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

        public int RowYDifference(int row1, int row2)
        {
            if (row1 == row2)
                return 0;

            if (this.TableModel == null || this.TableModel.Rows == null)
                return 0;

            int r1 = Math.Min(row1, row2);
            int r2 = Math.Max(row1, row2);

            if (r2 > this.TableModel.Rows.Count)
                r2 = this.TableModel.Rows.Count;

            int ydiff = 0;
            RowCollection rows = this.TableModel.Rows;
            for (int i = r1; i < r2; i++)
            {
                // Don't count this row if it is currently a hidden subrow
                Row row = rows[i];
                if (row != null)
                {
                    if (row.Parent == null || row.Parent.ExpandSubRows)
                        ydiff += row.Height;
                }
            }

            if (r1 == row1)
            {
                // Row2 > Row1 so return a +ve
                return ydiff;
            }
            else
            {
                // Row2 < Row1 so return a -ve
                return -ydiff;
            }
        }