JSplitPane, focus and keybindings

Question

Just noticed that the JSplitPane is a bit crazy regarding its keybindings (example below)
- bindings are defined in When_Ancestor, that's the good part
- they only work if the splitpane itself is focused
This requires additional activity for the user: needs to press f8 (and know about that particular binding, me didn't until browsing the bug parade) to first focus, than move the divider
The culprit is BasicSplitPaneUI.Actions in collaboration with Handler:
// actionPerformed
  if (ui.dividerKeyboardResize) {
        // move the divider
// handler focusLost
  ui.dividerKeyboardResize = false;Any ideas how to make them work as expected (that is move the divider if focus somewhere in the child hierarchy, provided no child consumes it) - short of c&p the actions without that check?
Thanks
Jeanette
public class SplitPaneKeyBindings {
    private JComponent createContent(boolean focusable) {
        JButton button = new JButton("left");
        button.setFocusable(focusable);
        JButton other = new JButton("right");
        other.setFocusable(focusable);
        JSplitPane pane = new JSplitPane();
        pane.setLeftComponent(button);
        pane.setRightComponent(other);
        return pane;
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame("");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new SplitPaneKeyBindings().createContent(true));
                frame.setLocationRelativeTo(null);
                frame.setSize(400, 200);
                frame.setVisible(true);
}

Answer 1

You can (and should, I guess) use the component's input and action maps.
Kind regards,
  Levi