Interesting Focus II: JComboBox, 2 JLists and 1 Button

Question

Hi All,
Another Interesting Keyboard Focus Question:
What we want to do?
Let's say we want to build a JComboBox whose popup contains 2 JLists and a button.
What we would probably want to do is:
comboBox.setUI(new MyComboBoxUI());
MyComboBoxUI will extend BasicComboBoxUI and
ovveride createPopup to return a BasicComboPopup subclass
which will add the other JList and JButton.
(One can argue that this is not a JComboBox anymore, but bare with me)
Does it work?
This will work great with the Mouse, but with the Keyboard we face a problem:
After our popup is displayed, The JComboBox Still Has The Focus - Any UP or DOWN Events are really proccessed by the JComboBox which simulates JList navigation...
This is happening because the popup is not keyboard-focusable (and so do all of its components)
Where' s the problem?
We want to be able to:
1. Press TAB to navigate thru the 3 components
2. Press UP and DOWN to navigate the two JLists
3. Press Space to activate the JButton
Possible solutions:
1.
Don't subclass BasicComboPopup and write a ComboPopup which uses a Focusable JWindow.
Problem: The JComboBox will lose the focus when the popup opens
2.
Simulate all the DOWN/UP/TAB/SPACE events to the popup
Problem: The components are not focusable, hence there is no indication
of who is the current focused component
(Might be solved by surrounding the 'focused' component with a border)
Your thoughts?
If you haven't fell asleep by now, you are welcomed to share you ideas, Thanks
Eyal Katz

Answer 1

Sorry, I don't understand what you are trying to accomplish. However one line did catch my eye.
This is happening because the popup is not keyboard-focusable The code in the popupPopup() method in the following post might help:
http://forum.java.sun.com/thread.jspa?threadID=636842