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diff --git a/sd/source/ui/slidesorter/inc/controller/SlsCurrentSlideManager.hxx b/sd/source/ui/slidesorter/inc/controller/SlsCurrentSlideManager.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 .
+ */
+
+#pragma once
+
+#include <model/SlsSharedPageDescriptor.hxx>
+#include <vcl/timer.hxx>
+#include <tools/link.hxx>
+
+class SdPage;
+
+namespace sd::slidesorter
+{
+class SlideSorter;
+}
+
+namespace sd::slidesorter::controller
+{
+/** Manage the current slide.  This includes setting the according flags at
+    the PageDescriptor objects and setting the current slide at the main
+    view shell.
+
+    Switching pages is triggered only after a little delay.  This allows
+    fast travelling through a larger set of slides without having to wait
+    for the edit view to update its content after every slide change.
+*/
+class CurrentSlideManager
+{
+public:
+    /** Create a new CurrentSlideManager object that manages the current
+        slide for the given SlideSorter.
+    */
+    CurrentSlideManager(SlideSorter& rSlideSorter);
+
+    ~CurrentSlideManager();
+
+    /** Call this when the current page of the main view shell has been
+        switched.  Use SwitchCurrentSlide() to initiate such a switch.
+    */
+    void NotifyCurrentSlideChange(const sal_Int32 nSlideIndex);
+    void NotifyCurrentSlideChange(const SdPage* pPage);
+
+    /** Call this method to switch the current page of the main view shell
+        to the given slide.  Use CurrentSlideHasChanged() when the current
+        slide change has been initiated by someone else.
+        @param nSlideIndex
+            Zero based index in the range [0,number-of-slides).
+         The page selection is cleared and only the new
+            current slide is selected.
+    */
+    void SwitchCurrentSlide(const sal_Int32 nSlideIndex);
+    void SwitchCurrentSlide(const model::SharedPageDescriptor& rpSlide,
+                            const bool bUpdateSelection = false);
+
+    /** Return the page descriptor for the current slide.  Note, that when
+        there is no current slide then the returned pointer is empty.
+    */
+    const model::SharedPageDescriptor& GetCurrentSlide() const { return mpCurrentSlide; }
+
+    /** Release all references to model data.
+    */
+    void PrepareModelChange();
+
+    /** Modify inner state in reaction to a change of the SlideSorterModel.
+    */
+    void HandleModelChange();
+
+private:
+    SlideSorter& mrSlideSorter;
+    sal_Int32 mnCurrentSlideIndex;
+    model::SharedPageDescriptor mpCurrentSlide;
+    /** Timer to control the delay after which to ask
+        XController/ViewShellBase to switch to another slide.
+    */
+    Timer maSwitchPageDelayTimer;
+
+    void SetCurrentSlideAtViewShellBase(const model::SharedPageDescriptor& rpSlide);
+    void SetCurrentSlideAtTabControl(const model::SharedPageDescriptor& rpSlide);
+    void SetCurrentSlideAtXController(const model::SharedPageDescriptor& rpSlide);
+
+    /** When switching from one slide to a new current slide then this
+        method releases all ties to the old slide.
+    */
+    void ReleaseCurrentSlide();
+
+    /** When switching from one slide to a new current slide then this
+        method connects to the new current slide.
+    */
+    void AcquireCurrentSlide(const sal_Int32 nSlideIndex);
+
+    DECL_LINK(SwitchPageCallback, Timer*, void);
+};
+
+} // end of namespace ::sd::slidesorter::controller
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */