Question

我已经四处搜索，似乎无法找到问题的答案。我正在尝试为以下代码创建一个工作滚动条，似乎无法让它工作。问题似乎与OnFrameConfigure方法有关。我在其他地方看到该方法应该是def OnFrameConfigure(event):但是当我将(event)部分放入我的方法时，除非我在class

之外编写函数，否则它不起作用

 class Main(tk.Tk):

    def __init__(self, *args, **kwargs):
        '''This initialisation runs the whole program'''

        #tk.Tk.__init__(self, *args, **kwargs)
        main =  tk.Tk()
        canvas = tk.Canvas(main)
        scroll = tk.Scrollbar(main, orient='vertical', command=canvas.yview)
        canvas.configure(yscrollcommand=scroll.set)
        frame = tk.Frame(canvas)
        scroll.pack(side='right', fill='y')
        canvas.pack(side='left', fill='both', expand='yes')
        canvas.create_window((0,0), window=frame)
        frame.bind('<Configure>', self.OnFrameConfigure(parent=canvas))

        for i in range(100):
            tk.Label(frame, text='I am a Label').pack()

        main.mainloop()


    def OnFrameConfigure(self, parent):
        '''Used to allowed scrolled region in a canvas'''
        parent.configure(scrollregion=parent.bbox('all'))

Answer 1

Your problem starts here:

frame.bind('<Configure>', self.OnFrameConfigure(parent=canvas))

You are immediately calling the OnFrameConfigure function. That is not how you use bind. You must give a reference to a callable function. Since you're using a class, you don't need to pass parent in, unless you have this one function work for multiple widgets.

Change the binding to this:

frame.bind('<Configure>', self.OnFrameConfigure)

Change the method definition to this:

def OnFrameConfigure(self, event):

Finally, your __init__ needs to save a reference to the canvas, which you can then use in that function:

def __init__(self, *args, **kwargs):
    ...
    self.canvas = tk.Canvas(...)
    ...

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

在类中为canvas创建一个tkinter滚动条

1 个答案: