[Tutor] A little Tkinter question

[Gregor Lingl]

Marilyn Davis schrieb:
> Hi Tutors,
> 
> I'm reviewing GUIs and wondering:
> 
> When you pack a component, and you specify fill = BOTH, how is this
> different from expand = YES?
> 
Hi Marilyn,
This is a bit tricky and hard to explain, so I recommend playing around 
with this little program from John Grayson's Tkinter book:

from Tkinter import *

class App:
     def __init__(self, master):
         master.geometry("300x200")
         fm = Frame(master)
         Button(fm, text='Left').pack(side=LEFT, fill=BOTH, expand=1)
         Button(fm, text='Center').pack(side=LEFT, fill=BOTH, expand=1)
         Button(fm, text='Right').pack(side=LEFT, fill=BOTH, expand=1)
         fm.pack(fill=BOTH, expand=YES)


root = Tk()
root.option_add('*font', ('verdana', 12, 'bold'))
root.title("Pack - Example 9")
display = App(root)
root.mainloop()

Modify the three lines with Button(....).pack(...)
for instance by setting expand = 0 (which is the default value)

         Button(fm, text='Left').pack(side=LEFT, fill=BOTH, expand=0)
         Button(fm, text='Center').pack(side=LEFT, fill=BOTH, expand=0)
         Button(fm, text='Right').pack(side=LEFT, fill=BOTH, expand=0)

or by tropping the fill option:

         Button(fm, text='Left').pack(side=LEFT, expand=1)
         Button(fm, text='Center').pack(side=LEFT, expand=1)
         Button(fm, text='Right').pack(side=LEFT, expand=1)

and so on.

These Examples are from Chapter 5, several others concerning the packer 
can be found at:

https://secure.manning.com/catalog/view.php?book=grayson&item=source

Hope this helps
Gregor


> Thank you for any insight.
> 
> Marilyn Davis
> 
> 
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor
> 
> 

-- 
Gregor Lingl
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Autor von "Python für Kids"
Website: python4kids.net