JavaMe開發(fā)繪制文本框TextEdit

更新時間：2015年09月27日 14:17:30 投稿：lijiao

在JavaMe連載(3)-也說MVC設計模式一文中提到了一個TextEdit類，但沒有給出具體實現(xiàn)，TextEdit是采用GameCanvas繪制的文本編輯器。本文結合實例給出實現(xiàn)的方法。

【問題描述】

TextEdit是采用GameCanvas繪制的文本編輯器。本文結合實例給出實現(xiàn)的方法。

【原理】

1 運用Graphics、GameCanvas繪制文本框和光標。

2 檢測到輸入事件時，跳轉到高級界面->TextBox 。通過系統(tǒng)調用輸入法完成輸入。

3 將TextBox輸入的值返回給TextEdit對象。

【設計模式】

這個過程有點類似裝飾模式，實際上，實現(xiàn)輸入的還是TextBox，只是給TextBox裝飾了一下，形成了一個漂亮的外觀。

【代碼清單】

TextEdit.java

package com.token.view.components; 
 
import javax.microedition.lcdui.Font; 
import javax.microedition.lcdui.Graphics; 
import javax.microedition.lcdui.game.GameCanvas; 
 
public class TextEdit extends GameCanvas 
{ 
  private Font ft; 
   
  public int width; 
  public int height; 
   
  public TextEdit(GameCanvas canvas)  
  { 
    super(false); 
     
  } 
   
  //繪制文本框 
  public void drawTextBox(GameCanvas canvas, Graphics graphics, String text, int x, int y, boolean cursorBlinkOn) 
  { 
    //System.out.println("draw"); 
    int padding = 4; 
    int margin = 2; 
     
    ft = Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_PLAIN,Font.SIZE_MEDIUM); 
    graphics.setFont(ft); 
     
    width = 3*canvas.getWidth()/5+2*padding; 
    height = ft.getHeight()+2*padding; 
 
    graphics.setColor(Color.frame); 
    graphics.fillRect(x+1,y+1,width+margin,height+margin); 
     
    graphics.setColor(Color.frameBg); 
    graphics.drawRect(x, y,width, height); 
    graphics.setColor(Color.background); 
    graphics.fillRect(x+1, y+1,width-1,height-1); 
     
    graphics.setColor(Color.text); 
    graphics.drawString(text, x+padding, y+padding, Graphics.TOP|Graphics.LEFT); 
     
    drawCursor(graphics, x+ft.stringWidth(text)+padding, y+padding, 1, ft.getHeight(), cursorBlinkOn); 
     
    canvas.flushGraphics(x,y,width,height); 
  } 
 
 
  //繪制光標 
  public void drawCursor(Graphics graphics, int x, int y, int width, int height, boolean cursorBlinkOn) 
  { 
    if(cursorBlinkOn) 
    { 
      ft = Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_PLAIN,Font.SIZE_MEDIUM); 
      graphics.setFont(ft); 
      graphics.setColor(0x0,0x0,0x0); 
      graphics.drawLine(x+width,y,x+width,y+height); 
    } 
  } 
} 
PopUpTextBox.java

package com.token.view; 
 
import javax.microedition.lcdui.Command; 
import javax.microedition.lcdui.CommandListener; 
import javax.microedition.lcdui.Displayable; 
import javax.microedition.lcdui.TextBox; 
 
import com.token.util.UIController; 
 
public class PopUpTextBox extends TextBox { 
 
   private UIController controller; 
   protected String canvasText = ""; 
   private Command okCommand; 
   private Command cancelCommand; 
   private String object_name = null; 
   private String editor = null; 
   private Object args_t[]; 
   private Object[] args; 
    
   
   public PopUpTextBox(UIController control, String title, String text, int maxsize, int constraints)  
   { 
     super(title, text, maxsize, constraints); 
     controller = control; 
      
     args = new Object[6]; 
      
     okCommand = new Command("確定", Command.OK, 1); 
     cancelCommand = new Command("取消", Command.CANCEL, 1); 
      
     this.addCommand(okCommand); 
     this.addCommand(cancelCommand); 
     this.setCommandListener(new TextBoxListener()); 
   } 
    
   public void init(Object[] args) 
   { 
     object_name = ((String)args[0]!=null)?(String)args[0]:""; 
     editor = ((String)args[1]!=null)?(String)args[1]:""; 
     //System.out.println(object_name); 
     //System.out.println(editor); 
     args_t = args; 
     this.setString(""); 
   } 
      
   protected void closeTextBox(boolean update) { 
      if (update) canvasText = this.getString(); 
      //System.out.println(canvasText); 
 
      if(object_name.equals("registScreen")) 
      { 
        if(editor.equals("regist_name")) 
        { 
          if(args_t[3]!=""||args_t[3]!=null||args_t[4]!=""||args_t[4]!=null) 
          { 
            args[0] = object_name; 
            args[1] = editor; 
            args[2] = this.canvasText; 
            args[3] = args_t[3]; 
            args[4] = args_t[4]; 
          } 
          controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args); 
        } 
        else if(editor.equals("regist_passwd")) 
        { 
          if(args_t[2]!=""||args_t[2]!=null||args_t[4]!=""||args_t[4]!=null) 
          { 
            args[0] = object_name; 
            args[1] = editor; 
            args[2] = args_t[2]; 
            args[3] = this.canvasText; 
            args[4] = args_t[4]; 
          } 
          controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args); 
        } 
        else if(editor.equals("regist_passwd_re")) 
        { 
          if(args_t[2]!=""||args_t[2]!=null||args_t[3]!=""||args_t[3]!=null) 
          { 
            args[0] = object_name; 
            args[1] = editor; 
            args[2] = args_t[2]; 
            args[3] = args_t[3]; 
            args[4] = this.canvasText; 
          } 
          controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args); 
        } 
      } 
       
      //... 
  } 
    
   private class TextBoxListener implements CommandListener 
   {  
    public void commandAction(Command command, Displayable disp) 
    { 
      if(command==okCommand) 
      { 
        closeTextBox(true); 
      } 
      else if(command==cancelCommand) 
      { 
        closeTextBox(false); 
      } 
    } 
  } 
} 
UserRegist.java

package com.token.view; 
 
import javax.microedition.lcdui.Font; 
import javax.microedition.lcdui.Graphics; 
import javax.microedition.lcdui.game.GameCanvas; 
import com.token.model.*; 
import com.token.util.*; 
import com.token.view.components.*; 
 
public class UserRegist extends GameCanvas implements Runnable { 
 
  private UIController controller; 
  private Graphics graphics; 
   
  private Font ft; 
   
  private Menu menu; 
  private Head head; 
  private BackGroud backGroud; 
   
  private UserDataRecord userRecord; 
 
  private String title; 
   
  private TextEdit textEdit_name; 
  private TextEdit textEdit_passwd; 
  private TextEdit textEdit_passwd_re; 
  private int textEdit_name_x; 
  private int textEdit_name_y; 
  private int textEdit_passwd_x; 
  private int textEdit_passwd_y; 
  private int textEdit_passwd_re_x; 
  private int textEdit_passwd_re_y; 
  private int currentlySelectedIndex = 0; 
   
  private String username; 
  private String passwd; 
  private String passwd_re; 
   
  long caretBlinkDelay = 500L; 
  long lastCaretBlink = 0; 
  private String object_name; 
  private String editor; 
  private boolean cursorBlinkOn1; 
  private boolean cursorBlinkOn2; 
  private boolean cursorBlinkOn3; 
   
  private int width; 
  private int height; 
   
  public UserRegist(UIController control)  
  { 
    super(false); 
    this.controller=control; 
    this.title = "用戶注冊"; 
    setFullScreenMode(true); 
    graphics = getGraphics(); 
     
    width = getWidth(); 
    height = getHeight(); 
     
    menu = new Menu(this); 
    head = new Head(this); 
    backGroud = new BackGroud(this); 
     
    userRecord = new UserDataRecord(); 
     
    textEdit_name = new TextEdit(this); 
    textEdit_passwd = new TextEdit(this); 
    textEdit_passwd_re = new TextEdit(this); 
  } 
 
  public void show(Object[] args) { 
    // TODO Auto-generated method stub 
    setFullScreenMode(true); 
     
    object_name = ((String)args[0]!=null)?(String)args[0]:""; 
    editor = ((String)args[1]!=null)?(String)args[1]:""; 
    username = ((String)args[2]!=null)?(String)args[2]:""; 
    passwd = ((String)args[3]!=null)?(String)args[3]:""; 
    passwd_re = ((String)args[4]!=null)?(String)args[4]:""; 
     
    if(editor.equals("regist_name")) 
    { 
      cursorBlinkOn1 = true; 
      cursorBlinkOn2 = false; 
      cursorBlinkOn3 = false; 
      currentlySelectedIndex =0; 
    } 
    else if(editor.equals("regist_passwd")) 
    { 
      cursorBlinkOn1 = false; 
      cursorBlinkOn2 = true; 
      cursorBlinkOn3 = false; 
      currentlySelectedIndex =1; 
    } 
    else if(editor.equals("regist_passwd_re")) 
    { 
      cursorBlinkOn1 = false; 
      cursorBlinkOn2 = false; 
      cursorBlinkOn3 = true; 
      currentlySelectedIndex =2; 
    } 
     
    //System.out.println(object_name); 
    //System.out.println(editor); 
    draw(); 
    redraw(); 
  } 
 
  public void draw() 
  { 
    //clearScreen(); 
    backGroud.drawBackGroud(this, graphics); 
    head.drawHead(this,graphics,this.title); 
    menu.drawMenu(this,graphics,"下一步","退出"); 
    drawBody(); 
  } 
 
  private void redraw() 
  { 
    switch(currentlySelectedIndex) 
    { 
      case 0: 
      { 
        cursorBlinkOn2 = false; 
        cursorBlinkOn3 = false; 
        editor = "regist_name"; 
        break; 
      } 
      case 1: 
      { 
        cursorBlinkOn1 = false; 
        cursorBlinkOn3 = false; 
        editor = "regist_passwd"; 
        break; 
      } 
      case 2: 
      { 
        cursorBlinkOn1 = false; 
        cursorBlinkOn2 = false; 
        editor = "regist_passwd_re"; 
        break; 
      } 
      default:; 
    } 
     
    textEdit_name.drawTextBox(this, graphics, username, textEdit_name_x, textEdit_name_y, cursorBlinkOn1); 
    textEdit_passwd.drawTextBox(this, graphics, passwd, textEdit_passwd_x, textEdit_passwd_y, cursorBlinkOn2); 
    textEdit_passwd.drawTextBox(this, graphics, passwd_re, textEdit_passwd_re_x, textEdit_passwd_re_y, cursorBlinkOn3); 
    textEdit_name.flushGraphics(); 
  } 
 
  public void drawBody() 
  { 
    int margin =5; 
    ft = Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_BOLD,Font.SIZE_LARGE); 
     
    String info = "用戶名：\n"; 
    String info_wrap1[] = StringDealMethod.format(info, width-10, ft); 
     
    graphics.setFont(ft); 
    graphics.setColor(Color.text); 
    for(int i=0; i<info_wrap1.length; i++) 
    { 
      graphics.drawString(info_wrap1[i],5, (i) * ft.getHeight()+40, Graphics.TOP|Graphics.LEFT); 
    } 
     
    textEdit_name_x = 5; 
    textEdit_name_y = info_wrap1.length * ft.getHeight()+40; 
    textEdit_name.drawTextBox(this, graphics, username, textEdit_name_x, textEdit_name_y, cursorBlinkOn1); 
     
    info = "用戶密碼：\n"; 
    String info_wrap2[] = StringDealMethod.format(info, width-10, ft); 
   
    graphics.setFont(ft); 
    graphics.setColor(Color.text); 
    for(int i=0; i<info_wrap2.length; i++) 
    { 
      graphics.drawString(info_wrap2[i],5, (i+info_wrap1.length) * ft.getHeight()+textEdit_name.height+margin+40, Graphics.TOP|Graphics.LEFT); 
    } 
     
    textEdit_passwd_x = 5; 
    textEdit_passwd_y = (info_wrap1.length+info_wrap2.length) * ft.getHeight()+textEdit_name.height+margin+40; 
    textEdit_passwd.drawTextBox(this, graphics, passwd, textEdit_passwd_x, textEdit_passwd_y, cursorBlinkOn2); 
   
    info = "密碼確認：\n"; 
    String info_wrap3[] = StringDealMethod.format(info, width-10, ft); 
   
    graphics.setFont(ft); 
    graphics.setColor(Color.text); 
    for(int i=0; i<info_wrap3.length; i++) 
    { 
      graphics.drawString(info_wrap3[i],5, (i+info_wrap1.length+info_wrap2.length) * ft.getHeight()+textEdit_name.height+textEdit_passwd.height+2*margin+40, Graphics.TOP|Graphics.LEFT); 
    } 
     
    textEdit_passwd_re_x = 5; 
    textEdit_passwd_re_y = (info_wrap1.length+info_wrap2.length+info_wrap3.length) * ft.getHeight()+textEdit_name.height+textEdit_passwd.height+2*margin+40; 
    textEdit_passwd_re.drawTextBox(this, graphics, passwd_re, textEdit_passwd_re_x, textEdit_passwd_re_y, cursorBlinkOn3); 
   
     
  } 
 
  public void clearScreen() 
  { 
    graphics.setColor(0xff,0xff,0xff); 
    graphics.fillRect(0, 0, width, height); 
  } 
 
  public void checkTimeStamp() 
  { 
    long currentTime = System.currentTimeMillis(); 
    //System.out.println("1"); 
    if(lastCaretBlink + caretBlinkDelay < currentTime) 
    { 
      //System.out.println("2"); 
      if(editor.equals("regist_name")) 
      { 
        cursorBlinkOn1 =! cursorBlinkOn1; 
        cursorBlinkOn2 = false; 
        cursorBlinkOn3 = false; 
      } 
      else if(editor.equals("regist_passwd")) 
      { 
        cursorBlinkOn1 = false; 
        cursorBlinkOn2 =! cursorBlinkOn2; 
        cursorBlinkOn3 = false; 
      } 
      else if(editor.equals("regist_passwd_re")) 
      { 
        cursorBlinkOn1 = false; 
        cursorBlinkOn2 = false; 
        cursorBlinkOn3 =! cursorBlinkOn3; 
      } 
      lastCaretBlink = currentTime; 
    } 
  } 
 
  public void run() 
  { 
    //System.out.println("run"); 
    while(true) 
    { 
      checkTimeStamp(); 
       
      redraw(); 
      try  
      { 
        synchronized(this) 
        { 
          //System.out.println("3"); 
          wait(50L); 
        }       
      } 
      catch(Exception e) 
      { 
        e.printStackTrace(); 
      } 
       
    } 
  } 
 
  protected void keyPressed(int keyCode) 
  { 
    switch(keyCode) 
    { 
      case KeyID.SOFT_RIGHT: 
      { 
        controller.handleEvent(UIController.EventID.EVENT_EXIT,null); 
        break; 
      } 
      case KeyID.SOFT_LEFT: 
      { 
        if(username!="" && passwd!=""&&passwd_re!="") 
        { 
          if(passwd.equals(passwd_re)) 
          { 
             
             
            userRecord.db_deleteAllRecord(); 
            if(userRecord.db_getRecord(1)==null) 
            { 
              UserDataItem userItem = new UserDataItem(1,(username+","+passwd).getBytes()); 
              userRecord.db_addRecord(userItem); 
              userItem = null; 
              System.gc(); 
            } 
             
            String update = "start"; 
            Object [] args = {"activeScreen", null, update}; 
            controller.handleEvent(UIController.EventID.EVENT_NEXT_ACTIVE_TOKEN_SCREEN,args); 
          } 
        } 
        break; 
      } 
      case KeyID.KEY_EDIT: 
      case KEY_NUM0: 
      case KEY_NUM1: 
      case KEY_NUM2: 
      case KEY_NUM3: 
      case KEY_NUM4: 
      case KEY_NUM5: 
      case KEY_NUM6: 
      case KEY_NUM7: 
      case KEY_NUM8: 
      case KEY_NUM9: 
      { 
        //System.out.println(editor); 
        Object[] args = {object_name,editor,username,passwd,passwd_re}; 
        controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT,args); 
        break; 
      } 
      default:; 
    } 
       
    keyCode = getGameAction(keyCode); 
    switch(keyCode) 
    { 
      case UP: 
      case LEFT: 
      { 
        currentlySelectedIndex--; 
        if(currentlySelectedIndex<0) 
        { 
          currentlySelectedIndex=0; 
        } 
        else 
        { 
          redraw(); 
        } 
        break; 
      } 
      case DOWN: 
      case RIGHT: 
      { 
        currentlySelectedIndex++; 
        if(currentlySelectedIndex>2) 
        { 
          currentlySelectedIndex=2; 
        } 
        else 
        { 
          redraw(); 
        } 
         
        break; 
      } 
    } 
  } 
}

【分析】

1 文本框的繪制(TextEdit.java)

需要傳遞GameCanvas、Graphics對象，實現(xiàn)繪圖，策略是誰使用，誰傳遞該參數(shù)。此外需要床底文本框左上角坐標(x，y)以及控制光標閃爍的變量cursorBlinkOn。

public void drawTextBox(GameCanvas canvas, Graphics graphics, String text, int x, int y, boolean cursorBlinkOn) 
{ 
  //System.out.println("draw"); 
  int padding = 4; 
  int margin = 2; 
   
  ft = Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_PLAIN,Font.SIZE_MEDIUM); 
  graphics.setFont(ft); 
   
  width = 3*canvas.getWidth()/5+2*padding; 
  height = ft.getHeight()+2*padding; 
 
  graphics.setColor(Color.frame); 
  graphics.fillRect(x+1,y+1,width+margin,height+margin); 
     
  graphics.setColor(Color.frameBg); 
  graphics.drawRect(x, y,width, height); 
  graphics.setColor(Color.background); 
  graphics.fillRect(x+1, y+1,width-1,height-1); 
     
  graphics.setColor(Color.text); 
  graphics.drawString(text, x+padding, y+padding, Graphics.TOP|Graphics.LEFT); 
     
  drawCursor(graphics, x+ft.stringWidth(text)+padding, y+padding, 1, ft.getHeight(), cursorBlinkOn); 
     
  canvas.flushGraphics(x,y,width,height); 
}

2 繪制光標(TextEdit.java)

public void drawCursor(Graphics graphics, int x, int y, int width, int height, boolean cursorBlinkOn) 
{ 
  if(cursorBlinkOn) 
  { 
    ft = Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_PLAIN,Font.SIZE_MEDIUM); 
    graphics.setFont(ft); 
    graphics.setColor(0x0,0x0,0x0); 
    graphics.drawLine(x+width,y,x+width,y+height); 
  } 
}

3 實現(xiàn)光標閃爍

光標閃爍的實現(xiàn)需要用到線程，在UIController.java類中，需要繪制文本框的視圖類，需要實現(xiàn)線程接口。

UIController.java

case EventID.EVENT_NEXT_USER_REGIST_SCREEN: 
case EventID.EVENT_USER_REGIST_EDIT_BACK: 
{ 
      reg.show(args); 
      Thread thread = new Thread(reg); 
      thread.start(); 
      midlet.setCurrent(reg); 
      break; 
} 
UserRegist.java

public void checkTimeStamp() 
{ 
  long currentTime = System.currentTimeMillis(); 
  //System.out.println("1"); 
  if(lastCaretBlink + caretBlinkDelay < currentTime) 
  { 
    //System.out.println("2"); 
    if(editor.equals("regist_name")) 
    { 
      cursorBlinkOn1 =! cursorBlinkOn1; 
      cursorBlinkOn2 = false; 
      cursorBlinkOn3 = false; 
    } 
    else if(editor.equals("regist_passwd")) 
    { 
      cursorBlinkOn1 = false; 
      cursorBlinkOn2 =! cursorBlinkOn2; 
      cursorBlinkOn3 = false; 
    } 
    else if(editor.equals("regist_passwd_re")) 
    { 
      cursorBlinkOn1 = false; 
      cursorBlinkOn2 = false; 
      cursorBlinkOn3 =! cursorBlinkOn3; 
    } 
    lastCaretBlink = currentTime; 
  } 
} 
 
public void run() 
{ 
  //System.out.println("run"); 
  while(true) 
  { 
    checkTimeStamp(); 
     
    redraw(); 
    try  
    { 
      synchronized(this) 
      { 
        //System.out.println("3"); 
        wait(50L); 
      }       
    } 
    catch(Exception e) 
    { 
      e.printStackTrace(); 
    } 
       
  } 
}

4 調用高級界面TextBox子類PopUpTextBox

調用時，將調用對象名、編輯對象名、以及編輯框參數(shù)傳遞給PopUpTextBox對象(一定要有，目的是保存編輯框的值，否則多次調用返回時，不同編輯框的值被刷新為空了)

UserRegist.java(KeyPressed)

case KeyID.KEY_EDIT: 
case KEY_NUM0: 
case KEY_NUM1: 
case KEY_NUM2: 
case KEY_NUM3: 
case KEY_NUM4: 
case KEY_NUM5: 
case KEY_NUM6: 
case KEY_NUM7: 
case KEY_NUM8: 
case KEY_NUM9: 
{ 
  //System.out.println(editor); 
  Object[] args = {object_name,editor,username,passwd,passwd_re}; 
  controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT,args); 
  break; 
} 
UIController.java

case EventID.EVENT_USER_REGIST_EDIT: 
{ 
   textBox.init(args); 
     midlet.setCurrent(textBox); 
   break; 
}

5 PopUpTextBox參數(shù)的接收

public void init(Object[] args) 
{ 
   object_name = ((String)args[0]!=null)?(String)args[0]:""; 
   editor = ((String)args[1]!=null)?(String)args[1]:""; 
   //System.out.println(object_name); 
   //System.out.println(editor); 
   args_t = args; 
   this.setString(""); 
}

6 PopUpTextBox返回輸入法輸入的值

if (update) canvasText = this.getString();
7 PopUpTextBox輸入值處理

依據(jù)調用的對象，以及編輯對象，對輸入的值進行處理，傳遞給父對象編輯框

if(object_name.equals("registScreen")) 
{ 
    if(editor.equals("regist_name")) 
    { 
        if(args_t[3]!=""||args_t[3]!=null||args_t[4]!=""||args_t[4]!=null) 
        { 
          args[0] = object_name; 
          args[1] = editor; 
          args[2] = this.canvasText; 
          args[3] = args_t[3]; 
          args[4] = args_t[4]; 
        } 
        controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args); 
  } 
  else if(editor.equals("regist_passwd")) 
  { 
        if(args_t[2]!=""||args_t[2]!=null||args_t[4]!=""||args_t[4]!=null) 
        { 
          args[0] = object_name; 
          args[1] = editor; 
          args[2] = args_t[2]; 
          args[3] = this.canvasText; 
          args[4] = args_t[4]; 
        } 
        controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args); 
  } 
  else if(editor.equals("regist_passwd_re")) 
  { 
        if(args_t[2]!=""||args_t[2]!=null||args_t[3]!=""||args_t[3]!=null) 
        { 
          args[0] = object_name; 
          args[1] = editor; 
          args[2] = args_t[2]; 
          args[3] = args_t[3]; 
          args[4] = this.canvasText; 
        } 
        controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args); 
  } 
}

8 輸入值的顯示

(1) 新建對象

private TextEdit textEdit_name; 
textEdit_name = new TextEdit(this);

(2) 接受輸入的參數(shù)

object_name = ((String)args[0]!=null)?(String)args[0]:""; 
editor = ((String)args[1]!=null)?(String)args[1]:""; 
username = ((String)args[2]!=null)?(String)args[2]:""; 
passwd = ((String)args[3]!=null)?(String)args[3]:""; 
passwd_re = ((String)args[4]!=null)?(String)args[4]:"";

(3) 光標控制，定位到編輯對象，控制編輯對象的光標閃爍(run方法)

private void redraw() 
{ 
  switch(currentlySelectedIndex) 
  { 
    case 0: 
    { 
      cursorBlinkOn2 = false; 
      cursorBlinkOn3 = false; 
      editor = "regist_name"; 
      break; 
    } 
    case 1: 
    { 
      cursorBlinkOn1 = false; 
      cursorBlinkOn3 = false; 
      editor = "regist_passwd"; 
      break; 
    } 
    case 2: 
    { 
      cursorBlinkOn1 = false; 
      cursorBlinkOn2 = false; 
      editor = "regist_passwd_re"; 
      break; 
    } 
    default:; 
  } 
//... 
 
}

(4) 編輯框的繪制

private void redraw() 
{ 
  ...    
  textEdit_name.drawTextBox(this, graphics, username, textEdit_name_x, textEdit_name_y, cursorBlinkOn1); 
  textEdit_passwd.drawTextBox(this, graphics, passwd, textEdit_passwd_x, textEdit_passwd_y, cursorBlinkOn2); 
  textEdit_passwd.drawTextBox(this, graphics, passwd_re, textEdit_passwd_re_x, textEdit_passwd_re_y, cursorBlinkOn3); 
  textEdit_name.flushGraphics(); 
}

實現(xiàn)的效果如圖1所示：

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