SplitPaneTest.java

package javademo.swing;

/**
 * Demo from <b>Core Java 2 Volume II - Advanced Features, 7th Edition</b>
 * 
 */

import java.awt.BorderLayout;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

/**
   This program demonstrates the split pane component
   organizer.
*/
public class SplitPaneTest
{
    public static void main(String[] args)
    {
        JFrame frame = new SplitPaneFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

/**
   This frame consists of two nested split panes to demonstrate
   planet images and data.
*/
class SplitPaneFrame extends JFrame
{
    private static final long serialVersionUID = -7216293790736267039L;
    
    public SplitPaneFrame()
    {
        setTitle("SplitPaneTest");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
        
        // set up components for planet names, images, descriptions
        final JList planetList = new JList(planets);
        final JLabel planetImage = new JLabel();
        final JTextArea planetDescription = new JTextArea();
        
        planetList.addListSelectionListener(new ListSelectionListener()
        {
            public void valueChanged(ListSelectionEvent event)
            {
                Planet value = (Planet)planetList.getSelectedValue();
                
                // update image and description
                planetImage.setIcon(value.getImage());
                planetDescription.setText(value.getDescription());
            }
        });
        
        // set up split panes
        JSplitPane innerPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, planetList, planetImage);
        innerPane.setDividerLocation(100);
        innerPane.setContinuousLayout(true);
        innerPane.setOneTouchExpandable(true);
        
        JSplitPane outerPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, innerPane, planetDescription);
        
        add(outerPane, BorderLayout.CENTER);
    }
    
    private Planet[] planets = { new Planet("Mercury", 2440, 0), new Planet("Venus", 6052, 0),
            new Planet("Earth", 6378, 1), new Planet("Mars", 3397, 2), new Planet("Jupiter", 71492, 16),
            new Planet("Saturn", 60268, 18), new Planet("Uranus", 25559, 17), new Planet("Neptune", 24766, 8),
            new Planet("Pluto", 1137, 1), };
    
    private static final int DEFAULT_WIDTH = 300;
    
    private static final int DEFAULT_HEIGHT = 300;
}

/**
   Describes a planet.
*/
class Planet
{
    /**
       Constructs a planet.
       @param n the planet name
       @param r the planet radius
       @param m the number of moons
    */
    public Planet(String n, double r, int m)
    {
        name = n;
        radius = r;
        moons = m;
        image = new ImageIcon(name + ".gif");
    }
    
    public String toString()
    {
        return name;
    }
    
    /**
       Gets a description of the planet.
       @return the description
    */
    public String getDescription()
    {
        return "Radius: " + radius + "\nMoons: " + moons + "\n";
    }
    
    /**
       Gets an image of the planet.
       @return the image
    */
    public ImageIcon getImage()
    {
        return image;
    }
    
    private String name;
    
    private double radius;
    
    private int moons;
    
    private ImageIcon image;
}