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: DeletionNotifier()34 DeletionNotifier() {} 35 ~DeletionNotifier()36 ~DeletionNotifier() 37 { notifyDelete(); } 38 39 inline void notifyDelete(); 40 41 public: addDel(DeletionListener * pListener)42 void addDel( DeletionListener* pListener ) 43 { m_aListeners.push_back( pListener ); } 44 removeDel(DeletionListener * pListener)45 void removeDel( DeletionListener* pListener ) 46 { m_aListeners.remove( pListener ); } 47 }; 48 49 class DeletionListener 50 { 51 DeletionNotifier* m_pNotifier; 52 public: DeletionListener(DeletionNotifier * pNotifier)53 DeletionListener( DeletionNotifier* pNotifier ) 54 : m_pNotifier( pNotifier ) 55 { 56 if( m_pNotifier ) 57 m_pNotifier->addDel( this ); 58 } ~DeletionListener()59 ~DeletionListener() 60 { 61 if( m_pNotifier ) 62 m_pNotifier->removeDel( this ); 63 } deleted()64 void deleted() { m_pNotifier = nullptr; } isDeleted() const65 bool isDeleted() const { return (m_pNotifier == nullptr); } 66 }; 67 notifyDelete()68inline void DeletionNotifier::notifyDelete() 69 { 70 for( auto& rListener : m_aListeners ) 71 rListener->deleted(); 72 73 m_aListeners.clear(); 74 } 75 76 } // namespace vcl 77 78 #endif // INCLUDED_VCL_IMPDEL_HXX 79 80 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */ 81