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diff --git a/sd/source/ui/slidesorter/controller/SlsSelectionManager.cxx b/sd/source/ui/slidesorter/controller/SlsSelectionManager.cxx
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+++ b/sd/source/ui/slidesorter/controller/SlsSelectionManager.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 <controller/SlsSelectionManager.hxx>
+
+#include <SlideSorter.hxx>
+#include <controller/SlideSorterController.hxx>
+#include <controller/SlsCurrentSlideManager.hxx>
+#include <controller/SlsFocusManager.hxx>
+#include <controller/SlsPageSelector.hxx>
+#include <controller/SlsSelectionObserver.hxx>
+#include <model/SlideSorterModel.hxx>
+#include <model/SlsPageEnumerationProvider.hxx>
+#include <model/SlsPageDescriptor.hxx>
+#include <view/SlideSorterView.hxx>
+#include <comphelper/diagnose_ex.hxx>
+#include <drawdoc.hxx>
+#include <sdpage.hxx>
+#include <drawview.hxx>
+#include <DrawViewShell.hxx>
+#include <ViewShellBase.hxx>
+#include <svx/svxids.hrc>
+#include <com/sun/star/drawing/XMasterPagesSupplier.hpp>
+#include <com/sun/star/drawing/XDrawPagesSupplier.hpp>
+
+
+#include <sdresid.hxx>
+#include <strings.hrc>
+#include <app.hrc>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::drawing;
+using namespace ::com::sun::star::uno;
+using namespace ::sd::slidesorter::model;
+using namespace ::sd::slidesorter::view;
+using namespace ::sd::slidesorter::controller;
+
+namespace sd::slidesorter::controller {
+
+SelectionManager::SelectionManager (SlideSorter& rSlideSorter)
+    : mrSlideSorter(rSlideSorter),
+      mrController(rSlideSorter.GetController()),
+      mnInsertionPosition(-1),
+      mpSelectionObserver(std::make_shared<SelectionObserver>(rSlideSorter))
+{
+}
+
+SelectionManager::~SelectionManager()
+{
+}
+
+void SelectionManager::DeleteSelectedPages (const bool bSelectFollowingPage)
+{
+    // Create some locks to prevent updates of the model, view, selection
+    // state while modifying any of them.
+    SlideSorterController::ModelChangeLock aLock (mrController);
+    SlideSorterView::DrawLock aDrawLock (mrSlideSorter);
+    PageSelector::UpdateLock aSelectionLock (mrSlideSorter);
+
+    // Hide focus.
+    bool bIsFocusShowing = mrController.GetFocusManager().IsFocusShowing();
+    if (bIsFocusShowing)
+        mrController.GetFocusManager().ToggleFocus();
+
+    // Store pointers to all selected page descriptors.  This is necessary
+    // because the pages get deselected when the first one is deleted.
+    model::PageEnumeration aPageEnumeration (
+        PageEnumerationProvider::CreateSelectedPagesEnumeration(mrSlideSorter.GetModel()));
+    ::std::vector<SdPage*> aSelectedPages;
+    sal_Int32 nNewCurrentSlide (-1);
+    while (aPageEnumeration.HasMoreElements())
+    {
+        SharedPageDescriptor pDescriptor (aPageEnumeration.GetNextElement());
+        aSelectedPages.push_back(pDescriptor->GetPage());
+        if (bSelectFollowingPage || nNewCurrentSlide<0)
+            nNewCurrentSlide = pDescriptor->GetPageIndex();
+    }
+    if (aSelectedPages.empty())
+        return;
+
+    // Determine the slide to select (and thereby make the current slide)
+    // after the deletion.
+    if (bSelectFollowingPage)
+        nNewCurrentSlide -= aSelectedPages.size() - 1;
+    else
+        --nNewCurrentSlide;
+
+    const auto pViewShell = mrSlideSorter.GetViewShell();
+    const auto pDrawViewShell = pViewShell ? std::dynamic_pointer_cast<sd::DrawViewShell>(pViewShell->GetViewShellBase().GetMainViewShell()) : nullptr;
+    const auto pDrawView = pDrawViewShell ? pDrawViewShell->GetDrawView() : nullptr;
+
+    if (pDrawView)
+        pDrawView->BlockPageOrderChangedHint(true);
+
+    // Proper naming for the undo action
+    OUString sUndoComment(SdResId(STR_UNDO_DELETEPAGES));
+    if (mrSlideSorter.GetView().GetDoc().GetDocumentType() == DocumentType::Draw)
+        sUndoComment = SdResId(STR_UNDO_DELETEPAGES_DRAW);
+
+    // The actual deletion of the selected pages is done in one of two
+    // helper functions.  They are specialized for normal respectively for
+    // master pages.
+    mrSlideSorter.GetView().BegUndo (sUndoComment);
+    if (mrSlideSorter.GetModel().GetEditMode() == EditMode::Page)
+        DeleteSelectedNormalPages(aSelectedPages);
+    else
+        DeleteSelectedMasterPages(aSelectedPages);
+    mrSlideSorter.GetView().EndUndo ();
+
+    mrController.HandleModelChange();
+    aLock.Release();
+    if (pDrawView)
+    {
+        assert(pDrawViewShell);
+        pDrawView->BlockPageOrderChangedHint(false);
+        pDrawViewShell->ResetActualPage();
+    }
+
+    // Show focus and move it to next valid location.
+    if (bIsFocusShowing)
+        mrController.GetFocusManager().ToggleFocus();
+
+    // Set the new current slide.
+    if (nNewCurrentSlide < 0)
+        nNewCurrentSlide = 0;
+    else if (nNewCurrentSlide >= mrSlideSorter.GetModel().GetPageCount())
+        nNewCurrentSlide = mrSlideSorter.GetModel().GetPageCount()-1;
+    mrController.GetPageSelector().CountSelectedPages();
+    mrController.GetPageSelector().SelectPage(nNewCurrentSlide);
+    mrController.GetFocusManager().SetFocusedPage(nNewCurrentSlide);
+}
+
+void SelectionManager::DeleteSelectedNormalPages (const ::std::vector<SdPage*>& rSelectedPages)
+{
+    // Prepare the deletion via the UNO API.
+    OSL_ASSERT(mrSlideSorter.GetModel().GetEditMode() == EditMode::Page);
+
+    try
+    {
+        Reference<drawing::XDrawPagesSupplier> xDrawPagesSupplier( mrSlideSorter.GetModel().GetDocument()->getUnoModel(), UNO_QUERY_THROW );
+        Reference<drawing::XDrawPages> xPages( xDrawPagesSupplier->getDrawPages(), UNO_SET_THROW );
+
+        // Iterate over all pages that were selected when this method was called
+        // and delete the draw page the notes page. The iteration is done in
+        // reverse order so that when one slide is not deleted (to avoid an
+        // empty document) the remaining slide is the first one.
+        ::std::vector<SdPage*>::const_reverse_iterator aI;
+        for (aI=rSelectedPages.rbegin(); aI!=rSelectedPages.rend(); ++aI)
+        {
+            // Do not delete the last slide in the document.
+            if (xPages->getCount() <= 1)
+                break;
+
+            const sal_uInt16 nPage (model::FromCoreIndex((*aI)->GetPageNum()));
+
+            Reference< XDrawPage > xPage( xPages->getByIndex( nPage ), UNO_QUERY_THROW );
+            xPages->remove(xPage);
+        }
+    }
+    catch( Exception& )
+    {
+        TOOLS_WARN_EXCEPTION( "sd", "SelectionManager::DeleteSelectedNormalPages()");
+    }
+}
+
+void SelectionManager::DeleteSelectedMasterPages (const ::std::vector<SdPage*>& rSelectedPages)
+{
+    // Prepare the deletion via the UNO API.
+    OSL_ASSERT(mrSlideSorter.GetModel().GetEditMode() == EditMode::MasterPage);
+
+    try
+    {
+        Reference<drawing::XMasterPagesSupplier> xDrawPagesSupplier( mrSlideSorter.GetModel().GetDocument()->getUnoModel(), UNO_QUERY_THROW );
+        Reference<drawing::XDrawPages> xPages( xDrawPagesSupplier->getMasterPages(), UNO_SET_THROW );
+
+        // Iterate over all pages that were selected when this method was called
+        // and delete the draw page the notes page. The iteration is done in
+        // reverse order so that when one slide is not deleted (to avoid an
+        // empty document) the remaining slide is the first one.
+        ::std::vector<SdPage*>::const_reverse_iterator aI;
+        for (aI=rSelectedPages.rbegin(); aI!=rSelectedPages.rend(); ++aI)
+        {
+            // Do not delete the last slide in the document.
+            if (xPages->getCount() <= 1)
+                break;
+
+            const sal_uInt16 nPage (model::FromCoreIndex((*aI)->GetPageNum()));
+
+            Reference< XDrawPage > xPage( xPages->getByIndex( nPage ), UNO_QUERY_THROW );
+            xPages->remove(xPage);
+        }
+    }
+    catch( Exception& )
+    {
+        TOOLS_WARN_EXCEPTION( "sd", "SelectionManager::DeleteSelectedMasterPages()");
+    }
+}
+
+void SelectionManager::SelectionHasChanged ()
+{
+    ViewShell* pViewShell = mrSlideSorter.GetViewShell();
+    if (pViewShell == nullptr)
+        return;
+
+    pViewShell->Invalidate (SID_EXPAND_PAGE);
+    pViewShell->Invalidate (SID_SUMMARY_PAGE);
+    pViewShell->Invalidate(SID_SHOW_SLIDE);
+    pViewShell->Invalidate(SID_HIDE_SLIDE);
+    pViewShell->Invalidate(SID_DELETE_PAGE);
+    pViewShell->Invalidate(SID_DELETE_MASTER_PAGE);
+    pViewShell->Invalidate(SID_ASSIGN_LAYOUT);
+
+    // StatusBar
+    pViewShell->Invalidate (SID_STATUS_PAGE);
+    pViewShell->Invalidate (SID_STATUS_LAYOUT);
+    pViewShell->Invalidate (SID_SCALE);
+
+    OSL_ASSERT(mrController.GetCurrentSlideManager());
+    SharedPageDescriptor pDescriptor(mrController.GetCurrentSlideManager()->GetCurrentSlide());
+    if (pDescriptor)
+        pViewShell->UpdatePreview(pDescriptor->GetPage());
+
+    // Tell the selection change listeners that the selection has changed.
+    for (const auto& rLink : maSelectionChangeListeners)
+    {
+        rLink.Call(nullptr);
+    }
+
+    // Reset the insertion position: until set again it is calculated from
+    // the current selection.
+    mnInsertionPosition = -1;
+}
+
+void SelectionManager::AddSelectionChangeListener (const Link<LinkParamNone*,void>& rListener)
+{
+    if (::std::find (
+        maSelectionChangeListeners.begin(),
+        maSelectionChangeListeners.end(),
+        rListener) == maSelectionChangeListeners.end())
+    {
+        maSelectionChangeListeners.push_back (rListener);
+    }
+}
+
+void SelectionManager::RemoveSelectionChangeListener(const Link<LinkParamNone*,void>& rListener)
+{
+    maSelectionChangeListeners.erase (
+        ::std::find (
+            maSelectionChangeListeners.begin(),
+            maSelectionChangeListeners.end(),
+            rListener));
+}
+
+sal_Int32 SelectionManager::GetInsertionPosition() const
+{
+    sal_Int32 nInsertionPosition (mnInsertionPosition);
+    if (nInsertionPosition < 0)
+    {
+        model::PageEnumeration aSelectedPages
+            (model::PageEnumerationProvider::CreateSelectedPagesEnumeration(
+                mrSlideSorter.GetModel()));
+        // Initialize (for the case of an empty selection) with the position
+        // at the end of the document.
+        nInsertionPosition = mrSlideSorter.GetModel().GetPageCount();
+        while (aSelectedPages.HasMoreElements())
+        {
+            const sal_Int32 nPosition (aSelectedPages.GetNextElement()->GetPage()->GetPageNum());
+            // Convert *2+1 index to straight index (n-1)/2 after the page
+            // (+1).
+            nInsertionPosition = model::FromCoreIndex(nPosition) + 1;
+        }
+
+    }
+    return nInsertionPosition;
+}
+
+void SelectionManager::SetInsertionPosition (const sal_Int32 nInsertionPosition)
+{
+    if (nInsertionPosition < 0)
+        mnInsertionPosition = -1;
+    else if (nInsertionPosition > mrSlideSorter.GetModel().GetPageCount())
+    {
+        // Assert but then ignore invalid values.
+        OSL_ASSERT(nInsertionPosition<=mrSlideSorter.GetModel().GetPageCount());
+        return;
+    }
+    else
+        mnInsertionPosition = nInsertionPosition;
+}
+
+} // end of namespace ::sd::slidesorter::controller
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */