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diff --git a/include/sfx2/sidebar/Panel.hxx b/include/sfx2/sidebar/Panel.hxx
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+++ b/include/sfx2/sidebar/Panel.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_SOURCE_SIDEBAR_PANEL_HXX
+#define INCLUDED_SFX2_SOURCE_SIDEBAR_PANEL_HXX
+
+#include <sfx2/dllapi.h>
+
+#include <vcl/window.hxx>
+
+#include <vector>
+
+namespace com::sun::star::frame { class XFrame; }
+namespace com::sun::star::ui { class XSidebarPanel; }
+namespace com::sun::star::ui { class XUIElement; }
+namespace com::sun::star::awt { class XWindow; }
+
+namespace sfx2::sidebar {
+
+class PanelDescriptor;
+class PanelTitleBar;
+class Context;
+
+/**
+ * Multiple panels form a single deck.
+ * E.g. the Properties deck has panels like Styles, Character, paragraph.
+ */
+class SFX2_DLLPUBLIC Panel final : public vcl::Window
+{
+public:
+    Panel(const PanelDescriptor& rPanelDescriptor, vcl::Window* pParentWindow,
+          const bool bIsInitiallyExpanded, const std::function<void()>& rDeckLayoutTrigger,
+          const std::function<Context()>& rContextAccess,
+          const css::uno::Reference<css::frame::XFrame>& rxFrame);
+
+    virtual ~Panel() override;
+    virtual void dispose() override;
+
+    VclPtr<PanelTitleBar> const & GetTitleBar() const;
+    bool IsTitleBarOptional() const { return mbIsTitleBarOptional;}
+    void SetUIElement (const css::uno::Reference<css::ui::XUIElement>& rxElement);
+    const css::uno::Reference<css::ui::XSidebarPanel>& GetPanelComponent() const { return mxPanelComponent;}
+    css::uno::Reference<css::awt::XWindow> GetElementWindow();
+    void SetExpanded (const bool bIsExpanded);
+    bool IsExpanded() const { return mbIsExpanded;}
+    bool HasIdPredicate (const OUString& rsId) const;
+    const OUString& GetId() const { return msPanelId;}
+    void TriggerDeckLayouting() { maDeckLayoutTrigger(); }
+
+    /// Set whether a panel should be present but invisible / inactive
+    void SetLurkMode(bool bLurk);
+    bool IsLurking() const { return mbLurking; }
+
+    virtual void Resize() override;
+    virtual void DataChanged (const DataChangedEvent& rEvent) override;
+    virtual void ApplySettings(vcl::RenderContext& rRenderContext) override;
+    virtual boost::property_tree::ptree DumpAsPropertyTree() override;
+
+private:
+    const OUString msPanelId;
+    VclPtr<PanelTitleBar> mpTitleBar;
+    const bool mbIsTitleBarOptional;
+    css::uno::Reference<css::ui::XUIElement> mxElement;
+    css::uno::Reference<css::ui::XSidebarPanel> mxPanelComponent;
+    bool mbIsExpanded;
+    bool mbLurking;
+    const std::function<void()> maDeckLayoutTrigger;
+    const std::function<Context()> maContextAccess;
+
+    const css::uno::Reference<css::frame::XFrame>& mxFrame;
+
+};
+typedef std::vector<VclPtr<Panel> > SharedPanelContainer;
+
+} // end of namespace sfx2::sidebar
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */