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diff --git a/extensions/source/propctrlr/propertycomposer.hxx b/extensions/source/propctrlr/propertycomposer.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_EXTENSIONS_SOURCE_PROPCTRLR_PROPERTYCOMPOSER_HXX
+#define INCLUDED_EXTENSIONS_SOURCE_PROPCTRLR_PROPERTYCOMPOSER_HXX
+
+#include "pcrcommon.hxx"
+#include "composeduiupdate.hxx"
+#include "formbrowsertools.hxx"
+
+#include <com/sun/star/inspection/XPropertyHandler.hpp>
+#include <com/sun/star/lang/DisposedException.hpp>
+#include <cppuhelper/compbase.hxx>
+#include <cppuhelper/basemutex.hxx>
+
+#include <memory>
+#include <vector>
+#include <set>
+
+
+namespace pcr
+{
+
+
+    //= PropertyComposer
+
+    typedef ::cppu::WeakComponentImplHelper    <   css::inspection::XPropertyHandler
+                                                ,   css::beans::XPropertyChangeListener
+                                                >   PropertyComposer_Base;
+    /** implements an <type>XPropertyHandler</type> which composes its information
+        from a set of other property handlers
+    */
+    class PropertyComposer  :public ::cppu::BaseMutex
+                            ,public PropertyComposer_Base
+                            ,public IPropertyExistenceCheck
+    {
+    public:
+        typedef std::vector< css::uno::Reference< css::inspection::XPropertyHandler > >
+                                                            HandlerArray;
+
+    private:
+        HandlerArray                                    m_aSlaveHandlers;
+        std::unique_ptr< ComposedPropertyUIUpdate >   m_pUIRequestComposer;
+        PropertyChangeListeners                         m_aPropertyListeners;
+        bool                                            m_bSupportedPropertiesAreKnown;
+        PropertyBag                                     m_aSupportedProperties;
+
+    public:
+        /** constructs an <type>XPropertyHandler</type> which composes its information from a set
+            of other property handlers
+
+            @param _rSlaveHandlers
+                the set of slave handlers to invoke. Must not be <NULL/>
+        */
+        explicit PropertyComposer( const std::vector< css::uno::Reference< css::inspection::XPropertyHandler > >& _rSlaveHandlers );
+
+    public:
+        // XPropertyHandler overridables
+        virtual void                                SAL_CALL inspect( const css::uno::Reference< css::uno::XInterface >& _rxIntrospectee ) override;
+        virtual css::uno::Any                       SAL_CALL getPropertyValue( const OUString& _rPropertyName ) override;
+        virtual void                                SAL_CALL setPropertyValue( const OUString& _rPropertyName, const css::uno::Any& _rValue ) override;
+        virtual css::uno::Any SAL_CALL convertToPropertyValue( const OUString& _rPropertyName, const css::uno::Any& _rControlValue ) override;
+        virtual css::uno::Any SAL_CALL convertToControlValue( const OUString& _rPropertyName, const css::uno::Any& _rPropertyValue, const css::uno::Type& _rControlValueType ) override;
+        virtual css::beans::PropertyState
+                                                    SAL_CALL getPropertyState( const OUString& _rPropertyName ) override;
+        virtual void                                SAL_CALL addPropertyChangeListener( const css::uno::Reference< css::beans::XPropertyChangeListener >& _rxListener ) override;
+        virtual void                                SAL_CALL removePropertyChangeListener( const css::uno::Reference< css::beans::XPropertyChangeListener >& _rxListener ) override;
+        virtual css::uno::Sequence< css::beans::Property >
+                                                    SAL_CALL getSupportedProperties() override;
+        virtual css::uno::Sequence< OUString >
+                                                    SAL_CALL getSupersededProperties( ) override;
+        virtual css::uno::Sequence< OUString >
+                                                    SAL_CALL getActuatingProperties( ) override;
+        virtual css::inspection::LineDescriptor
+                                                    SAL_CALL describePropertyLine( const OUString& _rPropertyName, const css::uno::Reference< css::inspection::XPropertyControlFactory >& _rxControlFactory ) override;
+        virtual sal_Bool                            SAL_CALL isComposable( const OUString& _rPropertyName ) override;
+        virtual css::inspection::InteractiveSelectionResult
+                                                    SAL_CALL onInteractivePropertySelection( const OUString& _rPropertyName, sal_Bool _bPrimary, css::uno::Any& _rData, const css::uno::Reference< css::inspection::XObjectInspectorUI >& _rxInspectorUI ) override;
+        virtual void                                SAL_CALL actuatingPropertyChanged( const OUString& _rActuatingPropertyName, const css::uno::Any& _rNewValue, const css::uno::Any& _rOldValue, const css::uno::Reference< css::inspection::XObjectInspectorUI >& _rxInspectorUI, sal_Bool _bFirstTimeInit ) override;
+        virtual sal_Bool                            SAL_CALL suspend( sal_Bool _bSuspend ) override;
+
+        // XComponent
+        DECLARE_XCOMPONENT()
+        virtual void                                SAL_CALL disposing() override;
+
+        // XPropertyChangeListener
+        virtual void SAL_CALL propertyChange( const css::beans::PropertyChangeEvent& evt ) override;
+
+        // XEventListener
+        virtual void SAL_CALL disposing( const css::lang::EventObject& Source ) override;
+
+        // IPropertyExistenceCheck
+        virtual bool hasPropertyByName( const OUString& _rName ) override;
+
+    private:
+        /** ensures that m_pUIRequestComposer exists
+        */
+        void    impl_ensureUIRequestComposer( const css::uno::Reference< css::inspection::XObjectInspectorUI >& _rxInspectorUI );
+
+        /** checks whether a given property exists in <member>m_aSupportedProperties</member>
+        */
+        bool    impl_isSupportedProperty_nothrow( const OUString& _rPropertyName )
+        {
+            css::beans::Property aDummy; aDummy.Name = _rPropertyName;
+            return m_aSupportedProperties.find( aDummy ) != m_aSupportedProperties.end();
+        }
+
+    private:
+        class MethodGuard;
+        friend class MethodGuard;
+        class MethodGuard : public ::osl::MutexGuard
+        {
+        public:
+            explicit MethodGuard( PropertyComposer& _rInstance )
+                : ::osl::MutexGuard( _rInstance.m_aMutex )
+            {
+                if ( _rInstance.m_aSlaveHandlers.empty() )
+                    throw css::lang::DisposedException( OUString(), _rInstance );
+            }
+        };
+    };
+
+
+} // namespace pcr
+
+
+#endif // INCLUDED_EXTENSIONS_SOURCE_PROPCTRLR_PROPERTYCOMPOSER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */