keyListener

From: Cippo741 (cippo741_at_inwind.it)
Date: 02/27/04 

Date: Fri, 27 Feb 2004 15:38:53 GMT

Hy to all, excuse my bad english.
 I'm trying to insert a keylistener such that, pressing whichever key during
the execution, show message dialog with the key pressed. I'm almost sure I
didn't understand. I added keylistener to frame.getContentPane(). Is that
right? and then I write frame.setContentPane(pannello). Am I loosing the
listener? Need I the focus? till now, I never saw message dialog :-).
suggestions? thanks. cippo741

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

public class Prova
{
    JButton Avanti = new JButton("Next");

    disegno destro = new disegno();
    disegno sinistro = new disegno();
    disegno centro = new disegno();

    JLabel Lista0=new JLabel("Now it's all ok, go on");
    JLabel Lista1=new JLabel("This is first line'");
    JLabel Lista2=new JLabel("This is second line");
    JLabel Lista3=new JLabel("This is third line");
    KeyListener kl = new KeyListener()
  {//KEYLISTENERRRRRRRR
   public void keyPressed(KeyEvent e)
   {
    JOptionPane.showMessageDialog(destro,
     "Pressed key "+ e.paramString(), "Information", JOptionPane.
     INFORMATION_MESSAGE);
   }
   public void keyReleased(KeyEvent e)
   {
    System.out.println("keyReleased" + e.paramString());
   }
   public void keyTyped(KeyEvent e)
   {
      System.out.println("keyTyped" + e.paramString());
   }
  };

    public void createAndShowGUI()
    {
        JFrame.setDefaultLookAndFeelDecorated(true);
        final JFrame frame = new JFrame();
        frame.setSize(800,600);

        WindowCloser listener=new WindowCloser();
        frame.addWindowListener(listener);
        WindowDeiconified listener2=new WindowDeiconified();
        frame.addWindowListener(listener2);

        JPanel pannello=new JPanel();
        pannello.setLayout(new GridBagLayout());

        GridBagConstraints c = new GridBagConstraints();
        c.weightx = 1;
        c.weighty = 1;
        c.fill = c.BOTH;

        frame.getContentPane().addKeyListener(kl);
  Avanti.addActionListener(new ActionListener()
  {
   public void actionPerformed(ActionEvent e)
   {
    JOptionPane.showMessageDialog(
    destro,
    "Welcome!!!",
    "Informazione",
    JOptionPane.INFORMATION_MESSAGE);

    destro.removeAll();
    centro.setLayout( new GridBagLayout() );
    GridBagConstraints c3 = new GridBagConstraints();
    c3.gridy++;
    centro.add(Lista1, c3);
    c3.gridy++;
    centro.add(Lista2, c3);
    c3.gridy++;
    centro.add(Lista3, c3);
    frame.validate();
    frame.repaint();
   }
  });

        sinistro.setBackground(Color.green);
        centro.setBackground(Color.white);
        destro.setBackground(Color.red);
        destro.add(Avanti);
        destro.add(Lista0);
        c.gridx++;
        pannello.add(sinistro,c);
        c.gridx++;
        pannello.add(centro,c);
        c.gridx++;
        pannello.add(destro,c);
        frame.setContentPane(pannello);
        frame.setVisible(true);
    }

    public static void main(String args[])
    {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(
   new Runnable()
     {
      public void run()
      {
       Prova ciccio = new Prova();
       ciccio.createAndShowGUI();
      }
     });
 }

    class disegno extends JPanel
    {

        public disegno()
        {
            setPreferredSize(new Dimension(250,500));
        }
    }

    private class WindowCloser extends WindowAdapter
    {
        public void windowClosing(WindowEvent event)
        {
            System.exit(0);
        }
    }

    private class WindowDeiconified extends WindowAdapter
    {
        public void windowDeiconified(WindowEvent e)
        {
            centro.repaint();
            System.out.println(this);
        }
    }
}

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