Custom jtable editors

Question

Hi,
I've written an application which needs to use multiple editors for the same table. Also I've modified the keyboard navigation to create a new row for certain keystrokes like TAB and ENTER. For this I've attached a KeyListener to the JTable.
My problem is that though the editors work fine, but the keyevent dont arrive at my listener when I double click a cell to edit it. But if I were to select the cell and start typing, the keyeventListener works just fine.
Kindly do lemme know what I should be doing.
Thanks in advance.
KR.

Answer 1

First some notes:
1) don't use KeyListeners
2) don't use KeyListeners
3) don't use KeyListeners
got it? :-)
Your problem is that keyListeners only work on focused components - in the general case there's no way to predict which component will have the focus when the table is editing. Depends on both the JTable and the editor in use.
The high level and very powerful approach that replaces the veeeery low level keyListeners is the InputMap/ActionMap mechanism (if you are not familiar with it, read the article about keybindings that's somewhere at this site) - it's used internally by Swing as well and you can easily plug-into the internal default handling.
There is absolutely no reason for any tricks, the straightforward way to go is:
a) get the table's default action that's bound to the keyStroke you want to enhance (JTable has all registered keyStrokes in the inputMap of type WHEN_ANCESTOR_OF...)
Object actionKey = table.getInputMap(type).get(myKeyStroke);
Action action = table.getActionMap(actionKey);b) define a custom action that augments the default - depending on context, let it do its own work before/after calling the default
class CustomAction extends.... {
  Action delegate;
  void actionPerformed(...) {
    JTable table = (JTable) e.getSource();
    // check conditions
    // do work
    delegate.actionPerformed(e);
    // check conditions
    // do work;
}c) replace the custom action for the default action in the table's actionMap
table.getActionMap().put(actionKey, new CustomAction(action);Greetings
Jeanette