Tkinter：如何让画布窗口中的框架扩展到画布的大小？

Question

所以我一直在使用tkinter中的画布小部件来创建一个充满标签的框架，它有一个滚动条。除了框架只扩展到其中放置的标签的大小之外，一切都很好——我希望框架扩展到父画布的大小。

如果我对画布中的框架使用pack（expand=True）（我在下面的代码中已经注释掉了它），那么很容易做到这一点，但是滚动条不起作用。

以下是适当的代码位：

    ...
    self.canvas = Canvas(frame, bg = 'pink')
    self.canvas.pack(side = RIGHT, fill = BOTH, expand = True)

    self.mailbox_frame = Frame(self.canvas, bg = 'purple')

    self.canvas.create_window((0,0),window=self.mailbox_frame, anchor = NW)

    #self.mailbox_frame.pack(side = LEFT, fill = BOTH, expand = True)

    mail_scroll = Scrollbar(self.canvas, orient = "vertical",
        command = self.canvas.yview)
    mail_scroll.pack(side = RIGHT, fill = Y)

    self.canvas.config(yscrollcommand = mail_scroll.set)

    self.mailbox_frame.bind("<Configure>", self.OnFrameConfigure)


def OnFrameConfigure(self, event):
    self.canvas.configure(scrollregion=self.canvas.bbox("all"))

我还提供了一个带有彩色边框的图像，这样你可以看到我的意思。粉红色区域是需要邮箱_框架填充的画布（您可以看到右侧的滚动条）：

Answer 1

在画布上设置绑定

Answer 2

仅供将来参考，以防其他人需要知道：

        frame = Frame(self.bottom_frame)
        frame.pack(side = LEFT, fill = BOTH, expand = True, padx = 10, pady = 10)

        self.canvas = Canvas(frame, bg = 'pink')
        self.canvas.pack(side = RIGHT, fill = BOTH, expand = True)

        self.mailbox_frame = Frame(self.canvas, bg = 'purple')

        self.canvas_frame = self.canvas.create_window((0,0),
            window=self.mailbox_frame, anchor = NW)
        #self.mailbox_frame.pack(side = LEFT, fill = BOTH, expand = True)

        mail_scroll = Scrollbar(self.canvas, orient = "vertical", 
            command = self.canvas.yview)
        mail_scroll.pack(side = RIGHT, fill = Y)

        self.canvas.config(yscrollcommand = mail_scroll.set)

        self.mailbox_frame.bind("<Configure>", self.OnFrameConfigure)
        self.canvas.bind('<Configure>', self.FrameWidth)

    def FrameWidth(self, event):
        canvas_width = event.width
        self.canvas.itemconfig(self.canvas_frame, width = canvas_width)

    def OnFrameConfigure(self, event):
        self.canvas.configure(scrollregion=self.canvas.bbox("all"))