UnityEditor.SplitView.RootViewDropZone C# (CSharp) Method

        private DropInfo RootViewDropZone(ViewEdge edge, Vector2 mousePos, Rect screenRect)
        {
            float offset = ((edge & ViewEdge.FitsVertical) == ViewEdge.None) ? 50f : 70f;
            if (!this.RectFromEdge(screenRect, edge, 70f, offset).Contains(mousePos))
            {
                return null;
            }
            return new DropInfo(this) { 
                type = DropInfo.Type.Pane,
                userData = new ExtraDropInfo(true, edge, 0),
                rect = this.RectFromEdge(screenRect, edge, 200f, 0f)
            };
        }