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diff --git a/slideshow/source/inc/activitiesqueue.hxx b/slideshow/source/inc/activitiesqueue.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
+ *
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+ *
+ * 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_ACTIVITIESQUEUE_HXX
+#define INCLUDED_SLIDESHOW_ACTIVITIESQUEUE_HXX
+
+#include <deque>
+
+#include "activity.hxx"
+#include "unoviewcontainer.hxx"
+
+#include <canvas/elapsedtime.hxx>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/utility.hpp> // for boost::noncopyable
+
+
+/* Definition of ActivitiesQueue class */
+
+namespace slideshow
+{
+    namespace internal
+    {
+        /** This class handles the XSprite updates needed for
+            animations, such as moves, scales etc. You can add
+            activity objects to this class, which are called in a
+            round-robin fashion.
+        */
+        class ActivitiesQueue : private ::boost::noncopyable
+        {
+        public:
+            /** Create an ActivitiesQueue.
+
+                @param pPresTimer
+                Pointer to global presentation timer. Used for
+                adjusting and holding global presentation time.
+             */
+            ActivitiesQueue(
+                const ::boost::shared_ptr< ::canvas::tools::ElapsedTime >&  pPresTimer );
+            ~ActivitiesQueue();
+
+            /** Add the given activity to the queue.
+             */
+            bool addActivity( const ActivitySharedPtr& pActivity );
+
+            /** Process the activities queue.
+
+                This method performs the smallest atomic processing
+                possible on the queue (typically, this means one
+                activity get processed).
+             */
+            void process();
+
+            /** Call all dequeued activities' dequeued() method
+             */
+            void processDequeued();
+
+            /** Query state of the queue
+
+                @return false, if queue is empty, true otherwise
+             */
+            bool isEmpty() const;
+
+            /** Remove all pending activities from the queue.
+             */
+            void clear();
+
+            /** Gets the queue's timer object.
+             */
+            ::boost::shared_ptr< ::canvas::tools::ElapsedTime > const &
+            getTimer() const { return mpTimer; }
+
+            /** returns number of all activities, waiting, reinserted and dequeued
+             */
+            std::size_t size() const
+            {
+                return maCurrentActivitiesWaiting.size() + maCurrentActivitiesReinsert.size() + maDequeuedActivities.size();
+            }
+
+        private:
+            ::boost::shared_ptr< ::canvas::tools::ElapsedTime > mpTimer;
+
+            typedef ::std::deque< ActivitySharedPtr > ActivityQueue;
+
+            ActivityQueue           maCurrentActivitiesWaiting;  // currently running
+                                                                 // activities, that still
+                                                                 // await processing for this
+                                                                 // round
+
+            ActivityQueue           maCurrentActivitiesReinsert;    // currently running
+                                                                      // activities, that are
+                                                                      // already processed for
+                                                                      // this round, and wants
+                                                                    // to be reinserted next
+                                                                    // round
+
+            ActivityQueue           maDequeuedActivities; // This list collects all activities which did not request
+                                                          // a reinsertion. After the screen update has been
+                                                          // performed, those are notified via dequeued(). This
+                                                          // facilitates cleanup actions taking place _after_ the
+                                                          // current frame has been displayed.
+        };
+
+    }
+}
+#endif /* INCLUDED_SLIDESHOW_ACTIVITIESQUEUE_HXX */