如何通过新窗口更改tkinter画布的大小？

def change_canvas_size():
    # 创建新窗口
    new_window = tk.Toplevel(root)
    new_window.title("Change Canvas Size")

    # 创建标签和输入框，用于获取新的宽度和高度
    width_label = tk.Label(new_window, text="Width:")
    width_label.pack()
    width_entry = tk.Entry(new_window)
    width_entry.pack()

    height_label = tk.Label(new_window, text="Height:")
    height_label.pack()
    height_entry = tk.Entry(new_window)
    height_entry.pack()

    # 创建确认按钮，点击后更改画布大小
    confirm_button = tk.Button(new_window, text="Confirm", command=lambda: resize_canvas(int(width_entry.get()), int(height_entry.get())))
    confirm_button.pack()

def resize_canvas(new_width, new_height):
    canvas.config(width=new_width, height=new_height)

change_size_button = tk.Button(root, text="Change Size", command=change_canvas_size)
change_size_button.pack()