Re: Coordinating multiple JTextField updates across panels

From:

Michael Rauscher <michlmann@gmx.de>

Newsgroups:

comp.lang.java.gui

Date:

Tue, 16 Jun 2009 05:02:13 +0200

Message-ID:

<h171vm$tml$01$1@news.t-online.com>

Knute Johnson wrote:

Michael Rauscher wrote:

Jarrick Chagma wrote:

Is there a way to somehow coordinate these updates perhaps by
turning off
screen redraw until all fields in all panels have updated?

I don't know of such a way.

Yes, I figured as much but maybe someone can suggest a way?

Update them on the EDT.

Bye
Michael

That's even worse (on my computer anyway).

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