It works if you change it like so:
from tkinter import *
class ShowList(Frame):
def __init__(self, root):
Frame.__init__(self, root)
self.grid()
self.draw_widgets()
def draw_widgets(self):
cframe = Frame(self)
cframe.grid(row=1, sticky=N+S+E+W)
canv = Canvas(cframe)
canv.grid(row=0, column=0, sticky=N+S+E+W)
vscroll = Scrollbar(cframe, orient=VERTICAL, command=canv.yview)
hscroll = Scrollbar(cframe, orient=HORIZONTAL,
command=canv.xview)
vscroll.grid(row=0, column=1, sticky=N+S)
hscroll.grid(row=1, column=0, sticky=E+W)
canv["xscrollcommand"] = hscroll.set
canv["yscrollcommand"] = vscroll.set
aframe = Frame(canv)
id = canv.create_window(0,0,window=aframe, anchor=N+W)
for i in range(0,100):
Label(aframe, text=str(i), anchor=N+W).grid(row=i,
column=0)
aframe.update_idletasks()
canv["scrollregion"]=canv.bbox(ALL)
root = Tk()
m=ShowList(root)
root.mainloop()
You have to call update_idletasks to force the canvas to be mapped to screen;
until it is mapped, its bounding box is (0,0,1,1). You can call
update_idletasks through any widget.
That said, I wonder if it wouldn't be better to put canvas objects directly on
the canvas, instead of putting widgets in a frame on the canvas. The way
you're doing it, you can't give the widgets tags, which are what give the
canvas its real power.
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