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diff --git a/sd/inc/undo/undomanager.hxx b/sd/inc/undo/undomanager.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 _SD_UNDOMANAGER_HXX
+#define _SD_UNDOMANAGER_HXX
+
+#include "misc/scopelock.hxx"
+#include <svl/undo.hxx>
+
+namespace sd
+{
+
+class UndoManager : public SfxUndoManager
+{
+public:
+    UndoManager( USHORT nMaxUndoActionCount = 20 );
+
+    virtual void            EnterListAction(const UniString &rComment, const UniString& rRepeatComment, USHORT nId=0);
+    virtual void            LeaveListAction();
+
+    virtual void            AddUndoAction( SfxUndoAction *pAction, BOOL bTryMerg=FALSE );
+
+    bool                    isInListAction() const { return mnListLevel != 0; }
+    bool                    isInUndo() const { return maIsInUndoLock.isLocked(); }
+
+    virtual BOOL            Undo( USHORT nCount=1 );
+    virtual BOOL            Redo( USHORT nCount=1 );
+
+    /** Set or reset the undo manager linked with the called undo manager.
+    */
+    void SetLinkedUndoManager (SfxUndoManager* pLinkedUndoManager);
+
+private:
+    using SfxUndoManager::Undo;
+    using SfxUndoManager::Redo;
+
+    int mnListLevel;
+    ScopeLock maIsInUndoLock;
+
+    /** Used when the outline view is visible as a last resort to
+        synchronize the undo managers.
+    */
+    SfxUndoManager* mpLinkedUndoManager;
+
+    /** Call ClearRedo() at the linked undo manager, when present.
+
+        It should not be necessary to call ClearRedo() explicitly, but the
+        synchronization between the under managers of the document and the
+        outline view seems to have a bug.  Therefore this method is called
+        whenever a new undo action is added.
+    */
+    void ClearLinkedRedoActions (void);
+};
+
+}
+
+#endif     // _SD_UNDOMANAGER_HXX