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Re: Prob with classes, widgets and event handler [message #32932 is a reply to message #32931]

Wed, 20 November 2002 02:30

Sebastian Loebbert
Messages: 12
Registered: September 2002

Junior Member

On 19 Nov 2002 savoie@pleasenospam.nsidc.org wrote:

Hi,

thanks a lot, not returning 1 in INIT was the problem. I had a look at my
"Buidling IDL apps" and they only say "INIT should return scalar TRUE",
but they don't say anything about objects being not valid...

> Don't fear, this is a pretty common mistake. Your init function needs to
> return 1 to be a valid object. [Didn't you take out a red pen and underline
> that in your IDL Programming Techniques (Second Ed.) :) ]
>

That's exactly what I've been looking for, but the code is wrong:
In the event handler, it must be (contrary to my intuition)
Call_Method, cmd.method, cmd.object, event

> <fanning>
> button = Widget_Button(bbase, Value='Quit', $
> UVALUE={object:self, method:'Quit'})
>
> All the event handler does is get the user value and dispatch the
> event to this method of this object:
>
> PRO EVENTHANDLER, event
> Widget_Control, event.id, Get_UValue=cmd
> Call_Method, cmd.object, cmd.method, event
> END
>
> </fanning>
>

Best regards,

Sebastian

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[Message index]

		Re: Prob with classes, widgets and event handler By: David Fanning on Wed, 20 November 2002 16:50
		Re: Prob with classes, widgets and event handler By: K. Bowman on Wed, 20 November 2002 12:07
		Re: Prob with classes, widgets and event handler By: David Fanning on Wed, 20 November 2002 08:22
		Re: Prob with classes, widgets and event handler By: James Kuyper on Wed, 20 November 2002 08:07
		Re: Prob with classes, widgets and event handler By: David Fanning on Wed, 20 November 2002 05:22
		Re: Prob with classes, widgets and event handler By: Sebastian Loebbert on Wed, 20 November 2002 02:30
		Re: Prob with classes, widgets and event handler By: David Fanning on Tue, 19 November 2002 09:52
		Re: Prob with classes, widgets and event handler By: savoie on Tue, 19 November 2002 09:38

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