SplitPane Demo 2
/* From http://java.sun.com/docs/books/tutorial/index.html */
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import java.awt.Dimension;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import java.util.StringTokenizer;
import java.util.Vector;
import javax.swing.ImageIcon;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class SplitPaneDemo2 extends JFrame implements ListSelectionListener {
private JLabel label;
public SplitPaneDemo2() {
super("SplitPaneDemo2");
//Create an instance of SplitPaneDemo
SplitPaneDemo splitPaneDemo = new SplitPaneDemo();
JSplitPane top = splitPaneDemo.getSplitPane();
splitPaneDemo.getImageList().addListSelectionListener(this);
//XXXX: Bug #4131528, borders on nested split panes accumulate.
//Workaround: Set the border on any split pane within
//another split pane to null. Components within nested split
//panes need to have their own border for this to work well.
top.setBorder(null);
//Create a regular old label
label = new JLabel("Click on an image name in the list.", JLabel.CENTER);
//Create a split pane and put "top" (a split pane)
//and JLabel instance in it.
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, top,
label);
splitPane.setOneTouchExpandable(true);
splitPane.setDividerLocation(180);
//Provide minimum sizes for the two components in the split pane
top.setMinimumSize(new Dimension(100, 50));
label.setMinimumSize(new Dimension(100, 30));
//Add the split pane to this frame
getContentPane().add(splitPane);
}
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting())
return;
JList theList = (JList) e.getSource();
if (theList.isSelectionEmpty()) {
label.setText("Nothing selected.");
} else {
int index = theList.getSelectedIndex();
label.setText("Selected image number " + index);
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new SplitPaneDemo2();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
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) {
handleMissingResource(e);
}
//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 = createImageIcon("images/"
+ (String) imageNames.firstElement());
if (firstImage != null) {
picture = new JLabel(firstImage);
} else {
picture = new JLabel((String) imageNames.firstElement());
}
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);
picture.setText(null);
} else {
int index = theList.getSelectedIndex();
ImageIcon newImage = createImageIcon("images/"
+ (String) imageNames.elementAt(index));
picture.setIcon(newImage);
if (newImage != null) {
picture.setText(null);
} else {
picture.setText("Image not found: "
+ (String) imageNames.elementAt(index));
}
}
}
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;
}
/** Called when the image property file can't be found. */
private void handleMissingResource(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();
throw (e); //Used to be exit(1), but that causes the console to
//go away under Java Web Start; this way, you're
//more likely to see a relevant error message.
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = SplitPaneDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("SplitPaneDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
SplitPaneDemo splitPaneDemo = new SplitPaneDemo();
frame.getContentPane().add(splitPaneDemo.getSplitPane());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
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