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diff --git a/sd/source/ui/sidebar/MasterPageContainer.hxx b/sd/source/ui/sidebar/MasterPageContainer.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 <vcl/image.hxx>
+
+#include <memory>
+
+class SdPage;
+
+namespace sd::sidebar
+{
+class MasterPageDescriptor;
+class MasterPageContainerChangeEvent;
+
+/** This container manages the master pages used by the MasterPagesSelector
+    controls.  It uses internally a singleton implementation object.
+    Therefore, all MasterPageContainer object operator on the same set of
+    master pages.  Each MasterPageContainer, however, has its own
+    PreviewSize value and thus can independently switch between large and
+    small previews.
+
+    The container maintains its own document to store master page objects.
+
+    For each master page container stores its URL, preview bitmap, page
+    name, and, if available, the page object.
+
+    Entries are accessed via a Token, which is mostly a numerical index but
+    whose values do not necessarily have to be consecutive.
+*/
+class MasterPageContainer final
+{
+public:
+    typedef int Token;
+    static const Token NIL_TOKEN = -1;
+
+    MasterPageContainer();
+    ~MasterPageContainer();
+
+    void AddChangeListener(const Link<MasterPageContainerChangeEvent&, void>& rLink);
+    void RemoveChangeListener(const Link<MasterPageContainerChangeEvent&, void>& rLink);
+
+    enum PreviewSize
+    {
+        SMALL,
+        LARGE
+    };
+    /** There are two different preview sizes, a small one and a large one.
+        Which one is used by the called container can be changed with this
+        method.
+        When the preview size is changed then all change listeners are
+        notified of this.
+    */
+    void SetPreviewSize(PreviewSize eSize);
+
+    /** Returns the preview size.
+    */
+    PreviewSize GetPreviewSize() const { return mePreviewSize; }
+
+    /** Return the preview size in pixels.
+    */
+    Size const& GetPreviewSizePixel() const;
+
+    enum PreviewState
+    {
+        PS_AVAILABLE,
+        PS_CREATABLE,
+        PS_PREPARING,
+        PS_NOT_AVAILABLE
+    };
+    PreviewState GetPreviewState(Token aToken);
+
+    /** This method is typically called for entries in the container for
+        which GetPreviewState() returns OS_CREATABLE.  The creation of the
+        preview is then scheduled to be executed asynchronously at a later
+        point in time.  When the preview is available the change listeners
+        will be notified.
+    */
+    bool RequestPreview(Token aToken);
+
+    /** Each entry of the container is either the first page of a template
+        document or is a master page of an Impress document.
+    */
+    enum Origin
+    {
+        MASTERPAGE, // Master page of a document.
+        TEMPLATE, // First page of a template file.
+        DEFAULT, // Empty master page with default style.
+        UNKNOWN
+    };
+
+    /** Put the master page identified and described by the given parameters
+        into the container.  When there already is a master page with the
+        given URL, page name, or object pointer (when that is not NULL) then
+        the existing entry is replaced/updated by the given one.  Otherwise
+        a new entry is inserted.
+    */
+    Token PutMasterPage(const std::shared_ptr<MasterPageDescriptor>& rDescriptor);
+    void AcquireToken(Token aToken);
+    void ReleaseToken(Token aToken);
+
+    /** This and the GetTokenForIndex() methods can be used to iterate over
+        all members of the container.
+    */
+    int GetTokenCount() const;
+
+    /** Determine whether the container has a member for the given token.
+    */
+    bool HasToken(Token aToken) const;
+
+    /** Return a token for an index in the range
+        0 <= index < GetTokenCount().
+    */
+    Token GetTokenForIndex(int nIndex);
+
+    Token GetTokenForURL(const OUString& sURL);
+    Token GetTokenForStyleName(const OUString& sStyleName);
+    Token GetTokenForPageObject(const SdPage* pPage);
+
+    OUString GetURLForToken(Token aToken);
+    OUString GetPageNameForToken(Token aToken);
+    OUString GetStyleNameForToken(Token aToken);
+    SdPage* GetPageObjectForToken(Token aToken, bool bLoad);
+    Origin GetOriginForToken(Token aToken);
+    sal_Int32 GetTemplateIndexForToken(Token aToken);
+    std::shared_ptr<MasterPageDescriptor> GetDescriptorForToken(Token aToken);
+
+    void InvalidatePreview(Token aToken);
+
+    /** Return a preview for the specified token.  When the preview is not
+        present then the PreviewProvider associated with the token is
+        executed only when that is not expensive.  It is the responsibility
+        of the caller to call RequestPreview() to do the same
+        (asynchronously) for expensive PreviewProviders.
+        Call GetPreviewState() to find out if that is necessary.
+        @param aToken
+            This token specifies for which master page to return the preview.
+            Tokens are returned for example by the GetTokenFor...() methods.
+        @return
+            The returned image is the requested preview or a substitution.
+    */
+    Image GetPreviewForToken(Token aToken);
+
+private:
+    class Implementation;
+    std::shared_ptr<Implementation> mpImpl;
+    PreviewSize mePreviewSize;
+};
+
+/** For some changes to the set of master pages in a MasterPageContainer or
+    to the data stored for each master page one or more events are sent to
+    registered listeners.
+    Each event has an event type and a token that tells the listener where
+    the change took place.
+*/
+class MasterPageContainerChangeEvent
+{
+public:
+    enum class EventType
+    {
+        // A master page was added to the container.
+        CHILD_ADDED,
+        // A master page was removed from the container.
+        CHILD_REMOVED,
+        // The preview of a master page has changed.
+        PREVIEW_CHANGED,
+        // The size of a preview has changed.
+        SIZE_CHANGED,
+        // Some of the data stored for a master page has changed.
+        DATA_CHANGED,
+        // The TemplateIndex of a master page has changed.
+        INDEX_CHANGED,
+    } meEventType;
+
+    // Token of the container entry whose data changed or which was added or
+    // removed.
+    MasterPageContainer::Token maChildToken;
+};
+
+} // end of namespace sd::sidebar
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */