1 files changed, 153 insertions, 0 deletions
diff --git a/comphelper/source/property/propmultiplex.cxx b/comphelper/source/property/propmultiplex.cxx
new file mode 100644
index 000000000..66a1545f8
--- /dev/null
+++ b/comphelper/source/property/propmultiplex.cxx
@@ -0,0 +1,153 @@
+/* -*- 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 <com/sun/star/beans/XPropertySet.hpp>
+#include <comphelper/propmultiplex.hxx>
+#include <osl/diagnose.h>
+
+
+namespace comphelper
+{
+
+
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::beans;
+
+OPropertyChangeListener::~OPropertyChangeListener()
+{
+    if (m_xAdapter.is())
+        m_xAdapter->dispose();
+}
+
+
+void OPropertyChangeListener::_disposing(const EventObject&)
+{
+    // nothing to do here
+}
+
+
+void OPropertyChangeListener::disposeAdapter()
+{
+    if ( m_xAdapter.is() )
+        m_xAdapter->dispose();
+
+    // will automatically set a new adapter
+    OSL_ENSURE( !m_xAdapter.is(), "OPropertyChangeListener::disposeAdapter: what did dispose do?" );
+}
+
+
+void OPropertyChangeListener::setAdapter(OPropertyChangeMultiplexer* pAdapter)
+{
+    ::osl::MutexGuard aGuard(m_rMutex);
+    m_xAdapter = pAdapter;
+}
+
+OPropertyChangeMultiplexer::OPropertyChangeMultiplexer(OPropertyChangeListener* _pListener, const  Reference< XPropertySet>& _rxSet, bool _bAutoReleaseSet)
+            :m_xSet(_rxSet)
+            ,m_pListener(_pListener)
+            ,m_nLockCount(0)
+            ,m_bListening(false)
+            ,m_bAutoSetRelease(_bAutoReleaseSet)
+{
+    m_pListener->setAdapter(this);
+}
+
+
+OPropertyChangeMultiplexer::~OPropertyChangeMultiplexer()
+{
+}
+
+
+void OPropertyChangeMultiplexer::lock()
+{
+    ++m_nLockCount;
+}
+
+
+void OPropertyChangeMultiplexer::unlock()
+{
+    --m_nLockCount;
+}
+
+
+void OPropertyChangeMultiplexer::dispose()
+{
+    if (!m_bListening)
+        return;
+
+    Reference< XPropertyChangeListener> xPreventDelete(this);
+
+    for (const OUString& rProp : m_aProperties)
+        m_xSet->removePropertyChangeListener(rProp, static_cast< XPropertyChangeListener*>(this));
+
+    m_pListener->setAdapter(nullptr);
+
+    m_pListener = nullptr;
+    m_bListening = false;
+
+    if (m_bAutoSetRelease)
+        m_xSet = nullptr;
+}
+
+// XEventListener
+
+void SAL_CALL OPropertyChangeMultiplexer::disposing( const  EventObject& _rSource)
+{
+    if (m_pListener)
+    {
+         // tell the listener
+        if (!locked())
+            m_pListener->_disposing(_rSource);
+        // disconnect the listener
+        if (m_pListener)    // may have been reset whilst calling into _disposing
+            m_pListener->setAdapter(nullptr);
+    }
+
+    m_pListener = nullptr;
+    m_bListening = false;
+
+    if (m_bAutoSetRelease)
+        m_xSet = nullptr;
+}
+
+// XPropertyChangeListener
+
+void SAL_CALL OPropertyChangeMultiplexer::propertyChange( const  PropertyChangeEvent& _rEvent )
+{
+    if (m_pListener && !locked())
+        m_pListener->_propertyChanged(_rEvent);
+}
+
+
+void OPropertyChangeMultiplexer::addProperty(const OUString& _sPropertyName)
+{
+    if (m_xSet.is())
+    {
+        m_xSet->addPropertyChangeListener(_sPropertyName, static_cast< XPropertyChangeListener*>(this));
+        m_aProperties.push_back(_sPropertyName);
+        m_bListening = true;
+    }
+}
+
+
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */