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diff --git a/sd/source/ui/sidebar/MasterPageContainerFiller.hxx b/sd/source/ui/sidebar/MasterPageContainerFiller.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_SIDEBAR_MASTERPAGECONTAINERFILLER_HXX
+#define INCLUDED_SD_SOURCE_UI_SIDEBAR_MASTERPAGECONTAINERFILLER_HXX
+
+#include <memory>
+#include "MasterPageContainer.hxx"
+#include "MasterPageDescriptor.hxx"
+#include <tools/AsynchronousTask.hxx>
+
+namespace sd {
+class TemplateScanner;
+class TemplateEntry;
+}
+
+namespace sd::sidebar {
+
+/** Fill a MasterPageContainer with information about the available master
+    pages.  These are provided by one default page and from the existing
+    Impress templates.  This is done asynchronously.
+*/
+class MasterPageContainerFiller
+    : public ::sd::tools::AsynchronousTask
+{
+public:
+    class ContainerAdapter
+    {
+    public:
+        virtual MasterPageContainer::Token PutMasterPage (
+            const SharedMasterPageDescriptor& rpDescriptor) = 0;
+        /** This method is called when all Impress templates have been added
+            to the container via the PutMasterPage() method.
+        */
+        virtual void FillingDone() = 0;
+
+    protected:
+        ~ContainerAdapter() {}
+    };
+
+    explicit MasterPageContainerFiller (ContainerAdapter& rContainerAdapter);
+    virtual ~MasterPageContainerFiller();
+
+    /** Run the next step of the task.  After HasNextStep() returns false
+        this method should ignore further calls.
+    */
+    virtual void RunNextStep() override;
+
+    /** Return <TRUE/> when there is at least one more step to execute.
+        When the task has been executed completely then <FALSE/> is
+        returned.
+    */
+    virtual bool HasNextStep() override;
+
+private:
+    ContainerAdapter& mrContainerAdapter;
+    // Remember what the next step has to do.
+    enum State {
+        INITIALIZE_TEMPLATE_SCANNER,
+        SCAN_TEMPLATE,
+        ADD_TEMPLATE,
+        ERROR,
+        DONE
+    } meState;
+    ::std::unique_ptr<TemplateScanner> mpScannerTask;
+    const TemplateEntry* mpLastAddedEntry;
+    int mnIndex;
+
+    State ScanTemplate();
+    State AddTemplate();
+};
+
+} // end of namespace sd::sidebar
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */