Pyqt control part (I)

Common simple controls （ One ）

LineEdit： Single line text box
TextEdit： Multi-line text box
SpinBox： Integer numeric selection control
DoubleSpinBox： Decimal number selection control
LCDNumber： LCD digital display control
PushButton： Button
CommandLinkButton： Command link button
RedioButton： Radio button
CheckBox： Check box

LineEdit Control will emit editingFinshed The signal .（ Send at the end of text box editing ）

SpinBox Control will emit valueChange The signal . （ At Click SpinBox Send when the up and down arrows of the control ）
DoubleSpinBox ditto

PushButton Control will emit clicked The signal .（ The signal is emitted when the button is clicked ）

RadioButton Control will emit clicked and toggled The signal .
clicked The signal ： Each click emits clicked The signal .
toggled The signal ： Only when the state of the radio button changes toggled The signal .

CheckBox Control will emit stateChange The signal （ Emit when the state of the check box changes ）
 

Control sends a signal binding method Key code by ：

self. Control object name . Signal name .connect( Method )                                                                                Method without parentheses , Because we want the control to bind methods , Not the result of binding methods .（ Adding parentheses after a method will automatically execute the method ）

example ：

self.doubleSpinBox.valueChanged.connect(self.getvalue_2)

Use of the above controls , I wrote it in the program .

label.py For window program ,label_main.py It's the main function .

First show the main function ：

label_main.py:

from label import Ui_MainWindow
from PyQt5 import QtWidgets

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

Then show the window program ：

label.py:

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'label.ui'
#
# Created by: PyQt5 UI code generator 5.15.4
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        #  Control -- Text （label）
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(240, 210, 111, 51))
        self.label.setObjectName("label")
        #  Control -- Single line text box （lineEidt）
        self.lineEidt = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEidt.setGeometry(QtCore.QRect(300, 220, 111, 31))
        self.lineEidt.setObjectName("lineEidt")
        self.lineEidt.setEchoMode(QtWidgets.QLineEdit.Password)         #  Set to password mode , Hide the input characters 
        self.lineEidt.setValidator(QtGui.QIntValidator(10000, 99999))   #  Settings can only be entered 5 Digit number 
        #  Control -- Multi-line text box （TextEdit）
        self.TextEidt = QtWidgets.QTextEdit(self.centralwidget)
        self.TextEidt.setGeometry(QtCore.QRect(300,260,111,111))
        self.TextEidt.setObjectName("TextEidt")
        #  Control -- Integer numeric selection control （SpinBox）
        self.SpinBox = QtWidgets.QSpinBox(self.centralwidget)
        self.SpinBox.setGeometry(QtCore.QRect(300,450,100,22))
        self.SpinBox.setObjectName("SpinBox")           #  Half of the usage settings are set
        self.SpinBox.setMinimum(0)      #  Set minimum 
        self.SpinBox.setMaximum(9)      #  Set maximum 
        self.SpinBox.setSingleStep(2)   #  Set step size 
        #  Control -- Decimal number selection control （DoubleSpinBox）
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(400, 510, 130, 100))
        self.label_2.setObjectName("label")
        self.label_2.setText(" Show numbers :0.000")

        self.doubleSpinBox = QtWidgets.QDoubleSpinBox(self.centralwidget)
        self.doubleSpinBox.setGeometry(QtCore.QRect(300,550,100,22))
        self.doubleSpinBox.setObjectName("doubleSpinBox")
        self.doubleSpinBox.setMinimum(0)        #  Set minimum 
        self.doubleSpinBox.setMaximum(9.999)    #  Set maximum 
        self.doubleSpinBox.setSingleStep(0.001) #  Set step size 
        self.doubleSpinBox.setDecimals(3)       #  Set to retain unit decimal 
        self.doubleSpinBox.valueChanged.connect(self.getvalue_2)
        #  LCD digital display control （LCDNumber）
        self.lineEidt_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEidt_2.setGeometry(QtCore.QRect(100, 50, 80, 30))
        self.lineEidt_2.setObjectName("lineEidt")

        self.lcdNumber = QtWidgets.QLCDNumber(self.centralwidget)
        self.lcdNumber.setGeometry(QtCore.QRect(100,100,150,80))
        self.lcdNumber.setObjectName('lcdNumber')
        self.lcdNumber.setDigitCount(5)     #  Set the maximum display 5 Digit number 
        self.lcdNumber.setMode(QtWidgets.QLCDNumber.Dec)    #  Set the default to display numbers in decimal 
        self.lcdNumber.setSegmentStyle(QtWidgets.QLCDNumber.Flat)   #  Set the display style of the digital display Flat
        self.lcdNumber.setProperty("value", 2)      #  Set properties --value attribute -- value -- by 2
        self.lineEidt_2.editingFinished.connect(self.setvalue_1)
        #  Command link button (CommandLinkButton)
        self.commandLinkButton = QtWidgets.QCommandLinkButton(self.centralwidget)
        self.commandLinkButton.setGeometry(QtCore.QRect(200, 50, 300, 50))
        self.commandLinkButton.setObjectName("commandLinkButton")
        self.commandLinkButton.setText("http://www.4399.com")
        # label- Hyperlinks 
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setGeometry(QtCore.QRect(200, 25, 200, 50))
        self.label_3.setObjectName("label_3")
        self.label_3.setWordWrap(True)      #  Set up label Text can be wrapped 
        #  Use HTML Medium <a> Label set hyperlink text 
        self.label_3.setText(" Hyperlink text ：<a href='http://www.4399.com'>4399 Little games </a>")
        self.label_3.setOpenExternalLinks(True)     #  Set up to access hyperlinks 
        #  Radio button （RadioButton）
        self.radioButton = QtWidgets.QRadioButton(self.centralwidget)
        self.radioButton.setGeometry(QtCore.QRect(300, 100, 80, 50))
        self.radioButton.setObjectName("radioButton")
        self.radioButton.setText(" choice A")
        self.radioButton_2 = QtWidgets.QRadioButton(self.centralwidget)
        self.radioButton_2.setGeometry(QtCore.QRect(380, 100, 80, 50))
        self.radioButton_2.setObjectName("radioButton_2")
        self.radioButton_2.setText(" choice B")
        self.radioButton.toggled.connect(self.select_radioButton)
        #  Check box （CheckBox）
        self.checkBox = QtWidgets.QCheckBox(self.centralwidget)
        self.checkBox.setGeometry(QtCore.QRect(450, 50, 80, 30))
        self.checkBox.setObjectName("checkBox")
        self.checkBox.setText("A. Basketball ")
        self.checkBox_2 = QtWidgets.QCheckBox(self.centralwidget)
        self.checkBox_2.setGeometry(QtCore.QRect(450, 70, 80, 30))
        self.checkBox_2.setObjectName("checkBox_2")
        self.checkBox_2.setText("B. football ")
        self.checkBox_3 = QtWidgets.QCheckBox(self.centralwidget)
        self.checkBox_3.setGeometry(QtCore.QRect(450, 90, 90, 30))
        self.checkBox_3.setObjectName("checkBox_3")
        self.checkBox_3.setText("C. Table Tennis ")
        #  Button （PushButton）
        self.pushBotton = QtWidgets.QPushButton(self.centralwidget)
        self.pushBotton.setGeometry(QtCore.QRect(450,10,100,30))
        self.pushBotton.setObjectName("pushBotton")
        self.pushBotton.setText(' Check box options ')
        self.pushBotton.clicked.connect(self.getvalue)

        MainWindow.setCentralWidget(self.centralwidget)


        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))
        self.menubar.setNativeMenuBar(True)
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setEnabled(True)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)


    def setvalue_1(self):
        self.lcdNumber.setProperty("value", self.lineEidt_2.text()) #  Set the displayed value to the value entered in the text box 

    def getvalue_2(self):

        self.label_2.setText(" Show numbers :{0:.3f}".format(self.doubleSpinBox.value()))
        print(self.doubleSpinBox.value())
        print(self.label_2.text())

    def select_radioButton(self):
        if self.radioButton.isChecked():        #  choice A when , Output A
            print('A')
        elif self.radioButton_2.isChecked():    #  choice B Time output B
            print('B')

    def getvalue(self):

        text = ""   #  Set an empty string -- The character used to receive the check box 
        if self.checkBox.isChecked():
            text += self.checkBox.text()
        if self.checkBox_2.isChecked():
            text += '\n' + self.checkBox_2.text()
        if self.checkBox_3.isChecked():
            text += '\n' + self.checkBox_3.text()
        if text == '':
            text = ' nothing '
        from PyQt5.QtWidgets import QMessageBox  #  Used to pop up the prompt box 
        QMessageBox.information(QtWidgets.QMainWindow(), ' Tips ', text, QMessageBox.Ok)

    # def messageBox_xianshi(self, MainWindow):


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        # self.label.setText(_translate("MainWindow", " user name ："))
        self.label.setText(" Single line text box ：")
        # from PyQt5.QtGui import QPixmap
        # self.label.setPixmap(QPixmap('E:/dahai.jpeg'))

Result display ：

Decimal number selection control , And the one on its right label Text control binding .

  LCD digital display is also similar to the one on it LineEdit Single line text box control binding .

  And radio buttons , It will output... On the console A and B character .

And a single check box and button binding , You can pop up a prompt box to display the text of the check box option .

 

  These are some simple controls , Of course, there are many controls , I will continue to write later ！