Evento do Teclado no JFrame

Programação Java
#21

Acho que acertei como usar os métodos “getInputMap()” e “getActionMap()” que a documentação recomenda. O exemplo abaixo funcionou para as teclas F1 e F2, F1 com esses dois métodos recomendados e F2 com o antigo.

/*
 * Created on 24/02/2004
 */
package br.pro.douglas.teste;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JRootPane;
import javax.swing.KeyStroke;

/**
 * @author Douglas Siviotti
 */
public class JFrameCaptureKeys extends JFrame implements ActionListener {
	public static void main(String[] args) {
		JFrameCaptureKeys app = new JFrameCaptureKeys();
		app.setVisible(true);
	}
	private final String commandF1 = "F1";
	private final String commandF2 = "F2";

	private javax.swing.JPanel jContentPane = null;
	private javax.swing.JTextField jTextField = null;
	private Action pressF1;
	/**
	 * This is the default constructor
	 */
	public JFrameCaptureKeys() {
		super();
		/* Cria uma Action para quando pressionar F1 */
		pressF1 = new AbstractAction(commandF1){
			public void actionPerformed(ActionEvent e) {
				System.out.println("F1 pressionado");
			}
		};
		/* Guarda a condição - sem isso não funciona */
		int cond = JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT;
		/* Cria KeyStrokes para F1 e F2 */
		KeyStroke f1 = KeyStroke.getKeyStroke(KeyEvent.VK_F1,0);
		KeyStroke f2 = KeyStroke.getKeyStroke(KeyEvent.VK_F2,0);
		/* Guarda o RootPane */
		JRootPane rootPane = getRootPane();
		/* Modo obsoleto */
		rootPane.registerKeyboardAction(this, commandF2, f2, cond);
		/* Modo recomendado */
		rootPane.getInputMap(cond).put(f1, commandF1);
		rootPane.getActionMap().put(commandF1, pressF1 );
		/* Inicialização da JFrame */	
		initialize();
	}
	
	public void actionPerformed(ActionEvent e) {
		String key = e.getActionCommand();
		if (key.equals(commandF2))
		  System.out.println("F2");
	}
	/**
	 * This method initializes jContentPane
	 * 
	 * @return javax.swing.JPanel
	 */
	private javax.swing.JPanel getJContentPane() {
		if (jContentPane == null) {
			jContentPane = new javax.swing.JPanel();
			jContentPane.setLayout(new java.awt.BorderLayout());
			jContentPane.add(getJTextField(), java.awt.BorderLayout.SOUTH);
		}
		return jContentPane;
	}
	/**
	 * This method initializes jTextField
	 * 
	 * @return javax.swing.JTextField
	 */
	private javax.swing.JTextField getJTextField() {
		if(jTextField == null) {
			jTextField = new javax.swing.JTextField();
		}
		return jTextField;
	}
	/**
	 * This method initializes this
	 * 
	 * @return void
	 */
	private void initialize() {
		this.pack();
		this.setSize(400, 300);
		this.setContentPane(getJContentPane());
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}
#22