A ChangeListener on a javabean with a JSlider

Question

I'm trying to figure out event handling. ColorSelector and LabelSliderText are beans.
There are two instances of the ColorSelector bean in my JFrame, "foreground" and "background".
Whenever a slider is moved, that LabelSliderText instance will print out the value to the console. The problem with that is that there are six sliders, three in each ColorSelector.
What I really want to do is for each ColorSelector to grab the red, green, blue values from its LabelSliderText instances in order to create a Color. I'm thinking that this should occur not in LabelSliderText, where the listener is now, but in ColorSelector so that it can listen to its own beans.
How do these two beans interact? I want to put a listener on the JSlider, but not from LabelSliderText but actually from LabelSliderText, I think. Does this make sense?
I'm not quite sure how to move the listener from LabelSliderText to ColorSelector, if that would accomplish the purpose of grabbing the RGB values to create a Color.
thufir@arrakis:~/bcit3621$
thufir@arrakis:~/bcit3621$ cat lab2/src/a00720398/util/LabelSliderText.java
package a00720398.util;
public class LabelSliderText extends javax.swing.JPanel {
    /** Creates new form LabelSliderText */
    public LabelSliderText() {
        initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    private void initComponents() {//GEN-BEGIN:initComponents
bindingGroup = new org.jdesktop.beansbinding.BindingGroup();
jLabel1 = new javax.swing.JLabel();
jSlider1 = new javax.swing.JSlider();
jTextField1 = new javax.swing.JTextField();
setAutoscrolls(true);
jLabel1.setText("RGB");
add(jLabel1);
jSlider1.setMaximum(255);
jSlider1.setValue(0);
jSlider1.addChangeListener(new javax.swing.event.ChangeListener() {
public void stateChanged(javax.swing.event.ChangeEvent evt) {
sliderMoved(evt);
        add(jSlider1);
        jTextField1.setMinimumSize(new java.awt.Dimension(600, 29));
        org.jdesktop.beansbinding.Binding binding = org.jdesktop.beansbinding.Bindings.createAutoBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, jSlider1, org.jdesktop.beansbinding.ELProperty.create("${value}"), jTextField1, org.jdesktop.beansbinding.BeanProperty.create("text"));
        bindingGroup.addBinding(binding);
        add(jTextField1);
        bindingGroup.bind();
    }//GEN-END:initComponents
    private void sliderMoved(javax.swing.event.ChangeEvent evt) {//GEN-FIRST:event_sliderMoved
System.out.println(jSlider1.getValue());
}//GEN-LAST:event_sliderMoved
    public void setLabelText(String string){
        jLabel1.setText(string);
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel jLabel1;
    private javax.swing.JSlider jSlider1;
    private javax.swing.JTextField jTextField1;
    private org.jdesktop.beansbinding.BindingGroup bindingGroup;
    // End of variables declaration//GEN-END:variables
thufir@arrakis:~/bcit3621$
thufir@arrakis:~/bcit3621$ cat lab2/src/a00720398/util/ColorSelector.java
package a00720398.util;
public class ColorSelector extends javax.swing.JPanel {
    /** Creates new form ColorSelector */
    public ColorSelector() {
        initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    private void initComponents() {//GEN-BEGIN:initComponents
red = new a00720398.util.LabelSliderText();
green = new a00720398.util.LabelSliderText();
blue = new a00720398.util.LabelSliderText();
setLayout(new javax.swing.BoxLayout(this, javax.swing.BoxLayout.Y_AXIS));
red.setLabelText("red");
add(red);
green.setLabelText("green");
add(green);
blue.setLabelText("blue");
add(blue);
}//GEN-END:initComponents
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private a00720398.util.LabelSliderText blue;
    private a00720398.util.LabelSliderText green;
    private a00720398.util.LabelSliderText red;
    // End of variables declaration//GEN-END:variables
thufir@arrakis:~/bcit3621$ thanks,
Thufir

Answer 1

I think that I'm missing an ActionEvent, but maybe not.
/** handling of Customizer GUI actions */
   public void actionPerformed(ActionEvent e) {
     if (e.getSource()==applyButton) {
       myJavaBeanObj.setBlah(blahTextField.getText());
       support.firePropertyChange("blah",null,null);
   }The constructor you describe throws me off a bit. Does it matter that the listener is added from initComponents()? I don't see that it really would, but perhaps there's a subtlety I'm not seeing.
* LabelSliderText.java
* Created on July 13, 2008, 1:15 AM
package a00720398.util;
* @author  thufir
public class LabelSliderText extends javax.swing.JPanel {
    /** Creates new form LabelSliderText */
    public LabelSliderText() {
        initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    private void initComponents() {
        jLabel1 = new javax.swing.JLabel();
        jSlider1 = new javax.swing.JSlider();
        jTextField1 = new javax.swing.JTextField();
        setLayout(new java.awt.GridBagLayout());
        jLabel1.setText("jLabel1");
        add(jLabel1, new java.awt.GridBagConstraints());
        jSlider1.setMaximum(250);
        jSlider1.setValue(0);
        jSlider1.addChangeListener(new javax.swing.event.ChangeListener() {
            public void stateChanged(javax.swing.event.ChangeEvent evt) {
                LabelSliderText.this.stateChanged(evt);
        /* post listener */
        add(jSlider1, new java.awt.GridBagConstraints());
        jTextField1.setText("jTextField1");
        add(jTextField1, new java.awt.GridBagConstraints());
    private void stateChanged(javax.swing.event.ChangeEvent evt) {
        getValue();
    public void setLabel(String string){
        jLabel1.setText(string);
    public int getValue(){
        return jSlider1.getValue();
    public void setValue(){
        //throw new UnsupportedOperationException("Not supported yet.");
        jSlider1.setValue(0);
    // Variables declaration - do not modify
    private javax.swing.JLabel jLabel1;
    private javax.swing.JSlider jSlider1;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration
package a00720398.util;
import java.awt.*;
import javax.swing.event.*;
public class ColorChooser extends javax.swing.JPanel implements ChangeListener {
    private Color color = new Color(0, 0, 0);
    public ColorChooser() {
        initComponents();
    private void initComponents() {
        red = new a00720398.util.LabelSliderText();
        green = new a00720398.util.LabelSliderText();
        blue = new a00720398.util.LabelSliderText();
        setLayout(new javax.swing.BoxLayout(this, javax.swing.BoxLayout.Y_AXIS));
        red.setLabel("red       ");
        add(red);
        green.setLabel("green     ");
        add(green);
        blue.setLabel("blue      ");
        add(blue);
    public void stateChanged(ChangeEvent evt) {
        sliderMoved(evt);
    private void sliderMoved(ChangeEvent evt) {
        color = new Color (red.getValue(), green.getValue(), blue.getValue());
        System.out.println(color);
    // Variables declaration - do not modify
    private a00720398.util.LabelSliderText blue;
    private a00720398.util.LabelSliderText green;
    private a00720398.util.LabelSliderText red;
    // End of variables declaration
}Thanks,
Thufir