PyQt5基本窗口控件-----QLineEdit

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QLineEdit类是一个单行文本控件，可输入单行字符串，可以设置回显模式(Echomode)和掩码模式

1. 回显模式(Echomode)
回显模式就是当键盘被按下后，显示了什么

• Normal 正常的回显模式
• NoEcho 不回显模式(什么都没出现)
• Password 密码
• PasswordEchoOnEdit 先是显示，然后过了几秒就不显示

import sys
from PyQt5.QtWidgets import *

class QLineEditEchoMode(QWidget):
    def __init__(self):
        super(QLineEditEchoMode, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('文本框的回显模式')

        formLayout = QFormLayout()

        normalLineEdit = QLineEdit()
        noEchoLineEdit = QLineEdit()
        passwordLineEdit = QLineEdit()
        passwordEchoOnLineEdit = QLineEdit()

        formLayout.addRow("Normal", normalLineEdit)
        formLayout.addRow("noEcho", noEchoLineEdit)
        formLayout.addRow("password", passwordLineEdit)
        formLayout.addRow("passwordEchoOnEdit", passwordEchoOnLineEdit)

        # placeoldertext  文本输入框内的灰色提示
        normalLineEdit.setPlaceholderText("Normal")
        noEchoLineEdit.setPlaceholderText("noEcho")
        passwordLineEdit.setPlaceholderText("password")
        passwordEchoOnLineEdit.setPlaceholderText("passwordEchoOnEdit")

        normalLineEdit.setEchoMode(QLineEdit.Normal)
        noEchoLineEdit.setEchoMode(QLineEdit.NoEcho)
        passwordLineEdit.setEchoMode(QLineEdit.Password)
        passwordEchoOnLineEdit.setEchoMode(QLineEdit.PasswordEchoOnEdit)

        self.setLayout(formLayout)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QLineEditEchoMode()
    main.show()
    sys.exit(app.exec_())

2. 校验器
比如只能限制输入整数或满足一定条件的字符串

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import QIntValidator, QDoubleValidator, QRegExpValidator
from PyQt5.QtCore import QRegExp

class QLineEditValiddator(QWidget):
    def __init__(self):
        super(QLineEditValiddator, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('校验器')

        # 创建表单布局
        formLayout = QFormLayout()

        intLineEdit = QLineEdit()
        DoubleLineEdit = QLineEdit()
        validatorLineEdit = QLineEdit()

        formLayout.addRow('整数类型', intLineEdit)
        formLayout.addRow('浮点类型', DoubleLineEdit)
        formLayout.addRow('数字和字母类型', validatorLineEdit)

        intLineEdit.setPlaceholderText('整形')
        DoubleLineEdit.setPlaceholderText('浮点型')
        validatorLineEdit.setPlaceholderText('字母和数字')

        # 整数校验器
        # 创建一个校验器
        intValidator = QIntValidator(self)
        # 设置范围
        intValidator.setRange(1, 99)

        # 浮点校验器
        # 创建一个校验器
        doubleValidator = QDoubleValidator(self)
        # 设置范围
        doubleValidator.setRange(-360, 360)
        # 设置精度
        doubleValidator.setNotation(QDoubleValidator.StandardNotation)
        doubleValidator.setDecimals(2)

        # 字符和数字校验器
        reg = QRegExp('[a-zA-Z0-9]+$')
        # 创建一个校验器
        validator = QRegExpValidator(self)
        validator.setRegExp(reg)

        # 设置校验器
        intLineEdit.setValidator(intValidator)
        DoubleLineEdit.setValidator(doubleValidator)
        validatorLineEdit.setValidator(validator)

        self.setLayout(formLayout)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QLineEditValiddator()
    main.show()
    sys.exit(app.exec_())

3. 掩码
要限制用户的输入，除了刚刚的校验器外，还有掩码，比如在修改IP时，这个就是掩码

A    ASCII字母字符是必须输入的(A-Z、a-z)
a    ASCII字母字符是允许输入的,但不是必需的(A-Z、a-z)
N    ASCII字母字符是必须输入的(A-Z、a-z、0-9)
n    ASII字母字符是允许输入的,但不是必需的(A-Z、a-z、0-9)
X    任何字符都是必须输入的
x    任何字符都是允许输入的,但不是必需的
9    ASCII数字字符是必须输入的(0-9)
0    ASCII数字字符是允许输入的,但不是必需的(0-9)
D    ASCII数字字符是必须输入的(1-9)
d    ASCII数字字符是允许输入的,但不是必需的(1-9)
#    ASCI数字字符或加减符号是允许输入的,但不是必需的
H    十六进制格式字符是必须输入的(A-F、a-f、0-9)
h    十六进制格式字符是允许输入的,但不是必需的(A-F、a-f、0-9)
B    二进制格式字符是必须输入的(0,1)
b    二进制格式字符是允许输入的,但不是必需的(0,1)
>    所有的字母字符都大写
<    所有的字母字符都小写
!    关闭大小写转换
\    使用"\"转义上面列出的字符

import sys
from PyQt5.QtWidgets import *

class QLineEditMask(QWidget):
    def __init__(self):
        super(QLineEditMask, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('用掩码限制QLineEdit控件的输入')
        formlayout = QFormLayout()

        ipLineEdit = QLineEdit()
        macLineEdit = QLineEdit()
        dateLineEdit = QLineEdit()
        licenseLineEdit = QLineEdit()

        ipLineEdit.setInputMask('000.000.000.000;_')  # 没有输入时就显示成下划线
        macLineEdit.setInputMask('HH:HH:HH:HH:HH:HH;_')
        dateLineEdit.setInputMask('0000-00-00')
        licenseLineEdit.setInputMask('>AAAAA-AAAAA-AAAAA-AAAAA-AAAAA;#')

        formlayout.addRow('数字掩码', ipLineEdit)
        formlayout.addRow('Mac掩码', macLineEdit)
        formlayout.addRow('日期掩码', dateLineEdit)
        formlayout.addRow('许可证掩码', licenseLineEdit)

        self.setLayout(formlayout)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QLineEditMask()
    main.show()
    sys.exit(app.exec_())

4. Demo

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import Qt

class QLineEditDemo(QWidget):
    def __init__(self):
        super(QLineEditDemo, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('DEMO')

        edit1 = QLineEdit()
        # 使用int校验器
        edit1.setValidator(QIntValidator())
        # 设置最大长度，不超过4位的int
        edit1.setMaxLength(4)
        # 设置文本对齐格式
        edit1.setAlignment(Qt.AlignRight)
        # 设置字体和大小
        edit1.setFont(QFont('Arial', 20))

        # 设置浮点数校验
        edit2 = QLineEdit()
        edit2.setValidator(QDoubleValidator(0.99, 99.99, 2))

        # 设置掩码
        edit3 = QLineEdit()
        edit3.setInputMask('99_9999_999999;#')

        # 绑定信号槽，显示文本变化
        edit4 = QLineEdit()
        edit4.textChanged.connect(self.textChanged)

        # 设置回显password
        edit5 = QLineEdit()
        edit5.setEchoMode(QLineEdit.Password)
        edit5.editingFinished.connect(self.enterPress)

        # 设为只读
        edit6 = QLineEdit("hello pyqt5")
        edit6.setReadOnly(True)

        formlayout = QFormLayout()
        formlayout.addRow('整形校验', edit1)
        formlayout.addRow('浮点数校验', edit2)
        formlayout.addRow('Input Mask校验', edit3)
        formlayout.addRow('文本变化', edit4)
        formlayout.addRow('密码', edit5)
        formlayout.addRow('只读', edit6)

        self.setLayout(formlayout)

    def textChanged(self, text):
        print("输出的内容" + text)

    def enterPress(self):
        print("已输入值")


if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QLineEditDemo()
    main.show()
    sys.exit(app.exec_())