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diff --git a/sd/source/ui/slidesorter/inc/controller/SlsClipboard.hxx b/sd/source/ui/slidesorter/inc/controller/SlsClipboard.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 <memory>
+#include <ViewClipboard.hxx>
+#include <controller/SlsSelectionObserver.hxx>
+#include <sdxfer.hxx>
+
+#include <sal/types.h>
+#include <o3tl/deleter.hxx>
+#include <svx/svdtypes.hxx>
+
+#include <sddllapi.h>
+
+class SfxRequest;
+struct AcceptDropEvent;
+class DropTargetHelper;
+struct ExecuteDropEvent;
+struct ImplSVEvent;
+class Point;
+class SdPage;
+namespace vcl { class Window; }
+
+namespace sd {
+class Window;
+}
+
+namespace sd::slidesorter { class SlideSorter; }
+
+namespace sd::slidesorter::controller {
+
+class SlideSorterController;
+
+class SAL_DLLPUBLIC_RTTI Clipboard final
+    : public ViewClipboard
+{
+public:
+    Clipboard (SlideSorter& rSlideSorter);
+    virtual ~Clipboard() override;
+
+    /** Create a slide sorter transferable from the given sd
+        transferable.  The returned transferable is set up with all
+        information necessary so that it can be dropped on a slide sorter.
+    */
+    static std::shared_ptr<SdTransferable::UserData> CreateTransferableUserData (SdTransferable* pTransferable);
+
+    void HandleSlotCall (SfxRequest& rRequest);
+
+    void DoCut ();
+    // Exported for unit test
+    SD_DLLPUBLIC void DoCopy();
+    // Exported for unit test
+    SD_DLLPUBLIC void DoPaste();
+    void DoDelete ();
+
+    void StartDrag (
+        const Point& rDragPt,
+        vcl::Window* pWindow );
+
+    void DragFinished (
+        sal_Int8 nDropAction);
+
+    sal_Int8 AcceptDrop (
+        const AcceptDropEvent& rEvt,
+        DropTargetHelper& rTargetHelper,
+        ::sd::Window* pTargetWindow,
+        sal_uInt16 nPage,
+        SdrLayerID nLayer );
+
+    sal_Int8 ExecuteDrop (
+        const ExecuteDropEvent& rEvt,
+        DropTargetHelper& rTargetHelper,
+        ::sd::Window* pTargetWindow,
+        sal_uInt16 nPage,
+        SdrLayerID nLayer );
+
+    void Abort();
+
+private:
+    virtual sal_uInt16 DetermineInsertPosition () override;
+
+    SlideSorter& mrSlideSorter;
+    SlideSorterController& mrController;
+
+    typedef ::std::vector<SdPage*> PageList;
+    /** Remember the pages that are dragged to another document or to
+        another place in the same document so that they can be removed after
+        a move operation.
+    */
+    PageList maPagesToRemove;
+
+    /** Used when a drop is executed to combine all undo actions into one.
+        Typically created in ExecuteDrop() and released in DragFinish().
+    */
+    class UndoContext;
+    std::unique_ptr<UndoContext> mxUndoContext;
+
+    std::unique_ptr<SelectionObserver::Context, o3tl::default_delete<SelectionObserver::Context>> mxSelectionObserverContext;
+    ImplSVEvent * mnDragFinishedUserEventId;
+
+    void CreateSlideTransferable (
+        vcl::Window* pWindow,
+        bool bDrag);
+
+    /** Determine the position of where to insert the pages in the current
+        transferable of the sd module.
+        @return
+            The index in the range [0,n] (both inclusive) with n the number
+            of pages is returned.
+    */
+    sal_Int32 GetInsertionPosition ();
+
+    /** Paste the pages of the transferable of the sd module at the given
+        position.
+        @param nInsertPosition
+            The position at which to insert the pages.  The valid range is
+            [0,n] (both inclusive) with n the number of pages in the
+            document.
+        @return
+            The number of inserted pages is returned.
+    */
+    sal_Int32 PasteTransferable (sal_Int32 nInsertPosition);
+
+    /** Select a range of pages of the model.  Typically usage is the
+        selection of newly inserted pages.
+        @param nFirstIndex
+            The index of the first page to select.
+        @param nPageCount
+            The number of pages to select.
+    */
+    void SelectPageRange (sal_Int32 nFirstIndex, sal_Int32 nPageCount);
+
+    /** Return <TRUE/> when the current transferable in the current state of
+        the slidesorter is acceptable to be pasted.  For this the
+        transferable has to
+        a) exist,
+        b) contain one or more regular draw pages, no master pages.
+        When master pages are involved, either in the transferable or in the
+        slide sorter (by it displaying master pages) the drop of the
+        transferable is not accepted.  The reason is the missing
+        implementation of proper handling master pages copy-and-paste.
+    */
+    enum DropType { DT_PAGE, DT_PAGE_FROM_NAVIGATOR, DT_SHAPE, DT_NONE };
+    DropType IsDropAccepted() const;
+
+    /** This method contains the code for AcceptDrop() and ExecuteDrop() shapes.
+        There are only minor differences for the two cases at this level.
+        @param eCommand
+            This parameter specifies whether to do an AcceptDrop() or
+            ExecuteDrop().
+        @param rPosition
+            Since the event is given as void pointer we can not take the
+            mouse position from it.  The caller has to supply it in this
+            parameter.
+        @param pDropEvent
+            Event though the AcceptDropEvent and ExecuteDropEvent are very
+            similar they do not have a common base class.  Because of that
+            we have to use a void* to pass these structs.
+        @param nPage
+            When the page number is given as 0xffff then it is replaced by
+            the number of the page at the mouse position.  If the mouse is
+            not over a page then neither AcceptDrop() nor ExecuteDrop() are
+            executed.
+    */
+    enum DropCommand { DC_ACCEPT, DC_EXECUTE };
+    sal_Int8 ExecuteOrAcceptShapeDrop (
+        DropCommand eCommand,
+        const Point& rPosition,
+        const void* pDropEvent ,
+        DropTargetHelper& rTargetHelper,
+        ::sd::Window* pTargetWindow,
+        sal_uInt16 nPage,
+        SdrLayerID nLayer);
+
+    /** Return whether the insertion defined by the transferable is
+        trivial, ie would not change either source nor target document.
+    */
+    bool IsInsertionTrivial (
+        SdTransferable const * pTransferable,
+        const sal_Int8 nDndAction) const;
+
+    /** Asynchronous part of DragFinished.  The argument is the sal_Int8
+        nDropAction, disguised as void*.
+    */
+    DECL_DLLPRIVATE_LINK(ProcessDragFinished, void*, void);
+};
+
+} // end of namespace ::sd::slidesorter::controller
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */