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diff --git a/sd/source/ui/slidesorter/inc/controller/SlsSelectionObserver.hxx b/sd/source/ui/slidesorter/inc/controller/SlsSelectionObserver.hxx
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+++ b/sd/source/ui/slidesorter/inc/controller/SlsSelectionObserver.hxx
@@ -0,0 +1,85 @@
+/*************************************************************************
+ *
+ * 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 SD_SLIDESORTER_CONTROLLER_SELECTION_OBSERVER_HXX
+#define SD_SLIDESORTER_CONTROLLER_SELECTION_OBSERVER_HXX
+
+#include <tools/gen.hxx>
+#include <vector>
+#include <boost/shared_ptr.hpp>
+
+namespace sd { namespace slidesorter {
+class SlideSorter;
+} }
+
+class SdDrawDocument;
+class SdrPage;
+
+namespace sd { namespace slidesorter { namespace controller {
+
+/** Observe insertions and deletions of pages between calls to
+    StartObservation() and EndObservation().  When the later is called
+    the selection is set to just the newly inserted pages.
+*/
+class SelectionObserver
+{
+public:
+    SelectionObserver (SlideSorter& rSlideSorter);
+    virtual ~SelectionObserver (void);
+
+    void NotifyPageEvent (const SdrPage* pPage);
+    void StartObservation (void);
+    void AbortObservation (void);
+    void EndObservation (void);
+
+    /** Use this little class instead of calling StartObservation and
+        EndObservation directly so that EndObservation is not forgotten or
+        omitted due to an exception or some break or return in the middle of
+        code.
+    */
+    class Context
+    {
+    public:
+        Context (SlideSorter& rSlideSorter);
+        ~Context(void);
+        void Abort (void);
+    private:
+        ::boost::shared_ptr<SelectionObserver> mpSelectionObserver;
+    };
+
+private:
+    SlideSorter& mrSlideSorter;
+    SdDrawDocument* mpDocument;
+    bool mbIsOvservationActive;
+
+    ::std::vector<const SdPage*> maInsertedPages;
+    ::std::vector<sal_Int32> maDeletedPages;
+};
+
+} } } // end of namespace ::sd::slidesorter::controller
+
+#endif