getting the cancel event of Java ProgressMonitor

Question

I have a ProgressMonitor pm and a SwingWorker sw. I want to cancel the SwingWorker when I press the cancel-button on pm.

Answer 1

During the execution of your long running task, you want to periodically check if the ProgressMonitor was canceled. It's your job to check that at points where it makes sense to cancel the task - otherwise who knows what resources you could leave hanging.

So basically, you want to change your doSomethingAndUpdateProgress() method so that it also checks if the ProgressMonitor was canceled.

Here's a demo that shows how this works:

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

public class TempProject extends Box{

    public TempProject(){
        super(BoxLayout.Y_AXIS);
        final ProgressMonitor pm = new ProgressMonitor(this, "checking", "...", 0, 100);
        final SwingWorker sw = new SwingWorker()
        {
            protected Integer doInBackground() throws Exception 
            {
                int i = 0;
                //While still doing work and progress  monitor wasn't canceled
                 while (i++ < 100 && !pm.isCanceled()) {
                     System.out.println(i);
                     publish(i);
                     Thread.sleep(100);
                 }
                 return null;
            }


             @Override
             protected void process(java.util.List chunks) {
                 for (int number : chunks) {
                     pm.setProgress(number);
                 }
             }

        };

        sw.execute();
    }


    public static void main(String args[])
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
                frame.setContentPane(new TempProject());    
                frame.pack();
                frame.setVisible(true);
            }
        });
    }   


}