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From: "Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this>
Subject: Re: Can a jPanel's backgr
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Date: Wed, 27 Apr 2011 15:35:19 GMT
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  To: comp.lang.java.gui
Philipp wrote:
>Andrew Thompson a |-crit :
>>>> In any case, it is possible to *extend* JPanel (or jPanel, 
>>>> I am guessing) to provide a method that will do that.
..

Please refrain from 'full-quoting'.  Selective trimming 
of earlier posts does wonders.  Note that my current
web interface to usenet automatically trims most text
before I get to reply.

>Shouldn't the GUI be updated from the EDT thread? How would this be done?

Yes and no.

The 'rule' is that UI updates outside the EDT should
be updated using invokeLater, something like..

<snippet>
  public void run() {
    while (true) {
      if ( flashing ) {
        active = !active;
        Runnable r = new Runnable(){
          public void run(){
            repaint();
          }
        };
        EventQueue.invokeLater(r);

        if ( System.currentTimeMillis()-startFlash>lengthFlash ) {
          flashing = false;
        }
      }
      try {
        Thread.sleep(400);
      } catch (InterruptedException ie) {
        // wake and continue
      }
    }
  }
</snippet>

I say 'rule' because I have never observed any GUI
problems to be caused by ignoring it.

(shrugs) YMMV.

[ Waits for the invokeLater devotees to jump in with
lots of long words and remonstrations - with no code 
that can back up the claims. ]

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