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diff --git a/dtrans/source/win32/clipb/WinClipboard.hxx b/dtrans/source/win32/clipb/WinClipboard.hxx
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+++ b/dtrans/source/win32/clipb/WinClipboard.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_DTRANS_SOURCE_WIN32_CLIPB_WINCLIPBOARD_HXX
+#define INCLUDED_DTRANS_SOURCE_WIN32_CLIPB_WINCLIPBOARD_HXX
+
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+#include <cppuhelper/compbase.hxx>
+#include <com/sun/star/datatransfer/XTransferable.hpp>
+#include <com/sun/star/datatransfer/clipboard/XClipboardEx.hpp>
+#include <com/sun/star/datatransfer/clipboard/XClipboardOwner.hpp>
+#include <com/sun/star/datatransfer/clipboard/XClipboardListener.hpp>
+#include <com/sun/star/datatransfer/clipboard/XClipboardNotifier.hpp>
+#include <com/sun/star/datatransfer/clipboard/XSystemClipboard.hpp>
+#include <com/sun/star/datatransfer/clipboard/XFlushableClipboard.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <osl/conditn.hxx>
+
+#include <memory>
+
+// forward
+class CWinClipbImpl;
+
+// implements the XClipboard[Ex] ... interfaces
+// for the clipboard viewer mechanism we need a static callback function
+// and a static member to reassociate from this static function to the
+// class instance
+// watch out: we are using only one static member variable and not a list
+// because we assume to be instantiated only once
+// this will be assured by a OneInstanceFactory of the service and not
+// by this class!
+
+// helper class, so that the mutex is constructed
+// before the constructor of WeakComponentImplHelper
+// will be called and initialized with this mutex
+class CWinClipboardDummy
+{
+protected:
+    osl::Mutex      m_aMutex;
+    osl::Mutex      m_aCbListenerMutex;
+};
+
+class CWinClipboard :
+    public CWinClipboardDummy,
+    public cppu::WeakComponentImplHelper<
+        css::datatransfer::clipboard::XSystemClipboard,
+        css::datatransfer::clipboard::XFlushableClipboard,
+        css::lang::XServiceInfo >
+{
+public:
+    CWinClipboard( const css::uno::Reference< css::uno::XComponentContext >& rxContext,
+                   const OUString& aClipboardName );
+
+    // XClipboard
+
+    virtual css::uno::Reference< css::datatransfer::XTransferable > SAL_CALL getContents(  ) override;
+
+    virtual void SAL_CALL setContents(
+        const css::uno::Reference< css::datatransfer::XTransferable >& xTransferable,
+        const css::uno::Reference< css::datatransfer::clipboard::XClipboardOwner >& xClipboardOwner ) override;
+
+    virtual OUString SAL_CALL getName(  ) override;
+
+    // XFlushableClipboard
+
+    virtual void SAL_CALL flushClipboard( ) override;
+
+    // XClipboardEx
+
+    virtual sal_Int8 SAL_CALL getRenderingCapabilities(  ) override;
+
+    // XClipboardNotifier
+
+    virtual void SAL_CALL addClipboardListener(
+        const css::uno::Reference< css::datatransfer::clipboard::XClipboardListener >& listener ) override;
+
+    virtual void SAL_CALL removeClipboardListener(
+        const css::uno::Reference< css::datatransfer::clipboard::XClipboardListener >& listener ) override;
+
+    // overwrite base class method, which is called
+    // by base class dispose function
+
+    virtual void SAL_CALL disposing() override;
+
+    // XServiceInfo
+
+    virtual OUString SAL_CALL getImplementationName(  ) override;
+
+    virtual sal_Bool SAL_CALL supportsService( const OUString& ServiceName ) override;
+
+    virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames(  ) override;
+
+private:
+    void notifyAllClipboardListener( );
+
+private:
+    std::unique_ptr< CWinClipbImpl >                  m_pImpl;
+    css::uno::Reference< css::uno::XComponentContext >  m_xContext;
+
+    friend class CWinClipbImpl;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */