Tkinter pack bug in Python 2.3

[Frank Stajano]

The compact form of pack behaves differently (and I believe incorrectly)
compared to the long form. The following two scripts demonstrate it, at
least on this interpreter:
Python 2.3.2 (#1, Oct 9 2003, 12:03:29)
[GCC 3.3.1 (cygming special)] on cygwin


# First script, no bug

# I want a canvas inside a frame inside a toplevel, with the canvas
# filling the toplevel even as I resize the window. This does it.

from Tkinter import *

root = Tk()
frame = Frame(root, bg="lightBlue" )
frame.pack(side =TOP, expand=1, fill=BOTH)
canvas = Canvas(frame, bg="lightGreen" )
canvas.pack(sid e=TOP, expand=1, fill=BOTH)

mainloop()





# Second script, bug

# I want a canvas inside a frame inside a toplevel, with the canvas
# filling the toplevel even as I resize the window. This doesn't do
# it, and instead makes the canvas a sibling of the frame, instead of
# a child. (Try resizing the toplevel and you'll see.) Why?

from Tkinter import *

root = Tk()
frame = Frame(root, bg="lightBlue") .pack(side=TOP, expand=1, fill=BOTH)
canvas = Canvas(frame, bg="lightGreen" ).pack(side=TOP , expand=1, fill=BOTH)

mainloop()



Frank (filologo disneyano) http://www-lce.eng.cam.ac.uk/~fms27/

[Peter Otten]

Re: Tkinter pack bug in Python 2.3

Frank Stajano wrote:
[color=blue]
>
> The compact form of pack behaves differently (and I believe incorrectly)
> compared to the long form. The following two scripts demonstrate it, at[/color]

There is no "compact form", see below.

[...]
[color=blue]
> # Second script, bug
>
> # I want a canvas inside a frame inside a toplevel, with the canvas
> # filling the toplevel even as I resize the window. This doesn't do
> # it, and instead makes the canvas a sibling of the frame, instead of
> # a child. (Try resizing the toplevel and you'll see.) Why?
>
> from Tkinter import *
>
> root = Tk()
> frame = Frame(root, bg="lightBlue") .pack(side=TOP, expand=1, fill=BOTH)[/color]

You are assigning the result of the pack() method, i. e. None, to frame
here, and consequently Canvas is constructed with None instead of a Frame
instance as the first argument.
[color=blue]
> canvas = Canvas(frame, bg="lightGreen" ).pack(side=TOP , expand=1,
> fill=BOTH)
>
> mainloop()[/color]

Peter

[Michael Peuser]

Re: Tkinter pack bug in Python 2.3


"Frank Stajano" <fms27@cam.ac.u k

Old Perl programmer, hmm... ;-)

Kindly
MichaelP