tkinter Canvas加滑动条为什么变灰没用

因为还要设置Canvas的滑动范围：

通过canvas的对象方法scrollregion设置

如，设置为全部，则为canvas1.configure(scrollregion=c.bbox("all"))

示例代码（ChatGPT写的）：

from tkinter import *


def on_canvas_configure(event):
    canvas.configure(scrollregion=canvas.bbox("all"))


root = Tk()

# 创建滚动条
scrollbar_y = Scrollbar(root, orient="vertical")

# 创建Canvas，并绑定滚动条
canvas = Canvas(root, yscrollcommand=scrollbar_y.set)
scrollbar_y.config(command=canvas.yview)

# 将滚动条与Canvas进行布局
scrollbar_y.pack(side="right", fill="y")
# scrollbar_x.pack(side="bottom", fill="x")
canvas.pack(side="left", fill="both", expand=True)

# 添加内容到Canvas
frame = Frame(canvas)
canvas.create_window((0, 0), window=frame, anchor="nw")

# 配置Canvas滚动区域
canvas.bind("<Configure>", on_canvas_configure)

# 往Canvas中添加一些示例内容
for i in range(100):
    label = Label(frame, text="Label {}".format(i))
    label.pack()

root.mainloop()