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diff --git a/sd/source/ui/slidesorter/inc/controller/SlsSelectionManager.hxx b/sd/source/ui/slidesorter/inc/controller/SlsSelectionManager.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 <sal/types.h>
+#include <tools/link.hxx>
+#include <vector>
+#include <memory>
+
+class SdPage;
+
+namespace sd::slidesorter
+{
+class SlideSorter;
+}
+
+namespace sd::slidesorter::controller
+{
+class SlideSorterController;
+class SelectionObserver;
+
+/** This class is a part of the controller and handles the selection of
+    slides.
+    <p>It has methods to modify the selected slides (delete them or
+    move them to other places in the document), change the visible area so
+    to make the selected slides visible, tell listeners when the selection
+    changes.</p>
+*/
+class SelectionManager
+{
+public:
+    /** Create a new SelectionManager for the given slide sorter.
+    */
+    SelectionManager(SlideSorter& rSlideSorter);
+
+    ~SelectionManager();
+
+    /** Delete the currently selected slides.  When this method returns the
+        selection is empty.
+        @param bSelectFollowingPage
+            When <TRUE/> then after deleting the selected pages make the
+            slide after the last selected page the new current page.
+            When <FALSE/> then make the first slide before the selected
+            pages the new current slide.
+    */
+    void DeleteSelectedPages(const bool bSelectFollowingPage = true);
+
+    /** Call this method after the selection has changed (possible several
+        calls to the PageSelector) to invalidate the relevant slots and send
+        appropriate events.
+    */
+    void SelectionHasChanged();
+
+    /** Add a listener that is called when the selection of the slide sorter
+        changes.
+        @param rListener
+            When this method is called multiple times for the same listener
+            the second and all following calls are ignored.  Each listener
+            is added only once.
+    */
+    void AddSelectionChangeListener(const Link<LinkParamNone*, void>& rListener);
+
+    /** Remove a listener that was called when the selection of the slide
+        sorter changes.
+        @param rListener
+            It is safe to pass a listener that was not added are has been
+            removed previously.  Such calls are ignored.
+    */
+    void RemoveSelectionChangeListener(const Link<LinkParamNone*, void>& rListener);
+
+    /** Return the position where to insert pasted slides based on the
+        current selection.  When there is a selection then the insert
+        position is behind the last slide.  When the selection is empty then
+        most of the time the insert position is at the end of the document.
+        There is an exception right after the display of a popup-menu.  The
+        position of the associated insertion marker is stored here and reset
+        the next time the selection changes.
+    */
+    sal_Int32 GetInsertionPosition() const;
+
+    /** Store an insertion position temporarily.  It is reset when the
+        selection changes the next time.
+    */
+    void SetInsertionPosition(const sal_Int32 nInsertionPosition);
+
+    const std::shared_ptr<SelectionObserver>& GetSelectionObserver() const
+    {
+        return mpSelectionObserver;
+    }
+
+private:
+    SlideSorter& mrSlideSorter;
+    SlideSorterController& mrController;
+
+    ::std::vector<Link<LinkParamNone*, void>> maSelectionChangeListeners;
+
+    /** The insertion position is only temporarily valid.  Negative values
+        indicate that the explicit insertion position is not valid.  In this
+        case GetInsertionPosition() calculates it from the current selection.
+    */
+    sal_Int32 mnInsertionPosition;
+
+    std::shared_ptr<SelectionObserver> mpSelectionObserver;
+
+    /** Delete the given list of normal pages.  This method is a helper
+        function for DeleteSelectedPages().
+        @param rSelectedNormalPages
+            A list of normal pages.  Supplying master pages is an error.
+    */
+    void DeleteSelectedNormalPages(const ::std::vector<SdPage*>& rSelectedNormalPages);
+
+    /** Delete the given list of master pages.  This method is a helper
+        function for DeleteSelectedPages().
+        @param rSelectedMasterPages
+            A list of master pages.  Supplying normal pages is an error.
+    */
+    void DeleteSelectedMasterPages(const ::std::vector<SdPage*>& rSelectedMasterPages);
+};
+
+} // end of namespace ::sd::slidesorter::controller
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */