Source Code : ProgressBar Step

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ProgressBar Step

  
/*
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski     
ISBN: 1-893115-78-X
Publisher: APress
*/

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.reflect.InvocationTargetException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;

public class ProgressBarStep {
  static class BarThread extends Thread {
    private static int DELAY = 500;

    JProgressBar progressBar;

    public BarThread(JProgressBar bar) {
      progressBar = bar;
    }

    public void run() {
      int minimum = progressBar.getMinimum();
      int maximum = progressBar.getMaximum();
      Runnable runner = new Runnable() {
        public void run() {
          int value = progressBar.getValue();
          progressBar.setValue(value + 1);
        }
      };
      for (int i = minimum; i < maximum; i++) {
        try {
          SwingUtilities.invokeAndWait(runner);
          // our job for each step is to just sleep
          Thread.sleep(DELAY);
        } catch (InterruptedException ignoredException) {
        } catch (InvocationTargetException ignoredException) {
        }
      }
    }
  }

  public static void main(String args[]) {
    // Initialize
    final JProgressBar aJProgressBar = new JProgressBar(0, 50);
    aJProgressBar.setStringPainted(true);

    final JButton aJButton = new JButton("Start");

    ActionListener actionListener = new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        aJButton.setEnabled(false);
        Thread stepper = new BarThread(aJProgressBar);
        stepper.start();
      }
    };

    aJButton.addActionListener(actionListener);

    String title = (args.length == 0 ? "Stepping Progress" : args[0]);
    JFrame theFrame = new JFrame(title);
    theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    Container contentPane = theFrame.getContentPane();
    contentPane.add(aJProgressBar, BorderLayout.NORTH);
    contentPane.add(aJButton, BorderLayout.SOUTH);
    theFrame.setSize(300, 200);
    theFrame.setVisible(true);
  }
}

           
         
    
  

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