[Tkinter-discuss] Adding/removing widgets from a running application?

[Jim Kleckner]

Martin Franklin wrote:
> Russell E. Owen wrote:
>> In article <foqjpn$eff$1 at ger.gmane.org>,
>>  Alexander Belchenko <bialix at ukr.net> wrote:
>>
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>>> Jim Kleckner пишет:
>>> | Any pointers to what it takes to add/remove widgets
>>> | from a running application?
>>>
>>> Something like this maybe?
>>>
>>> from Tkinter import *
>>> root = Tk()
>>> x = Label(root, text='Hello')
>>> x.pack()
>>> Button(root, text='Hide', command=x.pack_forget).pack()
>>> root.mainloop()
>> Or if you use the gridder you can remove things temporary and restore 
>> them again easily:
>>   x.grid(row=0....)
>>   x.grid_remove() # to temporarily remove
>>   x.grid() # to restore using the original grid settings
>>   x.grid_forget() # to remove permanently
>> (remove is not supported by the packer)
>>
> 
> pack_forget does not erm remove either ;)
> 
> 
> 
> from Tkinter import *
> 
> 
> root = Tk()
> root.title("Pack is BEST!!!")
> 
> l = Label(root, text="Pack is simply the best")
> l.pack()
> 
> 
> def forget():
>      l.pack_forget()
> 
> def remember():
>      l.pack()
> 
> 
> b = Button(root, text="Forget about it", command=forget)
> b.pack()
> b = Button(root, text="Wait, I still need you", command=remember)
> b.pack()
> 
> 
> root.mainloop()
> 
> 
> BUT... the remember function packs the label widget in it's new packing 
> order, so it is packed after the two buttons, as far as I know the only
> way to 'remember' its pack position is to put it inside a Frame widget
> (and leave the Frame where it stands) - at least thats how I do it
> 
> To the OP I guess you've seen how easy this is with Tk(inter) :)
> 
> Cheers,
> Martin.

Thank you for the nice examples.

I see running this application that the remember button
causes the label to relocated to the bottom of the window.

What I actually want is to construct and add new widgets
during the mainloop().  So a button that appends new labels
at the bottom based on a text entry field would demonstrate
the issue.

I've been playing with this extremely simple and interesting
tVector helper code from here:
  http://www.freenet.org.nz/python/tVector/

Ideally, I just want to reach in and extend the widget list.
I'm attaching a file with some concept code using tVector
(yes, I should rewrite it with grid, I guess).

The grid manager looks interesting and it seems that it
ought to be able do something like this but the methods
don't obviously have an append() or some such.

Jim