Qt QLineEdit 限制输入类型以及大小Int 和double

1.QLineEdit 限制整数

m_LineEditIterate = new QLineEdit();
m_LineEditIterate->setFixedWidth(100);
m_LineEditIterate->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
m_LineEditIterate->setText("2");
m_LineEditIterate->setValidator(new QIntValidator(1, 9, m_LineEditIterate));

2. QLieEdit限制double类型,以及小数点,{0,2}这个是控制位数,

QRegExp double_rx100("100|([0-9]{0,2}[\.][0-9]{1,3})"); 
QRegExp double_rx10000("10000|([0-9]{0,4}[\.][0-9]{1,3})"); 
QRegExp double_rx10("10|([0-9]{0,1}[\.][0-9]{1,3})"); 
m_LineEditDensity = new QLineEdit;
m_LineEditDensity->setValidator(new QRegExpValidator(double_rx100, m_LineEditDensity));
m_LineEditParA = new QLineEdit;
m_LineEditParA->setValidator(new QRegExpValidator(double_rx10000, m_LineEditParA));
m_LineEditParB = new QLineEdit;
m_LineEditParB->setValidator(new QRegExpValidator(double_rx10, m_LineEditParB));

3.QLineEdit只输入字母和数字 收藏

QRegExp regx("[a-zA-Z0-9]+$");
QValidator *validator = new QRegExpValidator(regx, lined );
lined->setValidator( validator );