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Re: Tip for using Compound Widgets [message #31705 is a reply to message #31686]

Sun, 04 August 2002 12:43

MKatz843
Messages: 98
Registered: March 2002

Member

David Fanning <david@dfanning.com> wrote in message
>> I'd be interested to know if anyone else uses tricks like this, or has
>> a better way,
>
> Oh my goodness, Mr. Katz. You are so very, very close
> to writing object widgets.

Since I'm over 30, I'm still getting used to object programming. I'm
using it all the time for creating complicated graphics and even for
the file-output tasks, but it's still "new" to me.

The idea of the compound widget is that we create something new that
behaves like one of the basic elemental widgets. I can see making the
leap to objects in several ways, and I'm interested to hear how you'd
recommend doing it. (Have you written any tips for it on your site?)

When using a compound widget, one accesses the child widgets through
the parent. That includes events and SET/GET_VALUE. That's the issue I
was trying to solve: making SET_VALUE more intelligently access the
functions of the compund widget.

So, in an object widget, (here's where I'm guessing) one doesn't need
the compound widget formalism. You create an object that knows all
about the children and dispense completely with

widget_control, SET_VALUE=... in favor of
widget_obj -> Do_Something, arg

But what exactly happens to events?
Does it take a lot longer to program the object widget than the
equivalanet compound widget?
Is there a template that's been published that other people follow, so
object newbies don't have to re-invent the wheel? Does RSI have
anything to say about the subject, as they do for compound widgets?

Thanks for your advice!

M. Katz

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[Message index]

		Re: Tip for using Compound Widgets By: David Fanning on Mon, 05 August 2002 19:04
		Re: Tip for using Compound Widgets By: Pavel A. Romashkin on Mon, 05 August 2002 13:36
		Re: Tip for using Compound Widgets By: MKatz843 on Sun, 04 August 2002 12:43
		Re: Tip for using Compound Widgets By: David Fanning on Sat, 03 August 2002 12:25
		Re: Tip for using Compound Widgets By: Rob.Preece on Thu, 29 August 2002 10:13

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