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diff --git a/slideshow/source/inc/viewupdate.hxx b/slideshow/source/inc/viewupdate.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_VIEWUPDATE_HXX
+#define INCLUDED_SLIDESHOW_VIEWUPDATE_HXX
+
+#include "disposable.hxx"
+#include "view.hxx"
+#include <boost/shared_ptr.hpp>
+
+/* Definition of ViewUpdate interface */
+
+namespace slideshow
+{
+    namespace internal
+    {
+        /** Interface for something that can perform view updates.
+
+            Use this interface for objects that perform view updates
+            from time to time, e.g. slide content. Availability of
+            updates can be queried, and subsequently performed.
+         */
+        class ViewUpdate : public Disposable
+        {
+        public:
+            /** Perform the update action on all views
+
+                @return true, if the update was performed
+                successfully, false otherwise.
+             */
+            virtual bool update() = 0;
+
+            /** Perform the update action on given view only
+
+                @return true, if the update was performed
+                successfully, false otherwise.
+             */
+            virtual bool update( ViewSharedPtr const& rView ) = 0;
+
+            /** Query whether updates are pending
+
+                @return true, if updates are pending. Calling update()
+                subsequently will perform the pending update then.
+             */
+            virtual bool needsUpdate() const = 0;
+        };
+
+        typedef ::boost::shared_ptr< ViewUpdate > ViewUpdateSharedPtr;
+    }
+}
+
+#endif /* INCLUDED_SLIDESHOW_VIEWUPDATE_HXX */