//单例模式
    static NumberKeyboard * getInstance();
    //显示输入缓存区
    void showInputBufferArea(QString inputContent=QString(),const QValidator *validator=NULL);
    //隐藏输入缓存区
    void hideInputBufferArea(QLineEdit *currLineEdit,bool autoMovePos = true);
    //计算数字小键盘显示的位置
    QPoint calcNumberKeyboardPos(QWidget *inputWidget);