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diff --git a/sd/source/ui/inc/ViewShellManager.hxx b/sd/source/ui/inc/ViewShellManager.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_VIEWSHELLMANAGER_HXX
+#define INCLUDED_SD_SOURCE_UI_INC_VIEWSHELLMANAGER_HXX
+
+#include "ShellFactory.hxx"
+#include <o3tl/deleter.hxx>
+#include <memory>
+
+class FmFormShell;
+class SfxShell;
+
+namespace sd {
+
+class ViewShell;
+class ViewShellBase;
+
+/** The ViewShellManager has the responsibility to manage the view shells
+    and sub shells on the SFX shell stack.  They form a two level hierarchy
+    (the underlying ViewShellBase, the only true SfxViewShell descendant,
+    forms a third level.)  On the first level there are the view shells
+    (what formerly was called view shell, anyway; nowadays they are derived
+    from SfxShell) and shells for panes. On the second level there are sub
+    shells (also derived from SfxShell) that usually are tool bars.
+
+    <p>On the SFX shell stack the regular sub shells are placed above their
+    view shells.  The FormShell is a special case.  With the SetFormShell()
+    method it can be placed directly above or below one of the view
+    shells.</p>
+
+    <p>Shells managed by this class are created by factories or are given
+    directly to Activate... methods.  For the sub shells there is one
+    factory for every view shell.  Factories are added or removed via the
+    (Add|Remove)SubShellFactory() methods.  The FormShell is managed with the
+    factory of its view shell.</p>
+*/
+class ViewShellManager
+{
+public:
+    typedef std::shared_ptr<ShellFactory<SfxShell> > SharedShellFactory;
+
+    ViewShellManager (ViewShellBase& rBase);
+
+    /** Before the destructor is called the method Shutdown() has to have
+        been called.
+    */
+    ~ViewShellManager();
+
+    /** Tell a ViewShellManager object to prepare to be deleted, i.e. to
+        destroy all of its resources and to ignore all following calls.
+        Use this when the owner of the view shell manager is about being
+        destroyed but the view shell manager itself can not yet be deleted.
+    */
+    void Shutdown();
+
+    /** Set the factory for sub shells of the specified view shell.
+    */
+    void AddSubShellFactory (
+        ViewShell const * pViewShell,
+        const SharedShellFactory& rpFactory);
+    void RemoveSubShellFactory (
+        ViewShell const * pViewShell,
+        const SharedShellFactory& rpFactory);
+
+    /** Activate the given view shell.
+    */
+    void ActivateViewShell (ViewShell* pViewShell);
+
+    /** Activate the given shell which is not a view shell.  For view shells
+        use the ActivateViewShell() method.
+    */
+    void ActivateShell (SfxShell* pShell);
+
+    /** Deactivate the specified shell, i.e. take it and all of its
+        object bars from the shell stack.
+        @param pShell
+            The shell to deactivate.
+    */
+    void DeactivateViewShell (const ViewShell* pShell);
+
+    /** Deactivate the specified shell.  The shell is not destroyed.
+    */
+    void DeactivateShell (const SfxShell* pShell);
+
+    /** Associate the form shell with a view shell and their relative
+        position.  This method does not change the shell stack, it just
+        stores the given values for the next shell stack update.
+        @param pParentShell
+            The view shell of the form shell.
+        @param pFormShell
+            The form shell.
+        @param bAbove
+            When <TRUE/> then the form shell will be placed directly above
+            pViewShell on the SFX shell stack.  Otherwise the form shell is
+            placed directly below the view shell.
+    */
+    void SetFormShell (const ViewShell* pParentShell, FmFormShell* pFormShell, bool bAbove);
+
+    /** Activate the specified shell as sub shell for the given view shell.
+        The sub shell factory associated with the view shell is used to
+        create the sub shell.
+        @param rParentShell
+            The new sub shell will be placed above this view shell.
+        @param nId
+            This id is used only with the factory registered for the parent
+            view shell.
+    */
+    void ActivateSubShell (const ViewShell& rParentShell, ShellId nId);
+
+    /** Deactivate the specified sub shell.
+    */
+    void DeactivateSubShell (const ViewShell& rParentShell, ShellId nId);
+
+    /** Send all sub shells of the specified view shell an Invalidate()
+        call.  This does not modify the shell stack.
+    */
+    void InvalidateAllSubShells (
+        ViewShell const * pViewShell);
+
+    /** Move the specified view shell to the top most position on the stack
+        of view shells in relation to the other view shells.  After this the
+        only shells that are higher on the stack are its object bars.
+
+        Call this method after a focus change to bring a view mode view
+        shell and is associated tool bar shells to the top of the
+        stack.
+
+        The mbKeepMainViewShellOnTop flag is not obeyed.
+
+        @param nId
+            The id of the shell to move to the top.
+    */
+    void MoveToTop (const ViewShell& rShell);
+
+    /** Return the first, i.e. top most, view shell that has been activated
+        under the given id.
+        @param nId
+            The id of the shell for which to return a pointer.
+        @return
+            When the specified shell is currently not active then NULL is
+            returned.
+    */
+    SfxShell* GetShell (ShellId nId) const;
+
+    /** Return the top-most shell on the SFX shell stack regardless of
+        whether that is a view shell or a sub shell.
+    */
+    SfxShell* GetTopShell() const;
+
+    /** Return the top-most active view shell on the internal shell stack.
+    */
+    SfxShell* GetTopViewShell() const;
+
+    /** Use this class to safely lock updates of the view shell stack.
+    */
+    class UpdateLock
+    {
+    public:
+        UpdateLock (const std::shared_ptr<ViewShellManager>& rpManager)
+            : mpManager(rpManager) {mpManager->LockUpdate();}
+        ~UpdateLock() COVERITY_NOEXCEPT_FALSE {mpManager->UnlockUpdate();}
+    private:
+        std::shared_ptr<ViewShellManager> mpManager;
+    };
+    friend class UpdateLock;
+
+private:
+    class Implementation;
+    std::unique_ptr<ViewShellManager::Implementation, o3tl::default_delete<ViewShellManager::Implementation>> mpImpl;
+    bool mbValid;
+
+    void LockUpdate();
+    void UnlockUpdate();
+};
+
+} // end of namespace sd
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */