(6) Pyqt5--- > window jump (registration login function)

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Another way to connect signals and slots was mentioned in the previous article

This blog was originally 2020 It should be released by the end of the year , Until now ！ In the spare time of review , It's really enjoyable to be able to write something comfortable

This time, the main content is the interface jump to realize the login function

My method is clumsy , But it works . In fact, as long as one thing is completed, it will be completely OK 了 ： When your login button is click When time is triggered , The slot function you connect to should be your own login API, Of course, this time I use the login interface function of my own server , When you use it, change it to your own login API Can , Come back , If you're successful , You need to send messages to each of the two interfaces , Make the action of closing this window and opening a new one , I'm used to writing slot functions in my own class , In this way, you can't pass information to another window object （ I haven't thought of a good way for the time being ）, So I write this slot function directly in the main thread , Then the button binding event is also bound after the slot function .

I used to write tkinter That's what I did when I was young , There's nothing wrong at the moment , It can be said to be simple and rude

This code file mainly has

• login_ui.py
• main_ui.py
• main.py

The first two are ui Turning around py file ,main.py A file is a file in which a program runs

If you don't want to go GitHub If you download the code above , I just posted it

login_ui.py

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

# Form implementation generated from reading ui file 'login.ui'
#
# Created by: PyQt5 UI code generator 5.15.2
#
# 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_login(object):
    def setupUi(self, login):
        login.setObjectName("login")
        #login.setStyleSheet("#login{background-color:green}")
        login.resize(412, 269)
        self.id_label = QtWidgets.QLabel(login)
        self.id_label.setGeometry(QtCore.QRect(110, 60, 51, 41))
        font = QtGui.QFont()
        font.setFamily("Agency FB")
        font.setPointSize(14)
        self.id_label.setFont(font)
        self.id_label.setObjectName("id_label")
        self.pw_label_2 = QtWidgets.QLabel(login)
        self.pw_label_2.setGeometry(QtCore.QRect(110, 120, 51, 41))
        font = QtGui.QFont()
        font.setFamily("Agency FB")
        font.setPointSize(14)
        self.pw_label_2.setFont(font)
        self.pw_label_2.setObjectName("pw_label_2")
        self.login_pushButton = QtWidgets.QPushButton(login)
        self.login_pushButton.setGeometry(QtCore.QRect(100, 200, 75, 23))
        self.login_pushButton.setObjectName("login_pushButton")
        self.exit_pushButton = QtWidgets.QPushButton(login)
        self.exit_pushButton.setGeometry(QtCore.QRect(240, 200, 75, 23))
        self.exit_pushButton.setObjectName("exit_pushButton")
        self.lineEdit_id = QtWidgets.QLineEdit(login)
        self.lineEdit_id.setGeometry(QtCore.QRect(170, 70, 113, 20))
        self.lineEdit_id.setObjectName("lineEdit_id")
        self.lineEdit_pw = QtWidgets.QLineEdit(login)
        self.lineEdit_pw.setGeometry(QtCore.QRect(170, 130, 113, 20))
        self.lineEdit_pw.setObjectName("lineEdit_pw")
        self.lineEdit_pw.setEchoMode(QtWidgets.QLineEdit.Password)
        self.retranslateUi(login)
        self.exit_pushButton.clicked.connect(login.close)
        QtCore.QMetaObject.connectSlotsByName(login)

    def retranslateUi(self, login):
        _translate = QtCore.QCoreApplication.translate
        login.setWindowTitle(_translate("login", "Form"))
        self.id_label.setText(_translate("login", " account number "))
        self.pw_label_2.setText(_translate("login", " password "))
        self.login_pushButton.setText(_translate("login", " Sign in "))
        self.exit_pushButton.setText(_translate("login", " sign out "))

main_ui.py file

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

# Form implementation generated from reading ui file 'main.ui'
#
# Created by: PyQt5 UI code generator 5.15.2
#
# 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_main(object):
    def setupUi(self, main):
        main.setObjectName("main")
        main.resize(1007, 631)

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

    def retranslateUi(self, main):
        _translate = QtCore.QCoreApplication.translate
        main.setWindowTitle(_translate("main", "Form"))

main.py file

""" /******************************************************************************** * @Filename: main.py * @Author: haomingHu * @Version: 1.0 * @Date: 2021-03-26 * @Description: * @History: ********************************************************************************/ """



from login_ui import Ui_login
from main_ui  import Ui_main
import sys
from PyQt5 import QtWidgets
from PyQt5.QtGui import QPalette,QBrush,QPixmap
from PyQt5.QtCore import Qt

class myLogin(QtWidgets.QWidget,Ui_login):
    login_state = 0 
    def __init__(self):
        super(myLogin,self).__init__()
        self.setupUi(self)
        loginPalette = QPalette()
        loginPalette.setBrush(QPalette.Background, QBrush(QPixmap("./loginbackground.jpg")))
        #loginPalette.setColor(QPalette.Background, Qt.blue)
        self.setPalette(loginPalette)

class myMainGui(QtWidgets.QWidget,Ui_main):
    userID = ""
    # Constructors 
    def __init__(self):
        super(myMainGui,self).__init__()
        self.setupUi(self)

    def closeEvent(self,event):# The function name is fixed and immutable 
        reply=QtWidgets.QMessageBox.question(self,u'Notice!',u'Are you sure to exit?'
            ,QtWidgets.QMessageBox.Yes,QtWidgets.QMessageBox.No)
        #QtWidgets.QMessageBox.question(self,u' Pop up window name ',u' Pop-up content ', Options 1, Options 2)
        if reply==QtWidgets.QMessageBox.Yes:
            event.accept()# close window 
        else:
            event.ignore()# Ignore the click X event 



if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    myLogin = myLogin()
    myLogin.show()
    mainGUI = myMainGui()
    
    userIDSure = ""
    flag = 0
    def login_check():
        userID = myLogin.lineEdit_id.text()
        user_PW = myLogin.lineEdit_pw.text()
        print(userID)
        print(user_PW)
        '''  Here I use the login request interface of my server   When you use it, you can replace it with your own encapsulated login verification interface  '''
        
        '''  Normally , If you log in successfully , You need to send the successful login user information back to the main interface   That is to tell the main interface , Which user logged in , At this time, it can be defined in the class of the main interface   Some class properties , If login is successful , Will lineedit The input content of the object can be assigned to the class property  '''
        #login_flag = event.loginRequest(userID,user_PW)
        #if login_flag == 0:
        if userID == "1" and user_PW == "1":
            myLogin.login_state = 1
            mainGUI.userID = myLogin.lineEdit_id.text()
            myLogin.close()
            mainGUI.show()
            
    myLogin.login_pushButton.clicked.connect(login_check)

    sys.exit(app.exec_())

Supplementary information ：

• obtain lineedit How to input content ：

Use lineedit Of text Method to get , The object obtained is a string object .

        userID = myLogin.lineEdit_id.text()
        user_PW = myLogin.lineEdit_pw.text()

• Set the background （ I'll write a blog later ）

1. Window objects come with setStyleSheet Method

​    login.setObjectName("login")

​    login.setStyleSheet("#login{background-color:green}")

​ 2、 Use QPalette class

window = QMainWindow()
palette = QPalette()
palette.setColor(QPalette.Background, Qt.red)
window.setPalette(palette)

I wish you all a happy life , Happy learning ！