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Re: OOP Programming, Was: Something Else [message #11226 is a reply to message #11057]

Fri, 06 March 1998 00:00

steinhh
Messages: 260
Registered: June 1994

Senior Member

Just one thing about this kind of solution (from Mark Rivers):

> pro mca_display_event, event ; event processing for MCA application
>
> widget_control, event.top, get_uvalue = mca_display
> mca_display->event, event
> end

I realize(d) (after I started to write this message :-) that this is
the event processing for the entire application.... But for compound
widgets, etc, it is customary (and a good custom, too!) to leave
the compound widget ID's UVALUE to the "owner's" discretion. Thus,
in general, it is wise to store the object pointer on the uvalue
of the *first child* of the event.id.

I.e., in a compound widget event *function* (allowing the event to be
modified and sent further up the hierarchy, or being gobbled up by
sending along a zero value) one should do something like (untested
code follows!):

function cw_object_event,event
widget_control,widget_info(event.id,/child),get_uvalue=objec t
return, object->event_func(event)
end

The observant reader will of course have noticed that if this
scheme is followed *consistently*, you only need *one* event
function (outside the individual class scopes, that is!) for
*all* of your "objectified" compound widget types!!

Neat, if I may say so myself.

Darn, why can't I have some time to spend actually *doing* this
OO stuff, instead of just writing about it!

Regards,

Stein Vidar

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		OOP Programming, Was: Something Else By: davidf on Wed, 04 March 1998 00:00
		Re: OOP Programming, Was: Something Else By: davidf on Fri, 06 March 1998 00:00
		Re: OOP Programming, Was: Something Else By: steinhh on Fri, 06 March 1998 00:00

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