Re: Combobox how to disable edit but allow select

From:

"John_Woo" <john_woo@canada.com>

Newsgroups:

comp.lang.java.programmer

Date:

28 Sep 2006 12:40:12 -0700

Message-ID:

<1159472411.508732.122150@m7g2000cwm.googlegroups.com>

Michael Rauscher wrote:

John_Woo schrieb:

dnasmars@gmail.com wrote:

try this

public class MyComboBox extends JComboBox implements ActionListener {
public MyComboBox() {
addItem("a");

>> addItem("b");

                addItem("c");
                setEditable( false );
                addActionListener( this); //line A
    }

    public void actionPerformed(ActionEvent e) {
        System.out.println(" this is ugly ");
        this.setForeground(Color.white);
    }
}

I hope this helps

That's it! Thank you.

Color.black is better.

I don't know what you're doing but I know it must be something strange ;)

Michael's example (using an static inner class ) is fine, just didn't
understand why for standalone class, we have to explixitly set the
foreend color.

You do *not* need to. It doesn't make any difference if one uses a
static inner class or a top level class:

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

     class MyComboBox extends JComboBox implements ActionListener {
         public void actionPerformed( ActionEvent e ) {
             System.out.println( "Action" );
         }

         public MyComboBox() {
             addItem("a");
             addItem("b");
             addItem("c");
             setEditable( false );
             addActionListener( this );
         }
     }

public class Test {
     public static final void main( String args[] ) throws Exception {
         JFrame frame = new JFrame("Test");
         frame.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
         frame.setContentPane( new MyComboBox() );
         frame.pack();
         frame.setVisible( true );
     }
}

Thanks Michael,
if MyComboBox is as following (without overwrite actionPerformed
method)

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

public class Test {
     public static final void main( String args[] ) throws Exception {
         JFrame frame = new JFrame("Test");
         frame.setDefaultCloseOperation( JFrame.DISPOSE_ON_CLOSE );
         MyComboBox my = new MyComboBox();
         frame.setContentPane( my );
         frame.pack();
         frame.setVisible( true );
     }

}

class MyComboBox extends JComboBox implements ActionListener
{
        MyComboBox()
        {
                addItem("a");
                addItem("b");
                addItem("c");
                setEditable( false );
                addActionListener( this); //line A
        }

}
then once selecting an item, the field always displays blank. I still
have no idea about it.

John

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