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diff --git a/sdext/source/presenter/PresenterHelper.hxx b/sdext/source/presenter/PresenterHelper.hxx
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+++ b/sdext/source/presenter/PresenterHelper.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_SDEXT_SOURCE_PRESENTER_PRESENTERHELPER_HXX
+#define INCLUDED_SDEXT_SOURCE_PRESENTER_PRESENTERHELPER_HXX
+
+#include <com/sun/star/frame/XController.hpp>
+#include <com/sun/star/presentation/XSlideShowController.hpp>
+
+namespace sdext::presenter {
+
+/** Collection of helper functions that do not fit in anywhere else.
+    Provide access to frequently used strings of the drawing framework.
+*/
+namespace PresenterHelper
+{
+    extern const OUString msPaneURLPrefix;
+    extern const OUString msCenterPaneURL;
+    extern const OUString msFullScreenPaneURL;
+
+    extern const OUString msViewURLPrefix;
+    extern const OUString msPresenterScreenURL;
+    extern const OUString msSlideSorterURL;
+
+    extern const OUString msResourceActivationEvent;
+    extern const OUString msResourceDeactivationEvent;
+
+    extern const OUString msDefaultPaneStyle;
+    extern const OUString msDefaultViewStyle;
+
+    /** Return the slide show controller of a running presentation that has
+        the same document as the given framework controller.
+        @return
+            When no presentation is running this method returns an empty reference.
+    */
+    css::uno::Reference<css::presentation::XSlideShowController> GetSlideShowController (
+        const css::uno::Reference<css::frame::XController>& rxController);
+}
+
+} // end of namespace presenter
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */