Esempio di inputMap-actionmap

Marco Ronchetti marco.ronchetti@unitn.it — Thu, 23 May 2013 15:53:00 +0200


package it.unitn.prog2.keybindingdemo;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import javax.swing.*;
/* Usare il tab per fare ciclare il focus tra le componenti */
public class KeyBindingDemo {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new KeyBindingDemo();
    }

    KeyBindingDemo() {
        JFrame f = new JFrame();
        f.setSize(400, 400);
        JPanel p = (JPanel) (f.getContentPane());
        p.setLayout(new BorderLayout());
        //====================================
        AbstractAction enterAction = new AbstractAction() {
            public void actionPerformed(ActionEvent tf) {
                System.out.println("The Enter key has been pressed in "+tf.getSource().getClass().toString());

            }
        };
        //====================================
        AbstractAction enterAction2 = new AbstractAction() {
            public void actionPerformed(ActionEvent tf) {
                System.out.println("The Enter key has been pressed on the yellow panel ");

            }
        };
        p.getInputMap().put(KeyStroke.getKeyStroke("ENTER"), "doEnterAction");
        p.getActionMap().put("doEnterAction", enterAction);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JButton b=new JButton();
        b.getInputMap().put(KeyStroke.getKeyStroke("ENTER"), "doEnterAction");
        b.getActionMap().put("doEnterAction", enterAction);
        p.add(b,BorderLayout.NORTH);
        //--------------------
        JPanel ip=new JPanel();
        ip.setBackground(Color.yellow);
        ip.getInputMap().put(KeyStroke.getKeyStroke("ENTER"), "doEnterAction");
        ip.getActionMap().put("doEnterAction", enterAction2);
        p.add(ip,BorderLayout.CENTER);
        //--------------------
        JTextField tf=new JTextField();
        p.add(tf,BorderLayout.SOUTH);
        tf.getInputMap().put(KeyStroke.getKeyStroke("ENTER"), "doEnterAction");
        tf.getActionMap().put("doEnterAction", enterAction);
        f.setVisible(true);
    }
}

Esempio di keylistener

Marco Ronchetti marco.ronchetti@unitn.it — Thu, 23 May 2013 15:57:00 +0200


class MyPanel extends JPanel implements KeyListener {
    private char c = 'e';

    public MyPanel() {
        this.setPreferredSize(new Dimension(500, 500));
        addKeyListener(this);
    }

    public void addNotify() {
        super.addNotify();
        requestFocus();
    }

    public void paintComponent(Graphics g) {
        g.clearRect(0, 0, getWidth(), getHeight());
        g.drawString("the key that pressed is " + c, 250, 250);
    }

    public void keyPressed(KeyEvent e) { }
    public void keyReleased(KeyEvent e) { }
    public void keyTyped(KeyEvent e) {
        c = e.getKeyChar();
        repaint();
    }

    public static void main(String[] s) {
        JFrame f = new JFrame();
        f.getContentPane().add(new MyPanel());
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.pack();
        f.setVisible(true);
    }
}

tratto da stackoverflow

Programmazione 2 - a.a.2012/13 > Esempi > Intercettazione tasti

Esempio di inputMap-actionmap

Esempio di keylistener