通过 if 登录并显示菜单项

Question

我正在尝试使用 tkinter 条目创建登录。将输入的内容与密码进行比较，如果正确，您应该可以访问菜单栏中的更多内容。

如果我理解正确，我需要更新 window 才能更新菜单，但我不知道如何更新。并且变量 "moberg" 似乎没有更新为 True。可能是一个是全局的（？），另一个属于 class。但我也不知道如何让它工作。

这是我目前所做的示例。

from tkinter import *
moberg="no"
class PCMsyntax(Frame):
    def update():
        print("updated") #only for visual, remove later
        app.mainloop.after(1, update)

    def __init__(self, master):
        super().__init__(master)
        self.pack(fill=BOTH, expand=True)
        self.initUI()


    def initUI(self):
        menubar = Menu(self.master)
        self.master.config(menu=menubar)
        syntaxMenu = Menu(menubar, tearoff=False)
        submenu = Menu(syntaxMenu)
        syntaxMenu.add_cascade(label='Arithmetic Exp', underline=0, command='')
        syntaxMenu.add_cascade(label='Assign & Compare', underline=0, command='')
        syntaxMenu.add_separator()
        syntaxMenu.add_cascade(label='Math', menu=submenu, underline=0)
        submenu.add_command(label="abs()", command='')
        if moberg == True:
            syntaxMenu.add_cascade(label='No public access', menu=submenu, underline=0)
            submenu.add_command(label="onlyForLabTech()")



        menubar.add_cascade(label="Syntax", underline=0, menu=syntaxMenu)
        menubar.add_cascade(label="Login", underline=0, command=self.onLogin)


    def onLogin(self):
        self.newWindow = Toplevel(self.master)
        self.app = Password(self.newWindow)



class Password():
    def __init__(self, master):
        self.master = master
        self.frame = Frame(self.master)
        self.pwd = Entry(self.master, width=30, bg="whitesmoke", foreground="whitesmoke")
        self.pwd.pack()
        self.verifyButton = Button(self.frame, text = 'Verify', width = 25, command = self.verify_password)
        self.verifyButton.pack()
        self.frame.pack()

    def verify_password(self):
        user_entry = self.pwd.get() 
        if str(user_entry) == "test":
            moberg=True
            print(moberg) #only for visual, remove later
            PCMsyntax.update
            self.master.destroy()
        else:
            moberg=False
            print(moberg) #only for visual, remove later
            self.master.destroy()

def main():
    root = Tk()
    root.geometry("560x600")
    app = PCMsyntax(master=root)
    app.mainloop()

if __name__ == '__main__':
    main()

Answer 1

您可以通过以下方式实现您正在寻找的东西：

from tkinter import *

class App:
    def __init__(self, root):
        self.root = root
        self.public = Frame(self.root, borderwidth=1, relief="solid") #public, visible frame
        self.hidden = Frame(self.root, borderwidth=1, relief="solid") #hidden, private frame
        self.label1 = Label(self.public, text="This text and everything over here is public.") #this is inside the public frame and so is visible
        self.entry1 = Entry(self.public) #so is this
        self.label2 = Label(self.hidden, text="This text and everything over here is hidden and only appears after login.") #this one is in the hidden frame and so is private before login
        self.button1 = Button(self.public, text="Login", command=self.command) #this is in the public frame
        self.public.pack(side="left", expand=True, fill="both") #we pack the public frame on the left of the window
        self.label1.pack() #then we pack all the widgets for both frames here and below
        self.entry1.pack()
        self.label2.pack()
        self.button1.pack()
    def command(self): #whenever the login button is pressed this is called
        if self.button1.cget("text") == "Login" and self.entry1.get() == "password": #we check if the button is in login state or not and if the password is correct
            self.hidden.pack(side="right", expand=True, fill="both") #if it is we pack the hidden frame which makes it and it's contents visible
            self.button1.configure({"text": "Logout"}) #we then set the button to a logout state
        elif self.button1.cget("text") == "Logout": #if the button is in logout state
            self.hidden.pack_forget() #we pack_forget the frame, which removes it and it's contents from view
            self.button1.configure({"text": "Login"}) #and then we set the button to login state

root = Tk()
App(root)
root.mainloop()

这是不言自明的，如果不是，我已经解释了发生了什么。

这只是实现您正在寻找的目标的众多方法之一。

我还想指出，登录系统很复杂，如果您想将其用于任何严肃的事情或作为一个软件包进行销售，那么我这样做的方式并不安全。

我建议查看人们在 tkinter 中处理敏感信息的其他方式。

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