Question

I’m trying to write a nice GUI in Swing that uses the proper Model-Delegate pattern as much as possible. I have a JComboBox that when changed, needs to update the model with the new data. To get the currently selected item, I am using:

fooCombo.addItemListener(new ItemListener() {     public void itemStateChanged(final ItemEvent arg0) {         fooChangedHandler((Foo) fooModel.getSelectedItem());     } }); 

Which returns what the data was changed to as a nice Object. However, I can’t find a way to find out the old value, so I don’t know which object needs to be changed. Any ideas here?

Answer 1

ended up not going to the model at all but getting my object from the getItem method like so:

public void itemStateChanged(final ItemEvent event) {     if (event.getStateChange() == event.DESELECTED) {         deselectedFoo = (Foo) event.getItem();     }      else if (event.getStateChange() == event.SELECTED) {         FooChangedHandler(deselectedFoo,(Foo) event.getItem());     } }