import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Random;
import javax.swing.JOptionPane;
import javax.swing.SwingWorker;

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

/*
 * ProgressBarDemo.java
 *
 * Created on Jul 10, 2010, 11:35:31 PM
 */

/**
 *
 * @author Wilson Leong
 */
public class ProgressBarDemo extends javax.swing.JFrame {

    class Task extends SwingWorker<Void,Void>{
        public Void doInBackground(){
            int progress = 0;
            Random random = new Random();
            setProgress(0);
            jtaList.setText("");
            while(progress < 100){
                try{
                    Thread.sleep(random.nextInt(1000));
                }
                catch(InterruptedException ex){
                }
                progress += (Integer)random.nextInt(10);
                setProgress(Math.min(progress,100));
                jtaList.append(String.format("%d%% complete.", progress) + "\n");
            }  
            JOptionPane.showMessageDialog(null, "The loading is complete.", "Complete", JOptionPane.INFORMATION_MESSAGE);
            jbtOk.setEnabled(true);
            
            return null;
        }
    }
    /** Creates new form ProgressBarDemo */
    public ProgressBarDemo() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jpbProgressBar = new javax.swing.JProgressBar();
        jbtOk = new java.awt.Button();
        jScrollPane1 = new javax.swing.JScrollPane();
        jtaList = new javax.swing.JTextArea();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("JProgressBarDemo");

        jbtOk.setLabel("Ok");
        jbtOk.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jbtOkActionPerformed(evt);
            }
        });

        jtaList.setColumns(20);
        jtaList.setEditable(false);
        jtaList.setRows(5);
        jScrollPane1.setViewportView(jtaList);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(82, 82, 82)
                        .addComponent(jbtOk, javax.swing.GroupLayout.PREFERRED_SIZE, 54, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jpbProgressBar, javax.swing.GroupLayout.PREFERRED_SIZE, 207, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 207, Short.MAX_VALUE)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jpbProgressBar, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jbtOk, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void jbtOkActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jbtOkActionPerformed
        jpbProgressBar.setStringPainted(true);
        task = new Task();
        task.addPropertyChangeListener(new PropertyChangeListener(){
            public void propertyChange(PropertyChangeEvent e){
                if("progress".equals(e.getPropertyName())){
                    jbtOk.setEnabled(false);
                    int progress = (Integer)e.getNewValue();
                    jpbProgressBar.setValue(progress);
                }
            }
        });
        task.execute();
    }//GEN-LAST:event_jbtOkActionPerformed

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new ProgressBarDemo().setVisible(true);
            }
        });
    }
    private Task task;
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JScrollPane jScrollPane1;
    private java.awt.Button jbtOk;
    private javax.swing.JProgressBar jpbProgressBar;
    private javax.swing.JTextArea jtaList;
    // End of variables declaration//GEN-END:variables

}