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Re: WIDGETS [message #2895 is a reply to message #2717]

Thu, 01 September 1994 10:30

zawodny
Messages: 121
Registered: August 1992

Senior Member

In article <344g63$b8r@sun4.bham.ac.uk> sjt@xun8.sr.bham.ac.uk (James Tappin) writes:
> mallozzi@ssl.msfc.nasa.gov wrote:
> : I recently began to use IDL WIDGETS (on DEC ALPHA) and I have a minor
> : problem: I created a base WIDGET with multiple editable text children
> : to be used as
> : an editable menu. I invoke the WIDGET and register it with XMANAGER, with
> : the keyword JUST_REG. When I want control of the WIDGET, I type
> : XMANAGER, widget_id. The problem is as follows: I want to be able to
> : desensitize some of the children, so the user can only alter a single
> : menu entry (I am running a complicated IDL code
> : concurrently). I thought I could destroy the WIDGET and rebuild it with
> : only one child sensitive. Is this possible, or is there a more
> : appropriate method? Thanks -Bob
>
> If you save the ID's of the widgets which you want to change in a common
> block, then you can just use WIDGET_CONTROL, SENSITIVE=1 (or 0) to
> (de)sensitize the relevant widgets.
>
> --
> James Tappin,

No, no, no! You should avoid using common blocks in widget programming. I
sense and desense widgets of all sorts routinely. My personal preference
is to create a structure with one of the fields set to be a long integer
array and I store the widget id's of the widgets I need to manipulate or
(de)sensitize in this array (the structure is required only if you need to
pass other data besides the widget id's). That way a simple

widget_control,event.id,get_uvalue=array

statement gets the info I need without using common blocks. The problem is
that you might have multiple versions of the same widget running
concurrently. If you do and use common blocks to pass data between
widgets, the common blocks can (and do) get scrambled.

--
Joseph M. Zawodny (KO4LW) NASA Langley Research Center
Internet: zawodny@arbd0.larc.nasa.gov MS-475, Hampton VA, 23681-0001
TCP/IP: ko4lw@ko4lw.ampr.org Packet: ko4lw@n4hog.va.usa

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[Message index]

		WIDGETS By: mallozzi on Tue, 30 August 1994 10:23
		Re: Widgets By: rivers on Thu, 22 September 1994 21:05
		Re: Widgets By: rouse on Sun, 18 September 1994 23:50
		Re: WIDGETS By: peter on Thu, 01 September 1994 14:03
		Re: WIDGETS By: zawodny on Thu, 01 September 1994 10:30
		Re: WIDGETS By: sjt on Thu, 01 September 1994 05:07
		Re: Widgets By: offenbrg on Wed, 07 February 1996 00:00
		Re: Widgets By: todd on Wed, 07 February 1996 00:00
		Re: Widgets By: davidf on Sun, 03 October 1999 00:00
		Re: Widgets By: Liam Gumley on Fri, 01 October 1999 00:00
		Re: Widgets By: Richard G. French on Thu, 07 October 1999 00:00
		Re: Widgets By: mgs on Wed, 06 October 1999 00:00
		Re: Widgets By: Robert LeeJoice on Wed, 06 October 1999 00:00
		Re: Widgets By: Richard G. French on Sun, 10 October 1999 00:00
		Re: Widgets By: davidf on Sat, 09 October 1999 00:00
		Re: widgets By: davidf on Fri, 18 August 2000 00:00
		Re: Widgets By: Rick Towler on Thu, 30 May 2002 08:11
		Re: Widgets By: David Fanning on Wed, 29 May 2002 11:24
		Re: widgets By: David Fanning on Fri, 19 August 2005 08:02

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