import java.awt.*;
import java.awt.event.*;
public class TestDialog implements ActionListener{
    private Label info;
    private Dialog loginDialog;
    private Dialog quitDialog;
    private TextField tf_name;
    private TextField tf_psw;
    public static void main( String args[]) {
        new TestDialog().init();
    }
    
    public void init(){
        Frame f = new Frame("注册窗口");
        Button login = new Button("登录");
        Button regist = new Button("注册");
        Button help = new Button("帮助");
        Button exit = new Button("退出");
        Panel p = new Panel();
        p.setLayout(new GridLayout(1,4));        
        p.add(login);
        p.add(regist);
        p.add(help);
        p.add(exit);
        info = new Label("您尚未登录");
        f.add(p,"North");        
        f.add(info,"Center");
        
        login.addActionListener(this);
        exit.addActionListener(this);
        f.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                TestDialog.this.quit();    
            }    
        });  
        f.setSize(200,150);
        f.setLocation(450,200);
        f.setVisible( true);
        loginDialog = this.createLoginDialog(f);
        quitDialog = this.createQuitDialog(f);
    }
    
    public Dialog createLoginDialog(Frame f){
        Dialog d = new Dialog(f,"登录对话框",true);
        Label note = new Label("请输入注册信息");
        
        Panel pa = new Panel();
        pa.setLayout(new GridLayout(2,1));
        pa.add(new Label("用户名:"));        
        pa.add(new Label("密  码:"));    
        
        Panel pc = new Panel();    
        pc.setLayout(new GridLayout(2,1));
        tf_name = new TextField();
        tf_psw = new TextField();
        tf_psw.setEchoChar('*');
        pc.add(tf_name);        
        pc.add(tf_psw);        
        
        Panel pb = new Panel();
        pb.setLayout(new GridLayout(1,2));
        Button submit = new Button("提交");    
        Button cancel = new Button("取消");    
        submit.setActionCommand("submitLogin");
        cancel.setActionCommand("cancelLogin");
        submit.addActionListener(this);
        cancel.addActionListener(this);
        pb.add(submit);
        pb.add(cancel);
        
        d.add(note,"North");
        d.add(pa,"West");
        d.add(pc,"Center");
        d.add(pb,"South");
        d.setSize(160,120);
        d.setLocation(400,200);        
        return d;
    }
    
    public Dialog createQuitDialog(Frame f){
        Dialog d = new Dialog(f,"确认退出对话框",true);
        Label note = new Label("您确定要退出程序吗？");
        Panel p = new Panel();
        //p.setLayout(new GridLayout(1,2));
        Button confirm = new Button("确定");    
        Button cancel = new Button("取消");    
        confirm.setActionCommand("confirmQuit");
        cancel.setActionCommand("cancelQuit");
        confirm.addActionListener(this);
        cancel.addActionListener(this);
        p.add(confirm);
        p.add(cancel);
        d.setSize(160,120);
        d.setLocation(400,200);
        d.add(note,"Center");
        d.add(p,"South");
        return d;
    }
    
    public void actionPerformed(ActionEvent e){
        String s = e.getActionCommand();
        if(s.equals("登录")){
            loginDialog.setVisible(true);
        }else if(s.equals("退出")){
            this.quit();    
        }else if(s.equals("confirmQuit")){
            System.exit(0);    
        }else if(s.equals("cancelQuit")){
            quitDialog.setVisible(false);    
        }else if(s.equals("submitLogin")){
            String name = tf_name.getText();
            String password = tf_psw.getText();
            if(name.equals("Scott") && password.equals("Tiger")){
                info.setText("欢迎您: " + name + " 用户");    
            }else{
                info.setText("验证失败，错误的用户名/密码!");    
            }
            loginDialog.setVisible(false);    
        }else if(s.equals("cancelLogin")){
            loginDialog.setVisible(false);    
        }
    }
    public void quit(){
        quitDialog.setVisible(true);    
    }
}