Re: Coordinating multiple JTextField updates across panels

This is slapped together and could have some threading issues

but it works to demonstrate the point.

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;

public class test extends JPanel implements Runnable {

    JTextField[] fields = new JTextField[1200];
    int n;
    Robot robot;
    BufferedImage bi;
    MyGlassPane mgp;

    public test() throws AWTException {
        setLayout(new GridLayout(30,40));

        for (int i=0; i<fields.length; i++) {
            fields[i] = new JTextField("000");
            add(fields[i]);
        }

        robot = new Robot();
        mgp = new MyGlassPane();
    }

    public void run() {
        while (true) {
            Point p = getLocationOnScreen();
            Rectangle r = new Rectangle(p.x,p.y,getWidth(),getHeight());
            bi = robot.createScreenCapture(r);
            mgp.repaint();
            mgp.setVisible(true);

            for (int i=0; i<fields.length; i++)
                fields[i].setText(Integer.toString(n));

            mgp.setVisible(false);

            ++n;
            try {
                Thread.sleep(1000);
            } catch (InterruptedException ie) {
                ie.printStackTrace();
            }
        }
    }

    class MyGlassPane extends JComponent {
        public void paintComponent(Graphics g) {
            g.drawImage(bi,0,0,null);
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    JFrame f = new JFrame();
                    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    test t = new test();
                    f.add(t,BorderLayout.CENTER);
                    f.setGlassPane(t.mgp);
                    f.pack();
                    f.setVisible(true);
                    new Thread(t).start();
                } catch (AWTException awte) {
                    awte.printStackTrace();
                }
            }
        });
    }
}