SplitPaneTest.java Source code

Introduction

Here is the source code for SplitPaneTest.java

Source

/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)
    
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
    
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
    
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import java.awt.BorderLayout;
import java.awt.EventQueue;

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.
 * @version 1.03 2007-08-01
 * @author Cay Horstmann
 */
public class SplitPaneTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                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 {
    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.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;
}