WeightColumns

gistfile1.cs

    public void WeightColumns(List<int> weights, List<int> fixedWidths)
    {
        if (TableStyles.Count <= 0) return;
        var tableStyle = TableStyles[0];
        if (tableStyle.GridColumnStyles.Count < 1) return;

        if (fixedWidths == null)
            fixedWidths = Enumerable.Repeat(0, tableStyle.GridColumnStyles.Count).ToList();
        if (weights == null)
            weights = Enumerable.Repeat(1, tableStyle.GridColumnStyles.Count).ToList();

        if (tableStyle.GridColumnStyles.Count != weights.Count)
            throw new Exception("Wrong number of weights for weighted column resizing");

        if (tableStyle.GridColumnStyles.Count != fixedWidths.Count)
            throw new Exception("Wrong number of fixedWidths for weighted column resizing");

        var verticalScrollBar = GetVScrollBar();
        var verticalScrollBarWidth = verticalScrollBar != null ? verticalScrollBar.Width : 0;

        SetColumnWidths(weights, fixedWidths, verticalScrollBarWidth, tableStyle);
        // Resize columns if that got rid of the vertical scrollbar
        if (verticalScrollBar != null && !verticalScrollBar.Visible)
            SetColumnWidths(weights, fixedWidths, 0, tableStyle);
    }

    private void SetColumnWidths(List<int> weights, List<int> fixedWidths, int verticalScrollBarWidth, DataGridTableStyle tableStyle)
    {
        var columnDividerCount = columnDividersCalculator(tableStyle.GridColumnStyles.Count);
        var usableWidth = (int) (ClientSize.Width 
                                  - verticalScrollBarWidth
                                  - BorderWidth * 2 * DpiMultiple
                                  - ColumnDividerWidth * columnDividerCount * DpiMultiple
                                  - fixedWidths.Sum());

        var totalWeight = weights.Sum();
        var fixedWidthIndex = 0;
        var columnWidths = weights.Select(x =>
                                          (int) (usableWidth*((float) x/totalWeight)) + fixedWidths[fixedWidthIndex++]
            ).ToList();
        var extraWidth = usableWidth + fixedWidths.Sum() - columnWidths.Sum();

        for (var index = 0; index < tableStyle.GridColumnStyles.Count; index++)
            tableStyle.GridColumnStyles[index].Width = columnWidths[index] + (index < extraWidth ? 1 : 0);
    }