Re: KeyListener

From:
"tomaszewski.p" <ksswzza@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Tue, 19 Aug 2008 05:14:21 -0700 (PDT)
Message-ID:
<85425845-4ba4-432f-8882-ad34fcc11ec9@z72g2000hsb.googlegroups.com>
On 19 Sie, 12:47, Daniele Futtorovic <da.futt.n...@laposte.invalid>
wrote:

On 19/08/2008 09:41, Bum...@gmail.com allegedly wrote:

How add KeyListener to JFrame?
Simply I want that when I press F5 the content of JFrame refresh.


<code>
package scratch;

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

public class Scratch
{
     public static void main(String[] ss)
     throws Exception
     {
         EventQueue.invokeLater(new Runnable(){
             public void run(){
                 final JFrame f = new JFrame("InputMa=

pTest");

                 final Action a = new AbstractAction(=

"UNIQUE_ACTION_NAME"){

                     boolean dir = true;
                     public void actionPerformed(Ac=

tionEvent e) {

                         Component c = f.getC=

ontentPane();

                         dir ^= (c.getBackgro=

und().equals(Color.WHITE)

                                    =

 ||

c.getBackground().equals(Color.BLACK));

                         c.setBackground(dir ? =

c.getBackground().darker()

                                    =

         :

c.getBackground().brighter());

                         c.repaint();
                     }
                 };

                 f.setDefaultCloseOperation(JFrame.EXIT=

_ON_CLOSE);

                 f.setPreferredSize(new Dimension(400, =

400));

                 f.getRootPane().getInputMap().put(
                     KeyStroke.getKeyStroke(KeyEven=

t.VK_F5, 0),

                     a.getValue(Action.NAME)
                 );
                 f.getRootPane().getActionMap().put(
                     a.getValue(Action.NAME),
                     a
                 );

                 f.pack();
                 f.setLocationRelativeTo(null);
                 f.setVisible(true);
             }
         });
     }}

</code>

--
DF.


If it is not requirement to use input map, try to add
KeyListener (http://java.sun.com/javase/6/docs/api/java/awt/event/
KeyListener.html)
to JFrame (http://java.sun.com/javase/6/docs/api/java/awt/
Component.html#addKeyListener(java.awt.event.KeyListener))
and handle F5 by comparison of KeyEvent.VK_F5 with key code (http://
java.sun.com/javase/6/docs/api/java/awt/event/
KeyEvent.html#getKeyCode()) from key event.

Przemek

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