comphelper/source/misc/weakeventlistener.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_comphelper.hxx"
  33 #include <comphelper/weakeventlistener.hxx>
  34 #include <osl/diagnose.h>
  35
  36
  37 //.........................................................................
  38 namespace comphelper
  39 {
  40 //.........................................................................
  41
  42     using namespace ::com::sun::star::uno;
  43     using namespace ::com::sun::star::lang;
  44
  45     //=====================================================================
  46     //= OWeakListenerAdapter
  47     //=====================================================================
  48     //---------------------------------------------------------------------
  49     OWeakListenerAdapterBase::~OWeakListenerAdapterBase()
  50     {
  51     }
  52
  53     //=====================================================================
  54     //= OWeakEventListenerAdapter
  55     //=====================================================================
  56     //---------------------------------------------------------------------
  57     OWeakEventListenerAdapter::OWeakEventListenerAdapter( Reference< XWeak > _rxListener, Reference< XComponent > _rxBroadcaster )
  58         :OWeakEventListenerAdapter_Base( _rxListener, _rxBroadcaster )
  59     {
  60         // add ourself as listener to the broadcaster
  61         OSL_ENSURE( _rxBroadcaster.is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid broadcaster!" );
  62         if ( _rxBroadcaster.is() )
  63         {
  64             osl_incrementInterlockedCount( &m_refCount );
  65             {
  66                 _rxBroadcaster->addEventListener( this );
  67             }
  68             osl_decrementInterlockedCount( &m_refCount );
  69             OSL_ENSURE( m_refCount > 0, "OWeakEventListenerAdapter::OWeakEventListenerAdapter: oops - not to be used with implementations which hold their listeners weak!" );
  70                 // the one and only reason for this adapter class (A) is to add as listener to a component (C) which
  71                 // holds its listeners hard, and forward all calls then to another listener (L) which is
  72                 // held weak by A.
  73                 // Now if C holds listeners weak, then we do not need A, we can add L directly to C.
  74         }
  75
  76         OSL_ENSURE( getListener().is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid listener (does not support the XEventListener interface)!" );
  77     }
  78
  79     //---------------------------------------------------------------------
  80     void SAL_CALL OWeakEventListenerAdapter::disposing( )
  81     {
  82         Reference< XComponent > xBroadcaster( getBroadcaster( ), UNO_QUERY );
  83         OSL_ENSURE( xBroadcaster.is(), "OWeakEventListenerAdapter::disposing: broadcaster is invalid in the meantime! How this?" );
  84         if ( xBroadcaster.is() )
  85         {
  86             xBroadcaster->removeEventListener( this );
  87         }
  88
  89         resetListener();
  90     }
  91
  92 //.........................................................................
  93 }       // namespace comphelper
  94 //.........................................................................
  95
  96