java left logo
java middle logo
java right logo
 

Home arrow Java SE Tips
 
 
Main Menu
Home
Java Tutorials
Book Reviews
Java SE Tips
Java ME Tips
Java EE Tips
Other API Tips
Java Applications
Java Libraries
Java Games
Java Network
Java Forums
Java Blog




Most Visited Tips
Java SE Tips
Java ME Tips
Java EE Tips
Other API Tips
Java Applications
Java Libraries
Java Games
Book Reviews
Top Rated Tips
Java SE Tips
Java ME Tips
Java EE Tips
Other API Tips
Java Applications
Java Libraries
Java Games
Book Reviews


Statistics
Registered Users: 3936
Java SE Tips: 614
Java ME Tips: 202
Java EE Tips: 183
Other API Tips: 779
Java Applications: 298
Java Libraries: 209
Java Games: 16
Book Reviews:
 
 
 
How to implement a graphical list selection monitor E-mail
User Rating: / 7
PoorBest 
graphical list selection monitor

This Java Swing tip illustrates a method of implementing a graphical list selection monitor. This includes a listener that responds to the events and correspondingly updates the buttons.

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

public class SelectionMonitor extends JPanel {
    
    String label[] "Zero","One","Two","Three","Four","Five","Six",
    "Seven","Eight","Nine","Ten","Eleven","Twelve" };
    
    JCheckBox checks[] new JCheckBox[label.length];
    JList list;
    
    public SelectionMonitor() {
        
        setLayout(new BorderLayout());
        
        list = new JList(label);
        JScrollPane pane = new JScrollPane(list);
        
        //  Format the list and the buttons in a vertical box
        Box rightBox = new Box(BoxLayout.Y_AXIS);
        Box leftBox = new Box(BoxLayout.Y_AXIS);
        
        //  Monitor all list selections
        list.addListSelectionListener(new RadioUpdater());
        
        for(int i=0; i < label.length; i++) {
            checks[inew JCheckBox("Selection " + i);
            checks[i].setEnabled(false);
            rightBox.add(checks[i]);
        }
        
        leftBox.add(pane);
        add(rightBox, BorderLayout.EAST);
        add(leftBox, BorderLayout.WEST);
    }
    
    public static void main(String s[]) {
        
        JFrame frame = new JFrame("Selection Monitor");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new SelectionMonitor());
        frame.pack();
        frame.setVisible(true);
        
    }
    
    // Inner class that responds to selection events to update the buttons
    class RadioUpdater implements ListSelectionListener {
        
        public void valueChanged(ListSelectionEvent e) {
            //  If either of these are true, the event can be ignored.
            if ((!e.getValueIsAdjusting()) || (e.getFirstIndex() == -1))
                return;
            
            //  Change the radio button to match the current selection state
            //  for each list item that reported a change.
            for (int i = e.getFirstIndex(); i <= e.getLastIndex(); i++) {
                checks[i].setSelected(
                        ((JList)e.getSource()).isSelectedIndex(i));
            }
        }
    }
}


 Related Tips

 
< Prev   Next >

Page 1 of 0 ( 0 comments )

You can share your information about this topic using the form below!

Please do not post your questions with this form! Thanks.


Name (required)


E-Mail (required)

Your email will not be displayed on the site - only to our administrator
Homepage(optional)



Comment Enable HTML code : Yes No



 
       
         
     
 
 
 
   
 
 
java bottom left
java bottom middle
java bottom right
RSS 0.91 FeedRSS 1.0 FeedRSS 2.0 FeedATOM FeedOPML Feed

Home - About Us - Privacy Policy
Copyright 2005 - 2008 www.java-tips.org
Java is a trademark of Sun Microsystems, Inc.