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diff --git a/sd/source/ui/sidebar/MasterPagesSelector.hxx b/sd/source/ui/sidebar/MasterPagesSelector.hxx
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+++ b/sd/source/ui/sidebar/MasterPagesSelector.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 <map>
+#include <memory>
+#include "MasterPageContainer.hxx"
+#include "PreviewValueSet.hxx"
+#include <sfx2/sidebar/ILayoutableWindow.hxx>
+#include <sfx2/sidebar/PanelLayout.hxx>
+
+#include <osl/mutex.hxx>
+
+namespace com::sun::star::ui { class XSidebar; }
+class MouseEvent;
+class SdDrawDocument;
+class SdPage;
+
+namespace sd {
+class ViewShellBase;
+}
+
+namespace sd::sidebar {
+
+/** Base class of a menu that lets the user select from a list of
+    templates or designs that are loaded from files.
+*/
+class MasterPagesSelector : public PanelLayout
+                          , public sfx2::sidebar::ILayoutableWindow
+{
+public:
+    MasterPagesSelector (
+        weld::Widget* pParent,
+        SdDrawDocument& rDocument,
+        ViewShellBase& rBase,
+        std::shared_ptr<MasterPageContainer> pContainer,
+        css::uno::Reference<css::ui::XSidebar> xSidebar,
+        const OUString& rUIFileName,
+        const OUString& rValueSetName);
+    virtual ~MasterPagesSelector() override;
+
+    virtual void LateInit();
+
+    sal_Int32 GetPreferredHeight (sal_Int32 nWidth);
+
+    /** Make the selector empty.  This method clear the value set from any
+        entries. Override this method to add functionality, especially to
+        destroy objects set as data items at the value set.
+    */
+    void ClearPageSet();
+
+    void SetHelpId( const OUString& aId );
+
+    /** Mark the preview that belongs to the given index as not up-to-date
+        anymore with respect to page content or preview size.
+        The implementation of this method will either sunchronously or
+        asynchronously call UpdatePreview().
+        @param nIndex
+            Index into the value set control that is used for displaying the
+            previews.
+    */
+    void InvalidatePreview (const SdPage* pPage);
+
+    void UpdateAllPreviews();
+
+    void ShowContextMenu(const Point* pPos);
+
+    // ILayoutableWindow
+    virtual css::ui::LayoutSize GetHeightForWidth (const sal_Int32 nWidth) override;
+
+protected:
+    mutable ::osl::Mutex maMutex;
+    std::shared_ptr<MasterPageContainer> mpContainer;
+
+    std::unique_ptr<PreviewValueSet> mxPreviewValueSet;
+    std::unique_ptr<weld::CustomWeld> mxPreviewValueSetWin;
+
+    SdDrawDocument& mrDocument;
+    ViewShellBase& mrBase;
+
+    SdPage* GetSelectedMasterPage();
+
+    /** Assign the given master page to all slides of the document.
+        @param pMasterPage
+            The master page to assign to all slides.
+    */
+    void AssignMasterPageToAllSlides (SdPage* pMasterPage);
+
+    /** Assign the given master page to all slides that are selected in a
+        slide sorter that is displayed in the lef or center pane.  When both
+        panes display a slide sorter then the one in the center pane is
+        used.
+    */
+    void AssignMasterPageToSelectedSlides (SdPage* pMasterPage);
+
+    virtual void AssignMasterPageToPageList (
+        SdPage* pMasterPage,
+        const std::shared_ptr<std::vector<SdPage*>>& rPageList);
+
+    virtual void NotifyContainerChangeEvent (const MasterPageContainerChangeEvent& rEvent);
+
+    typedef ::std::pair<int, MasterPageContainer::Token> UserData;
+    UserData* GetUserData (int nIndex) const;
+    void SetUserData (int nIndex, std::unique_ptr<UserData> pData);
+
+    sal_Int32 GetIndexForToken (MasterPageContainer::Token aToken) const;
+    typedef ::std::vector<MasterPageContainer::Token> ItemList;
+    void UpdateItemList (::std::unique_ptr<ItemList> && pList);
+    void Clear();
+    /** Invalidate the specified item so that on the next Fill() this item
+        is updated.
+    */
+    void InvalidateItem (MasterPageContainer::Token aToken);
+
+    // For every item in the ValueSet we store its associated token.  This
+    // allows a faster access and easier change tracking.
+    ItemList maCurrentItemList;
+    typedef ::std::map<MasterPageContainer::Token,sal_Int32> TokenToValueSetIndex;
+    TokenToValueSetIndex maTokenToValueSetIndex;
+
+    ItemList maLockedMasterPages;
+    /** Lock master pages in the given list and release locks that were
+        previously acquired.
+    */
+    void UpdateLocks (const ItemList& rItemList);
+
+    void Fill();
+    virtual void Fill (ItemList& rItemList) = 0;
+
+    /** Give derived classes the opportunity to provide their own context
+        menu.  If they do then they probably have to provide their own
+        Execute() and GetState() methods as well.
+    */
+    virtual OUString GetContextMenuUIFile() const;
+
+    virtual void ProcessPopupMenu(weld::Menu& rMenu);
+    virtual void ExecuteCommand(const OUString& rIdent);
+
+private:
+    css::uno::Reference<css::ui::XSidebar> mxSidebar;
+
+    /** The offset between ValueSet index and MasterPageContainer::Token
+        last seen.  This value is used heuristically to speed up the lookup
+        of an index for a token.
+    */
+    DECL_LINK(ClickHandler, ValueSet*, void);
+    DECL_LINK(ContextMenuHandler, const Point*, void);
+    DECL_LINK(ContainerChangeListener, MasterPageContainerChangeEvent&, void);
+
+    void SetItem (
+        sal_uInt16 nIndex,
+        MasterPageContainer::Token aToken);
+    void AddTokenToIndexEntry (
+        sal_uInt16 nIndex,
+        MasterPageContainer::Token aToken);
+    void RemoveTokenToIndexEntry (
+        sal_uInt16 nIndex,
+        MasterPageContainer::Token aToken);
+};
+
+} // end of namespace sd::sidebar
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */