问题
I have a jFormattedTextField and I set setCommitsOnValidEdit to true then I added an event listener to "property change" on "value" property.
At first focus of that jFormattedTextField it doesn't call event listener method when typing in it. But on "focusLost" it calls event listener and after that when it receives focus again it calls event listener when typing.
I want the event listener be called after any change in any time in that jFormattedTextField (Even in the fist focus).
What's the problem? How can I fix it?
回答1:
probably you have to look at DocumentListener example here
EDIT:
I know this issue from my 1st touch of JFormattedTextField, here comings example that isn't works at firts focusLost :-) and probably demonstrated your issue
minimum limit is there set at 10.000,- for both JFormattedTextField,
1st. JFormattedTextField handling FocusListener (output must be delayed into invokeLater)
2nd. JFormattedTextField handling DocumentListener (works every...)
inital look
here is same problem, because I put here only 500,- and on focusLost nothing changed, correct amount must be >= 10.000,-
on 2dn. focusLost works ....
no idea how is that possible, but solved by wrapping into invokeLater(), then works on 1st. focusLost (you have to uncomment these code lines)
from code
import java.awt.*;
import java.awt.event.*;
import java.math.RoundingMode;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
public class FormatterLimit {
private JFrame frame = new JFrame();
private JPanel pnl = new JPanel();
private JLabel focusLabel = new JLabel(" focusLost Handle ");
private JFormattedTextField formTextField;
private JLabel docLabel = new JLabel(" document Handle ");
private JFormattedTextField formTextField1;
private NumberFormat formTextFieldFormat;
private double amount = 10000.00;
public FormatterLimit() {
formTextFieldFormat = NumberFormat.getNumberInstance();
formTextFieldFormat.setMinimumFractionDigits(2);
formTextFieldFormat.setMaximumFractionDigits(2);
formTextFieldFormat.setRoundingMode(RoundingMode.HALF_UP);
focusLabel.setFont(new Font("Serif", Font.BOLD, 14));
focusLabel.setForeground(Color.blue);
focusLabel.setPreferredSize(new Dimension(120, 27));
formTextField = new JFormattedTextField(formTextFieldFormat);
formTextField.setValue(amount);
formTextField.setFont(new Font("Serif", Font.BOLD, 22));
formTextField.setForeground(Color.black);
formTextField.setBackground(Color.yellow);
formTextField.setPreferredSize(new Dimension(120, 27));
formTextField.setHorizontalAlignment(SwingConstants.RIGHT);
formTextField.addFocusListener(new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
formTextField.requestFocus();
formTextField.setText(formTextField.getText());
formTextField.selectAll();
}
@Override
public void focusLost(FocusEvent e) {
//Runnable doRun = new Runnable() {
//@Override
//public void run() {
double t1a1 = (((Number) formTextField.getValue()).doubleValue());
if (t1a1 < 1000) {
formTextField.setValue(amount);
}
//}
// };
//SwingUtilities.invokeLater(doRun);
}
});
docLabel.setFont(new Font("Serif", Font.BOLD, 14));
docLabel.setForeground(Color.blue);
docLabel.setPreferredSize(new Dimension(120, 27));
formTextField1 = new JFormattedTextField(formTextFieldFormat);
formTextField1.setValue(amount);
formTextField1.setFont(new Font("Serif", Font.BOLD, 22));
formTextField1.setForeground(Color.black);
formTextField1.setBackground(Color.yellow);
formTextField1.setPreferredSize(new Dimension(120, 27));
formTextField1.setHorizontalAlignment(SwingConstants.RIGHT);
formTextField1.addFocusListener(new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
formTextField1.requestFocus();
formTextField1.setText(formTextField1.getText());
formTextField1.selectAll();
}
@Override
public void focusLost(FocusEvent e) {
}
});
formTextField1.getDocument().addDocumentListener(docListener);
pnl = new JPanel();
pnl.setBorder(new EmptyBorder(2, 2, 2, 2));
pnl.setLayout(new GridLayout(2, 2));
pnl.add(focusLabel);
pnl.add(formTextField);
pnl.add(docLabel);
pnl.add(formTextField1);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(pnl, BorderLayout.CENTER);
frame.setLocation(200, 200);
frame.pack();
frame.setVisible(true);
formTextFieldFocus1();
}
//
private DocumentListener docListener = new DocumentListener() {
@Override
public void changedUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
@Override
public void insertUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
@Override
public void removeUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
private void printIt(DocumentEvent documentEvent) {
DocumentEvent.EventType type = documentEvent.getType();
double t1a1 = (((Number) formTextField1.getValue()).doubleValue());
if (t1a1 < 1000) {
Runnable doRun = new Runnable() {
@Override
public void run() {
formTextField1.setValue(amount);
}
};
SwingUtilities.invokeLater(doRun);
}
}
};
private void formTextFieldFocus1() {
Runnable doRun = new Runnable() {
@Override
public void run() {
formTextField1.grabFocus();
formTextField1.requestFocus();
formTextField1.setText(formTextField1.getText());
formTextField1.selectAll();
}
};
SwingUtilities.invokeLater(doRun);
}
private void formTextFieldFocus() {
Runnable doRun = new Runnable() {
@Override
public void run() {
formTextField.grabFocus();
formTextField.requestFocus();
formTextField.setText(formTextField.getText());
formTextField.selectAll();
formTextFieldFocus1();
}
};
SwingUtilities.invokeLater(doRun);
}
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
FormatterLimit fl = new FormatterLimit();
}
});
}
}
回答2:
Actually, setCommitOnValidEdit should work always as you expect (and does in the code snippet below), no need for a DocumentListener, after all, the method is exactly for that purpose. So I suspect something else is wrong in your context. Or for some reason the very first edit isn't parsed to anything valid?
NumberFormatter numberFormatter = new NumberFormatter(
NumberFormat.getIntegerInstance());
// allow or not doesn't make a difference
numberFormatter.setAllowsInvalid(false);
numberFormatter.setCommitsOnValidEdit(true);
JFormattedTextField readTimeOut = new JFormattedTextField(numberFormatter);
PropertyChangeListener l = new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
LOG.info("got new value: " + evt.getNewValue());
}
};
readTimeOut.addPropertyChangeListener("value", l);
readTimeOut.setColumns(20);
readTimeOut.setHorizontalAlignment(SwingConstants.RIGHT);
JFormattedTextField other = new JFormattedTextField(numberFormatter);
other.addPropertyChangeListener("value", l);
other.setColumns(20);
other.setHorizontalAlignment(SwingConstants.RIGHT);
JPanel box = new JPanel();
box.add(readTimeOut);
box.add(other);
来源：https://stackoverflow.com/questions/7283334/jformattedtextfields-formatter-setcommitsonvalidedittrue-doesnt-work-at-firs