Tkinter汉堡点餐系统：Order Again按钮返回菜单页面的实现问题

问题描述 #

我开发基于Tkinter的汉堡点餐系统时遇到问题：点击Order Again按钮后，无法回到菜单页面，目前仅能关闭弹窗，无法返回可选择订单的主页面。尝试多种方法仍未解决，希望获得帮助修复代码。

原代码：

import tkinter as tk
from tkinter import ttk
from tkinter import messagebox

class MainWindow(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.title('Hamburger Ordering')
        self.frames = {}
        self.frames['MenuPage'] = MenuPage(self)

        self.change_window('MenuPage')
    
    def change_window(self, page_name):
        for frame in self.frames.values():
            frame.grid_remove()
        frame = self.frames[page_name]
        frame.grid(row=0, column=0)

class MenuPage(tk.Frame):
    def __init__(self, parent):
        tk.Frame.__init__(self, parent)

        self.parent = parent

        # Select Patty Label
        self.label1 = tk.Label(self, text='Select Patty: ')
        self.label1.grid(row=0, column=0)

        # Set Value = ' ' in order for the radio buttons appear empty when the program runs
        self.patty = tk.StringVar(value=' ')

        # Radio Boxes
        self.radiobutton1 = tk.Radiobutton(self, text='Pork', variable=self.patty, value='Pork')
        self.radiobutton1.grid(row=1, column=0)

        self.radiobutton2 = tk.Radiobutton(self, text='Beef', variable=self.patty, value='Beef')
        self.radiobutton2.grid(row=1, column=1)

        self.radiobutton3 = tk.Radiobutton(self, text='Chicken', variable=self.patty, value='Chicken')
        self.radiobutton3.grid(row=1, column=2)

        self.radiobutton4 = tk.Radiobutton(self, text='Vegan', variable=self.patty, value='Vegan')
        self.radiobutton4.grid(row=1, column=3)

        self.radiobutton5 = tk.Radiobutton(self, text='No Patty', variable=self.patty, value='No Patty')
        self.radiobutton5.grid(row=1, column=4)

        # Select Condiments Label
        self.label2 = tk.Label(self, text='Condiment: ')
        self.label2.grid(row=3, column=0)

        # Check Boxes for Condiments
        self.var1 = tk.IntVar()
        self.var2 = tk.IntVar()
        self.var3 = tk.IntVar()
        self.var4 = tk.IntVar()

        self.checkbox1 = tk.Checkbutton(self, text='Ketchup', variable=self.var1)
        self.checkbox1.grid(row=4, column=0, padx=4, pady=5, sticky="w")

        self.checkbox2 = tk.Checkbutton(self, text='Mayo', variable=self.var2)
        self.checkbox2.grid(row=5, column=0, padx=4, pady=5, sticky="w")

        self.checkbox3 = tk.Checkbutton(self, text='Mustard', variable=self.var3)
        self.checkbox3.grid(row=6, column=0, padx=5, pady=5, sticky="w")

        self.checkbox4 = tk.Checkbutton(self, text='Hot Sauce', variable=self.var4)
        self.checkbox4.grid(row=7, column=0, padx=6, pady=5, sticky="w")

        # Select Add - ons Label
        self.label3 = tk.Label(self, text='Add - ons: ')
        self.label3.grid(row=3, column=1)

        # Check Boxes for Add - ons
        self.var5 = tk.IntVar()
        self.var6 = tk.IntVar()
        self.var7 = tk.IntVar()
        self.var8 = tk.IntVar()
        self.var9 = tk.IntVar()

        self.checkbox5 = tk.Checkbutton(self, text='Lettuce', variable=self.var5)
        self.checkbox5.grid(row=4, column=1, padx=6, pady=5, sticky="w")

        self.checkbox6 = tk.Checkbutton(self, text='Cheese', variable=self.var6)
        self.checkbox6.grid(row=5, column=1, padx=6, pady=5, sticky="w")

        self.checkbox7 = tk.Checkbutton(self, text='Pickles', variable=self.var7)
        self.checkbox7.grid(row=6, column=1, padx=6, pady=5, sticky="w")

        self.checkbox8 = tk.Checkbutton(self, text='Tomato', variable=self.var8)
        self.checkbox8.grid(row=7, column=1, padx=6, pady=5, sticky="w")

        self.checkbox9 = tk.Checkbutton(self, text='Cucumber', variable=self.var9)
        self.checkbox9.grid(row=8, column=1, padx=6, pady=5, sticky="w")

        # Quantity Picker
        self.label4 = tk.Label(self, text='Quantity: ')
        self.label4.grid(row=3, column=2)

        self.spinbox1 = tk.Spinbox(self, from_=1, to=10)
        self.spinbox1.grid(row=3, column=3)

        # Drinks Picker
        self.label5 = tk.Label(self, text='Drink: ')
        self.label5.grid(row=5, column=2)

        drink_list = ['Coke', 'Sprite', 'Pineapple', 'Iced Tea', 'Alfonso Light', 'Water','No Drinks']
        self.combobox = ttk.Combobox(self, values=drink_list)
        self.combobox.grid(row=5, column=3)

        # Confirm Order Button
        self.button1 = tk.Button(text = 'Confirm Order', command = self.confirm_order)
        self.button1.grid(row = 4, column = 3, padx=10, pady=10, sticky="e" )
        
    # Retrieves all the selected items and displays it in a messagebox    
    def confirm_order(self):
        patty = self.patty.get()
        condiments = [var.get() for var in [self.var1, self.var2, self.var3, self.var4]]
        add_ons = [var.get() for var in [self.var5, self.var6, self.var7, self.var8, self.var9]]
        quantity = self.spinbox1.get()
        drink = self.combobox.get()

        message = f'Patty: {patty}\n'
        message += 'Condiments: ' + ', '.join([condiment for i, condiment in enumerate(['Ketchup', 'Mayo', 'Mustard', 'Hot Sauce']) if condiments[i]]) + '\n'
        message += 'Add-ons: ' + ', '.join([add_on for i, add_on in enumerate(['Lettuce', 'Cheese', 'Pickles', 'Tomato', 'Cucumber']) if add_ons[i]]) + '\n'
        message += f'Quantity: {quantity}\n'
        message += f'Drink: {drink}'

        confirm_order = messagebox.askokcancel(title='Confirm Order', message=message)

        if confirm_order == True:
            self.parent.withdraw()
            self.ConfirmPage(self.parent, patty, condiments, add_ons, quantity, drink)

    def ConfirmPage(self, patty, condiments, add_ons, quantity, drink):
        new_window = tk.Toplevel(root)
        new_window.geometry("600x300")
        new_window.title('Order Confirmation')

        message = f'Thank you for ordering!\n\n'
        message += f'Patty: {patty}\n'
        message += 'Condiments: ' + ', '.join([condiment for i, condiment in enumerate(['Ketchup', 'Mayo', 'Mustard', 'Hot Sauce']) if condiments[i]]) + '\n'
        message += 'Add-ons: ' + ', '.join([add_on for i, add_on in enumerate(['Lettuce', 'Cheese', 'Pickles', 'Tomato', 'Cucumber']) if add_ons[i]]) + '\n'
        message += f'Quantity: {quantity}\n'
        message += f'Drink: {drink}'

        label = tk.Label(new_window, text=message)
        label.pack()

        button = tk.Button(new_window, text='Order Again', command=self.lift_menu)
        button.pack()

    def lift_menu(self):
        self.parent.lift()


if __name__ == '__main__':
    root = MainWindow()
    root.mainloop()

修复后的代码 #

import tkinter as tk
from tkinter import ttk
from tkinter import messagebox

class MainWindow(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.title('Hamburger Ordering')
        self.frames = {}
        self.frames['MenuPage'] = MenuPage(self)

        self.change_window('MenuPage')
    
    def change_window(self, page_name):
        for frame in self.frames.values():
            frame.grid_remove()
        frame = self.frames[page_name]
        frame.grid(row=0, column=0)

class MenuPage(tk.Frame):
    def __init__(self, parent):
        tk.Frame.__init__(self, parent)

        self.parent = parent

        # Select Patty Label
        self.label1 = tk.Label(self, text='Select Patty: ')
        self.label1.grid(row=0, column=0)

        # Set Value = ' ' in order for the radio buttons appear empty when the program runs
        self.patty = tk.StringVar(value=' ')

        # Radio Boxes
        self.radiobutton1 = tk.Radiobutton(self, text='Pork', variable=self.patty, value='Pork')
        self.radiobutton1.grid(row=1, column=0)

        self.radiobutton2 = tk.Radiobutton(self, text='Beef', variable=self.patty, value='Beef')
        self.radiobutton2.grid(row=1, column=1)

        self.radiobutton3 = tk.Radiobutton(self, text='Chicken', variable=self.patty, value='Chicken')
        self.radiobutton3.grid(row=1, column=2)

        self.radiobutton4 = tk.Radiobutton(self, text='Vegan', variable=self.patty, value='Vegan')
        self.radiobutton4.grid(row=1, column=3)

        self.radiobutton5 = tk.Radiobutton(self, text='No Patty', variable=self.patty, value='No Patty')
        self.radiobutton5.grid(row=1, column=4)

        # Select Condiments Label
        self.label2 = tk.Label(self, text='Condiment: ')
        self.label2.grid(row=3, column=0)

        # Check Boxes for Condiments
        self.var1 = tk.IntVar()
        self.var2 = tk.IntVar()
        self.var3 = tk.IntVar()
        self.var4 = tk.IntVar()

        self.checkbox1 = tk.Checkbutton(self, text='Ketchup', variable=self.var1)
        self.checkbox1.grid(row=4, column=0, padx=4, pady=5, sticky="w")

        self.checkbox2 = tk.Checkbutton(self, text='Mayo', variable=self.var2)
        self.checkbox2.grid(row=5, column=0, padx=4, pady=5, sticky="w")

        self.checkbox3 = tk.Checkbutton(self, text='Mustard', variable=self.var3)
        self.checkbox3.grid(row=6, column=0, padx=5, pady=5, sticky="w")

        self.checkbox4 = tk.Checkbutton(self, text='Hot Sauce', variable=self.var4)
        self.checkbox4.grid(row=7, column=0, padx=6, pady=5, sticky="w")

        # Select Add - ons Label
        self.label3 = tk.Label(self, text='Add - ons: ')
        self.label3.grid(row=3, column=1)

        # Check Boxes for Add - ons
        self.var5 = tk.IntVar()
        self.var6 = tk.IntVar()
        self.var7 = tk.IntVar()
        self.var8 = tk.IntVar()
        self.var9 = tk.IntVar()

        self.checkbox5 = tk.Checkbutton(self, text='Lettuce', variable=self.var5)
        self.checkbox5.grid(row=4, column=1, padx=6, pady=5, sticky="w")

        self.checkbox6 = tk.Checkbutton(self, text='Cheese', variable=self.var6)
        self.checkbox6.grid(row=5, column=1, padx=6, pady=5, sticky="w")

        self.checkbox7 = tk.Checkbutton(self, text='Pickles', variable=self.var7)
        self.checkbox7.grid(row=6, column=1, padx=6, pady=5, sticky="w")

        self.checkbox8 = tk.Checkbutton(self, text='Tomato', variable=self.var8)
        self.checkbox8.grid(row=7, column=1, padx=6, pady=5, sticky="w")

        self.checkbox9 = tk.Checkbutton(self, text='Cucumber', variable=self.var9)
        self.checkbox9.grid(row=8, column=1, padx=6, pady=5, sticky="w")

        # Quantity Picker
        self.label4 = tk.Label(self, text='Quantity: ')
        self.label4.grid(row=3, column=2)

        self.spinbox1 = tk.Spinbox(self, from_=1, to=10)
        self.spinbox1.grid(row=3, column=3)

        # Drinks Picker
        self.label5 = tk.Label(self, text='Drink: ')
        self.label5.grid(row=5, column=2)

        drink_list = ['Coke', 'Sprite', 'Pineapple', 'Iced Tea', 'Alfonso Light', 'Water','No Drinks']
        self.combobox = ttk.Combobox(self, values=drink_list)
        self.combobox.grid(row=5, column=3)

        # Confirm Order Button - 指定父组件为当前Frame
        self.button1 = tk.Button(self, text='Confirm Order', command=self.confirm_order)
        self.button1.grid(row=4, column=3, padx=10, pady=10, sticky="e" )
        
    # Retrieves all the selected items and displays it in a messagebox    
    def confirm_order(self):
        patty = self.patty.get()
        condiments = [var.get() for var in [self.var1, self.var2, self.var3, self.var4]]
        add_ons = [var.get() for var in [self.var5, self.var6, self.var7, self.var8, self.var9]]
        quantity = self.spinbox1.get()
        drink = self.combobox.get()

        message = f'Patty: {patty}\n'
        message += 'Condiments: ' + ', '.join([condiment for i, condiment in enumerate(['Ketchup', 'Mayo', 'Mustard', 'Hot Sauce']) if condiments[i]]) + '\n'
        message += 'Add-ons: ' + ', '.join([add_on for i, add_on in enumerate(['Lettuce', 'Cheese', 'Pickles', 'Tomato', 'Cucumber']) if add_ons[i]]) + '\n'
        message += f'Quantity: {quantity}\n'
        message += f'Drink: {drink}'

        confirm_order = messagebox.askokcancel(title='Confirm Order', message=message)

        if confirm_order == True:
            self.parent.withdraw()
            self.ConfirmPage(self.parent, patty, condiments, add_ons, quantity, drink)

    def ConfirmPage(self, parent, patty, condiments, add_ons, quantity, drink):
        # 使用传入的parent创建弹窗，避免依赖全局变量
        new_window = tk.Toplevel(parent)
        new_window.geometry("600x300")
        new_window.title('Order Confirmation')

        message = f'Thank you for ordering!\n\n'
        message += f'Patty: {patty}\n'
        message += 'Condiments: ' + ', '.join([condiment for i, condiment in enumerate(['Ketchup', 'Mayo', 'Mustard', 'Hot Sauce']) if condiments[i]]) + '\n'
        message += 'Add-ons: ' + ', '.join([add_on for i, add_on in enumerate(['Lettuce', 'Cheese', 'Pickles', 'Tomato', 'Cucumber']) if add_ons[i]]) + '\n'
        message += f'Quantity: {quantity}\n'
        message += f'Drink: {drink}'

        label = tk.Label(new_window, text=message)
        label.pack()

        #