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diff --git a/sfx2/inc/sidebar/ContextChangeBroadcaster.hxx b/sfx2/inc/sidebar/ContextChangeBroadcaster.hxx
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+++ b/sfx2/inc/sidebar/ContextChangeBroadcaster.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_INC_SIDEBAR_CONTEXTCHANGEBROADCASTER_HXX
+#define INCLUDED_SFX2_INC_SIDEBAR_CONTEXTCHANGEBROADCASTER_HXX
+
+#include <com/sun/star/frame/XFrame.hpp>
+
+
+namespace sfx2::sidebar {
+
+
+/** This class is a helper for broadcasting context changes that are
+    tied to shells being activated or deactivated.
+*/
+class ContextChangeBroadcaster
+{
+public:
+    ContextChangeBroadcaster();
+    ~ContextChangeBroadcaster();
+
+    void Initialize (const OUString& rsContextName);
+
+    void Activate (const css::uno::Reference<css::frame::XFrame>& rxFrame);
+    void Deactivate (const css::uno::Reference<css::frame::XFrame>& rxFrame);
+
+    /** Enable or disable the broadcaster.
+        @param bIsEnabled
+            The new value of the "enabled" state.
+        @return
+            The old value of the "enabled" state is returned.
+    */
+    bool SetBroadcasterEnabled (const bool bIsEnabled);
+
+private:
+    OUString msContextName;
+    bool mbIsBroadcasterEnabled;
+
+    void BroadcastContextChange (
+        const css::uno::Reference<css::frame::XFrame>& rxFrame,
+        const OUString& rsModuleName,
+        const OUString& rsContextName);
+    static OUString GetModuleName (
+        const css::uno::Reference<css::frame::XFrame>& rxFrame);
+};
+
+
+} // end of namespace ::sd::sidebar
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */