package com.unit13.demo;

import java.io.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.undo.CannotRedoException;

import javax.swing.undo.UndoManager;

import java.util.Date;

import java.text.SimpleDateFormat;

public class Notepad extends JFrame {

// 菜单

JMenuBar menub = new JMenuBar();

// 显示纯文本的多行区域

JTextArea text = new JTextArea();

JMenu files = new JMenu("文件(F)");

JMenu edit = new JMenu("编辑(E)");

JMenu formats = new JMenu("格式(O)");

JMenu help = new JMenu("帮助(H)");

JMenuItem newFile = new JMenuItem("新建(N)");

JMenuItem open = new JMenuItem("打开(O)");

JMenuItem save = new JMenuItem("保存(S)");

JMenuItem saveAs = new JMenuItem("另存为(A)");

JMenuItem exit = new JMenuItem("退出(X)");

JMenuItem undo = new JMenuItem("撤销(U)");

JMenuItem cut = new JMenuItem("剪切(T)");

JMenuItem copy = new JMenuItem("复制(C)");

JMenuItem paste = new JMenuItem("粘贴(P)");

JMenuItem selectAll = new JMenuItem("全选(A)");

JMenuItem timeDate = new JMenuItem("时间/日期(D)");

JCheckBoxMenuItem lineWrap = new JCheckBoxMenuItem("自动换行(M)");

JMenuItem fonts = new JMenuItem("字体");

JMenuItem about = new JMenuItem("关于记事本(A)");

JFrame th = this;

String name;

String openedPath = null;

boolean opened = false;

boolean reworked = false;

UndoManager undoManager = new UndoManager();

// 初始化窗体

public Notepad(String name) {

  super(name);

  this.name = name;

  int x, y;

  // 得到用户屏幕大小

  Dimension size = Toolkit.getDefaultToolkit().getScreenSize();

  x = (size.width - 600) / 2;

  y = (size.height - 400) / 2;

  setSize(600, 400);

  // 让程序界面显示在屏幕中央

  setLocation(x, y);

  // 将此窗口的最小大小设置为一个常量值。

  setMinimumSize(new Dimension(250, 150));

  setDefaultCloseOperation(EXIT_ON_CLOSE);

}

// 初始化布局

void init() {

  files.setMnemonic('F');

  edit.setMnemonic('E');

  formats.setMnemonic('O');

  help.setMnemonic('H');

  newFile.setMnemonic('N');

  open.setMnemonic('O');

  save.setMnemonic('S');

  saveAs.setMnemonic('A');

  exit.setMnemonic('X');

  undo.setMnemonic('U');

  cut.setMnemonic('T');

  copy.setMnemonic('C');

  paste.setMnemonic('P');

  selectAll.setMnemonic('A');

  timeDate.setMnemonic('D');

  lineWrap.setMnemonic('M');

  about.setMnemonic('A');

  // 为控件添加助记符

  newFile.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,

    InputEvent.CTRL_MASK));

  open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,

    InputEvent.CTRL_MASK));

  save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,

    InputEvent.CTRL_MASK));

  exit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q,

    InputEvent.CTRL_MASK));

  cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,

    InputEvent.CTRL_MASK));

  copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,

    InputEvent.CTRL_MASK));

  paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,

    InputEvent.CTRL_MASK));

  selectAll.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,

    InputEvent.CTRL_MASK));

  // 为控件添加快捷键

  timeDate.setAccelerator(KeyStroke.getKeyStroke("F5"));

  files.add(newFile);

  files.add(open);

  files.add(save);

  files.add(saveAs);

  files.addSeparator();

  files.add(exit);

  edit.add(undo);

  edit.addSeparator();

  edit.add(cut);

  edit.add(copy);

  edit.add(paste);

  edit.addSeparator();

  edit.add(selectAll);

  edit.add(timeDate);

  formats.add(lineWrap);

  formats.add(fonts);

  help.add(about);

  menub.add(files);

  menub.add(edit);

  menub.add(formats);

  menub.add(help);

  setJMenuBar(menub);

  getContentPane().add(new JScrollPane(text));

  Listen listen = new Listen();

  Listen1 listen1 = new Listen1();

  // 为控件添加事件侦听器

  newFile.addActionListener(listen);

  undo.addActionListener(listen);

  open.addActionListener(listen);

  save.addActionListener(listen);

  saveAs.addActionListener(listen);

  exit.addActionListener(listen);

  cut.addActionListener(listen);

  copy.addActionListener(listen);

  paste.addActionListener(listen);

  selectAll.addActionListener(listen);

  timeDate.addActionListener(listen);

  lineWrap.addActionListener(listen);

  about.addActionListener(listen);

  open.addActionListener(listen1);

  save.addActionListener(listen1);

  saveAs.addActionListener(listen1);

  // 暂时没有实现的功能 :设置字体

  //undo功能没有实现

  fonts.setEnabled(false);

}

class Listen implements ActionListener {

  // 实现用于一般操作的事件侦听器

  public void actionPerformed(ActionEvent e) {

   Object source = e.getSource();

   if (source == newFile) {

    text.setText("");

    // 设置标题

    th.setTitle(name);

    openedPath = null;

    opened = false;

   } else if (source == exit)

    setVisible(false);

   else if (source == undo)

    try {

     //此功能没有实现 撤销要用栈？

//      undo.setEnabled(undoManager.canUndo());

     undoManager.undo();

    } catch (CannotRedoException cre) {

     cre.printStackTrace();

    }

   else if (source == selectAll)

    text.selectAll();

   else if (source == cut)

    text.cut();

   else if (source == copy)

    text.copy();

   else if (source == paste)

    text.paste();

   else if (source == lineWrap)

    // 设置文本区的换行策略(获取文本区的换行策略)

    text.setLineWrap(!text.getLineWrap());

   else if (source == about) {

    String message = "--------\n版本：1.0\n作者：时超" +

      "\n撤销功能要用堆栈存贮操作" +

      "\n还有字体格式"+

      "\n暂时没有实现" +

      "\n\n感谢您的使用";

    JOptionPane.showMessageDialog(th, message, "关于",

      JOptionPane.PLAIN_MESSAGE);

   } else if (source == timeDate) {

    Date nowTime = new Date();

    SimpleDateFormat times = new SimpleDateFormat(

      "HH:mm yyyy-MM-dd");

    text.insert(times.format(nowTime), text.getCaretPosition());

   }

  }

}

class Listen1 implements ActionListener {

  // 实现用于对文件进行操作的事件侦听器

  public void actionPerformed(ActionEvent e) {

   Object source = e.getSource();

   // 打开文件事件

   if (source == open) {

    // 显示对话窗口 以便选择文件

    FileDialog openFile = new FileDialog(th, "打开文件",

      FileDialog.LOAD);

    openFile.setVisible(true);

    // 获取文件路径

    String filePath = openFile.getDirectory() + openFile.getFile();

    try {

     FileInputStream fis = new FileInputStream(filePath);

     byte[] content = new byte[fis.available()];

     fis.read(content);

     text.setText(new String(content));

     // 设置 TextComponent 的文本插入符的位置

     text.setCaretPosition(0);

     if (openFile.getFile() != null) {

      th.setTitle(openFile.getFile() + name);

      openedPath = filePath;

      opened = true;

     }

     fis.close();

    } catch (Exception ex) {

     ex.printStackTrace();

    }

    opened = true;

   }

   // 保存及另存为事件

   else if (source == save || source == saveAs) {

    String savePath = openedPath;

    if (savePath == null || source == saveAs) {

     // 如果 mode 的值为 LOAD，那么文件对话框将查找要读取的文件，所显示的文件是当前目录中的文件

     // 如果 mode 的值为 SAVE，则文件对话框将查找要写入文件的位置。

     FileDialog saveFile = new FileDialog(th, "保存文件",

       FileDialog.SAVE);

     saveFile.setVisible(true);

     savePath = saveFile.getDirectory() + saveFile.getFile();

    }

    try {

     FileOutputStream fos = new FileOutputStream(savePath);

     fos.write(text.getText().getBytes());

     fos.close();

    } catch (Exception ex) {

     ex.printStackTrace();

    }

    if (source == save)

     openedPath = savePath;

   }

  }

}

public static void main(String[] args) {

  try {

   // 使用当前线程的上下文类加载器加载给定类名称所指定的 LookAndFeel

   UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

  } catch (Exception e) {

   System.err.println("Couldn't use the system look and feel:" + e);

  }

  String name = ("--记事本  版本1.0--");

  Notepad note = new Notepad(name);

  note.init();

  note.setVisible(true);

}

}