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diff --git a/basctl/source/inc/layout.hxx b/basctl/source/inc/layout.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 "bastypes.hxx"
+#include <vcl/split.hxx>
+#include <vcl/vclptr.hxx>
+
+#include <vector>
+
+class DockingWindow;
+class SfxRequest;
+class SfxItemSet;
+
+namespace basctl
+{
+class DockingWindow;
+class BaseWindow;
+
+// Layout -- the common base of ModulLayout and DialogLayout.
+// Handles the splitting lines and the dockable windows.
+
+class Layout : public vcl::Window
+{
+public:
+    void ArrangeWindows();
+
+    virtual void Activating(BaseWindow&);
+    virtual void Deactivating();
+    virtual void ExecuteGlobal(SfxRequest&) {}
+    virtual void GetState(SfxItemSet&, unsigned nWhich) = 0;
+    virtual void UpdateDebug(bool bBasicStopped) = 0;
+
+    virtual ~Layout() override;
+    virtual void dispose() override;
+
+protected:
+    explicit Layout(vcl::Window* pParent);
+
+    void AddToLeft(DockingWindow* pWin, Size const& rSize) { aLeftSide.Add(pWin, rSize); }
+    void AddToBottom(DockingWindow* pWin, Size const& rSize) { aBottomSide.Add(pWin, rSize); }
+    void Remove(DockingWindow*);
+    bool HasSize() const { return !bFirstSize; }
+
+    // Window:
+    virtual void Resize() override;
+    virtual void DataChanged(DataChangedEvent const& rDCEvt) override;
+    // new:
+    virtual void OnFirstSize(tools::Long nWidth, tools::Long nHeight) = 0;
+
+private:
+    // the main child window (either ModulWindow or DialogWindow)
+    VclPtr<BaseWindow> pChild;
+
+    // when this window has at first (nonempty) size
+    bool bFirstSize;
+
+    // horizontal or vertical split strip
+    class SplittedSide
+    {
+    public:
+        enum class Side
+        {
+            Left,
+            Bottom
+        };
+        SplittedSide(Layout*, Side);
+        void Add(DockingWindow*, Size const&);
+        void Remove(DockingWindow*);
+        bool IsEmpty() const;
+        tools::Long GetSize() const;
+        void ArrangeIn(tools::Rectangle const&);
+        void dispose();
+
+    private:
+        // the layout window
+        Layout& rLayout;
+        // horizontal or vertical strip?
+        bool bVertical;
+        // lower (top or left) or higher (bottom or right) strip?
+        bool bLower;
+        // rectangle to move in
+        tools::Rectangle aRect;
+        // size (width or height)
+        tools::Long nSize;
+        // the main splitting line
+        VclPtr<Splitter> aSplitter;
+        // the dockable windows (and some data)
+        struct Item
+        {
+            // pointer to the dockable window
+            VclPtr<DockingWindow> pWin;
+            // starting and ending position in the strip
+            // They may be different from the actual window position, because
+            // the window may fill the space of the adjacent currently
+            // non-docking windows, but this change is not stored in these
+            // variables. These change only when the splitter lines are moved.
+            tools::Long nStartPos, nEndPos;
+            // splitter line window before the window
+            // (the first one is always nullptr)
+            VclPtr<Splitter> pSplit;
+        };
+        std::vector<Item> vItems;
+
+        Point MakePoint(tools::Long, tools::Long) const;
+        Size MakeSize(tools::Long, tools::Long) const;
+        static bool IsDocking(DockingWindow const&);
+        DECL_LINK(SplitHdl, Splitter*, void);
+        void CheckMarginsFor(Splitter*);
+        void InitSplitter(Splitter&);
+    } aLeftSide, aBottomSide;
+};
+
+} // namespace basctl
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */