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Re: Widgets [message #17285 is a reply to message #2717]

Fri, 01 October 1999 00:00

Liam Gumley
Messages: 473
Registered: November 1994

Senior Member

Robert LeeJoice wrote:
> Question for Widget Gurus: Can I put Widget creation items in an event
> procedure? I want to be able to able to have a menu item open a new window
> that consists of a table to display some data. I have put the following in
> and it seems to work, but I'm concerned about how xmanager sees/doesn't see
> this since the widget statements are not in the "Widget Definition file".
> Is it okay and prudent to do this? I assume as long as there are no
> event_procedures in the code?

Robert,

Anytime you create a new window, the best approach is to create a
separate program to create the widgets in the window and manage events.
For example:

Main program
- Create widgets
- Manage events
- If new window is requested, call new window program

New window program
- Create widgets
- Manage events

Here's an example which creates a simple launcher for XLOADCT, which is
a separate program (see the lib directory in your IDL installation):

;---cut here---
PRO TEST_EVENT, EVENT

;- Get user value from the widget which caused the event

widget_control, event.id, get_uvalue=uvalue

;- Act on the user value

case uvalue of
'Color Table' : xloadct
else : print, 'Unrecognized widget event'
endcase

END

PRO TEST

;- Create widgets

base = widget_base(/column)
butt = widget_button(base, value='Color Table', uvalue='Color Table')
widget_control, base, /realize

;- Manage events

xmanager, 'test', base

END
;---cut here---

In the event handler procedure TEST_EVENT, XLOADCT is called if an event
is received from the 'Color Table' button. XLOADCT is written as a
separate main program so that it can be called from different modes,
such as the command line, or from within a widget program.

Even when you are creating a utility widget which is specific to your
application, it is still much better to code it as a separate IDL
program (like XLOADCT), because you can code and test it as a unit,
separate from the main program.

Cheers,
Liam.

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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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