LibreOffice Module comphelper (master) 1
weakeventlistener.cxx
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1/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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9 * This file incorporates work covered by the following license notice:
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17 * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 */
19
21#include <osl/diagnose.h>
22
23
24namespace comphelper
25{
26
27
28 using namespace ::com::sun::star::uno;
29 using namespace ::com::sun::star::lang;
30
32 {
33 }
34
35 OWeakEventListenerAdapter::OWeakEventListenerAdapter( Reference< XWeak > const & _rxListener, Reference< XComponent > const & _rxBroadcaster )
36 :OWeakEventListenerAdapter_Base( _rxListener, _rxBroadcaster )
37 {
38 // add ourself as listener to the broadcaster
39 OSL_ENSURE( _rxBroadcaster.is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid broadcaster!" );
40 if ( _rxBroadcaster.is() )
41 {
42 osl_atomic_increment( &m_refCount );
43 {
44 _rxBroadcaster->addEventListener( this );
45 }
46 osl_atomic_decrement( &m_refCount );
47 OSL_ENSURE( m_refCount > 0, "OWeakEventListenerAdapter::OWeakEventListenerAdapter: oops - not to be used with implementations which hold their listeners weak!" );
48 // the one and only reason for this adapter class (A) is to add as listener to a component (C) which
49 // holds its listeners hard, and forward all calls then to another listener (L) which is
50 // held weak by A.
51 // Now if C holds listeners weak, then we do not need A, we can add L directly to C.
52 }
53
54 OSL_ENSURE( getListener().is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid listener (does not support the XEventListener interface)!" );
55 }
56
57
58 void SAL_CALL OWeakEventListenerAdapter::disposing( )
59 {
60 Reference< XComponent > xBroadcaster( getBroadcaster( ), UNO_QUERY );
61 OSL_ENSURE( xBroadcaster.is(), "OWeakEventListenerAdapter::disposing: broadcaster is invalid in the meantime! How this?" );
62 if ( xBroadcaster.is() )
63 {
64 xBroadcaster->removeEventListener( this );
65 }
66
67 resetListener();
68 }
69
70
71} // namespace comphelper
72
73
74/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
css::uno::Reference< css::uno::XInterface > getListener() const
yet another base for weak listener adapters, this time with some type safety