1 files changed, 155 insertions, 0 deletions
diff --git a/unotools/source/misc/eventlisteneradapter.cxx b/unotools/source/misc/eventlisteneradapter.cxx
new file mode 100644
index 000000000..b899db5c0
--- /dev/null
+++ b/unotools/source/misc/eventlisteneradapter.cxx
@@ -0,0 +1,155 @@
+/* -*- 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 <sal/config.h>
+
+#include <vector>
+
+#include <com/sun/star/lang/XComponent.hpp>
+#include <unotools/eventlisteneradapter.hxx>
+#include <osl/diagnose.h>
+#include <cppuhelper/implbase.hxx>
+#include <rtl/ref.hxx>
+
+namespace utl
+{
+
+    using namespace ::com::sun::star::uno;
+    using namespace ::com::sun::star::lang;
+
+    //= OEventListenerImpl
+
+    class OEventListenerImpl : public ::cppu::WeakImplHelper< XEventListener >
+    {
+    protected:
+        OEventListenerAdapter*          m_pAdapter;
+        Reference< XEventListener >     m_xKeepMeAlive;
+            // imagine an implementation of XComponent which holds it's listeners with a weak reference ...
+            // would be very bad if we don't hold ourself
+        Reference< XComponent >         m_xComponent;
+
+    public:
+        OEventListenerImpl( OEventListenerAdapter* _pAdapter, const Reference< XComponent >& _rxComp );
+
+        void                            dispose();
+        const Reference< XComponent >&  getComponent() const { return m_xComponent; }
+
+    protected:
+        virtual void SAL_CALL disposing( const EventObject& _rSource ) override;
+    };
+
+    OEventListenerImpl::OEventListenerImpl( OEventListenerAdapter* _pAdapter, const Reference< XComponent >& _rxComp )
+        :m_pAdapter(_pAdapter)
+    {
+        OSL_ENSURE(m_pAdapter, "OEventListenerImpl::OEventListenerImpl: invalid adapter!");
+        // no checks of _rxComp !!
+        // (OEventListenerAdapter is responsible for this)
+
+        // just in case addEventListener throws an exception ... don't initialize m_xKeepMeAlive before this
+        // is done
+        Reference< XEventListener > xMeMyselfAndI = this;
+        _rxComp->addEventListener(xMeMyselfAndI);
+
+        m_xComponent = _rxComp;
+        m_xKeepMeAlive = xMeMyselfAndI;
+    }
+
+    void OEventListenerImpl::dispose()
+    {
+        if (m_xComponent.is())
+        {
+            if (m_xKeepMeAlive.is())
+                m_xComponent->removeEventListener(m_xKeepMeAlive);
+            m_xComponent.clear();
+            m_xKeepMeAlive.clear();
+        }
+    }
+
+    void SAL_CALL OEventListenerImpl::disposing( const EventObject& _rSource )
+    {
+        Reference< XEventListener > xDeleteUponLeaving = m_xKeepMeAlive;
+        m_xKeepMeAlive.clear();
+
+        m_pAdapter->_disposing(_rSource);
+    }
+
+    //= OEventListenerAdapterImpl
+
+    struct OEventListenerAdapterImpl
+    {
+    public:
+        std::vector< rtl::Reference<OEventListenerImpl> >  aListeners;
+    };
+
+    //= OEventListenerAdapter
+
+    OEventListenerAdapter::OEventListenerAdapter()
+        :m_pImpl(new OEventListenerAdapterImpl)
+    {
+    }
+
+    OEventListenerAdapter::~OEventListenerAdapter()
+    {
+        stopAllComponentListening( );
+    }
+
+    void OEventListenerAdapter::stopComponentListening( const css::uno::Reference< css::lang::XComponent >& _rxComp )
+    {
+        if ( m_pImpl->aListeners.empty() )
+            return;
+
+        auto it = m_pImpl->aListeners.begin();
+        do
+        {
+            rtl::Reference<OEventListenerImpl>& pListenerImpl = *it;
+            if ((pListenerImpl->getComponent().get() == _rxComp.get()) || (pListenerImpl->getComponent() == _rxComp))
+            {
+                pListenerImpl->dispose();
+                it = m_pImpl->aListeners.erase( it );
+            }
+            else
+                ++it;
+        }
+        while ( it != m_pImpl->aListeners.end() );
+    }
+
+    void OEventListenerAdapter::stopAllComponentListening(  )
+    {
+        for ( const auto & i : m_pImpl->aListeners )
+        {
+            i->dispose();
+        }
+        m_pImpl->aListeners.clear();
+    }
+
+    void OEventListenerAdapter::startComponentListening( const Reference< XComponent >& _rxComp )
+    {
+        if (!_rxComp.is())
+        {
+            OSL_FAIL("OEventListenerAdapter::startComponentListening: invalid component!");
+            return;
+        }
+
+        rtl::Reference<OEventListenerImpl> pListenerImpl = new OEventListenerImpl(this, _rxComp);
+        m_pImpl->aListeners.emplace_back(pListenerImpl);
+    }
+
+}   // namespace utl
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */