KeyboardFocusManager : Focus « Swing Event « Java Tutorial

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Java Tutorial » Swing Event » Focus 
15. 13. 9. KeyboardFocusManager

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

KeyboardFocusManager
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
  }
}
15. 13. Focus
15. 13. 1. No Focus Button
15. 13. 2. Focus auto-settingFocus auto-setting
15. 13. 3. Focus Traversal: requestFocusInWindowFocus Traversal: requestFocusInWindow
15. 13. 4. Moving focus to the next component: focusNextComponent()Moving focus to the next component: focusNextComponent()
15. 13. 5. Restricting the Focus CycleRestricting the Focus Cycle
15. 13. 6. Request Focus inside a windowRequest Focus inside a window
15. 13. 7. Predefined Focus Traversal Policies
15. 13. 8. Reversing Focus TraversalReversing Focus Traversal
15. 13. 9. KeyboardFocusManagerKeyboardFocusManager
15. 13. 10. Use KeyboardFocusManagerUse KeyboardFocusManager
15. 13. 11. Use FocusTraversalPolicy
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