如何在顶层（） Tkinter 中使用 canvas 制作按钮

Question

我正在尝试在 Tkinter 的toplevel()中使用canvas.create_window制作一个按钮。 按钮用于 go 回到主 window。 显示第一个“开始”按钮，但不显示第二个“返回”按钮。 代码如下。

from tkinter import *

win = Tk()

def play_button():
    win.withdraw()
    top = Toplevel()
    top.geometry("300x300")
    button_back = Button(top, text="Back", command=back_button)

    canvas_two = Canvas(top, width = 300, height = 300)    
    canvas_two.pack(fill="both", expand=True)         
    Button_reverse = canvas_two.create_window(0, 0, anchor="nw", window=button_back)
    top.resizable(False, False)

def back_button():
    win.deiconify()

win.geometry("300x300")

canvas = Canvas(win, width = 300, height = 300)
canvas.pack(fill="both", expand=True)      
button_play = Button(win, text="Play", command=play_button)
Play_button = canvas.create_window(0, 0, anchor="nw", window=button_play )

win.mainloop()

Answer 1

问题是canvas_two和button_back的创建顺序。 您需要先创建Canvas ，然后将Button放在上面，如下所示。

def play_button():
    win.withdraw()
    top = Toplevel()
    top.geometry("300x300")

    canvas_two = Canvas(top, width=300, height=300)
    canvas_two.pack(fill="both", expand=True)

    button_back = Button(top, text="Back", command=back_button)
    Button_reverse = canvas_two.create_window(0, 0, anchor="nw", window=button_back)
    top.resizable(False, False)