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diff --git a/slideshow/source/inc/animationactivity.hxx b/slideshow/source/inc/animationactivity.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_ANIMATIONACTIVITY_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_ANIMATIONACTIVITY_HXX
+
+#include "activity.hxx"
+#include "animatableshape.hxx"
+#include "shapeattributelayer.hxx"
+
+
+/* Definition of AnimationActivity interface */
+
+namespace slideshow::internal
+    {
+
+        /** Extends the Activity interface with animation-specific functions
+         */
+        class AnimationActivity : public Activity
+        {
+        public:
+            /** Sets targets (shape and attributeLayer)
+
+                Since attribute layers can only be generated when the
+                animation starts, the Activity owner must be able to
+                pass it into the Activity after initial creation. The
+                same applies to the actual shape the animation must
+                run for, since e.g. subsetted shapes are generated
+                close before the animation starts, too (this is not
+                necessary in and out of itself, but for performance
+                reasons. Otherwise, character iterations produce tons
+                of subset shapes).
+
+                @param rShape
+                Shape to play the animation on.
+
+                @param rAttrLayer
+                Attribute layer to change the animated values on.
+             */
+            virtual void setTargets( const AnimatableShapeSharedPtr&        rShape,
+                                     const ShapeAttributeLayerSharedPtr&    rAttrLayer ) = 0;
+        };
+
+        typedef ::std::shared_ptr< AnimationActivity > AnimationActivitySharedPtr;
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_ANIMATIONACTIVITY_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */