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Groups > comp.lang.java.gui > #4732

Re: JComboBox drop-down arrow disappears

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On Tue, 1 Nov 2011 08:40:06 -0700 (PDT), Amandil <mazwolfe@gmail.com>
wrote, quoted or indirectly quoted someone who said :

>Does anyone else have this problem? Is it documented anywhere? Calling
>removeAllItems() on a JComboBox caused the drop-down arrow to
>disappear. It did not reappear even after the JComboBox was
>repopulated.
>(The code is rather long, though I can attach it if someone would need
>it to help with this issue).

Tying up the EDT thread so that the system never gets around to
handling the repaint is a common cause of such problems.

The classic newbie error is sleeping the EDT thread. You might have
done a more subtle form of that error.

-- 
Roedy Green Canadian Mind Products
http://mindprod.com
It's difficult to be rigorous about whether a machine really knows,
thinks, etc., because we’re hard put to define these things. 
We understand human mental processes only slightly better than
a fish understands swimming. 
~ John McCarthy (born: 1927-09-04 died: 2011-10-23 at age: 84).
Inventor of the term AI (Artificial Intelligence), 
the short-circuit OR operator (|| in Java), 
and LISP (LIst Processing Language) that makes EMACS 
(Extensible MACro System) so addictive.

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JComboBox drop-down arrow disappears Amandil <mazwolfe@gmail.com> - 2011-11-01 08:40 -0700
  Re: JComboBox drop-down arrow disappears Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-11-01 09:29 -0700
  Re: JComboBox drop-down arrow disappears "John B. Matthews" <nospam@nospam.invalid> - 2011-11-01 13:06 -0400
    Re: JComboBox drop-down arrow disappears Roedy Green <see_website@mindprod.com.invalid> - 2011-11-01 23:20 -0700
  Re: JComboBox drop-down arrow disappears Nigel Wade <nmw-news@ion.le.ac.uk> - 2011-11-01 17:31 +0000
    Re: JComboBox drop-down arrow disappears Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2011-11-01 10:48 -0700
    Re: JComboBox drop-down arrow disappears Roedy Green <see_website@mindprod.com.invalid> - 2011-11-01 23:22 -0700
  Re: JComboBox drop-down arrow disappears Amandil <mazwolfe@gmail.com> - 2011-11-01 13:22 -0700
  Re: JComboBox drop-down arrow disappears Roedy Green <see_website@mindprod.com.invalid> - 2011-11-01 23:19 -0700
  Re: JComboBox drop-down arrow disappears Bent C Dalager <bcd@pvv.ntnu.no> - 2011-11-02 09:41 +0000
  Re: JComboBox drop-down arrow disappears "dp" <newsgroups@phagia.net> - 2011-11-06 12:14 +0000

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