SourceGrid.GridVirtual.OnMouseMove C# (CSharp) Method

        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);

            Position mousePosition = PositionAtPoint(new Point(e.X, e.Y));
            Cells.ICellVirtual mouseCell = GetCell(mousePosition);

            //Call MouseMove on the cell that receive tha MouseDown event
            if (MouseDownPosition.IsEmpty() == false)
            {
                Cells.ICellVirtual mouseDownCell = GetCell(MouseDownPosition);
                if (mouseDownCell != null)
                    Controller.OnMouseMove(new CellContext(this, MouseDownPosition, mouseDownCell), e);
            }
            else //se non ho nessuna cella attualmente che ha ricevuto un mousedown, l'evento di MouseMove viene segnalato sulla cella correntemente sotto il Mouse
            {
                // se non c'è nessuna cella MouseDown cambio la cella corrente sotto il Mouse
                ChangeMouseCell(mousePosition);//in ogni caso cambio la cella corrente

                if (mousePosition.IsEmpty() == false && mouseCell != null)
                {
                    // I call MouseMove on the current cell only if there aren't any cells under the mouse
                    Controller.OnMouseMove(new CellContext(this, mousePosition, mouseCell), e);
                }
            }
        }