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Re: Widget Definition from the Event Handler? [message #55924]

Thu, 13 September 2007 08:39

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

2d@onetel.com writes:

> As i understand it, in a widget program the control goes initially to
> the Widget Definition Module and then through the xmanager to the
> Event Handler. However, how does IDL cope when it becomes necessary in
> the Event Handler part of the program to redfine a widget, say for
> example, when a table widget requires more elements? Is is possible
> through an Event Handler to redefine the dimension of a table widget,
> or must all widgets be defined absolutly in the initial Widget
> Definition Module?

Well, sort of. I'm not sure control "goes" anywhere.
Widgets appear on the display, and if events "occur"
in those widgets, IDL dispatches them to the proper event
handler. (XManager often doesn't even have to be involved.)

But it is true that you can create or modify widgets in
any IDL procedure or function that you like, including
in event handlers. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Widget Definition from the Event Handler? By: David Fanning on Thu, 13 September 2007 08:39
		Re: Widget Definition from the Event Handler? By: Mike[2] on Thu, 13 September 2007 07:56
		Re: Widget Definition from the Event Handler? By: 2d on Fri, 19 October 2007 06:26

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