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diff --git a/include/sfx2/module.hxx b/include/sfx2/module.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_SFX2_MODULE_HXX
+#define INCLUDED_SFX2_MODULE_HXX
+
+#include <memory>
+#include <optional>
+#include <sal/config.h>
+#include <sfx2/dllapi.h>
+#include <sfx2/shell.hxx>
+#include <sfx2/styfitem.hxx>
+#include <sal/types.h>
+#include <tools/fldunit.hxx>
+#include <com/sun/star/uno/Reference.hxx>
+
+class SfxObjectFactory;
+class SfxModule_Impl;
+class SfxSlotPool;
+struct SfxChildWinFactory;
+struct SfxStbCtrlFactory;
+struct SfxTbxCtrlFactory;
+class SfxTabPage;
+
+namespace com::sun::star::frame {
+    class XFrame;
+}
+
+namespace weld {
+    class Container;
+    class DialogController;
+}
+
+class SFX2_DLLPUBLIC SfxModule : public SfxShell
+{
+private:
+    // Warning this cannot be turned into a unique_ptr.
+    // SfxInterface destruction in the SfxSlotPool refers again to pImpl after deletion of pImpl has commenced. See tdf#100270
+    SfxModule_Impl*             pImpl;
+
+    SAL_DLLPRIVATE void Construct_Impl(const OString& rResName);
+
+public:
+                                SFX_DECL_INTERFACE(SFX_INTERFACE_SFXMODULE)
+
+private:
+    /// SfxInterface initializer.
+    static void InitInterface_Impl() {}
+
+public:
+
+    SfxModule(const OString& rResName, std::initializer_list<SfxObjectFactory*> pFactoryList);
+    virtual ~SfxModule() override;
+
+    std::locale                 GetResLocale() const;
+    SfxSlotPool*                GetSlotPool() const;
+
+    void                        RegisterToolBoxControl(const SfxTbxCtrlFactory&);
+    void                        RegisterChildWindow(const SfxChildWinFactory&);
+    void                        RegisterStatusBarControl(const SfxStbCtrlFactory&);
+
+    virtual std::unique_ptr<SfxTabPage>  CreateTabPage( sal_uInt16 nId,
+                                               weld::Container* pPage, weld::DialogController* pController,
+                                               const SfxItemSet& rSet );
+    virtual void                Invalidate(sal_uInt16 nId = 0) override;
+
+    virtual std::optional<SfxStyleFamilies> CreateStyleFamilies() { return {}; }
+
+    static SfxModule*           GetActiveModule( SfxViewFrame* pFrame=nullptr );
+    static FieldUnit            GetCurrentFieldUnit();
+    /** retrieves the field unit of the module belonging to the document displayed in the given frame
+
+        Effectively, this method looks up the SfxViewFrame belonging to the given XFrame, then the SfxModule belonging to
+        the document in this frame, then this module's field unit.
+
+        Failures in any of those steps are reported as assertion in non-product builds, and then FieldUnit::MM_100TH is returned.
+     */
+    static FieldUnit            GetModuleFieldUnit( css::uno::Reference< css::frame::XFrame > const & i_frame );
+    FieldUnit                   GetFieldUnit() const;
+
+    SAL_DLLPRIVATE SfxTbxCtrlFactory* GetTbxCtrlFactory(const std::type_info& rSlotType, sal_uInt16 nSlotID) const;
+    SAL_DLLPRIVATE SfxStbCtrlFactory* GetStbCtrlFactory(const std::type_info& rSlotType, sal_uInt16 nSlotID) const;
+    SAL_DLLPRIVATE SfxChildWinFactory* GetChildWinFactoryById(sal_uInt16 nId) const;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */