Re: Coordinating multiple JTextField updates across panels

Knute Johnson wrote:


Yes. In the meantime I tried it on a slower computer.

I thought that the paint events will be coalesced but this isn't the
case. So, to speed up painting one needs to mark the components clean
and afterwards repaint the root pane, see the actionPerformed method below:

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

public class teste extends JFrame implements ActionListener {
    JTextField[] fields = new JTextField[1000];
    int n;
    Timer timer = new Timer(200,this);

    public teste() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new GridLayout(25,40));

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

        pack();
        setVisible(true);
    }

    public void actionPerformed(ActionEvent ae) {
        RepaintManager mgr = RepaintManager.currentManager(
                getRootPane());

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

        getRootPane().repaint();

        ++n;
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                teste te = new teste();
                te.timer.start();
            }
        });
    }
}

Bye
Michael