| Re: pop up widget [message #16520 is a reply to message #16446] |
Wed, 28 July 1999 00:00  |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Arno R. Schleich (warschew@zedat.fu-berlin.de) writes:
> I am looking for a technique to produce a widget with the following
> characteristics:
>
> 1.) It pops up upon fulfillment of a certain program condition
> 2.) It always stays in front
> 3.) No user interaction can take place with the widget or with the
> remaining widgets of the program
> 4.) The widget disappears automatically after a limited period of time
> and normal interaction with the remaining widgets is going to take place
> again
After thinking about this for quite some time, I've decided
this is probably NOT what you want. (I have a friend who
says that prayer is so powerful you shouldn't try it more
than once or twice a year. You might actually get what you
want and then you would be in REAL trouble.)
But, because I'm a nice guy, I've given you both what
you asked for and what you probably need in the same program. :-)
Ever since someone asked about a Show Progress indicator the
other day, I've been thinking that this should really be
done as an object. This question gave me the opportunity
to write something up. While I was at it, I decided to
add the sort of blocking action you refer to above. I
call this the AutoUpDate mode. But I think you will probably
find the Normal mode more useful to you.
Those of you who have fooled around with my ShowProgress
program (which I have always found way too hard to understand
how to use, even after I wrote the darn thing), will be
pleased with the ease of use that this object provides.
Here is the essence of how it works, in a bit of the
documentation header:
; PROCEDURE:
; There are two modes. In AutoUpDate mode, a delay and number of steps is
; required. The modal widget stays on the display until the total time
; exceeds the DELAY or the requested number of STEPS is taken. A TIMER
; widget is used to generate update events. Nothing can be going on
; concurrently in AutoUpDate mode. To enter AutoUpDate mode, type this:
;
; progressBar = Obj_New("SHOWPROGRESS", /AutoUpDate, Delay=2, Steps=10)
; progressBar->Start
; Obj_Destroy, progressBar
;
; In normal mode, the user is responsible for starting, updating, and
; destroying the progress indicator. The sequence of commands might look
; like this:
;
; progressBar = Obj_New("SHOWPROGRESS")
; progressBar->Start
; FOR j=0,9 DO BEGIN
; Wait, 0.5 ; Would probably be doing something ELSE here!
; progressBar->Update, (j+1)*10
; ENDFOR
; progressBar->Destroy
; Obj_Destroy, progressBar
;
; Normal mode gives you the opportunity to update the Progress Bar
; in a loop while something else is going on. See the example program
; at the end of this file.
I've included a short example program at the end of the file,
so you can quickly see how things are done. Just compile the
file and type "EXAMPLE":
IDL> .Compile showprogress__define
IDL> Example
I haven't done any extensive testing of this program. (Indeed, I've
spent WAY too much time on it as it is.) So, if you find a bug, let
me know. (If you could fix it too, I would be most appreciative.)
You can find the program here:
ftp://www.dfanning.com/pub/dfanning/outgoing/misc/showprogre ss__define.pro
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@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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