import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
//SplitPaneDemo itself is not a visible component.
public class SplitPaneDemo implements ListSelectionListener {
private Vector imageNames;
private JLabel picture;
private JList list;
private JSplitPane splitPane;
public SplitPaneDemo() {
//Read image names from a properties file
ResourceBundle imageResource;
try {
imageResource = ResourceBundle.getBundle("imagenames");
String imageNamesString = imageResource.getString("images");
imageNames = parseList(imageNamesString);
} catch (MissingResourceException e) {
System.err.println();
System.err.println("Can't find the properties file " +
"that contains the image names.");
System.err.println("Its name should be imagenames.properties, " +
"and it should");
System.err.println("contain a single line that specifies " +
"one or more image");
System.err.println("files to be found in a directory " +
"named images. Example:");
System.err.println();
System.err.println(" images=Bird.gif Cat.gif Dog.gif");
System.err.println();
System.exit(1);
}
//Create the list of images and put it in a scroll pane
list = new JList(imageNames);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setSelectedIndex(0);
list.addListSelectionListener(this);
JScrollPane listScrollPane = new JScrollPane(list);
//Set up the picture label and put it in a scroll pane
ImageIcon firstImage = new ImageIcon("images/" +
(String)imageNames.firstElement());
picture = new JLabel(firstImage);
picture.setPreferredSize(new Dimension(firstImage.getIconWidth(),
firstImage.getIconHeight()));
JScrollPane pictureScrollPane = new JScrollPane(picture);
//Create a split pane with the two scroll panes in it
splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
listScrollPane, pictureScrollPane);
splitPane.setOneTouchExpandable(true);
splitPane.setDividerLocation(150);
//Provide minimum sizes for the two components in the split pane
Dimension minimumSize = new Dimension(100, 50);
listScrollPane.setMinimumSize(minimumSize);
pictureScrollPane.setMinimumSize(minimumSize);
//Provide a preferred size for the split pane
splitPane.setPreferredSize(new Dimension(400, 200));
}
//Used by SplitPaneDemo2
public JList getImageList() {
return list;
}
public JSplitPane getSplitPane() {
return splitPane;
}
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting())
return;
JList theList = (JList)e.getSource();
if (theList.isSelectionEmpty()) {
picture.setIcon(null);
} else {
int index = theList.getSelectedIndex();
ImageIcon newImage = new ImageIcon("images/" +
(String)imageNames.elementAt(index));
picture.setIcon(newImage);
picture.setPreferredSize(new Dimension(newImage.getIconWidth(),
newImage.getIconHeight() ));
picture.revalidate();
}
}
protected static Vector parseList(String theStringList) {
Vector v = new Vector(10);
StringTokenizer tokenizer = new StringTokenizer(theStringList, " ");
while (tokenizer.hasMoreTokens()) {
String image = tokenizer.nextToken();
v.addElement(image);
}
return v;
}
public static void main(String s[]) {
JFrame frame = new JFrame("SplitPaneDemo");
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
SplitPaneDemo splitPaneDemo = new SplitPaneDemo();
frame.getContentPane().add(splitPaneDemo.getSplitPane());
frame.pack();
frame.setVisible(true);
}
}
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