chart2/source/tools/ModifyListenerHelper.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.
   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 #include <ModifyListenerHelper.hxx>
  21 #include <WeakListenerAdapter.hxx>
  22
  23 #include <tools/diagnose_ex.h>
  24
  25 using namespace ::com::sun::star;
  26
  27 using ::com::sun::star::uno::Reference;
  28
  29 namespace
  30 {
  31
  32 void lcl_fireModifyEvent(
  33     ::cppu::OBroadcastHelper const & rBroadcastHelper,
  34     const Reference< uno::XWeak > & xEventSource,
  35     const lang::EventObject * pEvent )
  36 {
  37     ::cppu::OInterfaceContainerHelper * pCntHlp = rBroadcastHelper.getContainer(
  38         cppu::UnoType<util::XModifyListener>::get());
  39     if( pCntHlp )
  40     {
  41         lang::EventObject aEventToSend;
  42         if( pEvent )
  43             aEventToSend = *pEvent;
  44         else
  45             aEventToSend.Source.set( xEventSource );
  46         OSL_ENSURE( aEventToSend.Source.is(), "Sending event without source" );
  47
  48         ::cppu::OInterfaceIteratorHelper aIt( *pCntHlp );
  49
  50         while( aIt.hasMoreElements())
  51         {
  52             Reference< util::XModifyListener > xModListener( aIt.next(), uno::UNO_QUERY );
  53             if( xModListener.is())
  54                 xModListener->modified( aEventToSend );
  55         }
  56     }
  57 }
  58
  59 struct lcl_weakReferenceToSame
  60 {
  61     explicit lcl_weakReferenceToSame( const Reference< util::XModifyListener > & xModListener ) :
  62             m_xHardRef( xModListener )
  63     {}
  64
  65     // argument type is same as tListenerMap::value_type&
  66     bool operator() ( const std::pair<css::uno::WeakReference< css::util::XModifyListener>,
  67                                       css::uno::Reference< css::util::XModifyListener> > & xElem )
  68     {
  69         Reference< util::XModifyListener > xWeakAsHard( xElem.first );
  70         if( xWeakAsHard.is())
  71             return (xWeakAsHard == m_xHardRef);
  72         return false;
  73     }
  74
  75 private:
  76     Reference< util::XModifyListener > m_xHardRef;
  77 };
  78
  79 } //  anonymous namespace
  80
  81 namespace chart
  82 {
  83 namespace ModifyListenerHelper
  84 {
  85
  86 uno::Reference< util::XModifyListener > createModifyEventForwarder()
  87 {
  88     return new ModifyEventForwarder();
  89 }
  90
  91 ModifyEventForwarder::ModifyEventForwarder() :
  92         ::cppu::WeakComponentImplHelper<
  93         css::util::XModifyBroadcaster,
  94         css::util::XModifyListener >( m_aMutex ),
  95         m_aModifyListeners( m_aMutex )
  96 {
  97 }
  98
  99 void ModifyEventForwarder::AddListener( const Reference< util::XModifyListener >& aListener )
 100 {
 101     try
 102     {
 103         Reference< util::XModifyListener > xListenerToAdd( aListener );
 104
 105         Reference< uno::XWeak > xWeak( aListener, uno::UNO_QUERY );
 106         if( xWeak.is())
 107         {
 108             // remember the helper class for later remove
 109             uno::WeakReference< util::XModifyListener > xWeakRef( aListener );
 110             xListenerToAdd.set( new WeakModifyListenerAdapter( xWeakRef ));
 111             m_aListenerMap.emplace_back( xWeakRef, xListenerToAdd );
 112         }
 113
 114         m_aModifyListeners.addListener( cppu::UnoType<decltype(xListenerToAdd)>::get(), xListenerToAdd );
 115     }
 116     catch( const uno::Exception &  )
 117     {
 118         DBG_UNHANDLED_EXCEPTION("chart2");
 119     }
 120 }
 121
 122 void ModifyEventForwarder::RemoveListener( const Reference< util::XModifyListener >& aListener )
 123 {
 124     try
 125     {
 126         // look up fitting helper class that has been added
 127         Reference< util::XModifyListener > xListenerToRemove( aListener );
 128         tListenerMap::iterator aIt(
 129             std::find_if( m_aListenerMap.begin(), m_aListenerMap.end(), lcl_weakReferenceToSame( aListener )));
 130         if( aIt != m_aListenerMap.end())
 131         {
 132             xListenerToRemove.set( (*aIt).second );
 133             // map entry is no longer needed
 134             m_aListenerMap.erase( aIt );
 135         }
 136
 137         m_aModifyListeners.removeListener( cppu::UnoType<decltype(aListener)>::get(), xListenerToRemove );
 138     }
 139     catch( const uno::Exception & )
 140     {
 141         DBG_UNHANDLED_EXCEPTION("chart2");
 142     }
 143 }
 144
 145 void ModifyEventForwarder::DisposeAndClear( const Reference< uno::XWeak > & xSource )
 146 {
 147     ::cppu::OInterfaceContainerHelper * pCntHlp = m_aModifyListeners.getContainer(
 148         cppu::UnoType<util::XModifyListener>::get());
 149     if( pCntHlp )
 150         pCntHlp->disposeAndClear( lang::EventObject( xSource ) );
 151 }
 152
 153 // ____ XModifyBroadcaster ____
 154 void SAL_CALL ModifyEventForwarder::addModifyListener( const Reference< util::XModifyListener >& aListener )
 155 {
 156     AddListener( aListener );
 157 }
 158
 159 void SAL_CALL ModifyEventForwarder::removeModifyListener( const Reference< util::XModifyListener >& aListener )
 160 {
 161     RemoveListener( aListener );
 162 }
 163
 164 // ____ XModifyListener ____
 165 void SAL_CALL ModifyEventForwarder::modified( const lang::EventObject& aEvent )
 166 {
 167    lcl_fireModifyEvent( m_aModifyListeners, Reference< uno::XWeak >(), &aEvent );
 168 }
 169
 170 // ____ XEventListener (base of XModifyListener) ____
 171 void SAL_CALL ModifyEventForwarder::disposing( const lang::EventObject& /* Source */ )
 172 {
 173     // nothing
 174 }
 175
 176 // ____ WeakComponentImplHelperBase ____
 177 void SAL_CALL ModifyEventForwarder::disposing()
 178 {
 179     // dispose was called at this
 180     DisposeAndClear( this );
 181 }
 182
 183 } //  namespace ModifyListenerHelper
 184 } //  namespace chart
 185
 186 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */