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diff --git a/slideshow/source/inc/animation.hxx b/slideshow/source/inc/animation.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_ANIMATION_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_ANIMATION_HXX
+
+#include "animatableshape.hxx"
+#include "shapeattributelayer.hxx"
+#include "disposable.hxx"
+
+
+/* Definition of Animation interface */
+
+namespace slideshow::internal
+    {
+        /** Interface defining a generic animation.
+
+            This interface is used by objects implementing the
+            Activity interface to drive the animation effect. Objects
+            implementing this interface will receive time-varying
+            animation values, which they can forward to the
+            appropriate attributes. The type of these animation values
+            is given in derived interfaces.
+
+            @see NumberAnimation
+            @see ColorAnimation
+            @see PairAnimation
+         */
+        class Animation : public virtual SharedPtrAble
+        {
+        public:
+            /** Notify that the animation going active soon.
+
+                Implementers should preload any buffers, and create
+                any expensive objects at this time.
+
+                @param rShape
+                Shape to apply this animation to.
+
+                @param rAttrLayer
+                Attribute layer to play the animation on.
+             */
+            virtual void prefetch( ) = 0;
+
+            /** Notify that the animation is about to begin.
+
+                Implementers are free to start accompanying effects,
+                such as sounds, and the animation timer now.
+
+                @param rShape
+                Shape to apply this animation to.
+
+                @param rAttrLayer
+                Attribute layer to play the animation on.
+             */
+            virtual void start( const AnimatableShapeSharedPtr&     rShape,
+                                const ShapeAttributeLayerSharedPtr& rAttrLayer ) = 0;
+
+            /** Notify that the animation is about to end.
+             */
+            virtual void end() = 0;
+        };
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_ANIMATION_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */