messagebox.java~15~

java编的PL/0词法编译器

package compiler;

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

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class MessageBox extends JDialog implements ActionListener{
  public static final int ONLY_YES=0;//仅有"确定"按钮
  public static final int ONLY_YES_NO=1;//仅有"是"和"否"按钮
  public static final int YES_NO_CANCEL=2;//有"是","否"和"取消"三个按钮
  public static final int YES=0;//用户回答"是"
  public static final int NO=1;//用户回答"否"
  public static final int CANCEL=3;//用户回答"取消"
  private int type;//记录显示类型
  private String message;//要显示的文字信息
  private int answer;//记录用户的回答

  JPanel contentPane= new JPanel();
  JPanel messagePane=new JPanel();
  JLabel messageLabel=new JLabel();//用于显示message
  JPanel buttonPane=new JPanel();//用于存放各个按钮
  JButton yesButton=new JButton();
  JButton noButton=new JButton();
  JButton cancelButton=new JButton();

  public MessageBox(Frame frame, String title,int type,String message) {
    super(frame, title,true);
    this.type=type;
    this.message=message;
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
      pack();
    }
    catch(Exception ex) {
      ex.printStackTrace();
    }
  }

  private void jbInit() throws Exception {
    contentPane=(JPanel)this.getContentPane();
    contentPane.setLayout(new BorderLayout());

    if(message.length()<25){
      int i=25-message.length();
      i/=2;
      for(int j=0;j<i;j++)
        message="  "+message;
      for(int j=0;j<i;j++)
        message=message+"  ";
    }else{
      message="     "+message+"     ";
    }

    messageLabel=new JLabel(message);
    messagePane.setLayout(new BorderLayout());
    messagePane.add(messageLabel,BorderLayout.CENTER);
    contentPane.add(messagePane,BorderLayout.CENTER);
    buttonPane.setLayout(new BorderLayout());
    switch(type){
      case ONLY_YES:
        yesButton=new JButton("确定");
        yesButton.addActionListener(this);
        buttonPane.add(yesButton,BorderLayout.CENTER);
        break;
      case YES_NO_CANCEL:
        cancelButton=new JButton("取消");
        cancelButton.addActionListener(this);
        buttonPane.add(cancelButton,BorderLayout.EAST);
      case ONLY_YES_NO:
        yesButton=new JButton("是 ");
        yesButton.addActionListener(this);
        buttonPane.add(yesButton,BorderLayout.WEST);
        noButton=new JButton("否 ");
        noButton.addActionListener(this);
        buttonPane.add(noButton,BorderLayout.CENTER);
        break;
    }
    contentPane.add(buttonPane,BorderLayout.SOUTH);
    this.pack();
    this.setResizable(false);
  }

  public void actionPerformed(ActionEvent e){

  }

  public int getAnswer(){
    return answer;
  }

  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      answer=CANCEL;
    }
    super.processWindowEvent(e);
  }

}