1 files changed, 81 insertions, 0 deletions
diff --git a/include/vcl/impdel.hxx b/include/vcl/impdel.hxx
new file mode 100644
index 000000000000..df6e2713196e
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+++ b/include/vcl/impdel.hxx
@@ -0,0 +1,81 @@
+/* -*- 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 .
+ */
+
+ #ifndef _VCL_IMPDEL_HXX
+ #define _VCL_IMPDEL_HXX
+
+ #include <list>
+
+ namespace vcl
+ {
+
+ class DeletionListener;
+
+ class DeletionNotifier
+ {
+     std::list< DeletionListener* > m_aListeners;
+     protected:
+     DeletionNotifier() {}
+
+     ~DeletionNotifier()
+     { notifyDelete(); }
+
+     inline void notifyDelete();
+
+     public:
+     void addDel( DeletionListener* pListener )
+     { m_aListeners.push_back( pListener ); }
+
+     void removeDel( DeletionListener* pListener )
+     { m_aListeners.remove( pListener ); }
+ };
+
+ class DeletionListener
+ {
+     DeletionNotifier*  m_pNotifier;
+     public:
+     DeletionListener( DeletionNotifier* pNotifier )
+     :  m_pNotifier( pNotifier )
+        {
+            if( m_pNotifier )
+                m_pNotifier->addDel( this );
+        }
+    ~DeletionListener()
+    {
+        if( m_pNotifier )
+            m_pNotifier->removeDel( this );
+    }
+    void deleted() { m_pNotifier = NULL; }
+    bool isDeleted() const { return (m_pNotifier == NULL); }
+ };
+
+ inline void DeletionNotifier::notifyDelete()
+ {
+     for( std::list< DeletionListener* >::const_iterator it =
+             m_aListeners.begin(); it != m_aListeners.end(); ++it )
+        (*it)->deleted();
+
+     m_aListeners.clear();
+ }
+
+ } // namespace vcl
+
+ #endif // _VCL_IMPDEL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */