unotools/source/misc/eventlisteneradapter.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   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 #include <sal/config.h>
  21
  22 #include <vector>
  23
  24 #include <unotools/eventlisteneradapter.hxx>
  25 #include <osl/diagnose.h>
  26 #include <cppuhelper/implbase1.hxx>
  27
  28 namespace utl
  29 {
  30
  31     using namespace ::com::sun::star::uno;
  32     using namespace ::com::sun::star::lang;
  33
  34     //= OEventListenerImpl
  35
  36     class OEventListenerImpl : public ::cppu::WeakImplHelper1< XEventListener >
  37     {
  38     protected:
  39         OEventListenerAdapter*          m_pAdapter;
  40         Reference< XEventListener >     m_xKeepMeAlive;
  41             // imagine an implementation of XComponent which holds it's listeners with a weak reference ...
  42             // would be very bad if we don't hold ourself
  43         Reference< XComponent >         m_xComponent;
  44
  45     public:
  46         OEventListenerImpl( OEventListenerAdapter* _pAdapter, const Reference< XComponent >& _rxComp );
  47
  48         void                            dispose();
  49         const Reference< XComponent >&  getComponent() const { return m_xComponent; }
  50
  51     protected:
  52         virtual void SAL_CALL disposing( const EventObject& _rSource ) throw (RuntimeException, std::exception) SAL_OVERRIDE;
  53     };
  54
  55     OEventListenerImpl::OEventListenerImpl( OEventListenerAdapter* _pAdapter, const Reference< XComponent >& _rxComp )
  56         :m_pAdapter(_pAdapter)
  57     {
  58         OSL_ENSURE(m_pAdapter, "OEventListenerImpl::OEventListenerImpl: invalid adapter!");
  59         // no checks of _rxComp !!
  60         // (OEventListenerAdapter is responsible for this)
  61
  62         // just in case addEventListener throws an exception ... don't initialize m_xKeepMeAlive before this
  63         // is done
  64         Reference< XEventListener > xMeMyselfAndI = this;
  65         _rxComp->addEventListener(xMeMyselfAndI);
  66
  67         m_xComponent = _rxComp;
  68         m_xKeepMeAlive = xMeMyselfAndI;
  69     }
  70
  71     void OEventListenerImpl::dispose()
  72     {
  73         if (m_xComponent.is())
  74         {
  75             m_xComponent->removeEventListener(m_xKeepMeAlive);
  76             m_xComponent.clear();
  77             m_xKeepMeAlive.clear();
  78         }
  79     }
  80
  81     void SAL_CALL OEventListenerImpl::disposing( const EventObject& _rSource ) throw (RuntimeException, std::exception)
  82     {
  83         Reference< XEventListener > xDeleteUponLeaving = m_xKeepMeAlive;
  84         m_xKeepMeAlive.clear();
  85         m_xComponent.clear();
  86
  87         m_pAdapter->_disposing(_rSource);
  88     }
  89
  90     //= OEventListenerAdapterImpl
  91
  92     struct OEventListenerAdapterImpl
  93     {
  94     public:
  95         ::std::vector< void* >  aListeners;
  96     };
  97
  98     //= OEventListenerAdapter
  99
 100     OEventListenerAdapter::OEventListenerAdapter()
 101         :m_pImpl(new OEventListenerAdapterImpl)
 102     {
 103     }
 104
 105     OEventListenerAdapter::~OEventListenerAdapter()
 106     {
 107         stopAllComponentListening( );
 108         delete m_pImpl;
 109         m_pImpl = NULL;
 110     }
 111
 112     void OEventListenerAdapter::stopComponentListening( const ::com::sun::star::uno::Reference< ::com::sun::star::lang::XComponent >& _rxComp )
 113     {
 114         if ( m_pImpl->aListeners.empty() )
 115             return;
 116
 117         ::std::vector< void* >::iterator dispose = m_pImpl->aListeners.begin();
 118         do
 119         {
 120             OEventListenerImpl* pListenerImpl = static_cast< OEventListenerImpl* >( *dispose );
 121             if ( pListenerImpl->getComponent().get() == _rxComp.get() )
 122             {
 123                 pListenerImpl->dispose();
 124                 pListenerImpl->release();
 125                 dispose = m_pImpl->aListeners.erase( dispose );
 126             }
 127             else
 128                 ++dispose;
 129         }
 130         while ( dispose != m_pImpl->aListeners.end() );
 131     }
 132
 133     void OEventListenerAdapter::stopAllComponentListening(  )
 134     {
 135         for (   ::std::vector< void* >::const_iterator aDisposeLoop = m_pImpl->aListeners.begin();
 136                 aDisposeLoop != m_pImpl->aListeners.end();
 137                 ++aDisposeLoop
 138             )
 139         {
 140             OEventListenerImpl* pListenerImpl = static_cast< OEventListenerImpl* >(*aDisposeLoop);
 141             pListenerImpl->dispose();
 142             pListenerImpl->release();
 143         }
 144         m_pImpl->aListeners.clear();
 145     }
 146
 147     void OEventListenerAdapter::startComponentListening( const Reference< XComponent >& _rxComp )
 148     {
 149         if (!_rxComp.is())
 150         {
 151             OSL_FAIL("OEventListenerAdapter::startComponentListening: invalid component!");
 152             return;
 153         }
 154
 155         OEventListenerImpl* pListenerImpl = new OEventListenerImpl(this, _rxComp);
 156         pListenerImpl->acquire();
 157         m_pImpl->aListeners.push_back(pListenerImpl);
 158     }
 159
 160 }   // namespace utl
 161
 162 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */