Question

I am trying to write a PropertyChange Listener which detects whether a JButton has an ImageIcon or not.

"icon" is a beans property but I can’t seem to add iconListener or something equivalent to the PropertyChangeListener.

Is there really no specific listener for icons ?

From the Oracle tutorial : “Property-change events occur whenever the value of a bound property changes for a bean ??? a component that conforms to the JavaBeans™ specification.”

buttonArray[a].addChangeListener("icon",new iconListener()); // doesn't work

buttonArray[a].addChangeListener("icon", new ImageIconListener()); // doesn't work

Answer 1

Nothing special to the icon property, it’s just a … property 🙂 So you need a custom PropertyChangeListener and register it with the button

PropertyChangeListener myListener = new PropertyChangeListener() .... {

};
// register to be only notified if the _icon_ property changes
button.addPropertyChangeListener("icon", myListener);