Stepping through JList with up and down keys

Question

I am displaying a JList that contains file names, in a JScrollPane. I want to select files either by clicking on a line, or by using the up and down keys.

Using the mouse works fine, but if I select one line, then click "down" or "up", it skips one entry, and selects the next line but one. I thought maybe the key was bouncing, but there is only one key event per key stroke.

I keep adding traces to the code, but I just can't see my problem!

Do I need to do something with the ListModel? Help is much appreciated!

Answer 1

I just wanted to make sure this question is officially answered... Kleopatra pointed out that up and down keys are handled automatically, which explains why I was skipping entries. In addition, I added a ListSelectionListener (suggested by trashgod) to add some application-specific logic to the key handling. Thanks to both of you!

Answer 2

You might compare your approach to this working example that uses a ListSelectionListener. In particular check your use of getValueIsAdjusting(). Also verify that you do not interfere with the existing key bindings, and do not add an unecessary KeyListener. This variation is pictured below.