Advanced Swing Containers - The Definitive Guide to Java Swing - page 383

Chapter 4), drawn to fill the dimensions of the component. This component helps to demon-
strate the effect of having the continuousLayout property set to true .
Listing 11-2. Listening for JSplitPane Property Changes
import javax.swing.*;
import java.awt.*;
import java.beans.*;
public class PropertySplit {
public static void main(String args[]) {
Runnable runner = new Runnable() {
public void run() {
JFrame frame = new JFrame("Property Split");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create/configure split pane
JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
splitPane.setContinuousLayout(true);
splitPane.setOneTouchExpandable(true);
// Create top component
JComponent topComponent = new OvalPanel();
splitPane.setTopComponent(topComponent);
// Create bottom component
JComponent bottomComponent = new OvalPanel();
splitPane.setBottomComponent(bottomComponent);
// Create PropertyChangeListener
PropertyChangeListener propertyChangeListener =
new PropertyChangeListener() {
public void propertyChange (PropertyChangeEvent changeEvent) {
JSplitPane sourceSplitPane = (JSplitPane)changeEvent.getSource();
String propertyName = changeEvent.getPropertyName();
if (propertyName.equals(
JSplitPane.LAST_DIVIDER_LOCATION_PROPERTY)) {
int current = sourceSplitPane.getDividerLocation();
System.out.println ("Current: " + current);
Integer last = (Integer)changeEvent.getNewValue();
System.out.println ("Last: " + last);
Integer priorLast = (Integer)changeEvent.getOldValue();
System.out.println ("Prior last: " + priorLast);
}
}
};