| 15. 15. 9. KeyboardFocusManager |
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Tab and Shift-Tab are used for keyboard focus traversal. |
To define your own traversal keys: replace or append to a key set via the setFocusTraversalKeys() method of Component. |
FORWARD_ TRAVERSAL_KEYS, BACKWARD_TRAVERSAL_KEYS, and UP_CYCLE_TRAVERSAL_KEYS constants of
KeyboardFocusManager are for forward, backward, and up-cycle. |
To add the 'A' key as an up-cycle key for a component |
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import java.awt.AWTKeyStroke;
import java.awt.KeyboardFocusManager;
import java.util.HashSet;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
public class KeyboardFocusManagerDemo {
public static void main(String[] args) {
JFrame aWindow = new JFrame("This is a Border Layout");
aWindow.setBounds(30, 30, 300, 300); // Size
aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel p = new JPanel();
p.add(new JTextField(10));
p.add(new JTextField(10));
p.add(new JTextField(10));
p.add(new JTextField(10));
p.add(new JTextField(10));
p.add(new JTextField(10));
Set<AWTKeyStroke> set = p.getFocusTraversalKeys(KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS);
set = new HashSet(set);
KeyStroke up = KeyStroke.getKeyStroke("A");
set.add(up);
System.out.println(set);
p.setFocusTraversalKeys(KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, set);
aWindow.add(p);
aWindow.setVisible(true); // Display the window
}
}
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