Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             :  #ifndef INCLUDED_VCL_IMPDEL_HXX
      21             :  #define INCLUDED_VCL_IMPDEL_HXX
      22             : 
      23             :  #include <list>
      24             : 
      25             :  namespace vcl
      26             :  {
      27             : 
      28             :  class DeletionListener;
      29             : 
      30             :  class DeletionNotifier
      31             :  {
      32             :      std::list< DeletionListener* > m_aListeners;
      33             :      protected:
      34           0 :      DeletionNotifier() {}
      35             : 
      36           0 :      ~DeletionNotifier()
      37           0 :      { notifyDelete(); }
      38             : 
      39             :      inline void notifyDelete();
      40             : 
      41             :      public:
      42           0 :      void addDel( DeletionListener* pListener )
      43           0 :      { m_aListeners.push_back( pListener ); }
      44             : 
      45           0 :      void removeDel( DeletionListener* pListener )
      46           0 :      { m_aListeners.remove( pListener ); }
      47             :  };
      48             : 
      49             :  class DeletionListener
      50             :  {
      51             :      DeletionNotifier*  m_pNotifier;
      52             :      public:
      53           0 :      DeletionListener( DeletionNotifier* pNotifier )
      54           0 :      :  m_pNotifier( pNotifier )
      55             :         {
      56           0 :             if( m_pNotifier )
      57           0 :                 m_pNotifier->addDel( this );
      58           0 :         }
      59           0 :     ~DeletionListener()
      60             :     {
      61           0 :         if( m_pNotifier )
      62           0 :             m_pNotifier->removeDel( this );
      63           0 :     }
      64           0 :     void deleted() { m_pNotifier = NULL; }
      65           0 :     bool isDeleted() const { return (m_pNotifier == NULL); }
      66             :  };
      67             : 
      68           0 :  inline void DeletionNotifier::notifyDelete()
      69             :  {
      70           0 :      for( std::list< DeletionListener* >::const_iterator it =
      71           0 :              m_aListeners.begin(); it != m_aListeners.end(); ++it )
      72           0 :         (*it)->deleted();
      73             : 
      74           0 :      m_aListeners.clear();
      75           0 :  }
      76             : 
      77             :  } // namespace vcl
      78             : 
      79             :  #endif // INCLUDED_VCL_IMPDEL_HXX
      80             : 
      81             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */