FileDocCategorySizeDatePackage
ProgressBarDemo.javaAPI DocExample2690Tue Dec 12 18:59:18 GMT 2000None

ProgressBarDemo

public class ProgressBarDemo extends JFrame

Fields Summary
public static final int
ONE_SECOND
private JProgressBar
progressBar
private Timer
timer
private JButton
startButton
private LongTask
task
private JTextArea
taskOutput
private String
newline
Constructors Summary
public ProgressBarDemo()


      
        super("ProgressBarDemo");
        task = new LongTask();

        //Create the demo's UI.
        startButton = new JButton("Start");
        startButton.setActionCommand("start");
        startButton.addActionListener(new ButtonListener());

        progressBar = new JProgressBar(0, task.getLengthOfTask());
        progressBar.setValue(0);
        progressBar.setStringPainted(true);

        taskOutput = new JTextArea(5, 20);
        taskOutput.setMargin(new Insets(5,5,5,5));
        taskOutput.setEditable(false);

        JPanel panel = new JPanel();
        panel.add(startButton);
        panel.add(progressBar);

        JPanel contentPane = new JPanel();
        contentPane.setLayout(new BorderLayout());
        contentPane.add(panel, BorderLayout.NORTH);
        contentPane.add(new JScrollPane(taskOutput), BorderLayout.CENTER);
        contentPane.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
        setContentPane(contentPane);

        //Create a timer.
        timer = new Timer(ONE_SECOND, new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                progressBar.setValue(task.getCurrent());
                taskOutput.append(task.getMessage() + newline);
                taskOutput.setCaretPosition(
                        taskOutput.getDocument().getLength());
                if (task.done()) {
                    Toolkit.getDefaultToolkit().beep();
                    timer.stop();
                    startButton.setEnabled(true);
                    progressBar.setValue(progressBar.getMinimum());
                }
            }
        });
Methods Summary
public static voidmain(java.lang.String[] args)

        JFrame frame = new ProgressBarDemo();
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        frame.pack();
        frame.setVisible(true);