Qt QLineEdit 限制输入类型以及大小Int 和double

http://blog.csdn.net/a_sungirl/article/details/17373405

1.QLineEdit 限制整数

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1. m_LineEditIterate = new QLineEdit();  
2. m_LineEditIterate->setFixedWidth(100);  
3. m_LineEditIterate->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);  
4. m_LineEditIterate->setText("2");  
5. 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,

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

3.QLineEdit只输入字母和数字 收藏

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