UnityEditor.DockArea.EndOffsetArea C# (CSharp) Method

        public static void EndOffsetArea()
        {
            if (Event.current.type != EventType.Used)
            {
                GUILayoutUtility.EndLayoutGroup();
                GUI.EndGroup();
            }
        }

        public void OnGUI()
        {
            base.ClearBackground();
            EditorGUIUtility.ResetGUIState();
            Rect rect = new Rect(-2f, 0f, base.position.width + 4f, base.position.height);

            this.background = "dockarea";
            GUIStyle style = "dockareaoverlay";

            rect = this.background.margin.Remove(rect);
            base.DoWindowDecorationStart();
            Rect position = new Rect(rect.x + 1f, rect.y, rect.width - 2f, 17f);

            if (Event.current.type == EventType.Repaint)
            {
                this.background.Draw(rect, GUIContent.none, false, false, false, false);
                GUIStyle gUIStyle = "dragTab";
                gUIStyle.Draw(position, base.actualView.titleContent, false, false, true, base.hasFocus);
            }
            if (Event.current.type == EventType.ContextClick && position.Contains(Event.current.mousePosition))
            {
                base.PopupGenericMenu(base.actualView, new Rect(Event.current.mousePosition.x, Event.current.mousePosition.y, 0f, 0f));
            }
            base.ShowGenericMenu();
            if (base.actualView)
            {
                base.actualView.m_Pos = base.borderSize.Remove(base.screenPosition);
                if (base.actualView is GameView)
                {
                    GUI.Box(rect, GUIContent.none, style);
                }
            }
            DockArea.BeginOffsetArea(new Rect(rect.x + 2f, rect.y + 17f, rect.width - 4f, rect.height - 17f - 2f), GUIContent.none, "TabWindowBackground");
            try
            {
                base.Invoke("OnGUI");
            }
            catch (TargetInvocationException ex)
            {
                throw ex.InnerException;
            }
            EditorGUIUtility.ResetGUIState();
            DockArea.EndOffsetArea();
            base.DoWindowDecorationEnd();
            GUI.Box(rect, GUIContent.none, style);
        }