Re: [TCLCORE] TIP #438: Ensure Line Metrics are Up-to-Date

[Martin L. <mar...@gm...>]

Hi,

what's about syncing visible peer text widgets, too, with calling the sync 
widget command?

Best regards,

Martin Lemburg
Berlin /Deutschland

mar...@gm...
http://about.me/Martin0815

------- Original message -------
> From: Brian Griffin <bri...@ea...>
> To: jan...@gm...
> Cc: tcl...@li..., fvo...@fr...
> Sent: 19.11.'15,  17:13
>
> On Nov 19, 2015, at 7:04 AM, Jan Nijtmans <jan...@gm...> wrote:
>>
>> 2015-11-18 21:30 GMT+01:00 Francois Vogel:
>>> Thanks to Brian and Koen for providing their thoughts regarding the
>>> two proposals we currently have.
>>>
>>> The thing is: IIUC they do not agree :-)
>>>
>>> How do we resolve this so that, again, we can move on?
>>
>> Well can't we have both?
>
> I'm fine with this.
>
>>> I do not see clearly what our next move is. Let's not keep this stuff
>>> stuck, we all have it fresh in our minds now, we should make the final
>>> effort to decide what's the solution. I will then happily take care of
>>> implementation and docs and whatnot.
>>
>> I would like to add the 'callback' implementation to the TIP
>> branch, and then open the branch for experimenting. Questions
>> to be asked:
>> - How much is the burden for the events to be fired if they
>>  are not 'consumed'
>
> I doubt it's heavy since several widgets have several virtual events 
> that, presumably, are firing all the time with "nobody listening." 
> (http://www.tcl.tk/man/tcl8.6/TkCmd/event.htm#M41)
>
> I also think the count parameter for the event is unnecessary.  The event 
> should fire twice, once when the view is out of sync, and again when in 
> sync with the data.
>
>> - If we want to generalize it for other than text widgets,
>>  is the name 'yupdate' as command line still adequate?
>
> I've never really cared for 'yupdate', but didn't have an alternative to 
> suggest, but now I do.  I think 'sync' makes the most sense to me.  The 
> idea is that a widget can have a period of time where the internal data 
> model is not in sync with the view.  The 'sync' method would force the 
> view to be in sync with the data.  The matching event would be 
> <<WidgetViewSync>> with %d being true (1) or false (0).
>
> I would suggest that any widget operation that modifies the data model 
> would not trigger a sync event unless the view would not be in sync after 
> the command returns.
>
> -Brian
>
>
> 
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