Dear Pythonistas,
I've been trying to write a script that results in a set of widgets in a
scrollable widget. Since tkinter is "the" gui for Python (and about the
only one that I can be sure will not require additional software
installation), I went that route, and wrote the following:
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()
cframe.grid(row=1, sticky=N+S+E+W)
canv = Canvas(cframe)
canv["scrollregion"]=canv.bbox(ALL)
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)
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)
root = Tk()
m=ShowList(root)
root.mainloop()
...which is great in that it does display the list of items (in this case, a
bunch of Labels) but not so great in the fact that the vertical scrollbar's
scroll thumb is the list of the entire scroll trough, making skip down/up a
screenful impossible. Both the horizontal scrollbar and the vertical
scrollbar will scroll until the list is off the screen (not the desired
behavior).
Initially, I thought the canv["scrollregion"] = canv.bbox(ALL) would take
care of the off-screen scrolling by making the scrollable region no larger
than it needs to be. Reading many examples of Python+tkinter code, intended
to demonstrate the way to code scrollbars and canvases, didn't enlighten me
enough to figure out the bug(s) in my code. Any suggestions as to what I
did wrong?
Many thanks in advance,
--agb
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