Focus events for JFormattedTextFields

Question

I have a form with 2 JFormattedTextFields for width and height values. I only want numbers entered in the fields so I configure a formatter like
NumberFormat numFormat;
     numFormat = NumberFormat.getInstance();
     numFormat.setMinimumFractionDigits(2);
     numFormat.setMaximumFractionDigits(2);
     nonscaledWidthField = new JFormattedTextField(numFormat);
     nonscaledHeightField = new JFormattedTextField(numFormat);
This works as desired. Additionally, I want to catch constrain the width and height values to a certain aspect ratio. So if the user enters a value for width, when they tab out and/or lose focus on that field, it should calculate and set the value for height. I'm able to do that by implementing FocusListener or using the PropertyChangeListener but then the NumberFormat doesn't seem to respond on the fields.
How can I get both behaviours?
-Phil

Answer 1

It's hard to comment without a better knowledge of your situation. If you would create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program that demonstrates the problem you are experiencing, that would help us help you.
That said, what you describe certainly sounds like it ought to work. That's where the example program would come in handy. My first thought is that your focus listener is firing before the formatted text field has updated its value; you can ensure this is not the case by invoking the field's commitEdit() method.
: jay