import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.HierarchyEvent;
import java.awt.event.HierarchyListener;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JSplitPane;
public class MainClass {
public static void main(String args[]) throws Exception {
JFrame vFrame = new JFrame("Vertical Split");
vFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JComponent leftButton = new JButton("Left");
JComponent rightButton = new JButton("Right");
final JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
splitPane.setOneTouchExpandable(true);
splitPane.setLeftComponent(leftButton);
splitPane.setRightComponent(rightButton);
ActionListener oneActionListener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
splitPane.resetToPreferredSizes();
}
};
((JButton) rightButton).addActionListener(oneActionListener);
ActionListener anotherActionListener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
splitPane.setDividerLocation(10);
splitPane.setContinuousLayout(true);
}
};
((JButton) leftButton).addActionListener(anotherActionListener);
HierarchyListener hierarchyListener = new HierarchyListener() {
public void hierarchyChanged(HierarchyEvent e) {
long flags = e.getChangeFlags();
if ((flags & HierarchyEvent.SHOWING_CHANGED) == HierarchyEvent.SHOWING_CHANGED) {
splitPane.setDividerLocation(.75);
}
}
};
splitPane.addHierarchyListener(hierarchyListener);
vFrame.add(splitPane, BorderLayout.CENTER);
vFrame.setSize(300, 150);
vFrame.setVisible(true);
}
}