PropertyChangeListener for a JButton that contains a JPanel?

Question

I created a class that extends from the JButton class. The class contains a JPanel that adds two components to the panel, A JLabel that contains text and a JLabel that contains an icon. Therefore this class is really just a button that contains a JPanel with 2 JLabels added to the panel. (Reason for doing this is it adds layout control to add the 2 components to a panel instead of directly to the JButton) Normally you would do a changepropertylistener to the JButton but because I added the 2 components (JLabel) to a panel and then added the JPanel to the button, the button doesn't notice any change events. How would I detect the PropertyChangeEvent for this cenario?
thanks,
Peter Landis

Answer 1

The solution to the problem is when the instance of the class is created, do a getComponent(0) to get the JPanel component and the do a getComponent(0) to get the JLabel component. Now from here you can add a PropertyChangeListener to the JLabel that you just obtained. The PropertyChangeListener class will look like:
class RotorItemListener implements PropertyChangeListener
     public void propertyChange(PropertyChangeEvent e)
System.out.println("CHANGE");
String name = e.getPropertyName();
if(name == "text")
System.out.println("Label changed");
This will only trap a change that occurs when the label has changed. If you omit the if(name == "text") then when the component is created, a property change event will be triggered which is not what you want. This only traps event that occur only when a change has occurred on the JLabel. Notice that during the instantiation of the component you'll see the text displayed "CHANGE" and not the "Label changed" until the label text has changed.
Pretty cool huh!