1 files changed, 74 insertions, 0 deletions
diff --git a/comphelper/source/misc/weakeventlistener.cxx b/comphelper/source/misc/weakeventlistener.cxx
new file mode 100644
index 000000000..e8ce46590
--- /dev/null
+++ b/comphelper/source/misc/weakeventlistener.cxx
@@ -0,0 +1,74 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <comphelper/weakeventlistener.hxx>
+#include <osl/diagnose.h>
+
+
+namespace comphelper
+{
+
+
+    using namespace ::com::sun::star::uno;
+    using namespace ::com::sun::star::lang;
+
+    OWeakListenerAdapterBase::~OWeakListenerAdapterBase()
+    {
+    }
+
+    OWeakEventListenerAdapter::OWeakEventListenerAdapter( Reference< XWeak > const & _rxListener, Reference< XComponent > const & _rxBroadcaster )
+        :OWeakEventListenerAdapter_Base( _rxListener, _rxBroadcaster )
+    {
+        // add ourself as listener to the broadcaster
+        OSL_ENSURE( _rxBroadcaster.is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid broadcaster!" );
+        if ( _rxBroadcaster.is() )
+        {
+            osl_atomic_increment( &m_refCount );
+            {
+                _rxBroadcaster->addEventListener( this );
+            }
+            osl_atomic_decrement( &m_refCount );
+            OSL_ENSURE( m_refCount > 0, "OWeakEventListenerAdapter::OWeakEventListenerAdapter: oops - not to be used with implementations which hold their listeners weak!" );
+                // the one and only reason for this adapter class (A) is to add as listener to a component (C) which
+                // holds its listeners hard, and forward all calls then to another listener (L) which is
+                // held weak by A.
+                // Now if C holds listeners weak, then we do not need A, we can add L directly to C.
+        }
+
+        OSL_ENSURE( getListener().is(), "OWeakEventListenerAdapter::OWeakEventListenerAdapter: invalid listener (does not support the XEventListener interface)!" );
+    }
+
+
+    void SAL_CALL OWeakEventListenerAdapter::disposing( )
+    {
+        Reference< XComponent > xBroadcaster( getBroadcaster( ), UNO_QUERY );
+        OSL_ENSURE( xBroadcaster.is(), "OWeakEventListenerAdapter::disposing: broadcaster is invalid in the meantime! How this?" );
+        if ( xBroadcaster.is() )
+        {
+            xBroadcaster->removeEventListener( this );
+        }
+
+        resetListener();
+    }
+
+
+}   // namespace comphelper
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */