XPTable.Models.Table.GetNewTopRowIndex C# (CSharp) Method

        protected int GetNewTopRowIndex(int previousTopRowIndex, int howMany)
        {
            int visibleRows = this.vScrollBar.LargeChange - 1;
            bool down = (howMany > 0);

            int max = Math.Abs(howMany);

            int column = this.ColumnModel.NextVisibleColumn(-1);
            CellPos newCell = new CellPos(previousTopRowIndex, column);  // The row currently at the top

            for (int i = 0; i < max; i++)
            {
                // The first cell on the row we are going to (if all is well)
                // Changed to fix scrolling bug (ID - 2848790) reported by Tom Nolan ( lordicarus )
                newCell = this.FindNextVisibleCell(newCell, true, down, false, false, true);
            }

            return newCell.Row;
        }