Alsing.Drawing.GDI.FontList.OnMouseDown C# (CSharp) Méthode

        private void OnMouseDown(object sender, MouseEventArgs e)
        {
            if (!handleLostfocus && FontListbox.ClientRectangle.Contains(FontListbox.PointToClient(new Point(e.X, e.Y))))
            {
                FontListbox.LostFocus += ValueChanged;
                handleLostfocus = true;
            }
        }