How to add navigation to application

[Kyler]

Hello, first off I am new to PyQt5, so I apologize if I make a mistake in my explanation.

Background
I am building a desktop application, and I am trying to figure out how to navigate to a new page once an event is triggered such as a click on a QPushButton. Right now, I have a login page, and I would like to display the user's dashboard if they use the correct credentials.

Problem
The issue I am having is understanding how to do the actual updating to the screen. If possible, I would like to have two classes one for the login screen, and another for the dashboard and then just replace the login part with the dashboard when it's needed. I have tried to do something like this, but I end up with 2 individual windows rather than just updating the current window. I might be able to write some messy logic that would utilize the .close() and .show() methods, but I would imagine there is a cleaner way to do so.

A Brief Version of My Code

# This class is for displaying the simple login screen 
class Login(QtWidgets.QMainWindow):
    def __init__(self):
        super(Login, self).__init__()
        login_path = ".//UI Files//login.ui"
        uic.loadUi(os.path.join(login_path, "login.ui"), self) 

        self.loginbutton = self.findChild(QtWidgets.QPushButton,"loginbutton")
        self.usernamefield = self.findChild(QtWidgets.QLineEdit, "usernamefield")
        self.passwordfield = self.findChild(QtWidgets.QLineEdit, "passwordfield")

        def sometypeoffunction(self):
         # This function would just verify the credentials 

# This class would be for displaying the dashboard
class MainUI(QtWidgets.QMainWindow):
    def __init__(self):
        super(MainUI, self).__init__()
        ui_path = os.path.dirname(os.path.abspath(__file__))
        uic.loadUi(os.path.join(ui_path, "mainui.ui"), self) 

        # Sidebar assignments 
        self.logo = self.findChild(QtWidgets.QLabel,"logo")
        self.newpatientbuttion = self.findChild(QtWidgets.QLabel,"newpatientbutton")   

        
        self.graphlist = QtWidgets.QListWidget(self)
        temp = ["One", "Two", "Three"]
        self.graphlist.addItems(temp)
        self.graphlist.setGeometry(8,190,191,241)
        self.graphlist.setStyleSheet("background-color: rgb(209, 102, 24); border:none; color:white")
        self.graphlist.setFont(QtGui.QFont("Ariel", 14))
        self.graphlist.setCursor(QtGui.QCursor(QtCore.Qt.PointingHandCursor))
        #Topbar assignemts
        self.searchbar = self.findChild(QtWidgets.QLineEdit, "lineEdit")
        self.logoutbutton = self.findChild(QtWidgets.QLabel,"logoutbutton")
        self.confirmbutton = self.findChild(QtWidgets.QPushButton, "confirmbutton")

def main():
    app = QtWidgets.QApplication(sys.argv)
    
    login = Login()
    login.show()
    
    # I would need some way to not show window until the login is verified 
    window = MainUI()
    window.show()
    app.exec_()


if __name__ == "__main__":
    main()

My WireFrame for Context

I want to start off from a login page as so

Then once the user logs in, the application should update as so,

From within this dashboard, it would as update as so

My Take
I believe that my problem here is that both classes inherit from QMainWindow however, I am not exactly how to handle this situation. Should just the Login class inherit from this class? If so, then what should MainUI inherit from? I could be completely wrong, but I wanted to attempted this before asking for help. If someone could explain to me what I am doing wrong I would greatly appreciate it. I haven't been able to find many similar examples so, I am running out of solutions I can think of. Thank you.

[jsulm]

@Kyler The log-in window does not have to be a main window. Simply use a widget without parent - it will be shown as window. Or better use QDialog for that.