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From: Rich <rich@example.invalid>
Newsgroups: comp.lang.tcl
Subject: Re: event generate send arg
Date: Thu, 2 Jan 2025 04:13:10 -0000 (UTC)
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Shaun Kulesa <user1405@newsgrouper.org.uk.invalid> wrote:
> I'm trying to block any user interaction that is not done via `event generate`.

First question is: why?  What are you really trying to accomplish?

Next suggestion, have you looked into using 'tk busy' (man n busy).  It 
might work better than having to remap every single default event 
binding within Tk.

> To do this I want to break the bindings when $user is not 1.

> I want to pass the $user arg to the procedure `block` but I do not 
> know how to.

Note the documentation for -data in the event manpage:

  -data string
    String may be any value; it specifies the user_data field for 
    the event.  Only valid for virtual events.  Corresponds to the
    %d substitution for virtual events in binding scripts.

It tells you how to retreive the '-data' field value, you use the %d 
substitution.

But -data is also  "only valid for virtual events" which is why you 
can't use it with <ButtonPress> (because <ButtonPress> is not a virtual 
event).

> I thought this is done by -data but I get an error saying I can not 
> use that with the event <ButtonPress>.

> 
> ```
> package require Tk
> 
> button .b -text "Hello, World!"
> pack .b -padx 20 -pady 20
> 
> proc block {{user 0}} {
>     if {$user ne 1} {
>         return -code break
>     }
>     return
> }
> 
> bind .b <ButtonPress> {block}
> bind .b <ButtonRelease> {block}
> 
> after 1000 [list event generate .b <ButtonPress> -data 1]
> ```