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diff --git a/slideshow/source/inc/hyperlinkarea.hxx b/slideshow/source/inc/hyperlinkarea.hxx
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+++ b/slideshow/source/inc/hyperlinkarea.hxx
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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 .
+ */
+
+#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_HYPERLINKAREA_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_HYPERLINKAREA_HXX
+
+#include <rtl/ustring.hxx>
+
+#include <memory>
+#include <vector>
+#include <utility>
+
+namespace basegfx {
+    class B2DRange;
+}
+
+/* Definition of HyperlinkArea interface */
+
+namespace slideshow::internal
+    {
+        /** HyperlinkArea interface
+
+            Implementers of this interface provide information for
+            hyperlink sensitive areas.
+         */
+        class HyperlinkArea
+        {
+        public:
+            typedef std::pair< ::basegfx::B2DRange,
+                               OUString >    HyperlinkRegion;
+
+            typedef std::vector<HyperlinkRegion>    HyperlinkRegions;
+
+            /** Request hyperlink-sensitive areas.
+
+                @return a vector of hyperlink-sensitive areas, plus
+                the URI associated to them.
+             */
+            virtual HyperlinkRegions getHyperlinkRegions() const = 0;
+
+            /** Retrieve priority of link area
+
+                @return the priority of the link area. Link areas with
+                higher priority will receive hyperlink clicks in favor
+                of areas with less priority, if they cover the same
+                place on screen.
+             */
+            virtual double getHyperlinkPriority() const = 0;
+
+            /** Functor struct, for area ordering
+
+                This defines a strict weak ordering of areas, sort key
+                is the object ptr value. Most typical use is for
+                associative containers holding areas.
+             */
+            struct lessThanArea
+            {
+                // make functor adaptable (to boost::bind)
+                typedef bool result_type;
+
+                bool operator()(const std::shared_ptr< HyperlinkArea >& rLHS,
+                                const std::shared_ptr< HyperlinkArea >& rRHS) const
+                {
+                    const double nPrioL( rLHS->getHyperlinkPriority() );
+                    const double nPrioR( rRHS->getHyperlinkPriority() );
+
+                    // if prios are equal, tie-break on ptr value
+                    return nPrioL == nPrioR ? rLHS.get() < rRHS.get() : nPrioL < nPrioR;
+                }
+            };
+
+        protected:
+            ~HyperlinkArea() {}
+       };
+
+        typedef std::shared_ptr< HyperlinkArea > HyperlinkAreaSharedPtr;
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_HYPERLINKAREA_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */