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diff --git a/sdext/source/presenter/PresenterHelper.cxx b/sdext/source/presenter/PresenterHelper.cxx
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+++ b/sdext/source/presenter/PresenterHelper.cxx
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+/* -*- 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 "PresenterHelper.hxx"
+
+#include <com/sun/star/presentation/XPresentationSupplier.hpp>
+#include <com/sun/star/presentation/XPresentation2.hpp>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::presentation;
+
+namespace sdext::presenter {
+
+constexpr OUStringLiteral msPaneURLPrefix( u"private:resource/pane/");
+const OUString PresenterHelper::msFullScreenPaneURL( msPaneURLPrefix + "FullScreenPane");
+
+Reference<presentation::XSlideShowController> PresenterHelper::GetSlideShowController (
+    const Reference<frame::XController>& rxController)
+{
+    Reference<presentation::XSlideShowController> xSlideShowController;
+
+    if( rxController.is() ) try
+    {
+        Reference<XPresentationSupplier> xPS ( rxController->getModel(), UNO_QUERY_THROW);
+
+        Reference<XPresentation2> xPresentation(xPS->getPresentation(), UNO_QUERY_THROW);
+
+        xSlideShowController = xPresentation->getController();
+    }
+    catch(RuntimeException&)
+    {
+    }
+
+    return xSlideShowController;
+}
+
+} // end of namespace ::sdext::presenter
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */