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Re: Dynamically adding and removing widgets [message #46469 is a reply to message #46467]

Wed, 23 November 2005 09:58

Antonio Santiago
Messages: 201
Registered: February 2004

Senior Member

> 4. One of my event handlers calls a procedure called
> show_phenomenon
>
> pro event_handler Event
> ----
> WIDGET_CONTROL,Event.TOP,SET_UVALUE=state,/NO_COPY
> show_phenomenon,.....,....,Event
> ----
> end
>

I think your problem is with the /NO_COPY keyword, this unidefines the
"state".
See PDF manual:

"However, it has the side effect of causing the source variable to
become undefined. On a “set” operation (using the SET_UVALUE keyword to
WIDGET_CONTROL), the variable passed as value becomes undefined. On a
“get”
operation (GET_UVALUE keyword to WIDGET_CONTROL), the user value of the
widget in question becomes undefined."

Then inside your "Show_phenomenon" procedure the "state" value is
undefined.

Bye :)

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[Message index]

		Re: Dynamically adding and removing widgets By: peter.albert@gmx.de on Wed, 23 November 2005 23:16
		Re: Dynamically adding and removing widgets By: David Fanning on Wed, 23 November 2005 11:23
		Re: Dynamically adding and removing widgets By: akkiraju on Wed, 23 November 2005 10:29
		Re: Dynamically adding and removing widgets By: Antonio Santiago on Wed, 23 November 2005 09:58

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