Adding a Key Binding Globally (to an entire JFrame)

Question

Hi, all. I'm trying the ever-so-common task of adding a global key binding to my little Swing app. I just wrote a very basic image converter for an obscure multi-frame format and one of the users requested that I add a simple feature: when control-N is pressed, the a new document is created (just as if the user had selected New from the File menu).
I've read the Swing keybinding tutorial and I've tried to write a method to neatly contain the operation. The method is as follows:
    public static void setKeystrokeForAction(JFrame jframe, KeyStroke keystroke, Action action)
        jframe.getRootPane().getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(keystroke, action.getValue(Action.NAME));
        jframe.getRootPane().getActionMap().put(action.getValue(Action.NAME), action);
    }This doesn't seem to work. I was under the impression that this would somehow allow any component focused in the frame to respond to the specified KeyStroke (in this case, control-N) and react by executing the Action provided (in this case, an action which calls the new document method in my application). However, I press control-N with various focused components and nothing happens.
I know that the Action is sound because selecting the File : New item (which uses the same Action object) works just fine. The KeyStroke is constructed as follows:
KeyStroke.getKeyStroke(KeyEvent.VK_N, KeyEvent.CTRL_DOWN_MASK)What am I missing?
Thanks!

Answer 1

Don't know why its not working. Its works fine for me in this example:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=312780
Although the example uses WHEN_IN_FOCUSED_WINDOW I also tested it with WHEN_ANCESTOR... and it still worked fine.