SourceGrid.GridVirtual.GetScrollRows C# (CSharp) Method

        protected override int GetScrollRows(int displayHeight)
        {
            int currentHeight = 0;
            int scrollRows = 0;

            //Remove the fixed rows from the scrollable area
            for (int f = 0; f < ActualFixedRows; f++)
                displayHeight -= Rows.GetHeight(f);

            //Calculate the rows to be scrolled
            for (int r = Rows.Count - 1; r >= ActualFixedRows; r--)
            {
                currentHeight += Rows.GetHeight(r);

                if (currentHeight > displayHeight)
                    return Rows.Count - scrollRows;

                scrollRows++;
            }

            return 0;
        }