验证器

 1 """验证器"""
 2 import sys
 3 from PyQt5.QtWidgets import QApplication, QLineEdit, QWidget, QFormLayout
 4 from PyQt5.QtGui import QIntValidator, QDoubleValidator, QRegExpValidator
 5 from PyQt5.QtCore import QRegExp
 6 
 7 
 8 class lineEditDemo(QWidget):
 9     def __init__(self):
10         super().__init__()
11         self.setWindowTitle("QLineEdit例子")
12 
13         flo = QFormLayout()
14         pIntLineEdit = QLineEdit()
15         pDoubleLineEdit = QLineEdit()
16         pValidatorLineEdit = QLineEdit()
17 
18 
19         flo.addRow("整型", pIntLineEdit)
20         flo.addRow("浮点型", pDoubleLineEdit)
21         flo.addRow("字母和数字", pValidatorLineEdit)
22 
23         pIntLineEdit.setPlaceholderText("整型")
24         pDoubleLineEdit.setPlaceholderText("浮点型")
25         pValidatorLineEdit.setPlaceholderText("字母和数字")
26 
27         # 整形，范围:[1,99]
28         pIntValidator = QIntValidator(self)
29         pIntValidator.setRange(1, 99)
30 
31         # 浮点型范围[-360, 360],精度小数点后两位
32         pDoubleValidator = QDoubleValidator(self)
33         pDoubleValidator.setRange(-360, 360)
34         pDoubleValidator.setNotation(QDoubleValidator.StandardNotation)
35         pDoubleValidator.setDecimals(2)
36 
37         # 字母和数字
38         reg = QRegExp("[a-zA-Z0-9]+ $")
39         pValidator = QRegExpValidator(self)
40         pValidator.setRegExp(reg)
41 
42         # 设置验证器
43         pIntLineEdit.setValidator(pIntValidator)
44         pDoubleLineEdit.setValidator(pDoubleValidator)
45         pValidatorLineEdit.setValidator(pValidator)
46 
47 
48         self.setLayout(flo)
49 
50 if __name__ == '__main__':
51     app = QApplication(sys.argv)
52     win = lineEditDemo()
53     win.show()
54     sys.exit(app.exec_())