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diff --git a/sfx2/source/sidebar/SidebarController.hxx b/sfx2/source/sidebar/SidebarController.hxx
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+/*
+ * 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 SFX_SIDEBAR_CONTROLLER_HXX
+#define SFX_SIDEBAR_CONTROLLER_HXX
+
+#include "AsynchronousCall.hxx"
+#include "Context.hxx"
+#include "FocusManager.hxx"
+#include "Panel.hxx"
+#include "ResourceManager.hxx"
+#include "TabBar.hxx"
+
+#include <vcl/menu.hxx>
+
+#include <com/sun/star/awt/XWindowPeer.hpp>
+#include <com/sun/star/beans/XPropertyChangeListener.hpp>
+#include <com/sun/star/ui/XContextChangeEventListener.hpp>
+#include <com/sun/star/ui/XUIElement.hpp>
+#include <com/sun/star/ui/XSidebar.hpp>
+
+#include <boost/noncopyable.hpp>
+#include <cppuhelper/compbase3.hxx>
+#include <cppuhelper/basemutex.hxx>
+
+namespace css = ::com::sun::star;
+namespace cssu = ::com::sun::star::uno;
+
+
+namespace
+{
+    typedef ::cppu::WeakComponentImplHelper3 <
+        css::ui::XContextChangeEventListener,
+        css::beans::XPropertyChangeListener,
+        css::ui::XSidebar
+        > SidebarControllerInterfaceBase;
+}
+
+namespace sfx2 { namespace sidebar {
+
+class ContentPanelDescriptor;
+class Deck;
+class DeckDescriptor;
+class SidebarDockingWindow;
+class TabBar;
+class TabBarConfiguration;
+
+class SidebarController
+    : private ::boost::noncopyable,
+      private ::cppu::BaseMutex,
+      public SidebarControllerInterfaceBase
+{
+public:
+    SidebarController(
+        SidebarDockingWindow* pParentWindow,
+        const cssu::Reference<css::frame::XFrame>& rxFrame);
+    virtual ~SidebarController (void);
+
+    // ui::XContextChangeEventListener
+    virtual void SAL_CALL notifyContextChangeEvent (const css::ui::ContextChangeEventObject& rEvent)
+        throw(cssu::RuntimeException);
+
+    // XEventListener
+    virtual void SAL_CALL disposing (const css::lang::EventObject& rEventObject)
+        throw(cssu::RuntimeException);
+
+    // beans::XPropertyChangeListener
+    virtual void SAL_CALL propertyChange (const css::beans::PropertyChangeEvent& rEvent)
+        throw(cssu::RuntimeException);
+
+    // ui::XSidebar
+    virtual void SAL_CALL requestLayout (void)
+        throw(cssu::RuntimeException);
+
+    void NotifyResize (void);
+
+    void SwitchToDeck (
+        const ::rtl::OUString& rsDeckId);
+
+    /** Show only the tab bar, not the deck.
+    */
+    void CloseDeck (void);
+
+    /** Open the deck area and restore the parent window to its old width.
+    */
+    void OpenDeck (void);
+
+    FocusManager& GetFocusManager (void);
+
+private:
+    ::boost::scoped_ptr<Deck> mpCurrentDeck;
+    SidebarDockingWindow* mpParentWindow;
+    ::boost::scoped_ptr<TabBar> mpTabBar;
+    cssu::Reference<css::frame::XFrame> mxFrame;
+    Context maCurrentContext;
+    ::rtl::OUString msCurrentDeckId;
+    ::rtl::OUString msCurrentDeckTitle;
+    AsynchronousCall maPropertyChangeForwarder;
+    bool mbIsDeckClosed;
+    /** Before the deck is closed the sidebar width is saved into this variable,
+        so that it can be restored when the deck is reopended.
+    */
+    sal_Int32 mnSavedSidebarWidth;
+    FocusManager maFocusManager;
+
+    DECL_LINK(WindowEventHandler, VclWindowEvent*);
+    void UpdateConfigurations (const Context& rContext);
+    bool ArePanelSetsEqual (
+        const SharedPanelContainer& rCurrentPanels,
+        const ResourceManager::PanelContextDescriptorContainer& rRequestedPanels);
+    cssu::Reference<css::ui::XUIElement> CreateUIElement (
+        const cssu::Reference<css::awt::XWindowPeer>& rxWindow,
+        const ::rtl::OUString& rsImplementationURL);
+    SharedPanel CreatePanel (
+        const ::rtl::OUString& rsPanelId,
+        ::Window* pParentWindow,
+        const ::rtl::OUString& rsMenuCommand);
+    void SwitchToDeck (
+        const DeckDescriptor& rDeckDescriptor,
+        const Context& rContext);
+    void ShowPopupMenu (
+        const Rectangle& rButtonBox,
+        const ::std::vector<TabBar::DeckMenuData>& rDeckSelectionData,
+        const ::std::vector<TabBar::DeckMenuData>& rDeckShowData) const;
+    void ShowDetailMenu (const ::rtl::OUString& rsMenuCommand) const;
+    ::boost::shared_ptr<PopupMenu> CreatePopupMenu (
+        const ::std::vector<TabBar::DeckMenuData>& rDeckSelectionData,
+        const ::std::vector<TabBar::DeckMenuData>& rDeckShowData) const;
+    DECL_LINK(OnMenuItemSelected, Menu*);
+    void BroadcastPropertyChange (void);
+
+    /** The close of the deck changes the width of the child window.
+        That is only possible if there is no other docking window docked above or below the sidebar.
+        Return whether the width of the child window can be modified.
+    */
+    bool CanModifyChildWindowWidth (void) const;
+
+    /** Set the child window container to a new width.
+        Return the old width.
+    */
+    sal_Int32 SetChildWindowWidth (const sal_Int32 nNewWidth);
+
+    void RestrictWidth (void);
+
+    virtual void SAL_CALL disposing (void);
+};
+
+
+} } // end of namespace sfx2::sidebar
+
+#endif