arrière empilés page Lecteur

Question

je ne peux pas aller à la première page du empilée widget sur, quand je clique sur le bouton d'annulation (du cancel_button_clicked (auto): fonction)

from PyQt5 import QtCore, QtWidgets 

from PyQt5.QtWidgets import QMessageBox 


class Ui_form(object): 

    def setupUi(self, form): 
     form.setObjectName("form") 
     form.resize(1000, 650) 
     self.groupBox = QtWidgets.QGroupBox(form) 
     self.groupBox.setGeometry(QtCore.QRect(530, 350, 451, 281)) 
     self.groupBox.setObjectName("groupBox") 
     self.stackedWidget = QtWidgets.QStackedWidget(self.groupBox) 
     self.stackedWidget.setGeometry(QtCore.QRect(9, 19, 431, 241)) 
     self.stackedWidget.setObjectName("stackedWidget") 
     self.page_1 = QtWidgets.QWidget() 
     self.page_1.setObjectName("page_1") 
     self.login_button = QtWidgets.QPushButton(self.page_1) 
     self.login_button.setGeometry(QtCore.QRect(20, 210, 75, 23)) 
     self.login_button.setObjectName("login_button") 
     self.register_button = QtWidgets.QPushButton(self.page_1) 
     self.register_button.setGeometry(QtCore.QRect(180, 210, 75, 23)) 
     self.register_button.setObjectName("register_button") 
     self.exit_button = QtWidgets.QPushButton(self.page_1) 
     self.exit_button.setGeometry(QtCore.QRect(330, 210, 75, 23)) 
     self.exit_button.setObjectName("exit_button") 
     self.username_line = QtWidgets.QLineEdit(self.page_1) 
     self.username_line.setGeometry(QtCore.QRect(230, 40, 113, 20)) 
     self.username_line.setObjectName("username_line") 
     self.password_line = QtWidgets.QLineEdit(self.page_1) 
     self.password_line.setGeometry(QtCore.QRect(230, 110, 113, 20)) 
     self.password_line.setObjectName("password_line") 
     self.username_label = QtWidgets.QLabel(self.page_1) 
     self.username_label.setGeometry(QtCore.QRect(60, 40, 81, 16)) 
     self.username_label.setObjectName("username_label") 
     self.password_label = QtWidgets.QLabel(self.page_1) 
     self.password_label.setGeometry(QtCore.QRect(60, 110, 61, 16)) 
     self.password_label.setObjectName("password_label") 
     self.stackedWidget.addWidget(self.page_1) 
     self.page_2 = QtWidgets.QWidget() 
     self.page_2.setObjectName("page_2") 
     self.registeruser_label = QtWidgets.QLabel(self.page_2) 
     self.registeruser_label.setGeometry(QtCore.QRect(60, 33, 71, 20)) 
     self.registeruser_label.setObjectName("registeruser_label") 
     self.registerepass_label = QtWidgets.QLabel(self.page_2) 
     self.registerepass_label.setGeometry(QtCore.QRect(60, 100, 61, 16)) 
     self.registerepass_label.setObjectName("registerepass_label") 
     self.registeruser_line = QtWidgets.QLineEdit(self.page_2) 
     self.registeruser_line.setGeometry(QtCore.QRect(240, 40, 113, 20)) 
     self.registeruser_line.setObjectName("registeruser_line") 
     self.registerpass_line = QtWidgets.QLineEdit(self.page_2) 
     self.registerpass_line.setGeometry(QtCore.QRect(240, 100, 113, 20)) 
     self.registerpass_line.setObjectName("registerpass_line") 
     self.signup_button = QtWidgets.QPushButton(self.page_2) 
     self.signup_button.setGeometry(QtCore.QRect(70, 190, 75, 23)) 
     self.signup_button.setObjectName("signup_button") 
     self.cancel_button = QtWidgets.QPushButton(self.page_2) 
     self.cancel_button.setGeometry(QtCore.QRect(270, 190, 75, 23)) 
     self.cancel_button.setObjectName("cancel_button") 
     self.stackedWidget.addWidget(self.page_2) 

     self.retranslateUi(form) 
     self.stackedWidget.setCurrentIndex(0) 

     self.login_button.clicked.connect(self.login_button_clicked) 
     self.register_button.clicked.connect(self.register_button_clicked) 

     self.cancel_button.clicked.connect(self.cancel_button_clicked) 
     self.exit_button.clicked.connect(self.exit_button_clicked) 


    def retranslateUi(self, form): 
     _translate = QtCore.QCoreApplication.translate 
     form.setWindowTitle(_translate("form", "Form")) 
     self.groupBox.setTitle(_translate("form", "USER")) 
     self.login_button.setText(_translate("form", "LOG IN")) 
     self.register_button.setText(_translate("form", "REGISTER")) 
     self.exit_button.setText(_translate("form", "EXIT")) 
     self.username_label.setText(_translate("form", "USERNAME")) 
     self.password_label.setText(_translate("form", "PASSWORD")) 
     self.registeruser_label.setText(_translate("form", "USERNAME")) 
     self.registerepass_label.setText(_translate("form", "PASSWORD")) 
     self.signup_button.setText(_translate("form", "SIGN UP")) 
     self.cancel_button.setText(_translate("form", "CANCEL")) 

    def login_button_clicked(self): 
     file = open('user.txt','r') 
     for line in file: 
      us, pa = line.rstrip().split(';') 
      if self.username_line.text() == us and self.password_line.text() == pa: 
       QMessageBox.information(QMessageBox(), "Login", "LOGIN SUCCESS!") 
       break 
     else: 
      QMessageBox.information(QMessageBox(), "login", "LOGIN FAILED!") 


    def register_button_clicked(self): 
     self.stackedWidget.setCurrentIndex(1) 

    def cancel_button_clicked(self): 
     self.stackedWidget.setCurrentIndex(-1) 

    def exit_button_clicked(self): 
     self.close() 

if __name__ == '__main__': 
    import sys 
    app = QtWidgets.QApplication(sys.argv) 
    LOGIN_window = QtWidgets.QDialog() 
    LOGIN = Ui_form() 
    LOGIN.setupUi(LOGIN_window) 

    LOGIN_window.show() 

    sys.exit(app.exec_()) 

Answer 1

Il est déconseillé de modifier la classe que Qt Designer génère, et pire si vous êtes un débutant. Le plus recommandé est de créer une classe qui implémente la logique et utilise la conception déjà créée. Pour cela, vous devez choisir le Widget approprié, si vous avez utilisé comme modèle MainWindow vous devez utiliser QMainWindow, si vous utilisez Widget, vous devez utiliser QWidget et si vous utilisez l'une des variantes de Dialog, vous devez utiliser QDialog comme Je pense que c'est le cas.

Depuis la tâche est simple, il est pas nécessaire de créer une méthode comme emplacement, on peut utiliser une fonction lambda: lambda: self.stackedWidget.setCurrentIndex(1)

Toutes ces I mis en œuvre dans le code suivant:

class Dialog(QtWidgets.QDialog, Ui_form): 
    def __init__(self, parent=None): 
     QtWidgets.QDialog.__init__(self, parent) 
     self.setupUi(self) 
     self.stackedWidget.setCurrentIndex(0) 

     self.login_button.clicked.connect(self.Confirm_Button_Clicked) 
     self.register_button.clicked.connect(lambda: self.stackedWidget.setCurrentIndex(1)) 
     self.cancel_button.clicked.connect(self.cancel_button_clicked) 

    def Confirm_Button_Clicked(self): 
     file = open('user.txt','r') 
     [...] 

    def cancel_button_clicked(self): 
     self.stackedWidget.setCurrentIndex(0) 


if __name__ == '__main__': 
    import sys 
    app = QtWidgets.QApplication(sys.argv) 
    w = Dialog() 
    w.show() 
    sys.exit(app.exec_()) 

Remarque: Si vous voulez revenir à la première page, vous devez placer la valeur de 0 comme l'indice actuel, rappelez-vous que les indices commencent à 0.