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diff --git a/slideshow/source/inc/numberanimation.hxx b/slideshow/source/inc/numberanimation.hxx
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+++ b/slideshow/source/inc/numberanimation.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_NUMBERANIMATION_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_NUMBERANIMATION_HXX
+
+#include "animation.hxx"
+
+
+/* Definition of NumberAnimation interface */
+
+namespace slideshow::internal
+    {
+        /** Interface defining a number animation.
+
+            This interface is a specialization of the Animation
+            interface, and is used to animate attributes representable
+            by a single floating point value.
+         */
+        class NumberAnimation : public Animation
+        {
+        public:
+            typedef double ValueType;
+
+            /** Set the animation to value x
+
+                @param x
+                Current animation value (must be in an
+                attribute-specific permissible range). Overflowing
+                values will be clipped to the permissible range
+                internally.
+             */
+            virtual bool operator()( double x ) = 0;
+
+            /** Request the underlying value for this animation.
+
+                This is necessary for pure To or By animations, as the
+                Activity cannot determine a sensible start value
+                otherwise.
+
+                @attention Note that you are only permitted to query
+                for the underlying value, if the animation has actually
+                been started (via start() call).
+             */
+            virtual double getUnderlyingValue() const = 0;
+        };
+
+        typedef ::std::shared_ptr< NumberAnimation > NumberAnimationSharedPtr;
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_NUMBERANIMATION_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */