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diff --git a/slideshow/source/inc/vieweventhandler.hxx b/slideshow/source/inc/vieweventhandler.hxx
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+++ b/slideshow/source/inc/vieweventhandler.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_VIEWEVENTHANDLER_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_VIEWEVENTHANDLER_HXX
+
+#include <memory>
+
+#include "unoview.hxx"
+#include "disposable.hxx"
+
+
+/* Definition of ViewEventHandler interface */
+
+namespace slideshow
+{
+    namespace internal
+    {
+
+        /** Interface for handling view events.
+
+            Classes implementing this interface can be added to an
+            EventMultiplexer object, and are called from there to
+            handle view events.
+         */
+        class ViewEventHandler : public virtual SharedPtrAble
+        {
+        public:
+            /** Notify new view.
+
+                @param rView
+                The newly added view
+             */
+            virtual void viewAdded( const UnoViewSharedPtr& rView ) = 0;
+
+            /** Notify removed view.
+
+                @param rView
+                The removed view
+             */
+            virtual void viewRemoved( const UnoViewSharedPtr& rView ) = 0;
+
+            /** Notify changed view.
+
+                Reasons for a viewChanged notification can be
+                different view size, transformation, or other device
+                properties (color resolution or profile, etc.)
+
+                @param rView
+                The changed view
+             */
+            virtual void viewChanged( const UnoViewSharedPtr& rView ) = 0;
+
+            /** Notify that all views changed.
+
+                Reasons for a viewChanged notification can be
+                different view size, transformation, or other device
+                properties (color resolution or profile, etc.)
+
+                Note that this method avoids hidden inefficiencies
+                (O(n^2) behaviour when viewChanged() needs to perform
+                linear searches)
+             */
+            virtual void viewsChanged() = 0;
+        };
+
+        typedef ::std::weak_ptr< ViewEventHandler >   ViewEventHandlerWeakPtr;
+
+    }
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_VIEWEVENTHANDLER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */