Alsing.Windows.Forms.SyntaxBox.EditViewControl.IntelliMouse_Scroll C# (CSharp) Method

        private void IntelliMouse_Scroll(object sender,
                                         IntelliMouse.ScrollEventArgs e)
        {
            if (e.DeltaY < 0 && vScroll.Value == 0)
            {
                View.YOffset = 0;
                Redraw();
                return;
            }

            if (e.DeltaY > 0 && vScroll.Value >= vScroll.Maximum -
                                                 View.VisibleRowCount + 1)
            {
                View.YOffset = 0;
                Redraw();
                return;
            }

            _IntelliScrollPos += e.DeltaY/(double) 8;

            int scrollrows = (int) (_IntelliScrollPos)/View.RowHeight;
            if (scrollrows != 0)
            {
                _IntelliScrollPos -= scrollrows*View.RowHeight;
            }
            View.YOffset = - (int) _IntelliScrollPos;
            ScrollScreen(scrollrows);
        }