Re: [TCLCORE] TIP #349: New "-cargo" option for every Tk widget

[Zbigniew B. <zb...@is...>]

On Fri, Apr 17, 2009 at 12:39:18PM -0500, Damon Courtney wrote:

>> It strikes me that an option is rather limited -- give it about 2  
>> months
>> and we will see reusable bits of code on the wiki that do cool things
>> (like tooltips) using -cargo, and suddenly its not really available  
>> for "the script author" because (s)he is trying to juggle the 5 cool
>> extensions that all want to use it.

If I may add my "3 cents/pennies" (not sure, will it reach tcl-core list
since I'm not a subscriber - please forward, if possible):

I'm pretty sure, that all of you have much more experience than I have,
but I would again point your attention, that such possibility has been
durings years "extensively tested" in Clipper, and there wasn't any
"fight for access to field". And so I think, we can trust in programmers'
sanity, and it's pretty reasonable to name such fears as exaggerated.

In case of doubt all you need to do is to make a quick check "still free?"
before use.

> it's quite easy in Tcl.  I would just use a simple command trace on the 
> deletion of the widget.  Binding to <Destroy>, as some in the original 
> thread had suggested, has the side-effect of being easy to wipe out by 
> the developer if they choose to bind <Destroy> themselves.

There are people - like myself - who prefer the option, because this will
make the field contents "strictly bound" to a widget. Of course, there will
be still available other ways to achieve similar result (available even
now) - and in my opinion that methods are less convenient, and more
complicated. And because of this I decided to make this suggestion; I'm
pretty sure, many will be pleased with such new possibility.
-- 
				pozdrawiam / regards

						Zbigniew Baniewski