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Re: Widget question [message #16144 is a reply to message #1496]

Fri, 02 July 1999 00:00

Liam Gumley
Messages: 473
Registered: November 1994

Senior Member

Harald Frey wrote:
>
> Sorry if I missed that point somewhere in the very interesting
> discussion about "Passing info and destroying widgets". I followed the
> suggestion by Liam Gumley to create my widget structure but now I have a
> problem.
>
> I have 3 levels in my widget structure, main, parent and child. What I
> do is:
>
> - Create main widget
> - Create info structure
> - store info structure in the main level base
> - start Xmanager with event handler
>
> A certain button on the main widget calls the parent process where I
> - get the info structure
> - create the parent widget
> - create a pointer to the info structure
> - store pointer in parent base
> - start second Xmanager with second event handler
>
> Now a button on the parent widget calls a process on the child level
> where I
> - get the pointer
> - get the info structure via pointer
> - manipulate the info
>
> So far everything is fine but now I want to store the manipulated info
> from the child level back into the main widget and destroy the parent
> widget. How do I do this?

I use the following method in event handlers:

PRO MYPROG_EVENT, EVENT

;- Get the info pointer

widget_control, event.top, get_uvalue=info_ptr

;- Get the info structure

info = *info_ptr

;- Manage widget events, and change info structure...

;- Save the info structure

*info_ptr = info

END

If I create child widgets which are spawned from the top level widget,
then I pass the ID of the top level widget (event.top) to the child,
e.g.

PRO MYPROG_CHILD, TOP

;- Get the info structure

widget_control, top, get_uvalue=info_ptr

;- Get the info structure

info = *info_ptr

;- Modify items in the info structure...

;- Save the info structure

*info_ptr = info

As long as you remember to get/save the info structure, you won't have
any problems. This method is a holdover from the days of handles, where
managing info structures in this way was mandatory.

Cheers,
Liam.

--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley

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[Message index]

		Widget Question By: scollick on Thu, 16 September 1993 17:09
		Re: WIDGET QUESTION By: stl on Tue, 28 June 1994 01:05
		Re: WIDGET QUESTION By: crdmi on Mon, 27 June 1994 09:38
		Re: WIDGET QUESTION By: fskmjm on Mon, 27 June 1994 08:58
		Re: postscript By: dan on Tue, 20 September 1994 11:11
		Re: WIDGET QUESTION By: crdmi on Thu, 23 June 1994 11:35
		Re: Widget question By: Liam Gumley on Mon, 30 June 1997 00:00
		Re: Widget question By: gabriel rodriguez ibe on Thu, 01 July 1999 00:00
		Re: Widget question By: davidf on Fri, 02 July 1999 00:00
		Re: Widget question By: Liam Gumley on Fri, 02 July 1999 00:00
		Re: Widget Question By: Brian Wolven on Thu, 09 June 2011 13:53
		Re: Widget Question By: David Fanning on Thu, 09 June 2011 13:41

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