confirmdialog.java

Java程序设计技巧与开发实例附书源代码。

import java.awt.*;
import java.awt.event.*;

public class ConfirmDialog
    extends Dialog
    implements ActionListener {
  private Button okay = new Button("Okay");
  private Button cancel = new Button("Cancel");
  private Label label = new Label("Are you sure?", Label.CENTER);
  public boolean isOkay = false;

  // 其他域同前例
  private StopSign stop = new StopSign();

  private class WindowCloser
      extends WindowAdapter {
    public void windowClosing(WindowEvent we) {
      ConfirmDialog.this.isOkay = false;
      ConfirmDialog.this.hide();
    }
  }

  public ConfirmDialog(Frame parent) {
    this(parent, "Please confirm", "Are you sure?");
  }

  public ConfirmDialog(Frame parent, String title, String question) {
    super(parent, title, true);
    label.setText(question);
    setup();
    okay.addActionListener(this);
    cancel.addActionListener(this);
    addWindowListener(new WindowCloser());
    setResizable(false);
    pack();
    show();
  }

  private void setup() {
    Panel buttons = new Panel();
    buttons.setLayout(new FlowLayout());
    buttons.add(okay);
    buttons.add(cancel);
    setLayout(new BorderLayout());
    add("Center", label);
    add("South", buttons);
    add("West", stop); // 增加此行
  }

  public void actionPerformed(ActionEvent ae) {
    isOkay = (ae.getSource() == okay);
    hide();
  }
}