JFormattedTextField and empty text

Hi people,

hitting an obstacle (again - the fields in text form and I will be ever friends ;-)

The requirement is quite simple: do something when you get a 'value' - changed (aka: validation) and engage in the combination of keys. The solution seems easy enough also: force a validation at each change of document. Which works very well (never forget a validation fails if the user has typed in the text, nothing happens in this case is correct). Except when you delete the last character: No. value-changed because most of the trainers don't empty card string for the null value. As I have no control on the trainer (in this case - extended SwingX NumberFormatter handles it graciously :-)) I came with a dirty trick: If a forced validation failed and the text in the field is empty, set the value to null.

Don't like... so any other ideas? I hope that I am wrong and some kind soul can point me to the right path

Thank you
Jeanette


Here's an example: to see what I mean (and probably described bad :-) remove numbers until the field is empty.) When you delete the last no modified value is triggered and transfer the focus to the button restores the text to the last valid value. Uncomment the dirt makes to behave as I want.
/*
 * Created on 25.11.2010
 *
 */
package de.javasoft.swing.jytable;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.text.ParseException;

import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.Document;

public class FormattedNull {

    private JFormattedTextField field;

    private JComponent createContent() {
        JComponent content = new JPanel();
        field = new JFormattedTextField(new Integer(55));
        field.setColumns(20);
        field.addPropertyChangeListener(getPropertyChangeListener());
        field.getDocument().addDocumentListener(getDocumentListener());
        content.add(field);
        content.add(new JButton("just something focusable"));
        return content;
    }

    protected void maybeCommitEdit(Document document) {
        try {
            field.commitEdit();
        } catch (ParseException e) {
            // uncomment to map empty string to null
//            if (field.getText().length() == 0) {
//                field.setValue(null);
//            }
        }
    }

    private PropertyChangeListener getPropertyChangeListener() {
        PropertyChangeListener propertyChangeListener = new PropertyChangeListener() {

            @Override
            public void propertyChange(PropertyChangeEvent evt) {
                if ("value".equals(evt.getPropertyName()))
                    matchValueChanged(evt.getNewValue());
            }
        };
        return propertyChangeListener;
    }

    protected void matchValueChanged(Object value) {
        System.out.println("got new value: " + value);
    }

    private DocumentListener getDocumentListener() {
        DocumentListener documentListener = new DocumentListener() {

            @Override
            public void removeUpdate(DocumentEvent e) {
                maybeCommitEdit(e.getDocument());
            }

            @Override
            public void insertUpdate(DocumentEvent e) {
                maybeCommitEdit(e.getDocument());
            }

            @Override
            public void changedUpdate(DocumentEvent e) {
            }
        };
        return documentListener;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new JFrame("");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new FormattedNull().createContent());
                frame.setLocationRelativeTo(null);
                frame.pack();
                frame.setVisible(true);
            }
        });
    }

}

too bad validation fails if the user has typed in the text, nothing happens in this case is correct

So if a text is empty if it is not a valid text according to the trainer, then this is correct? So there is no problem :).

But yes my text field shaped on is the same as your solution (if authorized null):

    @Override
    public void commitEdit() throws ParseException {
        if(allowsNull() && isBlank()) {
            setValue(null);
        }
        else {
            super.commitEdit();
         }
    }

Tags: Java

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