<Swing Dev> Updating a JComboBox's values at popup-opening-time

[Clemens Eisserer]

Hello,

This is both a question and (if its really a problem) maybe an idea
for enhancement.

I've a JComboBox which should update its values at the time it is
opened (because the come from a source which changes from time to time
during the life of the JComboBox and I don't want to update it
periodically).
What I did was to register a PopupListener and changed the item of the
ComboBox but the problem was that the Popup already existed - and
although its values were updated its size was not.
If I e.g. had 1 entry before the update and 4 afterwards I got a list
with the size of 1 entry with very small scrollbars.

The root of the problem seems to be that there is no legal way to
access the BasicComboPopup (or whatever its called), as far as I've
seen.

Could my stuff be done in another way which would not cause the
problems mentioned above? I currently did a hack which calls
showPopup/hidePopup in the listener so that the too small list is
hidden and afterwards the larger list appears but thats really a hack.

I wonder wether it would be ok to work on that stuff so that the list
re-calculates its size also when items are removed/added when the
popup is already visible? Do you think that could break something?

Please feel free to send commend, I would be really happy about suggestions.

lg Clemens