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diff --git a/include/sfx2/sidebar/ControllerItem.hxx b/include/sfx2/sidebar/ControllerItem.hxx
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+++ b/include/sfx2/sidebar/ControllerItem.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 .
+ */
+#pragma once
+
+#include <sfx2/ctrlitem.hxx>
+
+namespace com::sun::star::lang { class XComponent; }
+
+
+namespace sfx2::sidebar {
+
+/** The sfx2::sidebar::ControllerItem is a wrapper around the
+    SfxControllerItem that becomes necessary to allow objects (think
+    sidebar panels) to receive state changes without having one
+    SfxControllerItem per supported item as base class (which is not
+    possible in C++ anyway).
+
+    It also gives access to the label and icon of a slot/command.
+*/
+class SFX2_DLLPUBLIC ControllerItem final
+    : public SfxControllerItem
+{
+public:
+    class SFX2_DLLPUBLIC ItemUpdateReceiverInterface
+    {
+    public:
+        virtual void NotifyItemUpdate(
+            const sal_uInt16 nSId,
+            const SfxItemState eState,
+            const SfxPoolItem* pState) = 0;
+        virtual void GetControlState(
+            const sal_uInt16 nSId,
+            boost::property_tree::ptree& rState) = 0;
+        virtual ~ItemUpdateReceiverInterface();
+    };
+
+    /** This is the simpler constructor variant that still exists for
+        compatibility reasons. Note that GetLabel() and GetIcon() will
+        return empty strings/images.
+    */
+    ControllerItem (
+        const sal_uInt16 nId,
+        SfxBindings &rBindings,
+        ItemUpdateReceiverInterface& rItemUpdateReceiver);
+
+    virtual ~ControllerItem() override;
+
+    /** Force the controller item to call its NotifyItemUpdate
+        callback with up-to-date data.
+    */
+    void RequestUpdate();
+
+private:
+
+    virtual void StateChangedAtToolBoxControl (sal_uInt16 nSId, SfxItemState eState, const SfxPoolItem* pState) override;
+    virtual void GetControlState (sal_uInt16 nSId, boost::property_tree::ptree& rState) override;
+
+    ItemUpdateReceiverInterface& mrItemUpdateReceiver;
+};
+
+} // end of namespace sfx2::sidebar
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */