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diff --git a/sd/source/ui/sidebar/MasterPageDescriptor.cxx b/sd/source/ui/sidebar/MasterPageDescriptor.cxx
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+++ b/sd/source/ui/sidebar/MasterPageDescriptor.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 <memory>
+#include "MasterPageDescriptor.hxx"
+#include "MasterPageContainerProviders.hxx"
+
+#include "DocumentHelper.hxx"
+#include <PreviewRenderer.hxx>
+#include <sdpage.hxx>
+#include <tools/urlobj.hxx>
+#include <sal/log.hxx>
+
+namespace sd::sidebar {
+
+//===== MasterPageDescriptor ==================================================
+
+MasterPageDescriptor::MasterPageDescriptor (
+    MasterPageContainer::Origin eOrigin,
+    const sal_Int32 nTemplateIndex,
+    const OUString& rsURL,
+    const OUString& rsPageName,
+    const OUString& rsStyleName,
+    const bool bIsPrecious,
+    const std::shared_ptr<PageObjectProvider>& rpPageObjectProvider,
+    const std::shared_ptr<PreviewProvider>& rpPreviewProvider)
+    : maToken(MasterPageContainer::NIL_TOKEN),
+      meOrigin(eOrigin),
+      msURL(INetURLObject(rsURL).GetMainURL(INetURLObject::DecodeMechanism::Unambiguous)),
+      msPageName(rsPageName),
+      msStyleName(rsStyleName),
+      mbIsPrecious(bIsPrecious),
+      mpMasterPage(nullptr),
+      mpSlide(nullptr),
+      maSmallPreview(),
+      maLargePreview(),
+      mpPreviewProvider(rpPreviewProvider),
+      mpPageObjectProvider(rpPageObjectProvider),
+      mnTemplateIndex(nTemplateIndex),
+      meURLClassification(URLCLASS_UNDETERMINED),
+      mnUseCount(0)
+{
+}
+
+void MasterPageDescriptor::SetToken (MasterPageContainer::Token aToken)
+{
+    maToken = aToken;
+}
+
+const Image& MasterPageDescriptor::GetPreview (MasterPageContainer::PreviewSize eSize) const
+{
+    if (eSize == MasterPageContainer::SMALL)
+        return maSmallPreview;
+    else
+        return maLargePreview;
+}
+
+::std::unique_ptr<std::vector<MasterPageContainerChangeEvent::EventType> >
+    MasterPageDescriptor::Update (
+        const MasterPageDescriptor& rDescriptor)
+{
+    bool bDataChanged (false);
+    bool bIndexChanged (false);
+    bool bPreviewChanged (false);
+
+    if (meOrigin==MasterPageContainer::UNKNOWN
+        && rDescriptor.meOrigin!=MasterPageContainer::UNKNOWN)
+    {
+        meOrigin = rDescriptor.meOrigin;
+        bIndexChanged = true;
+    }
+
+    if (msURL.isEmpty() && !rDescriptor.msURL.isEmpty())
+    {
+        msURL = rDescriptor.msURL;
+        bDataChanged = true;
+    }
+
+    if (msPageName.isEmpty() && !rDescriptor.msPageName.isEmpty())
+    {
+        msPageName = rDescriptor.msPageName;
+        bDataChanged = true;
+    }
+
+    if (msStyleName.isEmpty() && !rDescriptor.msStyleName.isEmpty())
+    {
+        msStyleName = rDescriptor.msStyleName;
+        bDataChanged = true;
+    }
+
+    if (mpPageObjectProvider == nullptr && rDescriptor.mpPageObjectProvider != nullptr)
+    {
+        mpPageObjectProvider = rDescriptor.mpPageObjectProvider;
+        bDataChanged = true;
+    }
+
+    if (mpPreviewProvider == nullptr && rDescriptor.mpPreviewProvider != nullptr)
+    {
+        mpPreviewProvider = rDescriptor.mpPreviewProvider;
+        bPreviewChanged = true;
+    }
+
+    if (mnTemplateIndex<0 && rDescriptor.mnTemplateIndex>=0)
+    {
+         mnTemplateIndex = rDescriptor.mnTemplateIndex;
+         bIndexChanged = true;
+    }
+
+     // Prepare the list of event types that will be returned.
+    ::std::unique_ptr<std::vector<MasterPageContainerChangeEvent::EventType> > pResult;
+    if (bDataChanged || bIndexChanged || bPreviewChanged)
+    {
+         pResult.reset(new std::vector<MasterPageContainerChangeEvent::EventType>);
+         if (bDataChanged)
+             pResult->push_back(MasterPageContainerChangeEvent::EventType::DATA_CHANGED);
+         if (bIndexChanged)
+             pResult->push_back(MasterPageContainerChangeEvent::EventType::INDEX_CHANGED);
+         if (bPreviewChanged)
+             pResult->push_back(MasterPageContainerChangeEvent::EventType::PREVIEW_CHANGED);
+    }
+
+    return pResult;
+}
+
+int MasterPageDescriptor::UpdatePageObject (
+    sal_Int32 nCostThreshold,
+    SdDrawDocument* pDocument)
+{
+    int nModified = 0;
+
+    // Update the page object when that is not yet known.
+    if (mpMasterPage == nullptr && mpPageObjectProvider != nullptr
+        && (nCostThreshold < 0 || mpPageObjectProvider->GetCostIndex() <= nCostThreshold))
+    {
+        // Note that pDocument may be NULL.
+
+        SdPage* pPage = (*mpPageObjectProvider)(pDocument);
+        if (meOrigin == MasterPageContainer::MASTERPAGE)
+        {
+            mpMasterPage = pPage;
+            if (mpMasterPage != nullptr)
+                mpMasterPage->SetPrecious(mbIsPrecious);
+        }
+        else
+        {
+            // Master pages from templates are copied into the local document.
+            if (pDocument != nullptr)
+                mpMasterPage = DocumentHelper::CopyMasterPageToLocalDocument(*pDocument,pPage);
+            mpSlide = DocumentHelper::GetSlideForMasterPage(mpMasterPage);
+        }
+
+        if (mpMasterPage != nullptr)
+        {
+            // Update page name and style name.
+            if (msPageName.isEmpty())
+                msPageName = mpMasterPage->GetName();
+            msStyleName = mpMasterPage->GetName();
+
+            // Delete an existing substitution. The next request for a preview
+            // will create the real one.
+            maSmallPreview = Image();
+            maLargePreview = Image();
+            mpPreviewProvider = std::make_shared<PagePreviewProvider>();
+        }
+        else
+        {
+            SAL_WARN( "sd", "UpdatePageObject: master page is NULL");
+            return -1;
+        }
+
+        nModified = 1;
+    }
+
+    return nModified;
+}
+
+bool MasterPageDescriptor::UpdatePreview (
+    sal_Int32 nCostThreshold,
+    const Size& rSmallSize,
+    const Size& rLargeSize,
+    ::sd::PreviewRenderer& rRenderer)
+{
+    bool bModified (false);
+
+    // Update the preview when that is not yet known.
+    if (maLargePreview.GetSizePixel().Width() == 0 && mpPreviewProvider != nullptr
+        && (nCostThreshold < 0 || mpPreviewProvider->GetCostIndex() <= nCostThreshold))
+    {
+        SdPage* pPage = mpSlide;
+        if (pPage == nullptr)
+        {
+            pPage = mpMasterPage;
+        }
+        //TODO: Notify LOOL of preview updates.
+        maLargePreview = (*mpPreviewProvider)(
+            rLargeSize.Width(),
+            pPage,
+            rRenderer);
+        if (maLargePreview.GetSizePixel().Width() > 0)
+        {
+            // Create the small preview by scaling the large one down.
+            maSmallPreview = rRenderer.ScaleBitmap(
+                maLargePreview.GetBitmapEx(),
+                rSmallSize.Width());
+            // The large preview may not have the desired width.  Scale it
+            // accordingly.
+            if (maLargePreview.GetSizePixel().Width() != rLargeSize.Width())
+                maLargePreview = rRenderer.ScaleBitmap(
+                    maLargePreview.GetBitmapEx(),
+                    rLargeSize.Width());
+            bModified = true;
+        }
+    }
+
+    return bModified;
+}
+
+MasterPageDescriptor::URLClassification MasterPageDescriptor::GetURLClassification()
+{
+    if (meURLClassification == URLCLASS_UNDETERMINED)
+    {
+        if (msURL.isEmpty())
+            meURLClassification = URLCLASS_UNKNOWN;
+        else if (msURL.indexOf("presnt")>=0)
+        {
+            meURLClassification = URLCLASS_PRESENTATION;
+        }
+        else if (msURL.indexOf("layout")>=0)
+        {
+            meURLClassification = URLCLASS_LAYOUT;
+        }
+        else if (msURL.indexOf("educate")>=0)
+        {
+            meURLClassification = URLCLASS_OTHER;
+        }
+        else
+        {
+            meURLClassification = URLCLASS_USER;
+        }
+    }
+
+    return meURLClassification;
+}
+
+//===== URLComparator =========================================================
+
+MasterPageDescriptor::URLComparator::URLComparator (const OUString& sURL)
+    : msURL(sURL)
+{
+}
+
+bool MasterPageDescriptor::URLComparator::operator() (
+    const SharedMasterPageDescriptor& rDescriptor)
+{
+    if (rDescriptor.get() == nullptr)
+        return false;
+    else
+        return rDescriptor->msURL == msURL;
+}
+
+// ===== StyleNameComparator ==================================================
+
+MasterPageDescriptor::StyleNameComparator::StyleNameComparator (const OUString& sStyleName)
+    : msStyleName(sStyleName)
+{
+}
+
+bool MasterPageDescriptor::StyleNameComparator::operator() (
+    const SharedMasterPageDescriptor& rDescriptor)
+{
+    if (rDescriptor.get() == nullptr)
+        return false;
+    else
+        return rDescriptor->msStyleName == msStyleName;
+}
+
+//===== PageObjectComparator ==================================================
+
+MasterPageDescriptor::PageObjectComparator::PageObjectComparator (const SdPage* pPageObject)
+    : mpMasterPage(pPageObject)
+{
+}
+
+bool MasterPageDescriptor::PageObjectComparator::operator() (
+    const SharedMasterPageDescriptor& rDescriptor)
+{
+    if (rDescriptor.get() == nullptr)
+        return false;
+    else
+        return rDescriptor->mpMasterPage==mpMasterPage;
+}
+
+//===== AllComparator =========================================================
+
+MasterPageDescriptor::AllComparator::AllComparator(const SharedMasterPageDescriptor& rDescriptor)
+    : mpDescriptor(rDescriptor)
+{
+}
+
+bool MasterPageDescriptor::AllComparator::operator() (const SharedMasterPageDescriptor&rDescriptor)
+{
+    if (rDescriptor.get() == nullptr)
+        return false;
+    else
+    {
+        // Take URL, page name, style name, and page object into account
+        // when comparing two descriptors.  When two descriptors are
+        // identical in any of these values then there are thought of as
+        // equivalent.  Only the Origin has to be the same in both
+        // descriptors.
+        return mpDescriptor->meOrigin == rDescriptor->meOrigin
+               && ((!mpDescriptor->msURL.isEmpty() && mpDescriptor->msURL == rDescriptor->msURL)
+                   || (!mpDescriptor->msPageName.isEmpty()
+                       && mpDescriptor->msPageName == rDescriptor->msPageName)
+                   || (!mpDescriptor->msStyleName.isEmpty()
+                       && mpDescriptor->msStyleName == rDescriptor->msStyleName)
+                   || (mpDescriptor->mpMasterPage != nullptr
+                       && mpDescriptor->mpMasterPage == rDescriptor->mpMasterPage)
+                   || (mpDescriptor->mpPageObjectProvider != nullptr
+                       && rDescriptor->mpPageObjectProvider != nullptr
+                       && mpDescriptor->mpPageObjectProvider == rDescriptor->mpPageObjectProvider));
+    }
+}
+
+} // end of namespace sd::sidebar
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */