JPanel visible rectangle area notification

ComponentListener does not work in my case. Consider a situation where the panel size is 1200x1200 and visible rectangle is 200x300 initially when split bar is moved Visble rectangle of the panel increase or decreases. In this case the panel size remains the same. sample code is given below

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.event.ComponentEvent;

import java.awt.event.ComponentListener;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JSplitPane;

public class VisibleRect extends JFrame{

private JPanel centerPanel = null;

private JSplitPane splitPane1 = null;

public VisibleRect() {

intiComp();

}

private void intiComp() {

centerPanel = new JPanel();

centerPanel.setBackground(Color.white);

centerPanel.setPreferredSize(new Dimension(1200, 1200));

centerPanel.addComponentListener(new ComponentListener() {

public void componentHidden(ComponentEvent e) {

System.out.println("componentHidden");

}

public void componentShown(ComponentEvent e) {

System.out.println("componentShown");

}

public void componentMoved(ComponentEvent e) {

System.out.println("componentMoved");

}

public void componentResized(ComponentEvent e) {

System.out.println("componentResized");

}

});

splitPane1 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, new JScrollPane(centerPanel), new JLabel());

add(splitPane1, BorderLayout.CENTER);

setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

setSize(200, 300);

setVisible(true);

}

/**

* @param args

*/

public static void main(String[] args) {

new VisibleRect();

}

}

Sarjaya at 2007-7-7 15:15:37 >