Is it possible to have Multi-line DataGridView cells without wrapping text?

Question

I know I can set WrapMode to true on the DefaultCellStyle of the RowTemplate, however this doesn\'t give me the behaviour I want. I am dis

Answer 1

This class get the DataGridView instance and add the behavior for trimming multi line elipsis (...) for width and height as well.

Usage:

MultilineTriming.Init(ref dataGridView); // that's it!

Enjoy,

public static class MultilineTriming
{
    private static int _rowMargins;

    public static void Init(ref DataGridView dataGridView)
    {
        dataGridView.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.None;
        dataGridView.DefaultCellStyle.WrapMode = DataGridViewTriState.False;

        _rowMargins = dataGridView.RowTemplate.Height - dataGridView.Font.Height;

        Unregister(dataGridView);

        dataGridView.CellEndEdit += DataGridViewOnCellEndEdit;
        dataGridView.CellPainting += DataGridViewOnCellPainting;
        dataGridView.RowsAdded += DataGridViewOnRowsAdded;
        dataGridView.Disposed += DataGridViewOnDisposed;
    }

    private static void DataGridViewOnRowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
    {
        DataGridView view = sender as DataGridView;
        DataGridViewRow row = view.Rows[e.RowIndex];
        foreach (DataGridViewCell cell in row.Cells)
        {
            if (cell.FormattedValue == null)
            {
                continue;
            }
            Size size = TextRenderer.MeasureText((string)cell.FormattedValue, view.Font);
            row.Height = Math.Max(size.Height + _rowMargins, row.Height);
        }
    }

    private static void DataGridViewOnDisposed(object sender, EventArgs eventArgs)
    {
        DataGridView dataGridView = sender as DataGridView;
        Unregister(dataGridView);

    }

    public static void Unregister(DataGridView dataGridView)
    {
        dataGridView.RowsAdded -= DataGridViewOnRowsAdded;
        dataGridView.CellEndEdit -= DataGridViewOnCellEndEdit;
        dataGridView.CellPainting -= DataGridViewOnCellPainting;
    }

    private static void DataGridViewOnCellEndEdit(object sender, DataGridViewCellEventArgs e)
    {
        DataGridView view = sender as DataGridView;
        DataGridViewRow row = view.Rows[e.RowIndex];
        DataGridViewCell cell = row.Cells[e.ColumnIndex];

        string text = (string)cell.FormattedValue;

        if (string.IsNullOrEmpty(text)) return;

        Size size = TextRenderer.MeasureText(text, view.Font);
        row.Height = Math.Max(size.Height + _rowMargins, row.Height);
    }

    private static void DataGridViewOnCellPainting(object sender, DataGridViewCellPaintingEventArgs e)
    {
        if (e.ColumnIndex == -1 || e.RowIndex == -1 || e.FormattedValue == null)
        {
            return;
        }
        e.Paint(e.ClipBounds, DataGridViewPaintParts.All ^ DataGridViewPaintParts.ContentForeground);

        DataGridView view = sender as DataGridView;

        string textToDisplay = TrimTextToFit(string.Format("{0}", e.FormattedValue), (int)(e.CellBounds.Width * 0.96) - 3, e.CellBounds.Height - _rowMargins, view.Font);

        bool selected = view.Rows[e.RowIndex].Cells[e.ColumnIndex].Selected;
        SolidBrush brush = new SolidBrush(selected ? e.CellStyle.SelectionForeColor : e.CellStyle.ForeColor);

        e.Graphics.DrawString(textToDisplay, view.Font, brush, e.CellBounds.X + 1, e.CellBounds.Y + _rowMargins / 2);

        e.Handled = true;
    }

    private static string TrimTextToFit(string text, int contentWidth, int contentHeight, Font font)
    {
        Size size = TextRenderer.MeasureText(text, font);

        if (size.Width < contentWidth && size.Height < contentHeight)
        {
            return text;
        }

        int i = 0;
        StringBuilder sb = new StringBuilder();
        while (i < text.Length)
        {
            sb.Append(text[i++]);
            size = TextRenderer.MeasureText(sb.ToString(), font);

            if (size.Width < contentWidth) continue;

            sb.Append("...");

            while (sb.Length > 3 && size.Width >= contentWidth)
            {
                sb.Remove(sb.Length - 4, 1);
                size = TextRenderer.MeasureText(sb.ToString(), font);
            }

            while (i < text.Length && text[i] != Environment.NewLine[0])
            {
                i++;
            }
        }
        string res = sb.ToString();

        if (size.Height <= contentHeight)
        {
            return res;
        }

        string[] lines = res.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
        i = lines.Length;
        while (i > 1 && size.Height > contentHeight)
        {
            res = string.Join(Environment.NewLine, lines, 0, --i);
            size = TextRenderer.MeasureText(res, font);
        }

        return res;
    }
}