Property Split : Splitpane « Swing JFC « Java

Property Split

Property Split

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;

public class PropertySplit {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Property Split");

    JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);

    JComponent topComponent = new OvalPanel();

    JComponent bottomComponent = new OvalPanel();

    PropertyChangeListener propertyChangeListener = new PropertyChangeListener() {
      public void propertyChange(PropertyChangeEvent changeEvent) {
        JSplitPane sourceSplitPane = (JSplitPane) changeEvent
        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);


    Container contentPane = frame.getContentPane();
    contentPane.add(splitPane, BorderLayout.CENTER);
    frame.setSize(300, 150);

class OvalPanel extends JPanel {

  Color color;

  public OvalPanel() {

  public OvalPanel(Color color) {
    this.color = color;

  public void paintComponent(Graphics g) {
    int width = getWidth();
    int height = getHeight();
    g.drawOval(0, 0, width, height);



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