed
+            */
+            virtual void perform( sal_uInt32    nIndex,
+                                  double        nFractionalIndex,
+                                  sal_uInt32    nRepeatCount ) const = 0;
+
+            /// From SimpleContinuousActivityBase class
+            virtual void simplePerform( double      nSimpleTime,
+                                        sal_uInt32  nRepeatCount ) const override;
+
+        private:
+            const ::basegfx::utils::KeyStopLerp maLerper;
+        };
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_CONTINUOUSKEYTIMEACTIVITYBASE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */