progressmonitordemo.java

通讯采集软件

package collector.gui.test;

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

/*
 * ProgressMonitorDemo.java is a 1.4 application that requires these files:
 *   LongTask.java
 *   SwingWorker.java
 */
public class ProgressMonitorDemo
    extends JPanel
    implements ActionListener {
  public final static int ONE_SECOND = 1000;

  private ProgressMonitor progressMonitor;
  private Timer timer;
  private JButton startButton;
  private LongTask task;
  private JTextArea taskOutput;
  private String newline = "\n";

  public ProgressMonitorDemo() {
    super(new BorderLayout());
    task = new LongTask();

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

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

    add(startButton, BorderLayout.PAGE_START);
    add(new JScrollPane(taskOutput), BorderLayout.CENTER);
    setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));

    //Create a timer.
    timer = new Timer(ONE_SECOND, new TimerListener());
  }

  /**
   * The actionPerformed method in this class
   * is called each time the Timer "goes off".
   */
  class TimerListener
      implements ActionListener {
    public void actionPerformed(ActionEvent evt) {
      progressMonitor.setProgress(task.getCurrent());
      String s = task.getMessage();
      if (s != null) {
        progressMonitor.setNote(s);
        taskOutput.append(s + newline);
        taskOutput.setCaretPosition(
            taskOutput.getDocument().getLength());
      }
      if (progressMonitor.isCanceled() || task.isDone()) {
        progressMonitor.close();
        task.stop();
        Toolkit.getDefaultToolkit().beep();
        timer.stop();
        if (task.isDone()) {
          taskOutput.append("Task completed." + newline);
        }
        else {
          taskOutput.append("Task canceled." + newline);

        }
        startButton.setEnabled(true);
      }
    }
  }

  /**
   * Called when the user presses the start button.
   */
  public void actionPerformed(ActionEvent evt) {
    progressMonitor = new ProgressMonitor(ProgressMonitorDemo.this,
                                          "Running a Long Task",
                                          "", 0, task.getLengthOfTask());
    progressMonitor.setProgress(0);
    progressMonitor.setMillisToDecideToPopup(2 * ONE_SECOND);

    startButton.setEnabled(false);
    task.go();
    timer.start();
  }

  public static void main(String[] args) {
    //Make sure we have nice window decorations.
    JFrame.setDefaultLookAndFeelDecorated(true);
    JDialog.setDefaultLookAndFeelDecorated(true);

    //Create and set up the window.
    JFrame frame = new JFrame("ProgressMonitorDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Create and set up the content pane.
    JComponent newContentPane = new ProgressMonitorDemo();
    newContentPane.setOpaque(true); //content panes must be opaque
    frame.setContentPane(newContentPane);

    //Display the window.
    frame.pack();
    frame.setVisible(true);
  }
}