Path Display in Label

Question

Are there any automatic methods for trimming a path string in .NET?

For example:

C:\Documents and Settings\nick\My Documents\Tests\demo data\demo data.emx

becomes

C:\Documents...\demo data.emx

It would be particularly cool if this were built into the Label class, and I seem to recall it is--can't find it though!

Answer 1

Use TextRenderer.DrawText with TextFormatFlags.PathEllipsis flag

void label_Paint(object sender, PaintEventArgs e)
{
  Label label = (Label)sender;
  TextRenderer.DrawText(e.Graphics, label.Text, label.Font, label.ClientRectangle, label.ForeColor, TextFormatFlags.PathEllipsis);
}

Your code is 95% there. The only problem is that the trimmed text is drawn on top of the text which is already on the label.

Yes thanks, I was aware of that. My intention was only to demonstrate use of DrawText method. I didn't know whether you want to manually create event for each label or just override OnPaint() method in inherited label. Thanks for sharing your final solution though.

Answer 2

@ lubos hasko Your code is 95% there. The only problem is that the trimmed text is drawn on top of the text which is already on the label. This is easily solved:

    Label label = (Label)sender;
    using (SolidBrush b = new SolidBrush(label.BackColor))
        e.Graphics.FillRectangle(b, label.ClientRectangle);
    TextRenderer.DrawText(
        e.Graphics, 
        label.Text, 
        label.Font, 
        label.ClientRectangle, 
        label.ForeColor, 
        TextFormatFlags.PathEllipsis);

Answer 3

Not hard to write yourself though:

    public static string TrimPath(string path)
    {
        int someArbitaryNumber = 10;
        string directory = Path.GetDirectoryName(path);
        string fileName = Path.GetFileName(path);
        if (directory.Length > someArbitaryNumber)
        {
            return String.Format(@"{0}...\{1}", 
                directory.Substring(0, someArbitaryNumber), fileName);
        }
        else
        {
            return path;
        }
    }

I guess you could even add it as an extension method.