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Java Forum / General / November 2007

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How to refresh a JTextField before continuing execution?

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Ramon F Herrera - 13 Nov 2007 01:58 GMT
Hello:

In several of my Dialogs, I have some phone number, file path, etc. in
a JTextField. Then there is an button that starts some long running
class. My problem is that I would like to convert the {phone number,
SSN, file path} to its canonical form and have the user see it
*before* the long running class starts.

For example, I have a dialog that contains two filepaths with the DOS
backslashes (as returned by JFileChooser), and I would prefer them to
be shown with forward slashes ASAP. Currently, the replacement takes
places after the long running 'ProcessTIFF' instance ends.

final JButton matchAllFilesButton = new JButton();
matchAllFilesButton.addActionListener(new ActionListener() {
   public void actionPerformed(final ActionEvent e) {
       String srcStr = sourceDirTextField.getText().replace('\\',
'/');
       String dstStr = destinDirTextField.getText().replace('\\',
'/');
       sourceDirTextField.setText(srcStr);
       destinDirTextField.setText(dstStr);
       // would like to insert some sort of sleep() or 'redraw' here
       new ProcessTIFF(sourceDirTextField.getText(),
destinDirTextField.getText());
   }
});

I would like to provide a more expedient visual feedback to my users.

TIA,

-Ramon
Andrew Thompson - 13 Nov 2007 02:12 GMT
...
>I would like to provide a more expedient visual feedback to my users.

So don't 'block the EDT'.

Signature

Andrew Thompson
http://www.athompson.info/andrew/

Ramon F Herrera - 13 Nov 2007 02:17 GMT
> ..
>
> >I would like to provide a more expedient visual feedback to my users.
>
> So don't 'block the EDT'.

I was afraid threads would be involved...

-Ramon
Lew - 13 Nov 2007 02:19 GMT
>> ..
>>
>>> I would like to provide a more expedient visual feedback to my users.
>> So don't 'block the EDT'.
>
> I was afraid threads would be involved...

Thread issues are always involved in GUI development.

Signature

Lew

Roedy Green - 13 Nov 2007 02:44 GMT
On Mon, 12 Nov 2007 17:58:34 -0800, Ramon F Herrera
<ramon@conexus.net> wrote, quoted or indirectly quoted someone who
said :

>I would like to provide a more expedient visual feedback to my users.

You change the value, then normally you exit the event handler to give
repaint a change to update the screen.  

Otherwise you should do the work on a different thread from the EDT
and use SwingUtilities.invokeLater.

See http://mindprod.com/jgloss/swingthreads.html
Signature

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

Knute Johnson - 13 Nov 2007 05:19 GMT
> Hello:
>
[quoted text clipped - 29 lines]
>
> -Ramon

Just move your long running task away from the EDT.  Put it in a simple
Runnable and start it.

Runnable r = new Runnable() {
    public void run() {
        // long running task goes here
    }
};
new Thread(r).start();

You can leave this code in the actionPerformd() method and it should
work just fine.  If you need to prevent any GUI actions from happening
while that task is running, disable the button or whatever that starts
it until your long running task is done.

Signature

Knute Johnson
email s/nospam/knute/



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