Why does insertUpdate get called in my DocumentListener when I change focus? (Java Swing)

Question

I have a JTextField with a documentListener on it. I want to change the background color when I add or remove characters to this textfield. I should be using a document listener correct? It works, but it also fires when I gain and lose focus on this JTextfield, which is undesired. I do not add a focus listener on this JTextField. Here is my code, any suggestions on how I can fix my problem?

        numPlotRowsJTextField = BasicComponentFactory.createIntegerField(valueModelNumberPlotRowsJTextField);
        numPlotRowsJTextField.getDocument().addDocumentListener(new DocumentListener() {

        @Override
        public void removeUpdate(DocumentEvent e) 
        {
        }

        @Override
        public void insertUpdate(DocumentEvent e) 
        {
            numPlotRowsJTextField.setBackground(Color.cyan);
        }

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

Also note that I am using JGoodies Binding which I am starting to believe is the root of this problem. Swing w/o JGoodies shouldn't be firing off document listener events by changing focus...

Answer 1

I figured it out. It 100% had to do with JGoodies Binding.

This code works:

ValueModel valueModelNumberPlotRowsJTextField = adapter.getBufferedModel("numberOfPlotRows");
    valueModelNumberPlotRowsJTextField.addValueChangeListener(new PropertyChangeListener() {

        @Override
        public void propertyChange(PropertyChangeEvent evt) 
        {
            numPlotRowsJTextField.setBackground(Color.cyan);
        }
    });
    numPlotRowsJTextField = BasicComponentFactory.createIntegerField(valueModelNumberPlotRowsJTextField);

Since I am using JGoodies Binding, I have a ValueModel backing my JTextField. The listener has to be set there and not on the JTextField.