Re: Coordinating multiple JTextField updates across panels

From:

Knute Johnson <nospam@rabbitbrush.frazmtn.com>

Newsgroups:

comp.lang.java.gui

Date:

Tue, 16 Jun 2009 18:48:12 -0700

Message-ID:

<4a384b5c$0$23993$b9f67a60@news.newsdemon.com>

Daniel Pitts wrote:

Jarrick Chagma wrote:

I have a large number of text fields in a number of JPanel panels
visible on the screen at the same time and I would like to somehow
coordinate their updating. A button click can trigger an event which
updates every one of the text fields at the same time but there is a
noticeable effect of one field updating after the next one (and not
necessarily in any particular order) which is visually unattractive
and undesirable. I would prefer that the screen as a whole does not
update until all the text field's contents have changed. I can't do
double-buffering in this scenario as the fields are in different panels.

Is there a way to somehow coordinate these updates perhaps by turning
off screen redraw until all fields in all panels have updated?

Yes there is. Do your work on the EDT, instead of another thread.

Alternatively, calculate all the values off thread, and set them all
once on the EDT.

calling JLabel.setText and JTextField.setText will queue up a repaint
request, but that request won't be honored until the EDT is ready to
process more events.

Take a look at some of the test programs. Doing the work on the EDT
actually makes things worse and there is absolutely no reason to call
JTextField.setText() on the EDT.

--

Knute Johnson
email s/nospam/knute2009/

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