Re: JFormattedTextField c
To: comp.lang.java.gui
Eric Smith wrote:
I asked a question about JFormattedTextField, and Rogan Dawes wrote:
The question is, what do you define as a commit? A commit suggests
that there is some definite action that trigger the commit. That is
typically something like "pressing enter", etc. And that is exactly
what is happening here.
JFormattedTextField defines what a commit is, and allows the user
to specify a few choices about how and when to commit. I want to
be notified of exactly when JFormattedTextField does a commit,
and at no other times.
Oops, sorry. I actually haven't used J*Formatted*TextField before.
I agree that it doesn't seem to be possible to be notified of a commit,
other than by using a PropertyChangeListener, as you described
previously. For what it is worth, I tried it myself, and did get the
correct new and old values from the event.
Otherwise you are talking about a keypress, and that is easy to
monitor with a DocumentListener as well.
I specifically do NOT want to be notified of all keypresses, since
most of them do not trigger a commit. I mentioned before that
I tried using a DocumentListener and didn't get what I want.
It seems bizarre that whoever developed JFormattedTextField at
Sun went to all the trouble to implement and document various
commit behaviors, but not provide an explicit way to listen
for a commit.
Yes, it does seem odd that you can't do this easily.
The "best" way (using best loosely), seems to be to subclass
JFormattedTextField, override commitEdit, and take whatever action you
want after you have called super().commitEdit();
public class FormattedFieldTest {
public static void main(String[] args) {
JFrame frame = new JFrame();
final JFormattedTextField tf = new JFormattedTextField() {
public void commitEdit() throws ParseException {
super.commitEdit();
System.out.println("New value is : " + getValue());
}
};
tf.setValue(new Integer(100));
tf.setMinimumSize(new Dimension(300, 40));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new FlowLayout());
frame.getContentPane().add(tf);
frame.getContentPane().add(new JButton("A button"));
frame.pack();
frame.setVisible(true);
}
}
The button is added simply so that "focusLost" behaviour can be observed.
Hope this helps.
Rogan
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