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diff --git a/sd/source/ui/slidesorter/inc/view/SlsPageObjectLayouter.hxx b/sd/source/ui/slidesorter/inc/view/SlsPageObjectLayouter.hxx
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+++ b/sd/source/ui/slidesorter/inc/view/SlsPageObjectLayouter.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 .
+ */
+
+#pragma once
+
+#include <model/SlsSharedPageDescriptor.hxx>
+#include <tools/gen.hxx>
+#include <vcl/image.hxx>
+
+namespace vcl { class Font; }
+namespace sd { class Window; }
+
+namespace sd::slidesorter::view {
+
+/** In contrast to the Layouter that places page objects in the view, the
+    PageObjectLayouter places the parts of individual page objects like page
+    number area, borders, preview.
+*/
+class PageObjectLayouter
+{
+public:
+    /** Create a new PageObjectLayouter object.
+        @param rPageObjectSize
+            In general either the width or the height will be 0 in order to
+            signal that this size component has to be calculated from the other.
+            This calculation will make the preview as large as possible.
+        @param nPageCount
+            The page count is used to determine how wide the page number
+            area has to be, how many digits to except for the largest page number.
+    */
+    PageObjectLayouter(
+        const Size& rPageObjectWindowSize,
+        const Size& rPreviewModelSize,
+        sd::Window *pWindow,
+        const sal_Int32 nPageCount);
+    ~PageObjectLayouter();
+
+    enum class Part {
+        // The focus indicator is painted outside the actual page object.
+        FocusIndicator,
+        // This is the outer bounding box that includes the preview, page
+        // number, title.
+        PageObject,
+        // Bounding box of the actual preview.
+        Preview,
+        // Bounding box of the page number.
+        PageNumber,
+        // Indicator whether or not there is a slide transition associated
+        // with this slide.
+        TransitionEffectIndicator,
+        // Indicator whether or not there is a custom animation associated
+        // with this slide.
+        CustomAnimationEffectIndicator
+    };
+    /** Two coordinate systems are supported.  They differ only in
+        translation not in scale.  Both relate to pixel values in the window.
+        A position in the model coordinate system does not change when the window content is
+        scrolled up or down.  In the window coordinate system (relative
+        to the top left point of the window)scrolling leads to different values.
+    */
+    enum CoordinateSystem {
+        WindowCoordinateSystem,
+        ModelCoordinateSystem
+    };
+
+    /** Return the bounding box of the page object or one of its graphical
+        parts.
+        @param rWindow
+            This device is used to translate between model and window
+            coordinates.
+        @param rpPageDescriptor
+            The page for which to calculate the bounding box.  This may be
+            NULL.  When it is NULL then a generic bounding box is calculated
+            for the location (0,0).
+        @param ePart
+            The part of the page object for which to return the bounding
+            box.
+        @param eCoordinateSystem
+            The bounding box can be returned in model and in pixel
+            (window) coordinates.
+        @param bIgnoreLocation
+            Return a position ignoring the slides' location, ie. as if
+            we were the first slide.
+    */
+    ::tools::Rectangle GetBoundingBox (
+        const model::SharedPageDescriptor& rpPageDescriptor,
+        const Part ePart,
+        const CoordinateSystem eCoordinateSystem,
+        bool bIgnoreLocation = false);
+
+    /// the size of the embedded preview: position independent, in window coordinate system
+    Size GetPreviewSize();
+
+    /// the maximum size of each tile, also position independent, in window coordinate system
+    Size GetGridMaxSize();
+
+    const Image& GetTransitionEffectIcon() const { return maTransitionEffectIcon;}
+    const Image& GetCustomAnimationEffectIcon() const { return maCustomAnimationEffectIcon;}
+
+private:
+    ::tools::Rectangle GetBoundingBox (
+        const Point& rPageObjectLocation,
+        const Part ePart,
+        const CoordinateSystem eCoordinateSystem);
+
+private:
+    VclPtr<sd::Window> mpWindow;
+    ::tools::Rectangle maFocusIndicatorBoundingBox;
+    ::tools::Rectangle maPageObjectBoundingBox;
+    ::tools::Rectangle maPageNumberAreaBoundingBox;
+    ::tools::Rectangle maPreviewBoundingBox;
+    ::tools::Rectangle maTransitionEffectBoundingBox;
+    ::tools::Rectangle maCustomAnimationEffectBoundingBox;
+    const Image maTransitionEffectIcon;
+    const Image maCustomAnimationEffectIcon;
+    const std::shared_ptr<vcl::Font> mpPageNumberFont;
+
+    Size GetPageNumberAreaSize (const int nPageCount);
+    ::tools::Rectangle CalculatePreviewBoundingBox (
+        Size& rPageObjectSize,
+        const Size& rPreviewModelSize,
+        const sal_Int32 nPageNumberAreaWidth,
+        const sal_Int32 nFocusIndicatorWidth);
+};
+
+} // end of namespace ::sd::slidesorter::view
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */