comphelper/source/misc/weakeventlistener.cxx

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  27
  28 // MARKER(update_precomp.py): autogen include statement, do not remove
  29 #include "precompiled_comphelper.hxx"
  30 #include <comphelper/weakeventlistener.hxx>
  31 #include <osl/diagnose.h>
  32
  33
  34 //.........................................................................
  35 namespace comphelper
  36 {
  37 //.........................................................................
  38
  39     using namespace ::com::sun::star::uno;
  40     using namespace ::com::sun::star::lang;
  41
  42     //=====================================================================
  43     //= OWeakListenerAdapter
  44     //=====================================================================
  45     //---------------------------------------------------------------------
  46     OWeakListenerAdapterBase::~OWeakListenerAdapterBase()
  47     {
  48     }
  49
  50     //=====================================================================
  51     //= OWeakEventListenerAdapter
  52     //=====================================================================
  53     //---------------------------------------------------------------------
  54     OWeakEventListenerAdapter::OWeakEventListenerAdapter( Reference< XWeak > _rxListener, Reference< XComponent > _rxBroadcaster )
  55         :OWeakEventListenerAdapter_Base( _rxListener, _rxBroadcaster )
  56     {
  57         // add ourself as listener to the broadcaster
  58         OSL_ENSURE( _rxBroadcaster.is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid broadcaster!" );
  59         if ( _rxBroadcaster.is() )
  60         {
  61             osl_incrementInterlockedCount( &m_refCount );
  62             {
  63                 _rxBroadcaster->addEventListener( this );
  64             }
  65             osl_decrementInterlockedCount( &m_refCount );
  66             OSL_ENSURE( m_refCount > 0, "OWeakEventListenerAdapter::OWeakEventListenerAdapter: oops - not to be used with implementations which hold their listeners weak!" );
  67                 // the one and only reason for this adapter class (A) is to add as listener to a component (C) which
  68                 // holds its listeners hard, and forward all calls then to another listener (L) which is
  69                 // held weak by A.
  70                 // Now if C holds listeners weak, then we do not need A, we can add L directly to C.
  71         }
  72
  73         OSL_ENSURE( getListener().is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid listener (does not support the XEventListener interface)!" );
  74     }
  75
  76     //---------------------------------------------------------------------
  77     void SAL_CALL OWeakEventListenerAdapter::disposing( )
  78     {
  79         Reference< XComponent > xBroadcaster( getBroadcaster( ), UNO_QUERY );
  80         OSL_ENSURE( xBroadcaster.is(), "OWeakEventListenerAdapter::disposing: broadcaster is invalid in the meantime! How this?" );
  81         if ( xBroadcaster.is() )
  82         {
  83             xBroadcaster->removeEventListener( this );
  84         }
  85
  86         resetListener();
  87     }
  88
  89 //.........................................................................
  90 }   // namespace comphelper
  91 //.........................................................................
  92
  93