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From: Mark Summerfield <m.n.summerfield@gmail.com>
Newsgroups: comp.lang.tcl
Subject: Re: How to set ttk::radiobutton -variable to an object's instance
 variable?
Date: Fri, 11 Jul 2025 15:21:52 -0000 (UTC)
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On Fri, 11 Jul 2025 13:28:06 +0200, Schelte wrote:

> On 11/07/2025 11:55, Mark Summerfield wrote:
>> Given this class:
>> 
>> oo::class create App {
>>      # ...
>>      variable ShowState
>> }
>> 
>> And this method:
>> 
>> oo::define App method make_controls {} {
>>      # ...
>>      ttk::radiobutton .controlsFrame.showFrame.asIsRadio \
>>          -text "Show as-is" -value asis -variable ShowState
>>      set ShowState asis
>> 
>> The variable given to the radio button and the instance variable
>> are_different_.
> 
>      ttk::radiobutton .controlsFrame.showFrame.asIsRadio \
>        -text "Show as-is" -value asis -variable [my varname ShowState]
> 
> 
> Schelte.

That silently didn't work.
I also tried `-variable [my variable ShowState]` and that didn't work
either.

I don't use snit so I couldn't use that approach either.

Given that Tcl 9 has the incredibly useful `callback` command
which I use all the time with Tk widgets for their `-command`
options, I'm surprised there isn't an equivalent for Tk widget
variables: or perhaps there is and I haven't found it?