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Re: Object Widgets [message #17688 is a reply to message #17680]

Wed, 10 November 1999 00:00

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

More on Struan's widgets. Sorry for thinking aloud on the group but I find
it all quite interesting.

I have thought of a simple (and in hindsight obvious) solution for the heap
cleanup problem for blocking widgets. Just have the Init method for blocking
widgets always return 0. That way the object exists (in some sense) while
the widget application is running but when the widget application exits it
returns to the Init method, which tells IDL that initialisation was not
successful. Sounds dodgy, but seems to work! So the Init method in Struan's
code becomes (additions in capitals):

function SLFow_minimal::init, BLOCK=BLOCK, _ref_extra=extra

if not (self->SLFoWid::init(BLOCK=BLOCK, _extra=extra)) then begin
print, 'SLFow_minimal: failed to initialise SLFoWid'
return, 0
endif

self.myWidID = widget_base(uvalue=self, title=self.title, /column,
xsize=200)
temp = widget_button(self.myWidID, value='Undefined')
self.quitbut = widget_button(self.myWidID, value='Quit')

widget_control, self.myWidID, /realize

self -> xmanage

IF KEYWORD_SET(BLOCK) THEN RETURN, 0 ELSE return, 1

end ; function SLFow_minimal::init

---
Mark Hadfield
m.hadfield@niwa.cri.nz http://katipo.niwa.cri.nz/~hadfield/
National Institute for Water and Atmospheric Research
PO Box 14-901, Wellington, New Zealand

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[Message index]

		Re: Object Widgets By: Struan Gray on Wed, 10 November 1999 00:00
		Re: Object Widgets By: Mark Hadfield on Wed, 10 November 1999 00:00
		Re: Object Widgets By: Mark Hadfield on Wed, 10 November 1999 00:00
		Re: Object Widgets By: Mark Hadfield on Wed, 10 November 1999 00:00
		Re: Object Widgets By: davidf on Mon, 08 November 1999 00:00
		Re: Object Widgets By: Pavel Romashkin on Mon, 08 November 1999 00:00
		Re: Object Widgets By: Struan Gray on Thu, 11 November 1999 00:00
		Re: Object Widgets By: Struan Gray on Thu, 11 November 1999 00:00
		Re: Object Widgets By: Struan Gray on Mon, 08 November 1999 00:00
		Re: Object Widgets By: davidf on Sun, 07 November 1999 00:00
		Re: Object Widgets By: davidf on Sun, 07 November 1999 00:00
		Re: Object Widgets By: J.D. Smith on Wed, 10 November 1999 00:00

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