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 need to do the update_idletasks to force the canvas to be mapped before you
figure out the bounding box. Until the canvas is mapped to the screen, the
bounding box is (0,0,1,1) so there no scrolling possible. (You can call
update_ideltasks through any widget.)
That said, I wonder why you're putting widgets in the frame instead of putting
objects directly on the canvas. The way you're doing it you can't use tags,
which are what really give the canvas its power.
Saul
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