Re: Possible to have JList navigation keystrokes while JTextField has focus.

From:

Michael Rauscher <michlmann@gmx.de>

Newsgroups:

comp.lang.java.gui,comp.lang.java.programmer

Date:

Wed, 08 Jul 2009 00:31:36 +0200

Message-ID:

<h30icb$ds$01$1@news.t-online.com>

Daniel Pitts wrote:

I have a JTextField which the user can enter data, and this affects the
state of a JList.

I'd like the user to be able to type in the JTextField, but then press
the up-arrow or down-arrow to adjust the current selection.

What would be the best approach? I can listen for the up/down keystrokes
myself, and adjust the selection myself, but that seems to be a
short-cut hack that might lead to inconsistent behavior.

Is there another approach?

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Test {

     private void createAndShowGUI() {
         final JList list = new JList(new String[]{"A", "B", "C"});

         InputMap im =
                 list.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
         im.put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0),
                 "selectNextRow");
         im.put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0),
                 "selectPreviousRow");
         list.setInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW, im);

         JTextField textField = new JTextField(20);

         JFrame frame = new JFrame("Test");
         frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
         frame.add(new JScrollPane(list));
         frame.add(textField, BorderLayout.SOUTH);
         frame.pack();
         frame.setVisible(true);
     }

     public static final void main(String args[]) throws Exception {
         SwingUtilities.invokeLater(new Runnable() {
             public void run() {
                 new Test().createAndShowGUI();
             }
         });
     }
}

HTH
Michael