swing13_17.java

来自「java 简单的java源码」· Java 代码 · 共 76 行

/**
 * ClassName: Swing13_17.class
 * Description: 卡片布局管理器
 * Copyright:    Copyright (c) 2002
 * Company: 中国青年出版社
 * @author: Hong Yi
 * @version 1.0
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class MyFrame extends JFrame
   implements ItemListener
{
    public MyFrame()
    {
	    setTitle("Swing示例程序17");
	    setSize(300, 200);
	    setLocation(100,100);

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

        Container contentPane = getContentPane();

        //建立下拉框，并且把它放到一个面板中
        String comboBoxItems[] = { "Show Buttons",  "Show TextField"};
        JPanel cbp = new JPanel();
        JComboBox c = new JComboBox(comboBoxItems);
        c.setEditable(false);
        c.addItemListener(this);
        cbp.add(c);

        contentPane.add(cbp, BorderLayout.NORTH);

		//建立cards面板，并且指定布局为CardLayout
        cards = new JPanel();
        cards.setLayout(new CardLayout());
		//建立第一个页面
        JPanel p1 = new JPanel();
        p1.add(new JButton("Dog"));
        p1.add(new JButton("Cat"));
        p1.add(new JButton("Horse"));
		//建立第一个页面
        JPanel p2 = new JPanel();
        p2.add(new JTextField("TextField", 20));
		//将所有的页面集合到一起
        cards.add(p1, "Show Buttons");
        cards.add(p2, "Show TextField");
        contentPane.add(cards, BorderLayout.CENTER);
    }

    public void itemStateChanged(ItemEvent evt)
    {	//相应下拉框的事件
        CardLayout cl = (CardLayout)(cards.getLayout());
        cl.show(cards, (String)evt.getItem());
    }

    private JPanel cards;
}

public class Swing13_17
{
	public static void main(String[] args)
    {
        MyFrame myFrame = new MyFrame();
        myFrame.setVisible(true);
    }
}