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diff --git a/sd/source/ui/inc/WindowUpdater.hxx b/sd/source/ui/inc/WindowUpdater.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_SD_SOURCE_UI_INC_WINDOWUPDATER_HXX
+#define INCLUDED_SD_SOURCE_UI_INC_WINDOWUPDATER_HXX
+
+#include <svl/ctloptions.hxx>
+#include <vcl/vclptr.hxx>
+#include <sddllapi.h>
+
+#include <vector>
+
+namespace vcl { class Window; }
+class OutputDevice;
+class SdDrawDocument;
+
+namespace sd {
+
+/** The purpose of the <type>WindowUpdater</type> is to update output
+    devices to take care of modified global values.  These values are
+    monitored for changes.  At the moment this is
+    the digit language that defines the glyphs to use to render digits.
+    Other values may be added in the future.
+
+    <p>The methods of this class have not been included into the
+    <type>ViewShell</type> class in order to not clutter its interface any
+    further.  This class accesses some of <type>ViewShell</type> data
+    members directly and thus is declared as its friend.</p>
+
+    <p>Windows that are to be kept up-to-date have to be registered via the
+    <member>RegisterWindow()</member> method.  When a document is given then
+    this document is reformatted when the monitored option changes.</p>
+*/
+class WindowUpdater : public utl::ConfigurationListener
+{
+public:
+    explicit WindowUpdater();
+    virtual ~WindowUpdater() throw() override;
+
+    /** Add the given device to the list of devices which will be updated
+        when one of the monitored values changes.
+        @param pWindow
+            This device is added to the device list if it is not <null/> and
+            when it is not already a member of that list.
+    */
+    void RegisterWindow (vcl::Window* pWindow);
+
+    /** Remove the given device from the list of devices which will be updated
+        when one of the monitored values changes.
+        @param pWindow
+            This device is removed from the device list when it is a member
+            of that list.
+    */
+    void UnregisterWindow (vcl::Window* pWindow);
+
+    /** Set the document so that it is reformatted when one of the monitored
+        values changes.
+        @param pDocument
+            When <null/> is given document reformatting will not take
+            place in the future.
+    */
+    void SetDocument (SdDrawDocument* pDocument);
+
+    /** Update the given output device and update all text objects of the
+        view shell if not told otherwise.
+        @param pWindow
+            The device to update.  When the given pointer is NULL then
+            nothing is done.
+    */
+    void Update (OutputDevice* pDevice) const;
+
+    /** Callback that waits for notifications of a
+        <type>SvtCTLOptions</type> object.
+    */
+    virtual void ConfigurationChanged ( utl::ConfigurationBroadcaster*, ConfigurationHints nHint) override;
+
+private:
+    /// Options to monitor for changes.
+    SvtCTLOptions maCTLOptions;
+
+    /// The document rendered in the output devices.
+    SdDrawDocument* mpDocument;
+
+    WindowUpdater (const WindowUpdater& rUpdater) = delete;
+
+    WindowUpdater operator= (const WindowUpdater& rUpdater) = delete;
+
+    /** Type and data member for a list of devices that have to be kept
+        up-to-date.
+    */
+    typedef ::std::vector< VclPtr<vcl::Window> > tWindowList;
+    tWindowList maWindowList;
+
+    /** The central method of this class.  Update the given output device.
+        It is the task of the caller to initiate a reformatting of the
+        document that is rendered on this device to reflect the changes.
+        @param pWindow
+            The output device to update.  When it is <null/> then the call
+            is ignored.
+    */
+    void UpdateWindow (OutputDevice* pDevice) const;
+};
+
+} // end of namespace sd
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */