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diff --git a/slideshow/source/engine/activities/simplecontinuousactivitybase.hxx b/slideshow/source/engine/activities/simplecontinuousactivitybase.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * 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_SIMPLECONTINUOUSACTIVITYBASE_HXX
+#define INCLUDED_SLIDESHOW_SIMPLECONTINUOUSACTIVITYBASE_HXX
+
+#include "activitybase.hxx"
+#include <canvas/elapsedtime.hxx>
+
+namespace slideshow
+{
+    namespace internal
+    {
+        /** Simple, continuous animation.
+
+            This class implements a simple, continuous animation
+            without considering repeats or acceleration on the
+            perform call. Only useful as a base class, you
+            probably want to use ContinuousActivityBase.
+        */
+        class SimpleContinuousActivityBase : public ActivityBase
+        {
+        public:
+            SimpleContinuousActivityBase( const ActivityParameters& rParms );
+
+            virtual double calcTimeLag() const;
+            virtual bool perform();
+
+        protected:
+            /** Hook for derived classes
+
+                This method will be called from perform().
+
+                @param nSimpleTime
+                Simple animation time, without repeat,
+                acceleration or deceleration applied. This value
+                is always in the [0,1] range, the repeat is
+                accounted for with the nRepeatCount parameter.
+
+                @param nRepeatCount
+                Number of full repeats already performed
+            */
+            virtual void simplePerform( double nSimpleTime, sal_uInt32 nRepeatCount ) const = 0;
+
+            virtual void startAnimation();
+
+        private:
+            /// Time elapsed since activity started
+            ::canvas::tools::ElapsedTime    maTimer;
+
+            /// Simple duration of activity
+            const double                    mnMinSimpleDuration;
+
+            /// Minimal number of frames to show (see ActivityParameters)
+            const sal_uInt32                mnMinNumberOfFrames;
+
+            /// Actual number of frames shown until now.
+            sal_uInt32                      mnCurrPerformCalls;
+        };
+    }
+}
+
+#endif /* INCLUDED_SLIDESHOW_SIMPLECONTINUOUSACTIVITYBASE_HXX */
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */