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From: Eric Brunel <eric.brunel@pragmadev.com>
Newsgroups: comp.lang.tcl
Subject: Re: Treeview item indicators in image-based themes vs Tk 9
Date: Tue, 4 Feb 2025 09:38:49 -0000 (UTC)
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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