Adjusting a field size based upon its contents

[Francis Nugent Dixon]

Hi from Paris,

I have a hidden field that I want to display after I have put a 
specific text in it. The text is of variable size.

The size of field required is obviously based on the "textSize", 
"textFont" and "number of characters" values. I need to set the size of 
the field (rect) so that it is just big enough for the text to be 
displayed.

If I had a few days available, I could surely work out an algorithm to 
do this, but I need to get the new version of my application out of the 
door quickly.

Has anybody come across this problem (and solved it) ?

Many Thanks

-Francis