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diff --git a/slideshow/source/engine/activities/continuousactivitybase.hxx b/slideshow/source/engine/activities/continuousactivitybase.hxx
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef INCLUDED_SLIDESHOW_CONTINUOUSACTIVITYBASE_HXX
+#define INCLUDED_SLIDESHOW_CONTINUOUSACTIVITYBASE_HXX
+
+#include "simplecontinuousactivitybase.hxx"
+
+namespace slideshow
+{
+    namespace internal
+    {
+        /** Simple, continuous animation.
+
+            This class implements a simple, continuous
+            animation. Only addition to ActivityBase class is an
+            explicit animation duration and a minimal number of
+            frames to display.
+        */
+        class ContinuousActivityBase : public SimpleContinuousActivityBase
+        {
+        public:
+            ContinuousActivityBase( 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 nModifiedTime
+                Already accelerated/decelerated and repeated time, always
+                in the [0,1] range.
+
+                @param nRepeatCount
+                Number of full repeats already performed
+            */
+            virtual void perform( double nModifiedTime, sal_uInt32 nRepeatCount ) const = 0;
+
+            /// From SimpleContinuousActivityBase class
+            virtual void simplePerform( double      nSimpleTime,
+                                        sal_uInt32  nRepeatCount ) const;
+        };
+    }
+}
+
+#endif /* INCLUDED_SLIDESHOW_CONTINUOUSACTIVITYBASE_HXX */