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diff --git a/sw/source/uibase/docvw/ShadowOverlayObject.hxx b/sw/source/uibase/docvw/ShadowOverlayObject.hxx
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+++ b/sw/source/uibase/docvw/ShadowOverlayObject.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 .
+ */
+
+#ifndef INCLUDED_SW_SOURCE_UIBASE_DOCVW_SHADOWOVERLAYOBJECT_HXX
+#define INCLUDED_SW_SOURCE_UIBASE_DOCVW_SHADOWOVERLAYOBJECT_HXX
+
+#include <svx/sdr/overlay/overlayobject.hxx>
+
+class SwView;
+
+namespace sw::sidebarwindows {
+
+enum ShadowState
+{
+    SS_NORMAL,
+    SS_VIEW,
+    SS_EDIT
+};
+
+class ShadowOverlayObject: public sdr::overlay::OverlayObjectWithBasePosition
+{
+protected:
+        // geometry creation for OverlayObject
+        virtual drawinglayer::primitive2d::Primitive2DContainer createOverlayObjectPrimitive2DSequence() override;
+
+private:
+        basegfx::B2DPoint maSecondPosition;
+        ShadowState mShadowState;
+
+        ShadowOverlayObject( const basegfx::B2DPoint& rBasePos,
+                             const basegfx::B2DPoint& rSecondPosition,
+                             Color aBaseColor );
+
+public:
+        virtual ~ShadowOverlayObject() override;
+
+        void SetShadowState(ShadowState aState);
+        ShadowState GetShadowState() const {return mShadowState;}
+
+        void SetPosition( const basegfx::B2DPoint& rPoint1,
+                          const basegfx::B2DPoint& rPoint2 );
+
+        static std::unique_ptr<ShadowOverlayObject> CreateShadowOverlayObject( SwView const & rDocView );
+};
+
+} // end of namespace sw::sidebarwindows
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */