4

How can I automatically increase/decrease TextBox and Windows Form size according to text Length?

Stephan Bauer
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Michel
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4 Answers4

10

You can try overriding the OnTextChanged event, then changing the Width depending on the size of the text.

protected override OnTextChanged(EventArgs e)
{
    using (Graphics g = CreateGraphics())
    {
        SizeF size = g.MeasureString(Text, Font);
        Width = (int)Math.Ceiling(size.Width);
    }
    base.OnTextChanged(e);
}
Connell
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  • I've never tried it on a TextBox TextChanged either ;) but it works for me when I'm resizing a UserControl based on an inner Label's Text. – Connell Nov 14 '11 at 16:40
  • i always followed above answer what I proposed. I never worked on Override – Sandy Nov 14 '11 at 16:52
  • @rapsalands without overriding, all `OnTextChanged(EventArgs e)` does is fire the events. They do exactly the same thing so it'll still work. – Connell Nov 14 '11 at 17:23
  • no no...i know it will still work and i was just saying i have not worked on override techniques ever. I am kinda new in this field, got to learn and explore a lot. I liked your technique and that's why added this question in my favorites so I can refer it anytime. Thanks. – Sandy Nov 14 '11 at 19:35
  • @rapsalands it certainly has its benefits :) a good field to learn. cheers! – Connell Nov 14 '11 at 21:55
2

Try this, it will also work...

Here I have taken 100 as minimum width of textbox. "txt" is TextBox.

const int width = 100;

private void textBox1_TextChanged(object sender, EventArgs e)
{
    Font font = new Font(txt.Font.Name, txt.Font.Size);

    Size s = TextRenderer.MeasureText(txt.Text, font);
    if (s.Width > width)
    {
        txt.Width = s.Width;
    }
}

Hope it helps.

Sandy
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1

Here is better solution. Scenario is: I have a textbox that Filled on form (usercontrol). So, I want to change Form Height each time number of line in textBox change, but its height is not less than MinHeight (a constant)

private void ExtendFormHeight()
        {
            int heightChanged = txtText.PreferredSize.Height - txtText.ClientSize.Height;
            if (Height + heightChanged > MinHeight)
            {
                Height += heightChanged;
            }
            else
            {
                Height = MinHeight;
            }
        }

Hope this help!

zquanghoangz
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-2

set width to Auto in properties

user2075288
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