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diff --git a/slideshow/source/engine/activities/activitybase.hxx b/slideshow/source/engine/activities/activitybase.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_ACTIVITYBASE_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_ACTIVITYBASE_HXX
+
+#include <animationactivity.hxx>
+#include "activityparameters.hxx"
+#include <animatableshape.hxx>
+#include <shapeattributelayer.hxx>
+
+namespace slideshow::internal {
+
+/** Base class for animation activities.
+
+    This whole class hierarchy is only for code sharing
+    between the various specializations (with or without
+    key times, fully discrete, etc.).
+*/
+class ActivityBase : public AnimationActivity
+{
+public:
+    explicit ActivityBase( const ActivityParameters& rParms );
+
+    /// From Disposable interface
+    virtual void dispose() override;
+
+protected:
+    /** From Activity interface
+
+        Derived classes should override, call this first
+        and then perform their work.
+    */
+    virtual bool perform() override;
+    virtual double calcTimeLag() const override;
+    virtual bool isActive() const override;
+
+private:
+    virtual void dequeued() override;
+
+    // From AnimationActivity interface
+    virtual void setTargets(
+        const AnimatableShapeSharedPtr&        rShape,
+        const ShapeAttributeLayerSharedPtr&    rAttrLayer ) override;
+
+private:
+    /** Hook for derived classes
+
+        This method will be called from the first
+        perform() invocation, to signal the start of the
+        activity.
+    */
+    virtual void startAnimation() = 0;
+
+    /** Hook for derived classes
+
+        This method will be called after the last perform()
+        invocation, and after the potential changes of that
+        perform() call are committed to screen. That is, in
+        endAnimation(), the animation objects (sprites,
+        animation) can safely be destroyed, without causing
+        visible artifacts on screen.
+    */
+    virtual void endAnimation() = 0;
+
+protected:
+
+    /** End this activity, in a regular way.
+
+        This method is for derived classes needing to signal a
+        regular activity end (i.e. because the regular
+        duration is over)
+    */
+    void endActivity();
+
+    /** Modify fractional time.
+
+        This method modifies the fractional time (total
+        duration mapped to the [0,1] range) to the
+        effective simple time, but only according to
+        acceleration/deceleration.
+    */
+    double calcAcceleratedTime( double nT ) const;
+
+    bool isDisposed() const {
+        return (!mbIsActive && !mpEndEvent && !mpShape &&
+                !mpAttributeLayer);
+    }
+
+    EventQueue& getEventQueue() const { return mrEventQueue; }
+
+    const AnimatableShapeSharedPtr& getShape() const { return mpShape; }
+
+    const ShapeAttributeLayerSharedPtr& getShapeAttributeLayer() const
+        { return mpAttributeLayer; }
+
+    bool isRepeatCountValid() const { return bool(maRepeats); }
+    double getRepeatCount() const { return *maRepeats; }
+    bool isAutoReverse() const { return mbAutoReverse; }
+
+private:
+    /// Activity:
+    virtual void end() override;
+    virtual void performEnd() = 0;
+
+private:
+    EventSharedPtr                  mpEndEvent;
+    EventQueue&                     mrEventQueue;
+    AnimatableShapeSharedPtr        mpShape; // only to pass on to animation
+    ShapeAttributeLayerSharedPtr    mpAttributeLayer; // only to pass on to anim
+
+    ::std::optional<double> const maRepeats;
+    const double                    mnAccelerationFraction;
+    const double                    mnDecelerationFraction;
+
+    const bool                      mbAutoReverse;
+
+    // true, if perform() has not yet been called:
+    mutable bool                    mbFirstPerformCall;
+    bool                            mbIsActive;
+};
+
+} // namespace presentation::internal
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_ACTIVITYBASE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */