str2 = str1.toLowerCase();
                                  str3 = tfro.getText();
                                  str4 = str3.toLowerCase();
                                  if(drMatchCase.getState()) {
                                    strA = str1;
                                    strB = str3;
                                  }
                                  else {
                                    strA = str2;
                                    strB = str4;
                                  }
                                  a = strA.indexOf(strB, FindStartPos);
                                  if(a > -1) {
                                    ta.setCaretPosition(a);
                                    b = tfro.getText().length();
                                    ta.select(a, a + b);
                                    FindStartPos = a + b;
                                    foundCount++;
                                  }
                                  else {
                                    JOptionPane.showMessageDialog(null, "End of file.", "Result",1);
                                    foundCount = 0;
                                  }
                                  if(tfrn.getText().length() == 0 && ta.getSelectedText() != null)
                                    ta.replaceSelection("");
                                  if(tfrn.getText().length() > 0 && ta.getSelectedText() != null)
                                    ta.replaceSelection(tfrn.getText());
                                  }
                              }
                            });
      Button brc = new Button("Cancel");
      brc.addActionListener(new ActionListener() {
                              public void actionPerformed(ActionEvent brce) {
                                dispose();
                              }
                           });
      p2.add(brf);
      p2.add(brr);
      p2.add(brra);
      p2.add(brc);
      dr.setResizable(false);
      dr.setLocation(120, 120);
      dr.addWindowListener(new WindowAdapter() {
                             public void windowClosing(WindowEvent e) {
                               dispose();
                               FindStartPos = 0;
                             }
                           });
      dr.setSize(220,138);
      dr.setVisible(true);

    }
    else if(ae.getSource() == menuEditGoTo) {
      // GoTo操作
	  JDialog dg = new JDialog(this, "Line Number", true);
      dg.getContentPane().setLayout(new FlowLayout());
      final JTextField dgtf = new JTextField(4);
      Button dgOk = new Button("Go To");
      dgOk.addActionListener(new ActionListener() {
                               public void actionPerformed(ActionEvent brce) {
                                 int totalLine = ta.getLineCount();
                                 int[] lineNumber = new int[totalLine + 1];
                                 String s = ta.getText();
                                 int pos = 0, t = 0;
                                 while(true) {
                                   pos = s.indexOf('\12', pos);
                                   if(pos == -1)
                                     break;
                                   lineNumber[t++] = pos++;
                                 }
                                 int gt = 1;
                                 try {
                                   gt = Integer.parseInt(dgtf.getText());
                                 } catch(NumberFormatException efe) {
                                   JOptionPane.showMessageDialog(null, "Please enter an integer.", "Input",1);
                                 }
                                 if(gt < 2 || gt >= totalLine) {
                                   if(gt < 2)
                                     ta.setCaretPosition(0);
                                   else
                                     ta.setCaretPosition(s.length());
                                 }
                                 else
                                   ta.setCaretPosition(lineNumber[gt-2] + 1);
                                 dispose();
                               }
                            });
      Button dgCancel = new Button("Cancel");
      dgCancel.addActionListener(new ActionListener() {
                                   public void actionPerformed(ActionEvent brce) {
                                     dispose();
                                   }
                               });
      dg.getContentPane().add(dgtf);
      dg.getContentPane().add(dgOk);
      dg.getContentPane().add(dgCancel);
      dg.setResizable(false);
      dg.setLocation(120, 120);
      dg.addWindowListener(new WindowAdapter() {
                             public void windowClosing(WindowEvent e) {
                               dispose();
                             }
                           });
      dg.setSize(180,60);
      dg.setVisible(true);
    }
    else if(ae.getSource() == menuEditSelectAll) {
       // SelectAll操作
	   ta.selectAll();
    }
    else if(ae.getSource() == menuViewFont) {
      // Font操作
	  MenuFont mf = new MenuFont(this, true);
      ta.setFont(mf.myLayout(ta.getFont()));
    }
    else if(ae.getSource() == menuViewColor) {
      // Color操作
	  MenuColor mc = new MenuColor(this, true);
      Color[]  fbgc = new Color[2];
      fbgc = mc.myLayout(ta.getForeground(), ta.getBackground());
      ta.setForeground(fbgc[0]);
      ta.setBackground(fbgc[1]);
      ta.setCaretColor(fbgc[0]);
    }
    else if(ae.getSource() == menuViewClassic) {
      // 切換經典模式
	  if(menuViewClassic.getState()) {
        ta.setForeground(new Color(0, 255, 0));
        ta.setBackground(new Color(45, 0, 45));
        ta.setFont(new Font("Serif", Font.BOLD, 16));
        ta.setCaretColor(new Color(0, 255, 0));
      }
      else {
        ta.setForeground(defaultForeground);
        ta.setBackground(defaultBackground);
        ta.setFont(defaultFont);
        ta.setCaretColor(defaultCaretColor);
      }
    }
    else if(ae.getSource() == menuViewStatus) {
      // 顯示狀態
	  if(menuViewStatus.getState()) {
        showStatus();
      }
    }
    else if(ae.getSource() == menuViewWordWrap) {
      if(menuViewWordWrap.getState()) {
        ta.setLineWrap(true);
      }
      else {
        ta.setLineWrap(false);
      }
    }
    else if(ae.getSource() == menuViewDoubleSpace) {
      int pos = 0, t = 0;
      String str = ta.getText();
      while(true){
        pos = str.indexOf('\15', pos);
        if(pos == -1) break;
        str = str.substring(0, pos) + '\15' + '\12' + str.substring(pos);
        pos = pos + 3;
      }
      ta.setText(str);
    }
    else if(ae.getSource() == menuHelpAbout) {
      // Help
	  dl = new JDialog(this,"About MiniEditor", true);
      dl.getContentPane().setLayout(new GridLayout(3,3));
      dl.setBackground(new Color(212,208,200));
      Button bOk = new Button("OK");
      bOk.addActionListener(new ActionListener() {
                              public void actionPerformed(ActionEvent bOke) {
                                dispose();
                              }
                            });
      Label ver = new Label("Version 1.0 ");
      Label null1 = new Label();
      Label null2 = new Label();
      Label null3 = new Label();
      Label null4 = new Label();
      Label null5 = new Label();
      Label null6 = new Label();
      Label null7 = new Label();
      dl.getContentPane().add(null1);
      dl.getContentPane().add(ver);
      dl.getContentPane().add(null2);
      dl.getContentPane().add(null3);
      dl.getContentPane().add(bOk);
      dl.getContentPane().add(null4);
      dl.getContentPane().add(null5);
      dl.getContentPane().add(null6);
      dl.getContentPane().add(null7);
      bOk.addActionListener(this);
      dl.addWindowListener(new WindowAdapter() {
                             public void windowClosing(WindowEvent e) {
                               dispose();
                             }
                           });
      dl.setLocation(120, 120);
      dl.setResizable(false);
      dl.setSize(200,80);
      dl.setVisible(true);

    }
  }//end of ActionListener

  //DocumentListener
  public void removeUpdate(DocumentEvent e) {
    String s;
    s = fileStatus.getText();
    if(!s.endsWith("*") & beginTextListener & !isNewFile) {
      fileStatus.setText("*");
    }
    menuEditUndo.setEnabled(true);
  }
  public void insertUpdate(DocumentEvent e) {
    String s;
    s = fileStatus.getText();
    if(!s.endsWith("*") & beginTextListener & !isNewFile) {
      fileStatus.setText("*");
    }
    menuEditUndo.setEnabled(true);
  }
  public void changedUpdate(DocumentEvent e) {
    String s;
    s = fileStatus.getText();
    if(!s.endsWith("*") & beginTextListener & !isNewFile) {
      fileStatus.setText("*");
    }
    menuEditUndo.setEnabled(true);
  }
  //end of DocumentListener

  // Caretlistener
  public void caretUpdate(CaretEvent e) {
    if(menuViewStatus.getState())
      showStatus();
  }// end of Caretlistener

  // KeyListener
  public void keyPressed(KeyEvent e) {
    if(e.getKeyCode() == '\10') {
      BACKSPACE = true;
    }
    //if(menuViewStatus.getState())
    //  showStatus();
  }
  public void keyReleased(KeyEvent e) {
    if(e.getKeyCode() == 155) { //ESCAPE = 155
      if(INSERTMODE)
        INSERTMODE = false;
      else
        INSERTMODE = true;
    }
    if(menuViewStatus.getState())
      showStatus();
  }
  public void keyTyped(KeyEvent e) {
    beginTextListener = true;
    isNewFile = false;
    if(!BACKSPACE) {
      if(!INSERTMODE) {
        int pos = ta.getCaretPosition();
        char c = ta.getText().charAt(pos);
        if(c == '\12') {
        }
        else if(c == '\15') {
        }
        else {
          ta.replaceRange("", pos, pos + 1);
        }
      }
    }
    BACKSPACE = false;
  }// end of KeyListener

  void showStatus() {
    int rows, cols, from, current, to, fileSize;
    rows = cols = from = current = 0;
    to = ta.getCaretPosition();
    fileSize = 0;
    String str = ta.getText();
    cols = to - str.substring(0, to).lastIndexOf(10);
    fileSize = str.length();
    String mode;
    if(INSERTMODE) {
      mode = "INSERT";
    }
    else {
      mode = "OVERLAY";
    }
    try {
      rows = ta.getLineOfOffset(to) + 1;
    } catch(BadLocationException ble) {
    }
    statusRow.setText("Row: " + rows);
    statusCol.setText("Col: " + cols);
    statusMode.setText("Mode: " + mode);
    statusSize.setText("Size: " + fileSize);
    //fileStatus.setText("file status:                                ");
  }
  
  // 單詞定位方法 
  int wordLocation(String str, int pos, boolean isToRight) {
    char c;
    if(isToRight) {
      c = str.charAt(pos);
      while(true) {
        if(c < 48) break;
        else if(c >  57 & c < 65) break;
        else if(c >  90 & c < 97) break;
        else if(c > 122) break;
        pos++;
        c = str.charAt(pos);
      }
      return pos--;
    }
    else {
      pos--;
      c = str.charAt(pos);
      while(true) {
        if(c < 48) break;
        else if(c >  57 & c < 65) break;
        else if(c >  90 & c < 97) break;
        else if(c > 122) break;
        pos--;
        c = str.charAt(pos);
      }
      return pos++;
    }

  }

class UndoHandler implements UndoableEditListener {
  public void undoableEditHappened(UndoableEditEvent uee) {
    undo.addEdit(uee.getEdit());
  }
}

}//end of class MiniEditor