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diff --git a/slideshow/source/inc/activity.hxx b/slideshow/source/inc/activity.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_ACTIVITY_HXX
+#define INCLUDED_SLIDESHOW_ACTIVITY_HXX
+
+#include <sal/types.h>
+
+#include <boost/shared_ptr.hpp>
+
+#include "disposable.hxx"
+
+
+/* Definition of Activity interface */
+
+namespace slideshow
+{
+    namespace internal
+    {
+
+        class Activity : public Disposable
+        {
+        public:
+            /** Perform the activity associated with this interface's
+                implementation.
+
+                @return true, if activity continues, or false, if activity has
+                ended.
+            */
+            virtual bool perform() = 0;
+
+            /** Calculates whether the activity lags time.
+
+                If this method returns a time lag greater than 0.0,
+                the ActivitiesQueue will adjust the global slideshow
+                time, by subtracting the given amount of lag.
+
+                @return time lag or 0.0. Value must be greater or
+                equal than zero.
+            */
+            virtual double calcTimeLag() const = 0;
+
+            /** Query whether this activity is still continuing
+
+                @return true, if this activity still
+                continues. Returns false, if activity has ended. It is
+                required that operator() returns false, when
+                isActive() returns false. Furthermore, it is required
+                that the inactive state is persistent; an activity
+                that has become inactive (i.e. isActive() once
+                returned false) must stay in that state eternally.
+            */
+            virtual bool isActive() const = 0;
+
+            /** Notifies the Activity that it has now left the
+                ActivitiesQueue
+
+                Use this method to react on the queue removal
+                event. For animated shapes, this is e.g. used to
+                switch back to the non-sprite presentation mode of the
+                shape.
+             */
+            virtual void dequeued() = 0;
+
+            /** Forces this activity deactivate and get to its end state
+                (if possible), but does _not_ dispose.
+            */
+            virtual void end() = 0;
+        };
+
+        typedef ::boost::shared_ptr< Activity > ActivitySharedPtr;
+
+    }
+}
+
+#endif /* INCLUDED_SLIDESHOW_ACTIVITY_HXX */