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diff --git a/sd/source/ui/inc/MasterPageObserver.hxx b/sd/source/ui/inc/MasterPageObserver.hxx
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+++ b/sd/source/ui/inc/MasterPageObserver.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <rtl/ustring.hxx>
+#include <tools/link.hxx>
+#include "tools/SdGlobalResourceContainer.hxx"
+#include <memory>
+#include <set>
+
+namespace osl
+{
+class Mutex;
+}
+
+class SdDrawDocument;
+
+namespace sd
+{
+class MasterPageObserverEvent;
+
+/** 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 final : public SdGlobalResource
+{
+public:
+    typedef ::std::set<OUString> MasterPageNameSet;
+
+    /** Return the single instance of this class.
+    */
+    static MasterPageObserver& Instance();
+
+    /** 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<MasterPageObserverEvent&, void>& 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<MasterPageObserverEvent&, void>& rEventListener);
+
+private:
+    class Implementation;
+    ::std::unique_ptr<Implementation> mpImpl;
+
+    MasterPageObserver();
+    virtual ~MasterPageObserver() override;
+
+    MasterPageObserver(const MasterPageObserver&) = delete;
+
+    MasterPageObserver& operator=(const MasterPageObserver&) = delete;
+};
+
+/** 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;
+    const OUString& mrMasterPageName;
+
+    MasterPageObserverEvent(EventType eType, const OUString& rMasterPageName)
+        : meType(eType)
+        , mrMasterPageName(rMasterPageName)
+    {
+    }
+};
+
+} // end of namespace sd
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */