import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;
 
 
 
public class Text_editor extends JFrame {
    JTextPane textPane = new JTextPane(); //文字窗格，編輯視窗
    JLabel statusBar = new JLabel(); //狀態列
    JFileChooser filechooser = new JFileChooser(); //檔案選擇器
 
    public Text_editor() {
        super("文字編輯器"); 
 
        Action[] actions = 
            {
                new NewAction(),
                new OpenAction(),
                new SaveAction(),
                new CutAction(),
                new CopyAction(),
                new PasteAction(),
                new AboutAction(),
                new ExitAction()};
 
        setJMenuBar(createJMenuBar(actions)); 
        Container container = getContentPane();
        container.add(textPane, BorderLayout.CENTER); //增加文字窗格
        container.add(statusBar, BorderLayout.SOUTH); //增加狀態列
 
        setSize(330, 350); //設定視窗尺寸
        setVisible(true);  //設定視窗可視
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  //關閉視窗時退出程式
    }
 
    private JMenuBar createJMenuBar(Action[] actions) { 
        JMenuBar menubar = new JMenuBar();
        JMenu menuFile = new JMenu("檔案");
        JMenu menuEdit = new JMenu("編輯");
        JMenu menuAbout = new JMenu("幫助");
        menuFile.add(new JMenuItem(actions[0])); //增加新選單項
        menuFile.add(new JMenuItem(actions[1]));
        menuFile.add(new JMenuItem(actions[2]));
        menuFile.add(new JMenuItem(actions[7]));
        menuEdit.add(new JMenuItem(actions[3]));
        menuEdit.add(new JMenuItem(actions[4]));
        menuEdit.add(new JMenuItem(actions[5]));
        menuAbout.add(new JMenuItem(actions[6]));
        menubar.add(menuFile); //增加選單
        menubar.add(menuEdit);
        menubar.add(menuAbout);
        return menubar; //返回選單欄
    }
 
 
    class NewAction extends AbstractAction {
        public NewAction() {
            super("新建");
        }
        public void actionPerformed(ActionEvent e) {
            textPane.setDocument(new DefaultStyledDocument()); //清空文件
        }
    }
 
    class OpenAction extends AbstractAction {
        public OpenAction() {
            super("開啟");
        }
        public void actionPerformed(ActionEvent e) {
            int i = filechooser.showOpenDialog(Text_editor.this);
            if (i == JFileChooser.APPROVE_OPTION) {
                File f = filechooser.getSelectedFile();
                try {
                    InputStream is = new FileInputStream(f);
                    textPane.read(is, "d");
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        }
    }
 
    class SaveAction extends AbstractAction {
        public SaveAction() {
            super("儲存");
        }
        public void actionPerformed(ActionEvent e) {
            int i = filechooser.showSaveDialog(Text_editor.this);
            if (i == JFileChooser.APPROVE_OPTION) { 
                File f = filechooser.getSelectedFile();
                try {
                    FileOutputStream out = new FileOutputStream(f);
                    out.write(textPane.getText().getBytes());       
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        }
    }
 
    class ExitAction extends AbstractAction {
        public ExitAction() {
            super("退出");
        }
        public void actionPerformed(ActionEvent e) {
            System.exit(0);  //退出程式
        }
    }
 
    class CutAction extends AbstractAction {
        public CutAction() {
            super("剪下");
        }
        public void actionPerformed(ActionEvent e) {
            textPane.cut(); 
        }
    }
 
    class CopyAction extends AbstractAction { 
        public CopyAction() {
            super("拷貝");
        }
        public void actionPerformed(ActionEvent e) {
            textPane.copy(); 
        }
    }
 
    class PasteAction extends AbstractAction { 
        public PasteAction() {
            super("貼上");
        }
        public void actionPerformed(ActionEvent e) {
            textPane.paste();  //呼叫文字窗格的貼上命令
        }
    }
 
    class AboutAction extends AbstractAction {
        public AboutAction() {
            super("關於");
        }
        public void actionPerformed(ActionEvent e) {
            JOptionPane.showMessageDialog(Text_editor.this, "ion製作");
        }
    }
 
    public static void main(String[] args) {
        new Text_editor();
    }
 
}