Multi tool use

Clash Royale CLAN TAG

I'm trying multiple labels, use Scrollbar. but, I made a mistake

from tkinter import *
from tkinter import ttk


class TestScroll(object):
def __init__(self, master):
self.master = master

# list
self.list = Listbox(self.master, height=10)
self.list.grid(row=0, column=0, sticky=NSEW)
for x in range(50):
self.list.insert(END, str(x) + " row...")

# scroll
self.scroll = Scrollbar(self.master, command=self.list.yview)
self.scroll.grid(row=0, column=1, sticky=NSEW)
self.list.configure(yscrollcommand=self.scroll.set)


class TestScroll2(object):
def __init__(self, master):
self.master = master

# canvas
self.canvas = Canvas(self.master, height=200)
self.canvas.grid(row=0, column=0)

# frame
self.frame = Frame(self.canvas)
for x in range(50):
ttk.Label(self.frame, text='label' + str(x) + '...').grid(column=0, row=x)
self.canvas.create_window((0, 0), window=self.frame, anchor=NW)

# scroll
self.scroll = Scrollbar(self.master, command=self.canvas.yview)
self.scroll.grid(row=0, column=1, sticky=NSEW)
self.canvas.configure(yscrollcommand=self.scroll.set)

# button
Button(self.master, text="activate scroll", command=self.activate_scroll).grid(row=0, column=2)
print(self.canvas.bbox(ALL)) # why can't ?

def activate_scroll(self):
print(self.canvas.bbox(ALL)) # need write here ?
self.canvas.configure(scrollregion=self.canvas.bbox(ALL))


root = Tk()
TestScroll2(root)
root.mainloop()


Why couldn't the first print get the correct value?

self.master.update_idletasks()

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