[Tutor] : finding out if the horizontal scrollbar on a Tix.CheckList is being used or not
Michael Lange
klappnase at freenet.de
Sat Jul 22 14:46:18 CEST 2006
On Fri, 21 Jul 2006 15:01:30 -0400
Orri Ganel <singingxduck at gmail.com> wrote:
> As a follow up to my last email, I think the issue is more that the
> display doesn't update before the command associated with the "search"
> button has finished processing, so any attempts to get data about the
> display from within the method are fruitless since the display hasn't
> changed yet. I am well and truly stumped. I have no idea how to get
> around this.
Calling update_idletasks() from within this method before quering diplay data
should do the trick.
The only way I can think of to do this without using the
> display is figuring out the longest track name length and setting the
> CheckList width to the pixel version of that. Unfortunately, I don't
> know the conversion for character units to pixels, either, so I'm still
> stuck.
>
I think the tkFont module has what you need:
>>> from Tkinter import *
>>> l=Label(text='hi')
>>> l.pack()
>>> import tkFont
>>> f=tkFont.Font(family='helvetica', size='-14')
>>> l.config(font=f)
>>> print f.measure(l['text'])
11
>>> print f.measure('blahblah')
54
I hope this helps
Michael
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