Tkinter 画布滚动条变灰

Question

我尝试遵循一些教程来了解如何让画布滚动，但它最终总是呈灰色。我尝试在画布上添加一个滚动区域，但我不理解它，只知道它没有变灰，但仍然什么也没做。

我的代码（运行后将其调整为垂直较短，但它仍然呈灰色）：

self.main_window = Tk()
        self.root = Frame(self.main_window, bg="white")
        self.root.pack(fill=BOTH, expand=1)

        # TOP SECTION
        self.top = Frame(self.root, bg="white")
        self.top.pack(fill=BOTH, expand=1)
        Label(self.top, text="#########################################").pack()

        # BOTTOM SECTION
        self.bottom = Frame(self.root, bg="white")
        self.bottom.pack(fill=BOTH, expand=1)

        # BOTTOM-LEFT SECTION
        self.canvas = Canvas(self.bottom, bg="white")
        self.canvas.pack(fill=BOTH, expand=1, side=LEFT)
        self.left = Frame(self.canvas)
        self.left.pack(fill=BOTH, expand=1)
        left_scroll = Scrollbar(self.left, orient=VERTICAL)
        left_scroll.pack(side=RIGHT, fill=Y)
        left_scroll.config(command=self.canvas.yview)
        self.canvas.configure(yscrollcommand=left_scroll.set)
        for root, dirs, files in os.walk("C:\\", topdown=True):
            full = dirs + files
            for i in full:
                Button(self.left, text=i, bg="white", anchor="w", relief=SOLID, borderwidth=0).pack(fill=BOTH)
            break

        # BOTTOM-RIGHT SECTION
        self.right = Frame(self.bottom, bg="white")
        self.right.pack(fill=BOTH, expand=1, side=RIGHT)
        Label(self.right, text="##########################").pack()
        Label(self.right, text="##########################").pack()

        self.main_window.mainloop()

Answer 1

您不应该使用pack()将框架self.left放入 中self.canvas，self.canvas.create_window(0, 0, window=self.left, anchor='nw')而是使用。

另外，您不应该将滚动条放入框架中self.left，而应将其放入框架中self.bottom并将其放在一边LEFT。

最后，您需要更新scrollregion才能self.canvas使滚动条正常工作。

以下是根据您的修改后的代码：

    self.main_window = Tk()
    self.root = Frame(self.main_window, bg="white")
    self.root.pack(fill=BOTH, expand=1)

    # TOP SECTION
    self.top = Frame(self.root, bg="white")
    self.top.pack(fill=BOTH, expand=1)
    Label(self.top, text="#########################################").pack()

    # BOTTOM SECTION
    self.bottom = Frame(self.root, bg="white")
    self.bottom.pack(fill=BOTH, expand=1)

    # BOTTOM-LEFT SECTION
    self.canvas = Canvas(self.bottom, bg="white")
    self.canvas.pack(fill=BOTH, expand=1, side=LEFT)
    self.left = Frame(self.canvas)
    #self.left.pack(fill=BOTH, expand=1)
    self.canvas.create_window(0, 0, window=self.left, anchor='nw') ###
    left_scroll = Scrollbar(self.bottom, orient=VERTICAL) ### self.left to self.bottom
    left_scroll.pack(side=LEFT, fill=Y) ### side=RIGHT to side=LEFT
    left_scroll.config(command=self.canvas.yview)
    self.canvas.configure(yscrollcommand=left_scroll.set)
    for root, dirs, files in os.walk("C:\\", topdown=True):
        full = dirs + files
        for i in full:
            Button(self.left, text=i, bg="white", anchor="w", relief=SOLID, borderwidth=0).pack(fill=BOTH)
        break
    ### update scrollregion of self.canvas
    self.left.update()
    self.canvas.configure(scrollregion=self.canvas.bbox('all'))

    # BOTTOM-RIGHT SECTION
    self.right = Frame(self.bottom, bg="white")
    self.right.pack(fill=BOTH, expand=1, side=RIGHT)
    Label(self.right, text="##########################").pack()
    Label(self.right, text="##########################").pack()

    self.main_window.mainloop()