AutoFit Label Font Size

Question

For a System.Windows.Forms.Label is there a way to auto-fit the label font size depending on the label size?

Answer 1

I think you would need to override the paint method to solve this, and paint on your own text. But you'll have to use the MeasureString method of GDI+ to get the size of the text, so the routine which will tell you the correct font size will work in a trial-and-error fashion.

Answer 2

class AutoFontLabel : Label
{
    public AutoFontLabel()
        : base()
    {
        this.AutoEllipsis = true;
    }

    protected override void OnPaddingChanged(EventArgs e)
    {
        UpdateFontSize();
        base.OnPaddingChanged(e);
    }

    protected override void OnResize(EventArgs e)
    {
        UpdateFontSize();
        base.OnResize(e);
    }

    private void UpdateFontSize()
    {
        int textHeight = this.ClientRectangle.Height
            - this.Padding.Top - this.Padding.Bottom;

        if (textHeight > 0)
        {
            this.Font = new Font(this.Font.FontFamily,
                textHeight, GraphicsUnit.Pixel);
        }
    }
}

Thanks to AMissico that updated the control to handle padding. We can see how changing the Padding and TextAlign are affectd in the designer.