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diff --git a/include/sfx2/sidebar/SidebarPanelBase.hxx b/include/sfx2/sidebar/SidebarPanelBase.hxx
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+++ b/include/sfx2/sidebar/SidebarPanelBase.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_SIDEBAR_SIDEBARPANELBASE_HXX
+#define INCLUDED_SFX2_SIDEBAR_SIDEBARPANELBASE_HXX
+
+#include <sfx2/dllapi.h>
+
+#include <cppuhelper/compbase.hxx>
+#include <cppuhelper/basemutex.hxx>
+
+#include <com/sun/star/ui/XContextChangeEventListener.hpp>
+#include <com/sun/star/ui/XUIElement.hpp>
+#include <com/sun/star/ui/XToolPanel.hpp>
+#include <com/sun/star/ui/XSidebarPanel.hpp>
+#include <com/sun/star/ui/XUpdateModel.hpp>
+
+#include <vcl/vclptr.hxx>
+
+
+namespace vcl { class Window; }
+
+namespace sfx2::sidebar {
+
+typedef cppu::WeakComponentImplHelper<css::ui::XContextChangeEventListener,
+                                       css::ui::XUIElement,
+                                       css::ui::XToolPanel,
+                                       css::ui::XSidebarPanel,
+                                       css::ui::XUpdateModel>
+            SidebarPanelBaseInterfaceBase;
+
+/** Base class for sidebar panels that provides some convenience
+    functionality.
+*/
+class SFX2_DLLPUBLIC SidebarPanelBase final : private ::cppu::BaseMutex,
+                                        public SidebarPanelBaseInterfaceBase
+{
+public:
+    static css::uno::Reference<css::ui::XUIElement> Create(const OUString& rsResourceURL,
+                                                           const css::uno::Reference<css::frame::XFrame>& rxFrame,
+                                                           vcl::Window* pControl,
+                                                           const css::ui::LayoutSize& rLayoutSize);
+
+    // XContextChangeEventListener
+    virtual void SAL_CALL notifyContextChangeEvent (const css::ui::ContextChangeEventObject& rEvent) override;
+
+    // XEventListener
+    virtual void SAL_CALL disposing (const css::lang::EventObject& rEvent) override;
+
+    // XUIElement
+    virtual css::uno::Reference<css::frame::XFrame> SAL_CALL getFrame() override;
+    virtual OUString SAL_CALL getResourceURL() override;
+    virtual sal_Int16 SAL_CALL getType() override;
+    virtual css::uno::Reference<css::uno::XInterface> SAL_CALL getRealInterface() override;
+
+    // XToolPanel
+    virtual css::uno::Reference<css::accessibility::XAccessible> SAL_CALL createAccessible(
+                const css::uno::Reference<css::accessibility::XAccessible>& rxParentAccessible) override;
+    virtual css::uno::Reference<css::awt::XWindow> SAL_CALL getWindow() override;
+
+    // XSidebarPanel
+    virtual css::ui::LayoutSize SAL_CALL getHeightForWidth(sal_Int32 nWidth) override;
+    virtual sal_Int32 SAL_CALL getMinimalWidth() override;
+
+    // XUpdateModel
+    virtual void SAL_CALL updateModel(const css::uno::Reference<css::frame::XModel>& xModel) override;
+
+private:
+    SidebarPanelBase(const OUString& rsResourceURL, const css::uno::Reference<css::frame::XFrame>& rxFrame,
+                     vcl::Window* pWindow, const css::ui::LayoutSize& rLayoutSize);
+    virtual ~SidebarPanelBase() override;
+    SidebarPanelBase(const SidebarPanelBase&) = delete;
+    SidebarPanelBase& operator=( const SidebarPanelBase& ) = delete;
+
+    virtual void SAL_CALL disposing() override;
+
+    css::uno::Reference<css::frame::XFrame> mxFrame;
+    VclPtr<vcl::Window> mpControl;
+    const OUString msResourceURL;
+    const css::ui::LayoutSize maLayoutSize;
+};
+
+} // end of namespace sfx2::sidebar
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */