On Mon, 18 Apr 2016 14:18:06 +0100 Tom Hacohen <t...@osg.samsung.com> said:
> On 12/04/16 12:36, Carsten Haitzler wrote:
> > On Tue, 12 Apr 2016 12:27:02 +0100 Tom Hacohen <t...@osg.samsung.com> said:
> >
> >> On 12/04/16 10:57, Carsten Haitzler wrote:
> >>> just realized... Eo_Event *....
> >>>
> >>> it has obj. shouldn't it ALSO have src too? for event propagation we
> >>> really want to maintain src to be the original object the event happened
> >>> on AND obj to be the event the callback is being called on...
> >>>
> >>> ... comments?
> >>>
> >>>
> >>
> >> Let me start by saying that the magic of the Eo_Event structure is that
> >> we can add to it when we need to. Like now. :)
> >
> > yeah - i know. but let's add to it now... :)
> >
> >> At the moment we just overwrite obj (as you may know) and send a
> >> "native" event. The problem I have with src is that I feel like it's
> >> exposing internals of widgets for no apparent benefit. Having src feels
> >> useful to me as well, but I don't have a usecase in mind.
> >
> > you can't otherwise know where the event really originated. you only know
> > you got it. if it propagated... there would be cases you want to know - if
> > you are the original src of the event or just got a propagation - otherwise
> > it could be handled multiple times like
> >
> > if (event->src != event->obj) // propagated event
>
> I understand how it can be used, what I don't know is the purpose. A
> purpose like: "you can check if it's a propagated event" is not a real
> purpose, it's a method. Why would you want to know if it's a propagated
> event? What's the real use case where knowing that is useful?
>
> >
> >> In cases where it's really needed, src could be added to the event info.
> >
> > i think that's really too special/manual. i think it likely should be a core
> > feature. right now we have event forwarders ... and here src would need to
> > change. currently that's gore. i think we should also add propagation to
> > parent too like evas already does. that would necessitate this feature in
> > core. we currently dont have a propagate flag. in fact you likely want to
> > propagate some events and not others.
> >
> > anyway - i remember int he past doing code and going "shit. i dont know
> > where the event came from. i can't fix this simply. i have to do some weird
> > stuff instead". i remember making a mental note to fix this in future. :)
> > i'm now voicing that note. :)
>
> I'm not strictly against, just lacking an example... Got one you can
> describe?
another example:
struct _Evas_Event_Mouse_Down /** Mouse button press event */
{
int button; /**< Mouse button number that went down (1 - 32) *$
Evas_Point output; /**< The X/Y location of the cursor */
Evas_Coord_Point canvas; /**< The X/Y location of the cursor */
void *data;
Evas_Modifier *modifiers; /**< modifier keys pressed during the event */
Evas_Lock *locks;
Evas_Button_Flags flags; /**< button flags set during the event */
unsigned int timestamp;
Evas_Event_Flags event_flags;
Evas_Device *dev;
Evas_Object *event_src; /**< The Evas Object which actually triggered t$
};
... event_src. we already have it. and we are doing it adhoc event by event.
this is why it should be core.
--
------------- Codito, ergo sum - "I code, therefore I am" --------------
The Rasterman (Carsten Haitzler) ras...@rasterman.com
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