第12章-Swing编程 --- 使用JOptionPane

import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;

public class JOptionPaneTest
{
    private JFrame jf = new JFrame("测试JOptionPane");
    //定义6个面板,分别用于定义对话框的几种选项
    private ButtonPanel messagePanel;
    private ButtonPanel messageTypePanel;
    private ButtonPanel msgPanel;
    private ButtonPanel confirmPanel;
    private ButtonPanel optionsPanel;
    private ButtonPanel inputPanel;
    private String messageString = "消息区内容";
    private Icon messageIcon = new ImageIcon("ico/heart.png");
    private Object messageObject = new Date();
    private Component messageComponent = new JButton("组件消息");
    private JButton msgBn = new JButton("消息对话框");
    private JButton confirmBn = new JButton("确认对话框");
    private JButton inputBn = new JButton("输入对话框");
    private JButton optionBn = new JButton("选项对话框");
    
    public void init()
    {
        JPanel top = new JPanel();
        top.setBorder(new TitledBorder(new EtchedBorder(),"对话框的通用选项",TitledBorder.CENTER,TitledBorder.TOP));
        top.setLayout(new GridLayout(1,2));
        //消息类型Panel,该Panel中的选项决定对话框的图标
        messageTypePanel = new ButtonPanel("选择消息的类型",new String[]{"ERROR_MESSAGE","INFORMATION_MESSAGE","WARNING_MESSAGE","QUESTION_MESSAGE","PLAIN_MESSAGE"});
        //消息内容类型Panel,该Panel中的选项决定对话框消息区的内容
        messagePanel = new ButtonPanel("选择消息内容的类型",new String[]{"字符串消息","图标消息","组件消息","普通对象消息","Object[]消息"});
        top.add(messageTypePanel);
        top.add(messagePanel);
        
        JPanel bottom = new JPanel();
        bottom.setBorder(new TitledBorder(new EtchedBorder(),"弹出不同的对话框",TitledBorder.CENTER,TitledBorder.TOP));
        bottom.setLayout(new GridLayout(1,4));
        //创建用于弹出消息对话框的Panel
        msgPanel = new ButtonPanel("消息对话框",null);
        msgBn.addActionListener(new ShowAction());
        msgPanel.add(msgBn);
        
        //创建用于弹出确认对话框的Panel
        confirmPanel = new ButtonPanel("消息 对话框",new String[]{"DEFAULT_OPTION","YES_NO_OPTION","YES_NO_CANCEL_OPTION","OK_CANCEL_OPTION"});
        confirmBn.addActionListener(new ShowAction());
        confirmPanel.add(confirmBn);
        
        //创建用于弹出输入对话框的Panel
        inputPanel = new ButtonPanel("输入对话框",new String[]{"单行文本框","下拉列表选择框"});
        inputBn.addActionListener(new ShowAction());
        inputPanel.add(inputBn);
        
        //创建用于弹出选项对话框的Panel
        optionsPanel = new ButtonPanel("选项对话框",new String[]{"字符串选项","图标选项","对象选项"});
        optionBn.addActionListener(new ShowAction());
        optionsPanel.add(optionBn);
        
        bottom.add(msgPanel);
        bottom.add(confirmPanel);
        bottom.add(inputPanel);
        bottom.add(optionsPanel);
        
        Box box = new Box(BoxLayout.Y_AXIS);
        box.add(top);
        box.add(bottom);
        jf.add(box);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.pack();
        jf.setVisible(true);
    }
    
    //根据用户选择返回选项类型
    private int getOptionType()
    {
        switch(confirmPanel.getSelection())
        {
            case "DEFAULT_OPTION":
                return JOptionPane.DEFAULT_OPTION;
            case "YES_NO_OPTION":
                return JOptionPane.YES_NO_OPTION;
            case "YES_NO_CANCEL_OPTION":
                return JOptionPane.YES_NO_CANCEL_OPTION;
            default:
                return JOptionPane.OK_CANCEL_OPTION;
        }
    }
    
    //根据用户选择返回消息
    private Object getMessage()
    {
        switch(messagePanel.getSelection())
        {
            case "字符串消息":
                return messageString;
            case "图标消息":
                return messageIcon;
            case "组件消息":
                return messageComponent;
            case "普通对象消息":
                return messageObject;
            default:
                return new Object[]{messageString,messageIcon,messageComponent,messageObject};
        }
    }
    
    //根据用户选择返回消息类型(决定图标区的图标)
    private int getDialogType()
    {
        switch(messageTypePanel.getSelection())
        {
            case "ERROR_MESSAGE":
                return JOptionPane.ERROR_MESSAGE;
            case "INFORMATION_MESSAGE":
                return JOptionPane.INFORMATION_MESSAGE;
            case "WARNING_MESSAGE":
                return JOptionPane.WARNING_MESSAGE;
            case "QUESTION_MESSAGE":
                return JOptionPane.QUESTION_MESSAGE;
            default:
                return JOptionPane.PLAIN_MESSAGE;
        }
    }
    
    private Object[] getOption()
    {
        switch(optionsPanel.getSelection())
        {
            case "字符串选项":
                return new String[]{"a","b","c","d"};
            case "图标选项":
                return new Icon[]{new ImageIcon("ico/1.gif"),
                                  new ImageIcon("ico/2.gif"),
                                  new ImageIcon("ico/3.gif"),
                                  new ImageIcon("ico/4.gif")};
            default:
                return new Object[]{new Date(),new Date(),new Date()};
        }
    }
    
    //为各按钮定义事件监听器
    private class ShowAction implements ActionListener
    {
        @Override
        public void actionPerformed(ActionEvent event)
        {
            switch(event.getActionCommand())
            {
                case "确认对话框":
                    JOptionPane.showConfirmDialog(jf, getMessage(),"确认对话框",getOptionType(),getDialogType());
                    break;
                case "输入对话框":
                    if(inputPanel.getSelection().equals("单行文本框"))
                    {
                        JOptionPane.showInputDialog(jf,getMessage(),"输入对话框",getDialogType());
                    }
                    else
                    {
                        JOptionPane.showInputDialog(jf,getMessage(),"输入对话框",getDialogType());
                    }
                    break;
                case "消息对话框":
                    JOptionPane.showMessageDialog(jf, getMessage(),"消息对话框",getDialogType());
                    break;
                case "选项对话框":
                    JOptionPane.showOptionDialog(jf, getMessage(), "选项对话框", getOptionType(), getDialogType(), null, getOption(), "a");
                    break;
            }
        }
    }
    
    public static void main(String[] args)
    {
        new JOptionPaneTest().init();
    }
}

//定义一个JPanel类扩展类,该类的对象包含多个纵向排列的
//JRadioButton控件,且Panel扩展类可以指定一个字符串作为TitledBorder
class ButtonPanel extends JPanel
{
    private ButtonGroup group;
    
    /**
     * 功能:带参数构造函数
     * @param title
     * @param options
     */
    public ButtonPanel(String title,String[] options)
    {
        setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(),title));
        setLayout(new BoxLayout(this,BoxLayout.Y_AXIS));
        group = new ButtonGroup();
        
        for(int i = 0;options != null && i < options.length;i++)
        {
            JRadioButton b = new JRadioButton(options[i]);
            b.setActionCommand(options[i]);
            add(b);
            group.add(b);
            b.setSelected(i == 0);
        }
    }
    
    //定义一个方法,用于返回用户选择的选项
    public String getSelection()
    {
        return group.getSelection().getActionCommand();
    }
}