Re: Coordinating multiple JTextField updates across panels

Jarrick Chagma wrote:


I put 100 JTextFields each in it's own panel, plus some more panels and
containers for formatting, and I don't see any slowness. You might, and
maybe your needs are more sensitive than what I did, but this seems to
update fine for me.

/*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */

package fubar;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

/**
  *
  * @author Brenden
  */
public class UpdateTest {

     private static final int ROWS = 20;
     private static final int COLS = 5;

     private final List<JTextField> textFieldList =
             new ArrayList<JTextField>( ROWS * COLS );

     public static void main(String[] args) {

         SwingUtilities.invokeLater( new Runnable() {
             @Override
             public void run() {
                 new UpdateTest().createAndShowGui();
             }
         } );
     }

     private void createAndShowGui() {
         JFrame jframe = new JFrame("Update Test");
         Box centralContent = new Box( BoxLayout.PAGE_AXIS );
         for( int rows = 0; rows < ROWS; rows++ ) {
             JPanel rowPanel = new JPanel();
             for( int cols = 0; cols < COLS; cols ++ ) {
                 JTextField textField = new JTextField( 10 );
                 textFieldList.add( textField );
                 rowPanel.add( new JPanel().add( textField ) );
             }
             centralContent.add( rowPanel );
         }
         jframe.add( centralContent );
         JButton jbut = new JButton( "Update Now" );
         jbut.addActionListener( new UpdateListener() );
         JPanel bottom = new JPanel();
         LayoutManager layout = new FlowLayout( FlowLayout.CENTER );
         bottom.setLayout(layout);
         bottom.add( jbut );
         jframe.add( bottom, BorderLayout.SOUTH );
         jframe.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
         jframe.pack();
         jframe.setLocationRelativeTo( null );
         jframe.setVisible( true );
     }

     private class UpdateListener implements ActionListener {
         private int count = 1;
         @Override
         public void actionPerformed(ActionEvent e) {
             String update = "Update" + count;
             for (JTextField t : textFieldList ) {
                 t.setText( update );
             }
             count++;
         }
     }
}