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diff --git a/sd/source/ui/tools/EventMultiplexer.cxx b/sd/source/ui/tools/EventMultiplexer.cxx
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+++ b/sd/source/ui/tools/EventMultiplexer.cxx
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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 .
+ */
+
+#include <EventMultiplexer.hxx>
+
+#include <ViewShellBase.hxx>
+#include <drawdoc.hxx>
+#include <DrawController.hxx>
+#include <SlideSorterViewShell.hxx>
+#include <framework/FrameworkHelper.hxx>
+#include <sal/log.hxx>
+#include <tools/debug.hxx>
+
+#include <com/sun/star/beans/XPropertySet.hpp>
+#include <com/sun/star/frame/XFrame.hpp>
+#include <com/sun/star/lang/DisposedException.hpp>
+#include <com/sun/star/drawing/framework/XConfigurationChangeListener.hpp>
+#include <com/sun/star/drawing/framework/XView.hpp>
+#include <comphelper/compbase.hxx>
+#include <sfx2/viewfrm.hxx>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::lang;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::drawing::framework;
+
+using ::sd::framework::FrameworkHelper;
+
+class SdDrawDocument;
+
+namespace {
+const sal_Int32 ResourceActivationEvent = 0;
+const sal_Int32 ResourceDeactivationEvent = 1;
+const sal_Int32 ConfigurationUpdateEvent = 2;
+}
+
+namespace sd::tools {
+
+typedef comphelper::WeakComponentImplHelper<
+      css::beans::XPropertyChangeListener,
+      css::frame::XFrameActionListener,
+      css::view::XSelectionChangeListener,
+      css::drawing::framework::XConfigurationChangeListener
+    > EventMultiplexerImplementationInterfaceBase;
+
+class EventMultiplexer::Implementation
+    : public EventMultiplexerImplementationInterfaceBase,
+      public SfxListener
+{
+public:
+    explicit Implementation (ViewShellBase& rBase);
+    virtual ~Implementation() override;
+
+    void AddEventListener (
+        const Link<EventMultiplexerEvent&,void>& rCallback);
+
+    void RemoveEventListener (
+        const Link<EventMultiplexerEvent&,void>& rCallback);
+
+    void CallListeners (EventMultiplexerEvent& rEvent);
+
+    //===== lang::XEventListener ==============================================
+    virtual void SAL_CALL
+        disposing (const css::lang::EventObject& rEventObject) override;
+
+    //===== beans::XPropertySetListener =======================================
+    virtual void SAL_CALL
+        propertyChange (
+            const css::beans::PropertyChangeEvent& rEvent) override;
+
+    //===== view::XSelectionChangeListener ====================================
+    virtual void SAL_CALL
+        selectionChanged (
+            const css::lang::EventObject& rEvent) override;
+
+    //===== frame::XFrameActionListener  ======================================
+    /** For certain actions the listener connects to a new controller of the
+        frame it is listening to.  This usually happens when the view shell
+        in the center pane is replaced by another view shell.
+    */
+    virtual void SAL_CALL
+        frameAction (const css::frame::FrameActionEvent& rEvent) override;
+
+    //===== drawing::framework::XConfigurationChangeListener ==================
+    virtual void SAL_CALL
+        notifyConfigurationChange (
+            const css::drawing::framework::ConfigurationChangeEvent& rEvent) override;
+
+    virtual void disposing(std::unique_lock<std::mutex>&) override;
+
+protected:
+    virtual void Notify (
+        SfxBroadcaster& rBroadcaster,
+        const SfxHint& rHint) override;
+
+private:
+    ViewShellBase& mrBase;
+    typedef ::std::vector<Link<EventMultiplexerEvent&,void>> ListenerList;
+    ListenerList maListeners;
+
+    /// Remember whether we are listening to the UNO controller.
+    bool mbListeningToController;
+    /// Remember whether we are listening to the frame.
+    bool mbListeningToFrame;
+
+    css::uno::WeakReference<css::frame::XController> mxControllerWeak;
+    css::uno::WeakReference<css::frame::XFrame> mxFrameWeak;
+    SdDrawDocument* mpDocument;
+    css::uno::WeakReference<css::drawing::framework::XConfigurationController>
+         mxConfigurationControllerWeak;
+
+    void ReleaseListeners();
+
+    void ConnectToController();
+    void DisconnectFromController();
+
+    void CallListeners (
+        EventMultiplexerEventId eId,
+        void const * pUserData = nullptr);
+
+    DECL_LINK(SlideSorterSelectionChangeListener, LinkParamNone*, void);
+};
+
+constexpr OUStringLiteral aCurrentPagePropertyName = u"CurrentPage";
+constexpr OUStringLiteral aEditModePropertyName = u"IsMasterPageMode";
+
+//===== EventMultiplexer ======================================================
+
+EventMultiplexer::EventMultiplexer (ViewShellBase& rBase)
+    : mpImpl (new EventMultiplexer::Implementation(rBase))
+{
+}
+
+EventMultiplexer::~EventMultiplexer()
+{
+    try
+    {
+        mpImpl->dispose();
+    }
+    catch (const RuntimeException&)
+    {
+    }
+    catch (const Exception&)
+    {
+    }
+}
+
+void EventMultiplexer::AddEventListener (
+    const Link<EventMultiplexerEvent&,void>& rCallback)
+{
+    mpImpl->AddEventListener(rCallback);
+}
+
+void EventMultiplexer::RemoveEventListener (
+    const Link<EventMultiplexerEvent&,void>& rCallback)
+{
+    mpImpl->RemoveEventListener(rCallback);
+}
+
+void EventMultiplexer::MultiplexEvent(
+    EventMultiplexerEventId eEventId,
+    void const * pUserData )
+{
+    EventMultiplexerEvent aEvent(eEventId, pUserData);
+    mpImpl->CallListeners(aEvent);
+}
+
+//===== EventMultiplexer::Implementation ======================================
+
+EventMultiplexer::Implementation::Implementation (ViewShellBase& rBase)
+    : mrBase (rBase),
+      mbListeningToController (false),
+      mbListeningToFrame (false),
+      mxControllerWeak(nullptr),
+      mxFrameWeak(nullptr),
+      mpDocument(nullptr)
+{
+    // Connect to the frame to listen for controllers being exchanged.
+    // Listen to changes of certain properties.
+    Reference<frame::XFrame> xFrame =
+        mrBase.GetFrame()->GetFrame().GetFrameInterface();
+    mxFrameWeak = xFrame;
+    if (xFrame.is())
+    {
+        xFrame->addFrameActionListener ( Reference<frame::XFrameActionListener>(this) );
+        mbListeningToFrame = true;
+    }
+
+    // Connect to the current controller.
+    ConnectToController ();
+
+    // Listen for document changes.
+    mpDocument = mrBase.GetDocument();
+    if (mpDocument != nullptr)
+        StartListening (*mpDocument);
+
+    // Listen for configuration changes.
+    Reference<XControllerManager> xControllerManager (
+        Reference<XWeak>(&mrBase.GetDrawController()), UNO_QUERY);
+    if (!xControllerManager.is())
+        return;
+
+    Reference<XConfigurationController> xConfigurationController (
+        xControllerManager->getConfigurationController());
+    mxConfigurationControllerWeak = xConfigurationController;
+    if (!xConfigurationController.is())
+        return;
+
+    Reference<XComponent> xComponent (xConfigurationController, UNO_QUERY);
+    if (xComponent.is())
+        xComponent->addEventListener(static_cast<beans::XPropertyChangeListener*>(this));
+
+    xConfigurationController->addConfigurationChangeListener(
+        this,
+        FrameworkHelper::msResourceActivationEvent,
+        Any(ResourceActivationEvent));
+    xConfigurationController->addConfigurationChangeListener(
+        this,
+        FrameworkHelper::msResourceDeactivationEvent,
+        Any(ResourceDeactivationEvent));
+    xConfigurationController->addConfigurationChangeListener(
+        this,
+        FrameworkHelper::msConfigurationUpdateEndEvent,
+        Any(ConfigurationUpdateEvent));
+}
+
+EventMultiplexer::Implementation::~Implementation()
+{
+    DBG_ASSERT( !mbListeningToFrame,
+        "sd::EventMultiplexer::Implementation::~Implementation(), disposing was not called!" );
+}
+
+void EventMultiplexer::Implementation::ReleaseListeners()
+{
+    if (mbListeningToFrame)
+    {
+        mbListeningToFrame = false;
+
+        // Stop listening for changes of certain properties.
+        Reference<frame::XFrame> xFrame (mxFrameWeak);
+        if (xFrame.is())
+        {
+            xFrame->removeFrameActionListener (
+                Reference<frame::XFrameActionListener>(this) );
+        }
+    }
+
+    DisconnectFromController ();
+
+    if (mpDocument != nullptr)
+    {
+        EndListening (*mpDocument);
+        mpDocument = nullptr;
+    }
+
+    // Stop listening for configuration changes.
+    Reference<XConfigurationController> xConfigurationController (mxConfigurationControllerWeak);
+    if (xConfigurationController.is())
+    {
+        Reference<XComponent> xComponent (xConfigurationController, UNO_QUERY);
+        if (xComponent.is())
+            xComponent->removeEventListener(static_cast<beans::XPropertyChangeListener*>(this));
+
+        xConfigurationController->removeConfigurationChangeListener(this);
+    }
+}
+
+void EventMultiplexer::Implementation::AddEventListener (
+    const Link<EventMultiplexerEvent&,void>& rCallback)
+{
+    for (auto const & i : maListeners)
+        if (i == rCallback)
+            return;
+    maListeners.push_back(rCallback);
+}
+
+void EventMultiplexer::Implementation::RemoveEventListener (
+    const Link<EventMultiplexerEvent&,void>& rCallback)
+{
+    auto iListener = std::find(maListeners.begin(), maListeners.end(), rCallback);
+    if (iListener != maListeners.end())
+        maListeners.erase(iListener);
+}
+
+void EventMultiplexer::Implementation::ConnectToController()
+{
+    // Just in case that we missed some event we now disconnect from the old
+    // controller.
+    DisconnectFromController ();
+
+    // Register at the controller of the main view shell.
+
+    // We have to store a (weak) reference to the controller so that we can
+    // unregister without having to ask the mrBase member (which at that
+    // time may be destroyed.)
+    Reference<frame::XController> xController = mrBase.GetController();
+    mxControllerWeak = mrBase.GetController();
+
+    try
+    {
+        // Listen for disposing events.
+        if (xController.is())
+        {
+            xController->addEventListener (
+                Reference<lang::XEventListener>(
+                    static_cast<XWeak*>(this), UNO_QUERY));
+            mbListeningToController = true;
+        }
+
+        // Listen to changes of certain properties.
+        Reference<beans::XPropertySet> xSet (xController, UNO_QUERY);
+        if (xSet.is())
+        {
+                try
+                {
+                    xSet->addPropertyChangeListener(aCurrentPagePropertyName, this);
+                }
+                catch (const beans::UnknownPropertyException&)
+                {
+                    SAL_WARN("sd", "EventMultiplexer::ConnectToController: CurrentPage unknown");
+                }
+
+                try
+                {
+                    xSet->addPropertyChangeListener(aEditModePropertyName, this);
+                }
+                catch (const beans::UnknownPropertyException&)
+                {
+                    SAL_WARN("sd", "EventMultiplexer::ConnectToController: IsMasterPageMode unknown");
+                }
+        }
+
+        // Listen for selection change events.
+        Reference<view::XSelectionSupplier> xSelection (xController, UNO_QUERY);
+        if (xSelection.is())
+        {
+            xSelection->addSelectionChangeListener(this);
+        }
+    }
+    catch (const lang::DisposedException&)
+    {
+        mbListeningToController = false;
+    }
+}
+
+void EventMultiplexer::Implementation::DisconnectFromController()
+{
+    if (!mbListeningToController)
+        return;
+
+    mbListeningToController = false;
+
+    Reference<frame::XController> xController = mxControllerWeak;
+
+    Reference<beans::XPropertySet> xSet (xController, UNO_QUERY);
+    // Remove the property listener.
+    if (xSet.is())
+    {
+        try
+        {
+            xSet->removePropertyChangeListener(aCurrentPagePropertyName, this);
+        }
+        catch (const beans::UnknownPropertyException&)
+        {
+            SAL_WARN("sd", "DisconnectFromController: CurrentPage unknown");
+        }
+
+        try
+        {
+            xSet->removePropertyChangeListener(aEditModePropertyName, this);
+        }
+        catch (const beans::UnknownPropertyException&)
+        {
+            SAL_WARN("sd", "DisconnectFromController: IsMasterPageMode unknown");
+        }
+    }
+
+    // Remove selection change listener.
+    Reference<view::XSelectionSupplier> xSelection (xController, UNO_QUERY);
+    if (xSelection.is())
+    {
+        xSelection->removeSelectionChangeListener(this);
+    }
+
+    // Remove listener for disposing events.
+    if (xController.is())
+    {
+        xController->removeEventListener (
+            Reference<lang::XEventListener>(static_cast<XWeak*>(this), UNO_QUERY));
+    }
+}
+
+//=====  lang::XEventListener  ================================================
+
+void SAL_CALL EventMultiplexer::Implementation::disposing (
+    const lang::EventObject& rEventObject)
+{
+    if (mbListeningToController)
+    {
+        Reference<frame::XController> xController (mxControllerWeak);
+        if (rEventObject.Source == xController)
+        {
+            mbListeningToController = false;
+        }
+    }
+
+    Reference<XConfigurationController> xConfigurationController (
+        mxConfigurationControllerWeak);
+    if (xConfigurationController.is()
+        && rEventObject.Source == xConfigurationController)
+    {
+        mxConfigurationControllerWeak.clear();
+    }
+}
+
+//=====  beans::XPropertySetListener  =========================================
+
+void SAL_CALL EventMultiplexer::Implementation::propertyChange (
+    const beans::PropertyChangeEvent& rEvent)
+{
+    if (m_bDisposed)
+    {
+        throw lang::DisposedException (
+            "SlideSorterController object has already been disposed",
+            static_cast<uno::XWeak*>(this));
+    }
+
+    if ( rEvent.PropertyName == aCurrentPagePropertyName )
+    {
+        CallListeners(EventMultiplexerEventId::CurrentPageChanged);
+    }
+    else if ( rEvent.PropertyName == aEditModePropertyName )
+    {
+        bool bIsMasterPageMode (false);
+        rEvent.NewValue >>= bIsMasterPageMode;
+        if (bIsMasterPageMode)
+            CallListeners(EventMultiplexerEventId::EditModeMaster);
+        else
+            CallListeners(EventMultiplexerEventId::EditModeNormal);
+    }
+}
+
+//===== frame::XFrameActionListener  ==========================================
+
+void SAL_CALL EventMultiplexer::Implementation::frameAction (
+    const frame::FrameActionEvent& rEvent)
+{
+    Reference<frame::XFrame> xFrame (mxFrameWeak);
+    if (rEvent.Frame != xFrame)
+        return;
+
+    switch (rEvent.Action)
+    {
+        case frame::FrameAction_COMPONENT_DETACHING:
+            DisconnectFromController();
+            CallListeners (EventMultiplexerEventId::ControllerDetached);
+            break;
+
+        case frame::FrameAction_COMPONENT_REATTACHED:
+            CallListeners (EventMultiplexerEventId::ControllerDetached);
+            DisconnectFromController();
+            ConnectToController();
+            CallListeners (EventMultiplexerEventId::ControllerAttached);
+            break;
+
+        case frame::FrameAction_COMPONENT_ATTACHED:
+            ConnectToController();
+            CallListeners (EventMultiplexerEventId::ControllerAttached);
+            break;
+
+        default:
+            break;
+    }
+}
+
+//===== view::XSelectionChangeListener ========================================
+
+void SAL_CALL EventMultiplexer::Implementation::selectionChanged (
+    const lang::EventObject& )
+{
+    CallListeners (EventMultiplexerEventId::EditViewSelection);
+}
+
+//===== drawing::framework::XConfigurationChangeListener ==================
+
+void SAL_CALL EventMultiplexer::Implementation::notifyConfigurationChange (
+    const ConfigurationChangeEvent& rEvent)
+{
+    sal_Int32 nEventType = 0;
+    rEvent.UserData >>= nEventType;
+    switch (nEventType)
+    {
+        case ResourceActivationEvent:
+            if (rEvent.ResourceId->getResourceURL().match(FrameworkHelper::msViewURLPrefix))
+            {
+                CallListeners (EventMultiplexerEventId::ViewAdded);
+
+                if (rEvent.ResourceId->isBoundToURL(
+                    FrameworkHelper::msCenterPaneURL, AnchorBindingMode_DIRECT))
+                {
+                    CallListeners (EventMultiplexerEventId::MainViewAdded);
+                }
+
+                // Add selection change listener at slide sorter.
+                if (rEvent.ResourceId->getResourceURL() == FrameworkHelper::msSlideSorterURL)
+                {
+                    slidesorter::SlideSorterViewShell* pViewShell
+                        = dynamic_cast<slidesorter::SlideSorterViewShell*>(
+                            FrameworkHelper::GetViewShell(
+                                Reference<XView>(rEvent.ResourceObject,UNO_QUERY)).get());
+                    if (pViewShell != nullptr)
+                        pViewShell->AddSelectionChangeListener (
+                            LINK(this,
+                                EventMultiplexer::Implementation,
+                                SlideSorterSelectionChangeListener));
+                }
+            }
+            break;
+
+        case ResourceDeactivationEvent:
+            if (rEvent.ResourceId->getResourceURL().match(FrameworkHelper::msViewURLPrefix))
+            {
+                if (rEvent.ResourceId->isBoundToURL(
+                    FrameworkHelper::msCenterPaneURL, AnchorBindingMode_DIRECT))
+                {
+                    CallListeners (EventMultiplexerEventId::MainViewRemoved);
+                }
+
+                // Remove selection change listener from slide sorter.  Add
+                // selection change listener at slide sorter.
+                if (rEvent.ResourceId->getResourceURL() == FrameworkHelper::msSlideSorterURL)
+                {
+                    slidesorter::SlideSorterViewShell* pViewShell
+                        = dynamic_cast<slidesorter::SlideSorterViewShell*>(
+                            FrameworkHelper::GetViewShell(
+                                Reference<XView>(rEvent.ResourceObject, UNO_QUERY)).get());
+                    if (pViewShell != nullptr)
+                        pViewShell->RemoveSelectionChangeListener (
+                            LINK(this,
+                                EventMultiplexer::Implementation,
+                                SlideSorterSelectionChangeListener));
+                }
+            }
+            break;
+
+        case ConfigurationUpdateEvent:
+            CallListeners (EventMultiplexerEventId::ConfigurationUpdated);
+            break;
+    }
+
+}
+
+void EventMultiplexer::Implementation::disposing(std::unique_lock<std::mutex>& rGuard)
+{
+    ListenerList aCopyListeners( maListeners );
+
+    rGuard.unlock();
+
+    EventMultiplexerEvent rEvent(EventMultiplexerEventId::Disposing, nullptr);
+    for (const auto& rListener : aCopyListeners)
+        rListener.Call(rEvent);
+
+    rGuard.lock();
+
+    ReleaseListeners();
+}
+
+void EventMultiplexer::Implementation::Notify (
+    SfxBroadcaster&,
+    const SfxHint& rHint)
+{
+    if (rHint.GetId() == SfxHintId::ThisIsAnSdrHint)
+    {
+        const SdrHint* pSdrHint = static_cast<const SdrHint*>(&rHint);
+        switch (pSdrHint->GetKind())
+        {
+            case SdrHintKind::ModelCleared:
+            case SdrHintKind::PageOrderChange:
+                CallListeners (EventMultiplexerEventId::PageOrder);
+                break;
+
+            case SdrHintKind::SwitchToPage:
+                CallListeners (EventMultiplexerEventId::CurrentPageChanged);
+                break;
+
+            case SdrHintKind::ObjectChange:
+                CallListeners(EventMultiplexerEventId::ShapeChanged,
+                    static_cast<const void*>(pSdrHint->GetPage()));
+                break;
+
+            case SdrHintKind::ObjectInserted:
+                CallListeners(EventMultiplexerEventId::ShapeInserted,
+                    static_cast<const void*>(pSdrHint->GetPage()));
+                break;
+
+            case SdrHintKind::ObjectRemoved:
+                CallListeners(EventMultiplexerEventId::ShapeRemoved,
+                    static_cast<const void*>(pSdrHint->GetPage()));
+                break;
+            default:
+                break;
+        }
+    }
+    else
+    {
+        if (rHint.GetId() == SfxHintId::Dying)
+            mpDocument = nullptr;
+    }
+}
+
+void EventMultiplexer::Implementation::CallListeners (
+    EventMultiplexerEventId eId,
+    void const * pUserData)
+{
+    EventMultiplexerEvent aEvent(eId, pUserData);
+    CallListeners(aEvent);
+}
+
+void EventMultiplexer::Implementation::CallListeners (EventMultiplexerEvent& rEvent)
+{
+    ListenerList aCopyListeners( maListeners );
+    for (const auto& rListener : aCopyListeners)
+    {
+        rListener.Call(rEvent);
+    }
+}
+
+IMPL_LINK_NOARG(EventMultiplexer::Implementation, SlideSorterSelectionChangeListener, LinkParamNone*, void)
+{
+    CallListeners(EventMultiplexerEventId::SlideSortedSelection);
+}
+
+//===== EventMultiplexerEvent =================================================
+
+EventMultiplexerEvent::EventMultiplexerEvent (
+    EventMultiplexerEventId eEventId,
+    const void* pUserData)
+    : meEventId(eEventId),
+      mpUserData(pUserData)
+{
+}
+
+} // end of namespace ::sd::tools
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */