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devel / comp.lang.tcl / `pack/grid -in` depends on frame creation order ?

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* `pack/grid -in` depends on frame creation order ?xol odho
`* `pack/grid -in` depends on frame creation order ?Harald Oehlmann
 `- `pack/grid -in` depends on frame creation order ?xol odho

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`pack/grid -in` depends on frame creation order ?

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Subject: `pack/grid -in` depends on frame creation order ?
From: xolo...@gmail.com (xol odho)
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 by: xol odho - Mon, 7 Nov 2022 05:51 UTC

Hello everyone. The quest for learning Tk goes on... so much to learn. So,
today I have the following question.

I'm trying to understand what causes the difference in behavior between
the following two scripts, A and B:

A:

frame .f
button .b -text hallo
pack .f
pack .b -in .f

B:

button .b -text hallo
frame .f
pack .f
pack .b -in .f

A and B are the almost the same but just with .f and .b created in
different order. I was expecting these two variations to behave the same,
but they don't: when .f is created before .b, the button .b appears, the
second version doesn't show the button.

The same happens if "grid" is used instead of "pack".

Why is this?

Re: `pack/grid -in` depends on frame creation order ?

<tka8cv$3hcem$1@dont-email.me>

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From: wortka...@yahoo.com (Harald Oehlmann)
Newsgroups: comp.lang.tcl
Subject: Re: `pack/grid -in` depends on frame creation order ?
Date: Mon, 7 Nov 2022 07:25:39 +0100
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 by: Harald Oehlmann - Mon, 7 Nov 2022 06:25 UTC

Am 07.11.2022 um 06:51 schrieb xol odho:
> Hello everyone. The quest for learning Tk goes on... so much to learn. So,
> today I have the following question.
>
> I'm trying to understand what causes the difference in behavior between
> the following two scripts, A and B:
>
> A:
>
> frame .f
> button .b -text hallo
> pack .f
> pack .b -in .f
>
> B:
>
> button .b -text hallo
> frame .f
> pack .f
> pack .b -in .f
>
>
> A and B are the almost the same but just with .f and .b created in
> different order. I was expecting these two variations to behave the same,
> but they don't: when .f is created before .b, the button .b appears, the
> second version doesn't show the button.
>
> The same happens if "grid" is used instead of "pack".
>
> Why is this?

You have two points to consider:
- tabbing order
- clipping order

Clipping order is set by creation time.
It may be modified by the raise command.
So, "raise .b" will probably show the button.
As a rule of thumb, first create the parents, then the childs.

The 2nd point of this complex is tabbing order.

Try
pack [entry .1] -side top
pack [entry .2] -side top
pack [entry .3] -side top

and

pack [entry .1] -side top
pack [entry .3] -side bottom
pack [entry .2] -side top

and use the tab-key to cycle between the widgets.

Harald

Re: `pack/grid -in` depends on frame creation order ?

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Subject: Re: `pack/grid -in` depends on frame creation order ?
From: xolo...@gmail.com (xol odho)
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 by: xol odho - Mon, 7 Nov 2022 20:00 UTC

Hi, thanks for the answer!
It's very clear now.

Seems I had read about this in Ousterhout's book and totally forgot about it.
I usually create the frames before the widgets, that's why I forgot about the potential need to use `raise`. I'll keep it in mind :)

Actually it is explained on page 406 of the 2nd edition of that book, (section 21.7 Hierarchical Geometry Management).

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