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diff --git a/sd/source/ui/inc/MasterPageObserver.hxx b/sd/source/ui/inc/MasterPageObserver.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 SD_VIEW_MASTER_PAGE_OBSERVER_HXX
+#define SD_VIEW_MASTER_PAGE_OBSERVER_HXX
+
+#include "tools/SdGlobalResourceContainer.hxx"
+#include <osl/mutex.hxx>
+#include <tools/link.hxx>
+#include <memory>
+#include <set>
+
+class SdDrawDocument;
+class String;
+
+namespace sd {
+
+/** This singleton observes all registered documents for changes in the used
+    master pages and in turn informs its listeners about it.  One such
+    listener is the master page selector control in the tool panel that
+    shows the recently used master pages.
+*/
+class MasterPageObserver
+    : public SdGlobalResource
+{
+public:
+    typedef ::std::set<String> MasterPageNameSet;
+
+    /** Return the single instance of this class.
+    */
+    static MasterPageObserver& Instance (void);
+
+    /** The master page observer will listen to events of this document and
+        detect changes of the use of master pages.
+    */
+    void RegisterDocument (SdDrawDocument& rDocument);
+
+    /** The master page observer will stop to listen to events of this
+        document.
+    */
+    void UnregisterDocument (SdDrawDocument& rDocument);
+
+    /** Add a listener that is informed of master pages that are newly
+        assigned to slides or become unassigned.
+        @param rEventListener
+            The event listener to call for future events.  Call
+            RemoveEventListener() before the listener is destroyed.
+    */
+    void AddEventListener (const Link& rEventListener);
+
+    /** Remove the given listener from the list of listeners.
+        @param rEventListener
+            After this method returns the given listener is not called back
+            from this object.  Passing a listener that has not
+            been registered before is safe and is silently ignored.
+    */
+    void RemoveEventListener (const Link& rEventListener);
+
+private:
+    static ::osl::Mutex maMutex;
+
+    class Implementation;
+    ::std::auto_ptr<Implementation> mpImpl;
+
+    MasterPageObserver (void);
+    virtual ~MasterPageObserver (void);
+
+    /// The copy constructor is not implemented.  Do not use!
+    MasterPageObserver (const MasterPageObserver&);
+
+    /// The assignment operator is not implemented.  Do not use!
+    MasterPageObserver& operator= (const MasterPageObserver&);
+};
+
+
+
+
+/** Objects of this class are sent to listeners of the MasterPageObserver
+    singleton when the list of master pages of one document has changed.
+*/
+class MasterPageObserverEvent
+{
+public:
+    enum EventType {
+        /// Master page already exists when document is registered.
+        ET_MASTER_PAGE_EXISTS,
+        /// Master page has been added to a document.
+        ET_MASTER_PAGE_ADDED,
+        /// Master page has been removed from to a document.
+        ET_MASTER_PAGE_REMOVED
+    };
+
+    EventType meType;
+    SdDrawDocument& mrDocument;
+    const String& mrMasterPageName;
+
+    MasterPageObserverEvent (
+        EventType eType,
+        SdDrawDocument& rDocument,
+        const String& rMasterPageName)
+        : meType(eType),
+          mrDocument(rDocument),
+          mrMasterPageName(rMasterPageName)
+    {}
+
+};
+
+} // end of namespace sd
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */