| Re: Simple GUI question [message #34791] |
Sat, 19 April 2003 01:10 |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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Dear David and Pavel
I like very much the I of idl it stands for interactive.
For my opinion objects can't be interactive they are always well planned.
The people starting with idl are almost very different in learning and
working with idl. In most cases my feeling is if they can theireselfs work
a bit on a solution without reading many books or asking a lot of people
for help they like idl more.
I started myself with the basics idl book. It was a small book about 50
pages. On each page was an example and just behind you have the result.
This book is missing since 5.0 from the idl descriptions.
The people who stay longer using idl they are interested more in writing
good quality sources. They are intereseted in reading whatever is
available.
My conclusion
I feel well if someone asks first time in this group and he or she gots a
simple and a more detailed answer.
If this person spent later more time on discussions we will see what
happens.
regards
Reimar
David Fanning wrote:
> Pavel Romashkin (pavel_romashkin@hotmail.com) writes:
>
>> That Chameleon... or Catalyst... library of yours must be taking up all
>> of your time :-(
>
> Oh, don't even start with me! While my erstwhile collaborator
> takes a four-day Easter holiday (I'm only working with Americans
> and Ukrainians from now on; boy, *they* know how to work!), I'm stuck
> deep in the bowels of some object that refuses to cooperate with me.
> It doesn't even help my mood if I think of what I am doing at the
> moment as "gathering material for a book".
>
> I spent four hours yesterday tracking down a leaking
> memory problem that turned out to be my own stupidity.
> Something I was suppose to learn in Objects 101. I'm
> not even going to tell you want is was because you would
> laugh, but I'm pretty sure I'm not going to forget *that*
> again soon. :-(
>
> I wouldn't even be here today, except that I fell into
> that damn Microsoft trap of trying to be too clever.
> Now I've got the damn engine open and parts thrown around
> from here to there, and it may take a week to put it all
> back together again.
>
> And in the meantime, I took a look outside. The apple
> trees are in full bloom today, the grass is green from
> the recent, badly needed rain, the sun is shining and
> I'm sitting here fuming. How in the world did my
> priorities ever get so screwed up!? Sigh...
>
> Cheers,
>
> David
--
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg-i/
============================================================ ======
a IDL library at ForschungsZentrum Juelich
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_lib_intro. html
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| Re: Simple GUI question [message #34792 is a reply to message #34791] |
Fri, 18 April 2003 14:00  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Pavel Romashkin (pavel_romashkin@hotmail.com) writes:
> That Chameleon... or Catalyst... library of yours must be taking up all
> of your time :-(
Oh, don't even start with me! While my erstwhile collaborator
takes a four-day Easter holiday (I'm only working with Americans
and Ukrainians from now on; boy, *they* know how to work!), I'm stuck
deep in the bowels of some object that refuses to cooperate with me.
It doesn't even help my mood if I think of what I am doing at the
moment as "gathering material for a book".
I spent four hours yesterday tracking down a leaking
memory problem that turned out to be my own stupidity.
Something I was suppose to learn in Objects 101. I'm
not even going to tell you want is was because you would
laugh, but I'm pretty sure I'm not going to forget *that*
again soon. :-(
I wouldn't even be here today, except that I fell into
that damn Microsoft trap of trying to be too clever.
Now I've got the damn engine open and parts thrown around
from here to there, and it may take a week to put it all
back together again.
And in the meantime, I took a look outside. The apple
trees are in full bloom today, the grass is green from
the recent, badly needed rain, the sun is shining and
I'm sitting here fuming. How in the world did my
priorities ever get so screwed up!? Sigh...
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Simple GUI question [message #34793 is a reply to message #34792] |
Fri, 18 April 2003 12:54 |
Pavel Romashkin
Messages: 166
Registered: April 1999
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Senior Member |
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David Fanning wrote:
>
> But I'm just trying to raise the general level of
> IDL competence, Pavel, not pick a fight with you.
> As I'm well aware, you have the vast majority of
> IDL programmers on your side in this one. :-)
Pick a fight! Good Lord, David, not me! Especially that I am indeed on
the same side as you are on this one, just more tolerant to shortcuts :-)
Now that I wrote this I am in doubts; you have been awfully quiet lately.
That Chameleon... or Catalyst... library of yours must be taking up all
of your time :-(
Cheers,
Pavel
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| Re: Simple GUI question [message #34796 is a reply to message #34793] |
Fri, 18 April 2003 11:31 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Pavel Romashkin (pavel_romashkin@hotmail.com) writes:
> Oh come on. Nobody needs to *start* IDL programming in the widget_object
> world. This is the easiest way to scare off new users with "difficulty"
> of using IDL. Not every program must be reuseable, some are ok just
> doing what they are designed to do.
My grandmother used to tell me, "If you start well, you end
well." Cobbling programs together works, I don't deny that.
I'm just saying they don't work for very long and they get
new programmers into bad habits.
God knows, there are plenty of bad programs out there.
(Some on my web page, as I was just discovering.) But
it doesn't take *that* much longer to learn to do it
right, and it pays off in spades down the road.
But I'm just trying to raise the general level of
IDL competence, Pavel, not pick a fight with you.
As I'm well aware, you have the vast majority of
IDL programmers on your side in this one. :-)
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Simple GUI question [message #34797 is a reply to message #34796] |
Fri, 18 April 2003 10:20 |
Pavel Romashkin
Messages: 166
Registered: April 1999
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Senior Member |
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Oh come on. Nobody needs to *start* IDL programming in the widget_object
world. This is the easiest way to scare off new users with "difficulty"
of using IDL. Not every program must be reuseable, some are ok just
doing what they are designed to do.
David Fanning wrote:
>
> Now I see where all those "impossible to use again" programs
> come from. :-)
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| Re: Simple GUI question [message #34798 is a reply to message #34797] |
Fri, 18 April 2003 09:54 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Pavel Romashkin (pavel_romashkin@hotmail.com) writes:
> This will be simplier than David's suggestion. Modal widget would be an
> overkill here.
> Change the calling order completely. Call the GUI procedure first. Event
> handler can be very simple with just one "Do it" button that needs to
> pass events. You can ignore events from text widgets.
> Upon "Do it" event (after user entered data into all text widgets)
> collect the contents from all your text widgets using widget_control,
> txtWidget_ix, get_value=Data_ix and then call your data processing
> function from the event handler, passing it all the Data_ix variables.
Now I see where all those "impossible to use again" programs
come from. :-)
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Simple GUI question [message #34799 is a reply to message #34798] |
Fri, 18 April 2003 08:55 |
Pavel Romashkin
Messages: 166
Registered: April 1999
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Senior Member |
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This will be simplier than David's suggestion. Modal widget would be an
overkill here.
Change the calling order completely. Call the GUI procedure first. Event
handler can be very simple with just one "Do it" button that needs to
pass events. You can ignore events from text widgets.
Upon "Do it" event (after user entered data into all text widgets)
collect the contents from all your text widgets using widget_control,
txtWidget_ix, get_value=Data_ix and then call your data processing
function from the event handler, passing it all the Data_ix variables.
Cheers,
Pavel
"Kevin M. Lausten" wrote:
>
> I am a beginner user of IDL and results are expected soon. My current
> project begins with a GUI in which the user is prompted to input
> strings into several text widgets. I am haveing trouble passing this
> data from the GUI to my source code. The first line of my source code
> calls the GUI, and I need subsequent lines to perform procedures and
> functions on the data provided by the user. Any help would be greatly
> appreciated.
> Thank you,
> Kevin
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| Re: Simple GUI question [message #34800 is a reply to message #34799] |
Fri, 18 April 2003 08:02 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Kevin M. Lausten (kevinlausten@hotmail.com) writes:
> I am a beginner user of IDL and results are expected soon. My current
> project begins with a GUI in which the user is prompted to input
> strings into several text widgets. I am haveing trouble passing this
> data from the GUI to my source code. The first line of my source code
> calls the GUI, and I need subsequent lines to perform procedures and
> functions on the data provided by the user. Any help would be greatly
> appreciated.
What you want is a modal or blocking "dialog" widget:
http://www.dfanning.com/widget_tips/modal_blocking.html
You can find an example of how to write one here:
http://www.dfanning.com/programs/textbox.pro
The example allows you to open a text widget and return
the answer to your program. Your program will be slightly
more elaborate than this, but will work on exactly the
same principles.
IDL> theName = TextBox(Label='What is your name? ', $
Value='Unknown', Cancel=cancelled)
IDL> IF NOT cancelled THEN Print, theName
Cheers,
David
P.S. The fastest way to learn about widget programming in IDL
is to get a good book. :-)
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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