Java记事本和界面（一）

package proe;

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.undo.*;
import java.util.*;

/**
 *<p>Title: 程序编辑器</p>
 *<p>Description: 增强的文本编辑程序</p>
 *<p>Copyright: Copyright (c) 2005</p>
 *<p>Company: </p>
 *@author 红色彼岸
 *@version 0.1
 */
class ProEFrame extends JFrame{
    private JFileChooser fileChooser = new JFileChooser();

    private JMenuBar menuBar;
    private JMenu file, edit, format, help;
    private JMenuItem newItem, openItem, saveItem, saveAsItem, pageSetItem, printItem, exitItem;
    private JMenuItem undoItem, redoItem, cutItem, copyItem, pasteItem, deleteItem, findItem, findNextItem, replaceItem, goToLineItem, selectAllItem, timeItem;
    private JMenuItem autoNextLineItem, fontItem;
    private JMenuItem helpItem, aboutItem;
    private JTextArea textArea;
    private JScrollPane scrollPane;
    private final int TAB_SIZE = 4;

    private File fileName;
    private boolean isChange = false;

    private final UndoManager undo = new UndoManager();

    public ProEFrame(String title) {
 //设置窗体的标题栏和默认关闭操作
     super(title);
 setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);

 //设置菜单栏和菜单的内容
 menuBar = new JMenuBar();
 file  = new JMenu("文件(F)");
 edit  = new JMenu("编辑(E)");
 format = new JMenu("格式(O)");
 help  = new JMenu("帮助(H)");
 setQuickKey(file, 'F');
 setQuickKey(edit, 'E');
 setQuickKey(format, 'O');
 setQuickKey(help, 'H');
 newItem = new JMenuItem("新建(N)");
 openItem = new JMenuItem("打开(O)...");
 saveItem = new JMenuItem("保存(S)");
 saveAsItem = new JMenuItem("另存为...");
 pageSetItem = new JMenuItem("页面设置(U)...");
 printItem = new JMenuItem("打印(P)...");
 exitItem = new JMenuItem("退出");
 setQuickKey(newItem, 'N');
 setQuickKey(openItem, 'O');
 setQuickKey(saveItem, 'S');
 setQuickKey(pageSetItem, 'U');
 setQuickKey(printItem, 'P');
 
 file.add(newItem);
 file.add(openItem);
 file.add(saveItem);
 file.add(saveAsItem);
 file.addSeparator();
 file.add(pageSetItem);
 file.add(printItem);
 file.addSeparator();
 file.add(exitItem);

 undoItem = new JMenuItem("撤销(Z)");
 redoItem = new JMenuItem("恢复(R)");
 cutItem = new JMenuItem("剪切(X)");
 copyItem = new JMenuItem("复制(C)");
 pasteItem = new JMenuItem("粘贴(V)");
 deleteItem = new JMenuItem("删除");
 findItem = new JMenuItem("查找(F)...");
 findNextItem = new JMenuItem("查找下一个");
 replaceItem = new JMenuItem("替换...");
 goToLineItem = new JMenuItem("转到(G)...");
 selectAllItem = new JMenuItem("全选(A)");
 timeItem = new JMenuItem("时间/日期");

 setQuickKey(undoItem, 'Z');
 setQuickKey(redoItem, 'R');
 setQuickKey(cutItem, 'X');
 setQuickKey(copyItem, 'C');
 setQuickKey(pasteItem, 'V');
 setQuickKey(findItem, 'F');
 setQuickKey(goToLineItem, 'G');
 setQuickKey(selectAllItem, 'A');
 
 edit.add(undoItem);
 edit.add(redoItem);
 edit.addSeparator();
 edit.add(cutItem);
 edit.add(copyItem);
 edit.add(pasteItem);
 edit.add(deleteItem);
 edit.addSeparator();
 edit.add(findItem);
 edit.add(findNextItem);
 edit.add(replaceItem);
 edit.add(goToLineItem);
 edit.addSeparator();
 edit.add(selectAllItem);
 edit.add(timeItem);

 autoNextLineItem = new JMenuItem("自动换行(W)");
 fontItem = new JMenuItem("字体...");

 setQuickKey(autoNextLineItem, 'W');

 format.add(autoNextLineItem);
 format.add(fontItem);

 helpItem = new JMenuItem("帮助主题(H)");
 aboutItem = new JMenuItem("关于ProE");

 setQuickKey(helpItem, 'H');

 help.add(helpItem);
 help.add(aboutItem);

 menuBar.add(file);
 menuBar.add(edit);
 menuBar.add(format);
 menuBar.add(help);
 setJMenuBar(menuBar);

 textArea = new JTextArea();
 textArea.setTabSize(TAB_SIZE);
 //支持撤销/恢复操作的监听方法
 textArea.getDocument().addUndoableEditListener(new UndoableEditListener() {
     public void undoableEditHappened(UndoableEditEvent evt) {
      undo.addEdit(evt.getEdit());
     }
 });
 //监听文档内容是否发生变化
 textArea.getDocument().addDocumentListener(
  new DocumentListener() {
   public void changedUpdate(DocumentEvent de) {
    isChange = true;
   }
   public void insertUpdate(DocumentEvent de) {
    isChange = true;
   }
   public void removeUpdate(DocumentEvent de) {
    isChange = true;
   }
  }
 );
 scrollPane = new JScrollPane(textArea);
 this.getContentPane().add(scrollPane, BorderLayout.CENTER);

 //测试用的方法
 MenuItemEventHandler menuItemHandler = new MenuItemEventHandler();
 newItem.addActionListener(menuItemHandler);
 openItem.addActionListener(menuItemHandler);
 saveItem.addActionListener(menuItemHandler);
 saveAsItem.addActionListener(menuItemHandler);
 pageSetItem.addActionListener(menuItemHandler);
 printItem.addActionListener(menuItemHandler);
 exitItem.addActionListener(menuItemHandler);
 undoItem.addActionListener(menuItemHandler);
 redoItem.addActionListener(menuItemHandler);
 cutItem.addActionListener(menuItemHandler);
 copyItem.addActionListener(menuItemHandler);
 pasteItem.addActionListener(menuItemHandler);
 deleteItem.addActionListener(menuItemHandler);
 findItem.addActionListener(menuItemHandler);
 findNextItem.addActionListener(menuItemHandler);
 replaceItem.addActionListener(menuItemHandler);
 goToLineItem.addActionListener(menuItemHandler);
 selectAllItem.addActionListener(menuItemHandler);
 timeItem.addActionListener(menuItemHandler);
 autoNextLineItem.addActionListener(menuItemHandler);
 fontItem.addActionListener(menuItemHandler);
 helpItem.addActionListener(menuItemHandler);
 aboutItem.addActionListener(menuItemHandler);

 addWindowListener(new WindowAdapter() {
  public void windowClosing(WindowEvent we) {
   exitPerformed();
  }
 });
    }

    //辅助方法：为菜单或者菜单项设定快捷键
    private void setQuickKey(AbstractButton button, char quickKey) {
 String type = button.getClass().getSimpleName();
 if(type.equals("JMenu"))
  button.setMnemonic(quickKey);
 else if(type.equals("JMenuItem")) {
  JMenuItem menuItem = (JMenuItem)button;
  menuItem.setAccelerator(KeyStroke.getKeyStroke(quickKey, InputEvent.CTRL_MASK));
 }
    }

    //辅助方法：测试JTextArea中文本是否有变化
    private boolean hasChange() {
 return isChange;
    }

    //内部方法：响应菜单事件
    private void newPerformed() {
 int value = -1;
 if(hasChange())
  if(fileName != null && fileName.exists()) {
   String[] buttonTexts = {"保存", "不保存", "取消"};
   value = JOptionPane.showOptionDialog(this, "源程序已经改变，请确认是否保存！", "保存更改？", JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, buttonTexts, buttonTexts[0]);
   if(value == JOptionPane.YES_OPTION)
    savePerformed();
   else if(value == JOptionPane.NO_OPTION) {
    fileName = null;
    textArea.setText("");
    setTitle("程序编辑器");
    return;
   }
   else if(value == JOptionPane.CANCEL_OPTION)
    return;
  }
  else {
   saveAsPerformed();
   fileName = null;
   textArea.setText("");
   setTitle("程序编辑器");
   return;
  }
 fileName = null;
 textArea.setText("");
 setTitle("程序编辑器");
 isChange = false;
 return;
    }

    private void openPerformed() {
 BufferedReader input = null;
 String text;
 int ret = fileChooser.showOpenDialog(this);
 if(ret != JFileChooser.APPROVE_OPTION)
    return;
 newPerformed();
 fileName = fileChooser.getSelectedFile();
 if(fileName.exists() && fileName.canRead()) {
     setTitle("程序编辑器: " + fileName.getName());
     try{
         input = new BufferedReader(new FileReader(fileName));
         while((text = input.readLine()) != null)
      textArea.append(text + "\n");
         input.close();
     }
     catch(IOException e) {
         JOptionPane.showMessageDialog(this, "文件打开错误，没有打开");
     }
     finally {
  input = null;
     }
 }
 isChange = false;
    }
    private void savePerformed() {
 if(!hasChange())
  return;
 PrintWriter output = null;
 if(fileName != null && fileName.exists()) {
     try{
     output = new PrintWriter(fileName);
     output.write(textArea.getText());
     }
     catch(IOException e)
     {
         JOptionPane.showMessageDialog(this, "文件写入错误，没有保存");
     }
     finally {
         output.close();
         output = null;
     }
     isChange = false;
 }
 else
     saveAsPerformed();
    }
    private void saveAsPerformed() {
  if(!hasChange())
     return;
 PrintWriter output = null;
 int ret = fileChooser.showSaveDialog(this);
 if(ret != JFileChooser.APPROVE_OPTION) {
       isChange = true;
     return;
 }

 fileName = fileChooser.getSelectedFile();
 setTitle("程序编辑器: " + fileName.getName());
 try{
     output = new PrintWriter(fileName);
          output.write(textArea.getText()); 
 }
 catch(IOException e){
  JOptionPane.showMessageDialog(this, "文件写入错误，没有保存"); 
 }
 finally{
     output.close();
     output = null;
 }
 isChange = false;
    }
    private void pageSetPerformed() {
 System.out.println("显示页面设置对话框");
    }
    private void printPerformed() {
 System.out.println("显示打印对话框");
    }
    private void exitPerformed() {
 String[] buttonTexts = {"保存退出", "不保存退出", "取消"};
 int value = -1;
 if(hasChange()) {
     value = JOptionPane.showOptionDialog(this, "源程序已经改变，请是否选择保存或直接退出！", "退出程序", JOptionPane.DEFAULT_OPTION, JOptionPane.QUESTION_MESSAGE, null, buttonTexts, buttonTexts[0]);
     switch(value)
     {
         case JOptionPane.YES_OPTION:
  savePerformed();
  break;
         case JOptionPane.NO_OPTION:
  System.exit(0);
  break;
         case JOptionPane.CANCEL_OPTION:
  isChange = true;
  return;
     }
 }
 else
     System.exit(0);
    }
    private void undoPerformed() {
 try{
  if(undo.canUndo())
   undo.undo();
 }catch(CannotUndoException e) {
  JOptionPane.showMessageDialog(this, "无法执行撤销操作", "撤销异常", JOptionPane.WARNING_MESSAGE);
 }
    }
    private void redoPerformed() {
 try{
  if(undo.canRedo())
   undo.redo();
 }catch(CannotRedoException e) {
  JOptionPane.showMessageDialog(this, "无法执行恢复操作", "恢复异常", JOptionPane.WARNING_MESSAGE);
 }
    }
    private void cutPerformed() {
 textArea.cut();
    }
    private void copyPerformed() {
 textArea.copy();
    }
    private void pastePerformed() {
 textArea.paste();
    }
    private void deletePerformed() {
 textArea.replaceRange(null, textArea.getSelectionStart(), textArea.getSelectionEnd());
    }
    private void findPerformed() {
 String findString = JOptionPane.showInputDialog(this, );
    }
    private void findNextPerformed() {
 System.out.println("查找下一个");
    }
    private void replacePerformed() {
 System.out.println("替换");
    }
    private void goToLinePerformed() {
 System.out.println("转到");
    }
    private void selectAllPerformed() {
 textArea.selectAll();
    }
    private void timePerformed() {
 textArea.insert((new Date()).toString(), textArea.getSelectionEnd());
    }
    private void autoNextLinePerformed() {
 System.out.println("自动换行");
    }
    private void fontPerformed() {
 System.out.println("字体");
    }
    private void helpPerformed() {
 System.out.println("帮助主题");
    }
    private void aboutPerformed() {
 System.out.println("关于程序");
    }

   /**
    *<p>Title: </p>
    *<p>Description: 处理菜单出发的事件</p>
    *<p>Copyright: Copyright (c) 2005</p>
    *<p>Company: </p>
    *@author 红色彼岸
    *@version 0.1
    */
    class MenuItemEventHandler implements ActionListener{
 public void actionPerformed(ActionEvent e) {
     JMenuItem item = (JMenuItem)e.getSource();
     if(item == newItem)
  newPerformed();
     else if(item == openItem)
  openPerformed();
     else if(item == saveItem)
  savePerformed();
     else if(item == saveAsItem)
  saveAsPerformed();
     else if(item == pageSetItem)
  pageSetPerformed();
     else if(item == printItem)
  printPerformed();
     else if(item == exitItem)
  exitPerformed();
     else if(item == undoItem)
  undoPerformed();
     else if(item == redoItem)
  redoPerformed();
     else if(item == cutItem)
  cutPerformed();
     else if(item == copyItem)
  copyPerformed();
     else if(item == pasteItem)
  pastePerformed();
     else if(item == deleteItem)
  deletePerformed();
     else if(item == findItem)
  findPerformed();
     else if(item == findNextItem)
  findNextPerformed();
     else if(item == replaceItem)
  replacePerformed();
     else if(item == goToLineItem)
  goToLinePerformed();
     else if(item == selectAllItem)
  selectAllPerformed();
     else if(item == timeItem)
  timePerformed();
     else if(item == autoNextLineItem)
  autoNextLinePerformed();
     else if(item == fontItem)
  fontPerformed();
     else if(item == helpItem)
  helpPerformed();
     else if(item == aboutItem)
  aboutPerformed();
 }
    }
}

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