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From: Harald Oehlmann <wortkarg3@yahoo.com>
Newsgroups: comp.lang.tcl
Subject: Re: Treeview item indicators in image-based themes vs Tk 9
Date: Tue, 4 Feb 2025 10:48:23 +0100
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Am 04.02.2025 um 10:38 schrieb Eric Brunel:
> On Mon, 3 Feb 2025 20:50:23 +0100, Francois Vogel wrote:
> 
>> Le 03/02/2025 à 11:22, Eric Brunel a écrit :
>>> In tcl/tk 8.6, the styling for these indicators are usually done via
>>> something like this:
>>>
>>> ttk::style element create Treeitem.indicator \
>>>                 image [list $image_for_closed \
>>>                     user1 $image_for_open \
>>>                     user2 $image_for_no_children \
>>>                 ] ...
>>>
>>> But this doesn't seem to work in tk 9: now all items have an indicator
>>> showing the image_for_closed whether they have children or not, and
>>> whether the item is opened or not.
>>>
>>> I suspect a change in the names for the states "user1" and "user2" -
>>> which were admittedly not very user-friendly - but I just can't find
>>> any reference for these, and by what I should replace them in tk 9 if
>>> that's indeed the problem.
>>
>> I think [527cb3cd5d] could shed light on this:
>>
>>       https://core.tcl-lang.org/tk/info/527cb3cd5d
>>
>> Regards,
>> Francois
> 
> Thanks for that. I've seen the argument about not using internally states
> that are supposed to be user-defined, and I can understand that,
> especially considering this never seemed to be correctly documented.
> 
> Now no more being able to do in themes what was possible in tk 8.6 is a
> bit of a shame. Which brings the question: why have internal states at
> all? The states 'open', 'leaf', 'first' and 'last' are indeed very
> specific to some elements, but as long as they can be used in themes, it
> might be nice to actually have them named and usable...
> 
> Thanks again!
>   Eric

Eric,
I think, this should be solved.
Please discuss in the ticket.

We have a public Tk telco today 16:00 UTC on the TCL Jitsi.
Maybe, we may speak about this.


Take care,
Harald