QLabel、QLineEdit、QTextEdit

QLabel控件基本用法

'''
QLabel控件

setAlignment()：设置文本的对齐方式

setIndent()：设置文本缩进

text()：获取文本内容

setBuddy()：设置伙伴关系

setText()：设置文本内容

selectedText()：返回所选择的字符

setWordWrap()：设置是否允许换行

QLabel常用的信号（事件）：
1.  当鼠标滑过QLabel控件时触发：linkHovered
2.  当鼠标单击QLabel控件时触发：linkActivated

'''

import sys
from PyQt5.QtWidgets import QVBoxLayout,QMainWindow,QApplication,QLabel,QWidget
from PyQt5.QtGui import QPixmap, QPalette
from PyQt5.QtCore import Qt

class QLabelDemo(QWidget) :
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        label1 = QLabel(self)
        label2 = QLabel(self)
        label3 = QLabel(self)
        label4 = QLabel(self)

        label1.setText("<font color=yellow>这是一个文本标签.</font>")
        label1.setAutoFillBackground(True)
        palette = QPalette()
        palette.setColor(QPalette.Window,Qt.blue)  # 设置背景色
        label1.setPalette(palette)
        label1.setAlignment(Qt.AlignCenter)

        label2.setText("<a href='#'>欢迎使用Python  GUI程序</a>")

        label3.setAlignment(Qt.AlignCenter)

        label3.setToolTip('这是一个图片标签')

        label3.setPixmap(QPixmap("./images/python.jpg"))
        # 如果设为True，用浏览器打开网页，如果设为False，调用槽函数
        label4.setOpenExternalLinks(True)

        label4.setText("<a href='https://item.jd.com/12417265.html'>感谢关注《Python从菜鸟到高手》</a>")

        label4.setAlignment(Qt.AlignRight)

        label4.setToolTip('这是一个超级链接')

        vbox = QVBoxLayout()

        vbox.addWidget(label1)
        vbox.addWidget(label2)
        vbox.addWidget(label3)
        vbox.addWidget(label4)


        label2.linkHovered.connect(self.linkHovered)

        label4.linkActivated.connect(self.linkClicked)

        self.setLayout(vbox)
        self.setWindowTitle('QLabel控件演示')

    def linkHovered(self):
        print('当鼠标滑过label2标签时，触发事件')

    def linkClicked(self):
        print('当鼠标单击label4标签时，触发事件')

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

QLabel控件与伙伴控件

'''

QLabel与伙伴控件

mainLayout.addWidget(控件对象,rowIndex,columnIndex,row,column)

'''

from PyQt5.QtWidgets import *
import sys

class QLabelBuddy(QDialog) :
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('QLabel与伙伴控件')

        nameLabel = QLabel('&Name',self)
        nameLineEdit = QLineEdit(self)
        # 设置伙伴控件
        nameLabel.setBuddy(nameLineEdit)

        passwordLabel = QLabel('&Password',self)
        passwordLineEdit = QLineEdit(self)
        # 设置伙伴控件
        passwordLabel.setBuddy(passwordLineEdit)

        btnOK = QPushButton('&OK')
        btnCancel = QPushButton('&Cancel')

        mainLayout = QGridLayout(self)
        mainLayout.addWidget(nameLabel,0,0)
        mainLayout.addWidget(nameLineEdit,0,1,1,2)

        mainLayout.addWidget(passwordLabel,1,0)
        mainLayout.addWidget(passwordLineEdit,1,1,1,2)

        mainLayout.addWidget(btnOK,2,1)
        mainLayout.addWidget(btnCancel,2,2)

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

---

QLineEdit控件与回显模式

'''

QLineEdit控件与回显模式

基本功能：输入单行的文本

EchoMode（回显模式）

4种回显模式

1. Normal
2. NoEcho
3. Password
4. PasswordEchoOnEdit


Mac : Command    Windows:Control
'''
from PyQt5.QtWidgets import *
import sys

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

    def initUI(self):
        self.setWindowTitle('文本输入框的回显模式')

        formLayout = QFormLayout()

        normalLineEdit = QLineEdit()
        noEchoLineEdit = QLineEdit()
        passwordLineEdit = QLineEdit()
        passwordEchoOnEditLineEdit = QLineEdit()

        formLayout.addRow("Normal",normalLineEdit)
        formLayout.addRow("NoEcho", noEchoLineEdit)
        formLayout.addRow("Password",passwordLineEdit)
        formLayout.addRow("PasswordEchoOnEdit",passwordEchoOnEditLineEdit)

        # placeholdertext

        normalLineEdit.setPlaceholderText("Normal")
        noEchoLineEdit.setPlaceholderText("NoEcho")
        passwordLineEdit.setPlaceholderText("Password")
        passwordEchoOnEditLineEdit.setPlaceholderText("PasswordEchoOnEdit")

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

        self.setLayout(formLayout)

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

QLineEdit控件输入校验器

'''

现在QLineEdit控件的输入（校验器）

如限制只能输入整数、浮点数或满足一定条件的字符串


'''

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

class QLineEditValidator(QWidget):
    def __init__(self):
        super(QLineEditValidator,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',validatorLineEdit)

        intLineEdit.setPlaceholderText('整型')
        doubleLineEdit.setPlaceholderText('浮点型')
        validatorLineEdit.setPlaceholderText('字母和数字')

        # 整数校验器 [1,99]
        intValidator = QIntValidator(self)
        intValidator.setRange(1,99)

        # 浮点校验器 [-360,360]，精度：小数点后2位
        doubleValidator = QDoubleValidator(self)
        doubleValidator.setRange(-360,360)
        doubleValidator.setNotation(QDoubleValidator.StandardNotation)
        # 设置精度，小数点2位
        doubleValidator.setDecimals(2)

        # 字符和数字
        reg = QRegExp('[a-zA-z0-9]+$')
        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 = QLineEditValidator()
    main.show()
    sys.exit(app.exec_())

QLineEdit掩码限制输入

'''

用掩码限制QLineEdit控件的输入

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
'''

from PyQt5.QtWidgets import *
import sys

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()
        # 192.168.21.45
        ipLineEdit.setInputMask('000.000.000.000;_')
        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_())

QLineEdit综合案例

'''

QLineEdit综合案例

'''

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

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

    def initUI(self):
        edit1 = QLineEdit()
        # 使用int校验器
        edit1.setValidator(QIntValidator())
        edit1.setMaxLength(4)  # 不超过9999
        edit1.setAlignment(Qt.AlignRight)
        edit1.setFont(QFont('Arial',20))

        edit2 = QLineEdit()
        edit2.setValidator(QDoubleValidator(0.99,99.99,2))

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

        edit4 = QLineEdit()
        edit4.textChanged.connect(self.textChanged)

        edit5 = QLineEdit()
        edit5.setEchoMode(QLineEdit.Password)
        edit5.editingFinished.connect(self.enterPress)

        edit6 = QLineEdit('Hello PyQt5')
        edit6.setReadOnly(True)


        formLayout = QFormLayout()
        formLayout.addRow('整数校验',edit1)
        formLayout.addRow('浮点数校验',edit2)
        formLayout.addRow('Input Mask',edit3)
        formLayout.addRow('文本变化', edit4)
        formLayout.addRow('密码',edit5)
        formLayout.addRow('只读',edit6)
        self.setLayout(formLayout)
        self.setWindowTitle('QLineEdit综合案例')
    def textChanged(self,text):
        print('输入的内容：' + text)

    def enterPress(self):
        print('已输入值')
if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QLineEditDemo()
    main.show()
    sys.exit(app.exec_())

---

QTextEdit输入多行文本

'''

QTextEdit控件

'''

from PyQt5.QtWidgets import *
import sys

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

    def initUI(self):
        self.setWindowTitle('QTextEdit控件演示')

        self.resize(300,320)

        self.textEdit = QTextEdit()
        self.buttonText = QPushButton('显示文本')
        self.buttonHTML = QPushButton('显示HTML')

        self.buttonToText = QPushButton('获取文本')
        self.buttonToHTML = QPushButton('获取HTML')


        layout = QVBoxLayout()
        layout.addWidget(self.textEdit)
        layout.addWidget(self.buttonText)
        layout.addWidget(self.buttonToText)
        layout.addWidget(self.buttonHTML)
        layout.addWidget(self.buttonToHTML)

        self.setLayout(layout)

        self.buttonText.clicked.connect(self.onClick_ButtonText)
        self.buttonHTML.clicked.connect(self.onClick_ButtonHTML)

        self.buttonToText.clicked.connect(self.onClick_ButtonToText)
        self.buttonToHTML.clicked.connect(self.onClick_ButtonToHTML)

    def onClick_ButtonText(self):
        self.textEdit.setPlainText('Hello World，世界你好吗？')

    def onClick_ButtonToText(self):
        print(self.textEdit.toPlainText())

    def onClick_ButtonHTML(self):
        self.textEdit.setHtml('<font color="blue" size="5">Hello World</font>')
    def onClick_ButtonToHTML(self):
        print(self.textEdit.toHtml())

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