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Re: Source Code: A min/max compound widget [message #12934]

Thu, 24 September 1998 00:00

Doug Larson
Messages: 10
Registered: September 1998

Junior Member

<HTML>
David Fanning wrote:
<BLOCKQUOTE TYPE=CITE>Rose (rmlongfield@my-dejanews.com)
writes:

>       
I am re-visiting the construction of compound widgets, having had not
 > so much success a few months ago
when first starting widgets.  I'll probably
 > be studying your program to hopefully
get some ideas, in particular, the use
 > of PRO_SET_VALUE and FUNC_GET_VALUE
which are not very well documented. (Nor
 > can I find their use anywhere on
DWF's web page :(  Dave seems to prefer
 > using a NotifyID keyword to pass
events and change things.

No, no, no. In fact, these days, ALL
of my compound widgets
 are written as objects. The purpose
of the FUNC_GET_VALUE
 for these objects is to return the
"self" object, which
 I can then control by means of methods.
This makes it
 incredibly easy to manipulate the
internal widgets of
 a compound widget.

I've been meaning to write an example
of this, but most
 of my real programs are too complex
for instructional
 programs, and I haven't had the time
to write a simple,
 but meaningful, example. I promise
to do it, but I really
 can't say when. :-)

Cheers,

David</BLOCKQUOTE>
 Hi,
    1) The students are back
so our network is *really* screwed(up)
       so
double posts may result so apologies in advance.
    2) After watching 
"South Park" last night I realized that I
       should
have made the widget do both float and integer, I
       guess
since SP is in Colorado and David lives in Colorado
       I made
the connection ... :)
    3) The extremely thin
IDL volume on Objects & Graphics led me
       to
believe that I would be spending far too much time learning
       Object
Oriented Programming without a net and not getting any
       work
done.  David's statement about "programs are too complex"
       seems
to justify my delay into OOP.
 Doug
<PRE>-- 
Douglas J. Larson     & ;nbsp;  e-mail: djl@loki.srl.caltech.edu
Space Radiation Lab     
California Institute of Technology
Mail Code: 220-47
Pasadena, CA 91125</PRE>
 </HTML>

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Re: Source Code: A min/max compound widget [message #12936 is a reply to message #12934]

Thu, 24 September 1998 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Rose (rmlongfield@my-dejanews.com) writes:

> I am re-visiting the construction of compound widgets, having had not
> so much success a few months ago when first starting widgets. I'll probably
> be studying your program to hopefully get some ideas, in particular, the use
> of PRO_SET_VALUE and FUNC_GET_VALUE which are not very well documented. (Nor
> can I find their use anywhere on DWF's web page :( Dave seems to prefer
> using a NotifyID keyword to pass events and change things.

No, no, no. In fact, these days, ALL of my compound widgets
are written as objects. The purpose of the FUNC_GET_VALUE
for these objects is to return the "self" object, which
I can then control by means of methods. This makes it
incredibly easy to manipulate the internal widgets of
a compound widget.

I've been meaning to write an example of this, but most
of my real programs are too complex for instructional
programs, and I haven't had the time to write a simple,
but meaningful, example. I promise to do it, but I really
can't say when. :-)

Cheers,

David

----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
E-Mail: davidf@dfanning.com
Phone: 970-221-0438, Toll-Free Book Orders: 1-888-461-0155
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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Re: Source Code: A min/max compound widget [message #12938 is a reply to message #12934]

Thu, 24 September 1998 00:00

rmlongfield
Messages: 68
Registered: August 1998

Member

In article <36098201.C8C40513@REMOVECAPSloki.srl.caltech.edu>,
Doug Larson <djl@REMOVECAPSloki.srl.caltech.edu> wrote:

> Hi All,
> I just finished a compound widget using sliders for getting the
> minimum
> and maximum of some range. I have included a simple test code at the
> bottom
> of the file for people to see what the widget does.

Hi Doug,
I downloaded your compound widget and it works fine on an SGI IDLv5.0.
I have already something that does a similar thing but in a very inelegant
(unelegant?) and inflexible way. I'll try using your program instead, as it is
written as a CW (and not a bunch of confusing statements which is what I have
now).

I am re-visiting the construction of compound widgets, having had not
so much success a few months ago when first starting widgets. I'll probably
be studying your program to hopefully get some ideas, in particular, the use
of PRO_SET_VALUE and FUNC_GET_VALUE which are not very well documented. (Nor
can I find their use anywhere on DWF's web page :( Dave seems to prefer
using a NotifyID keyword to pass events and change things.

Thanks
Rose

-----== Posted via Deja News, The Leader in Internet Discussion ==-----
http://www.dejanews.com/rg_mkgrp.xp Create Your Own Free Member Forum

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Re: Source Code: A min/max compound widget [message #13026 is a reply to message #12934]

Thu, 24 September 1998 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Doug Larson (djl@REMOVECAPSloki.srl.caltech.edu) writes:

> 2) After watching "South Park" last night I realized that I
> should have made the widget do both float and integer.

Don't worry about it. Most of my *really* good programming ideas
come about 10 seconds after I hit the SEND button. :-)

> 3) The extremely thin IDL volume on Objects & Graphics led me
> to believe that I would be spending far too much time learning
> Object Oriented Programming without a net and not getting any
> work done. David's statement about "programs are too complex"
> seems to justify my delay into OOP.

No, no, no. Just the opposite. Object-oriented programming
is so easy that programs get complex just by virtue of
you thinking, "Oh, wouldn't it be neat if..." I find it hard
to STOP writing object programs. There is just no end to the
neat things you can do with them.

Besides, this newsgroup is a good safety net. :-)

Cheers,

David

----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
E-Mail: davidf@dfanning.com
Phone: 970-221-0438, Toll-Free Book Orders: 1-888-461-0155
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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