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diff --git a/dbaccess/source/ui/app/subcomponentmanager.hxx b/dbaccess/source/ui/app/subcomponentmanager.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_DBACCESS_SOURCE_UI_APP_SUBCOMPONENTMANAGER_HXX
+#define INCLUDED_DBACCESS_SOURCE_UI_APP_SUBCOMPONENTMANAGER_HXX
+
+#include <AppElementType.hxx>
+
+#include <com/sun/star/beans/XPropertyChangeListener.hpp>
+#include <com/sun/star/lang/XComponent.hpp>
+
+#include <comphelper/sharedmutex.hxx>
+#include <cppuhelper/implbase.hxx>
+
+#include <memory>
+
+namespace dbaui
+{
+
+    struct SubComponentManager_Data;
+    class OApplicationController;
+
+    // SubComponentManager
+    typedef ::cppu::WeakImplHelper<   css::beans::XPropertyChangeListener
+                                  >   SubComponentManager_Base;
+    class SubComponentManager : public SubComponentManager_Base
+    {
+    public:
+        SubComponentManager( OApplicationController& _rController, const ::comphelper::SharedMutex& _rMutex );
+        virtual ~SubComponentManager() override;
+
+        void    disposing();
+
+        // XPropertyChangeListener
+        virtual void SAL_CALL propertyChange( const css::beans::PropertyChangeEvent& evt ) override;
+
+        // XEventListener
+        virtual void SAL_CALL disposing( const css::lang::EventObject& Source ) override;
+
+        // XDatabaseDocumentUI helpers
+        css::uno::Sequence< css::uno::Reference< css::lang::XComponent> >
+                    getSubComponents() const;
+        bool        closeSubComponents();
+
+        // container access
+        void        onSubComponentOpened(
+                        const OUString&  _rName,
+                        const sal_Int32         _nComponentType,
+                        const ElementOpenMode   _eOpenMode,
+                        const css::uno::Reference< css::lang::XComponent >&
+                                                _rxComponent
+                    );
+        bool        empty() const;
+
+        /** activates (i.e. brings to top) the frame in which the given component is loaded, if any
+
+            @return
+                <TRUE/> if any only of such a frame was found, i.e. the component had already been loaded
+                previously
+        */
+        bool        activateSubFrame(
+                        const OUString& _rName,
+                        const sal_Int32 _nComponentType,
+                        const ElementOpenMode _eOpenMode,
+                              css::uno::Reference< css::lang::XComponent >& o_rComponent
+                    ) const;
+
+        /** closes all frames of the given component
+
+            If a view for the component (given by name and type) has been loaded into one or more
+            frames (with potentially different OpenModes), then those frames are gracefully closed.
+
+            @return
+                <TRUE/> if and only if closing those frames was successful, or frames for the given sub component
+                exist.
+        */
+        bool        closeSubFrames(
+                        const OUString& _rName,
+                        const sal_Int32 _nComponentType
+                    );
+
+        /** searches for the given sub component
+
+            @param i_rComponent
+                the sub component to look up
+            @param o_rName
+                contains, upon successful return, the name of the sub component
+            @param o_nComponentType
+                contains, upon successful return, the type of the sub component
+            @return
+                <TRUE/> if and only if the component was found
+        */
+        bool        lookupSubComponent(
+                        const css::uno::Reference< css::lang::XComponent >& i_rComponent,
+                              OUString&  o_rName,
+                              sal_Int32&        o_rComponentType
+                    );
+
+    private:
+        std::unique_ptr< SubComponentManager_Data > m_pData;
+    };
+
+} // namespace dbaui
+
+#endif // INCLUDED_DBACCESS_SOURCE_UI_APP_SUBCOMPONENTMANAGER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */