1 files changed, 114 insertions, 0 deletions
diff --git a/comphelper/source/misc/SelectionMultiplex.cxx b/comphelper/source/misc/SelectionMultiplex.cxx
new file mode 100644
index 0000000000..37e4e30037
--- /dev/null
+++ b/comphelper/source/misc/SelectionMultiplex.cxx
@@ -0,0 +1,114 @@
+/* -*- 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/SelectionMultiplex.hxx>
+#include <com/sun/star/view/XSelectionSupplier.hpp>
+
+namespace comphelper
+{
+
+
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::view;
+
+OSelectionChangeListener::~OSelectionChangeListener()
+{
+}
+
+
+void OSelectionChangeListener::_disposing(const EventObject&)
+{
+    // nothing to do here
+}
+
+
+OSelectionChangeMultiplexer::OSelectionChangeMultiplexer(OSelectionChangeListener* _pListener, const  Reference< XSelectionSupplier>& _rxSet)
+            :m_xSet(_rxSet)
+            ,m_pListener(_pListener)
+            ,m_nLockCount(0)
+{
+    osl_atomic_increment(&m_refCount);
+    {
+        Reference< XSelectionChangeListener> xPreventDelete(this);
+        m_xSet->addSelectionChangeListener(xPreventDelete);
+    }
+    osl_atomic_decrement(&m_refCount);
+}
+
+
+OSelectionChangeMultiplexer::~OSelectionChangeMultiplexer()
+{
+}
+
+
+void OSelectionChangeMultiplexer::lock()
+{
+    ++m_nLockCount;
+}
+
+
+void OSelectionChangeMultiplexer::unlock()
+{
+    --m_nLockCount;
+}
+
+
+// XEventListener
+
+void SAL_CALL OSelectionChangeMultiplexer::disposing( const  EventObject& _rSource)
+{
+    if (m_pListener)
+    {
+         // tell the listener
+        if (!locked())
+            m_pListener->_disposing(_rSource);
+    }
+
+    m_pListener = nullptr;
+
+    m_xSet = nullptr;
+}
+
+// XSelectionChangeListener
+
+void SAL_CALL OSelectionChangeMultiplexer::selectionChanged( const  EventObject& _rEvent )
+{
+    if (m_pListener && !locked())
+        m_pListener->_selectionChanged(_rEvent);
+}
+
+void OSelectionChangeMultiplexer::dispose()
+{
+    osl_atomic_increment(&m_refCount);
+    {
+        Reference< XSelectionChangeListener> xPreventDelete(this);
+        if(m_xSet.is())
+        {
+            m_xSet->removeSelectionChangeListener(xPreventDelete);
+            m_xSet.clear();
+        }
+    }
+    osl_atomic_decrement(&m_refCount);
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */