svtools/source/notify/listener.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_svtools.hxx"
  33 #ifndef GCC
  34 #endif
  35
  36 #ifndef DEBUG_HXX
  37 #include <tools/debug.hxx>
  38 #endif
  39
  40 #include "broadcast.hxx"
  41 #include "listener.hxx"
  42 #include "listenerbase.hxx"
  43 #include "listeneriter.hxx"
  44
  45
  46 //====================================================================
  47 TYPEINIT0(SvtListener);
  48
  49 //====================================================================
  50 // simple ctor of class SvtListener
  51
  52 SvtListener::SvtListener()
  53     : pBrdCastLst( 0 )
  54 {
  55 }
  56 //--------------------------------------------------------------------
  57
  58 // copy ctor of class SvtListener
  59
  60 SvtListener::SvtListener( const SvtListener &rListener )
  61     : pBrdCastLst( 0 )
  62 {
  63     SvtListenerBase* pLst = rListener.pBrdCastLst;
  64     while( pLst )
  65     {
  66         new SvtListenerBase( *this, *pLst->GetBroadcaster() );
  67         pLst = pLst->GetNext();
  68     }
  69 }
  70 //--------------------------------------------------------------------
  71
  72 // unregisteres the SvtListener from its SvtBroadcasters
  73
  74 SvtListener::~SvtListener()
  75 {
  76     EndListeningAll();
  77 }
  78
  79 //--------------------------------------------------------------------
  80
  81 // registeres at a specific SvtBroadcaster
  82
  83 BOOL SvtListener::StartListening( SvtBroadcaster& rBroadcaster )
  84 {
  85     const SvtListenerBase* pLst = pBrdCastLst;
  86     while( pLst )
  87     {
  88         if( &rBroadcaster == pLst->GetBroadcaster() )
  89         {
  90             // double, than return
  91             return FALSE;
  92         }
  93         pLst = pLst->GetNext();
  94     }
  95     new SvtListenerBase( *this, rBroadcaster );
  96     return TRUE;
  97 }
  98
  99 //--------------------------------------------------------------------
 100
 101 // unregisteres at a specific SvtBroadcaster
 102
 103 BOOL SvtListener::EndListening( SvtBroadcaster& rBroadcaster )
 104 {
 105     SvtListenerBase *pLst = pBrdCastLst, *pPrev = pLst;
 106     while( pLst )
 107     {
 108         if( &rBroadcaster == pLst->GetBroadcaster() )
 109         {
 110             if( pBrdCastLst == pLst )
 111                 pBrdCastLst = pLst->GetNext();
 112             else
 113                 pPrev->SetNext( pLst->GetNext() );
 114
 115             delete pLst;
 116             return TRUE;
 117         }
 118         pPrev = pLst;
 119         pLst = pLst->GetNext();
 120     }
 121     return FALSE;
 122 }
 123
 124 //--------------------------------------------------------------------
 125
 126 // unregisteres all Broadcasters
 127
 128 void SvtListener::EndListeningAll()
 129 {
 130     SvtListenerBase *pLst = pBrdCastLst;
 131     while( pLst )
 132     {
 133         SvtListenerBase *pDel = pLst;
 134         pLst = pLst->GetNext();
 135
 136         delete pDel;
 137     }
 138     pBrdCastLst = 0;
 139 }
 140
 141 //--------------------------------------------------------------------
 142
 143 BOOL SvtListener::IsListening( SvtBroadcaster& rBroadcaster ) const
 144 {
 145     const SvtListenerBase *pLst = pBrdCastLst;
 146     while( pLst )
 147     {
 148         if( &rBroadcaster == pLst->GetBroadcaster() )
 149             break;
 150         pLst = pLst->GetNext();
 151     }
 152     return 0 != pLst;
 153 }
 154
 155 //--------------------------------------------------------------------
 156
 157 // base implementation of notification handler
 158
 159 void SvtListener::Notify( SvtBroadcaster&
 160 #ifdef DBG_UTIL
 161 rBC
 162 #endif
 163 , const SfxHint& )
 164 {
 165     DBG_ASSERT( IsListening( rBC ),
 166                 "notification from unregistered broadcaster" );
 167 }
 168
 169