@Override
 public void propertyChange(PropertyChangeEvent evt) {
   String strPropertyName = evt.getPropertyName();
   if ("progress".equals(strPropertyName)) {
     progressBar.setIndeterminate(false);
     int progress = (Integer) evt.getNewValue();
     progressBar.setValue(progress);
   }
 }
  private static JComponent makeUI() {
    // final JProgressBar progressBar = new JProgressBar(SwingConstants.VERTICAL);
    final JProgressBar progressBar = new JProgressBar();
    progressBar.setOpaque(false);
    progressBar.setUI(new GradientPalletProgressBarUI());

    GridBagConstraints c = new GridBagConstraints();
    JPanel p = new JPanel(new GridBagLayout());
    p.setBorder(BorderFactory.createEmptyBorder(32, 8, 0, 8));

    c.gridheight = 1;
    c.gridwidth = 1;
    c.gridy = 0;

    c.gridx = 0;
    c.insets = new Insets(0, 0, 0, 4);
    c.weightx = 1d;
    c.fill = GridBagConstraints.HORIZONTAL;
    p.add(progressBar, c);

    c.gridx = 1;
    c.weightx = 0d;
    p.add(
        new JButton(
            new AbstractAction("Start") {
              @Override
              public void actionPerformed(ActionEvent e) {
                final JButton b = (JButton) e.getSource();
                b.setEnabled(false);
                SwingWorker<Void, Void> worker =
                    new Task() {
                      @Override
                      public void done() {
                        if (b.isDisplayable()) {
                          b.setEnabled(true);
                        }
                      }
                    };
                worker.addPropertyChangeListener(new ProgressListener(progressBar));
                worker.execute();
              }
            }),
        c);
    return p;
  }