vcl/inc/impdel.hxx

   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 <algorithm>
  24 #include <vector>
  25
  26 namespace vcl
  27 {
  28
  29 class DeletionListener;
  30
  31 class DeletionNotifier
  32 {
  33     std::vector< DeletionListener* > m_aListeners;
  34     protected:
  35     DeletionNotifier() {}
  36
  37     ~DeletionNotifier()
  38     { notifyDelete(); }
  39
  40     inline void notifyDelete();
  41
  42     public:
  43     void addDel( DeletionListener* pListener )
  44     { m_aListeners.push_back( pListener ); }
  45
  46     void removeDel( DeletionListener* pListener )
  47     { std::erase(m_aListeners, pListener); }
  48 };
  49
  50 class DeletionListener
  51 {
  52     DeletionNotifier*  m_pNotifier;
  53     public:
  54     DeletionListener( DeletionNotifier* pNotifier )
  55     :  m_pNotifier( pNotifier )
  56        {
  57            if( m_pNotifier )
  58                m_pNotifier->addDel( this );
  59        }
  60     DeletionListener(const DeletionListener& rOther)
  61     :  m_pNotifier(rOther.m_pNotifier)
  62        {
  63            if (m_pNotifier)
  64                m_pNotifier->addDel(this);
  65        }
  66    ~DeletionListener()
  67    {
  68        if( m_pNotifier )
  69            m_pNotifier->removeDel( this );
  70    }
  71    void deleted() { m_pNotifier = nullptr; }
  72    bool isDeleted() const { return (m_pNotifier == nullptr); }
  73 };
  74
  75 inline void DeletionNotifier::notifyDelete()
  76 {
  77     for( auto& rListener : m_aListeners )
  78        rListener->deleted();
  79
  80     m_aListeners.clear();
  81 }
  82
  83 } // namespace vcl
  84
  85 #endif // INCLUDED_VCL_IMPDEL_HXX
  86
  87 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */