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Re: EVENT_PRO [message #73772 is a reply to message #40935]

Mon, 29 November 2010 10:43

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

David Fanning wrote:
> silje writes:
>
>> Hey, I'm trying to structure my IDL program into several event
>> handlers, e.g. one procedure that opens a file, one that save data
>> etc. To do this I have used EVENT_PRO like this:
>>
>> PRO MotionControl
>>
>> tlb = WIDGET_BASE(column=1, title='MotionControl', tlb_frame_attr=1,
>> MBAR=bar )
>> file_menu = WIDGET_BUTTON(bar, VALUE='File', /MENU)
>> file_bttn1 = WIDGET_BUTTON(file_menu, VALUE='Open dataset',
>> UVALUE='OpenDat', EVENT_PRO = 'OpenData')
>> file_bttn2 = WIDGET_BUTTON(file_menu, VALUE='Save dataset',
>> UVALUE='SaveDat', EVENT_PRO = 'SaveData')
>>
>> ............................................................ ..........................
>> etc
>>
>>
>> WIDGET_CONTROL, tlb, /realize
>> XMANAGER, 'MotionControl', tlb
>>
>> end
>>
>> In this way I have one event handler that is called
>> MotionControl_event that takes care of all the events not handled by
>> specified EVENT_PRO. I don't know if this is a really bad way of
>> structuring my code, even though it does work. Can somebody give me
>> some tips?
>
> It is a perfectly OK way to structure your code,
> although you will get in trouble sooner or later
> with the names of these routines. I would read the
> "How to Name Files" article again. :-)
>
> http://www.dfanning.com/tips/namefiles.html
>
> These event handlers should have names like
> "MotionControl_SaveData" and "MotionControl_OpenData".

Or maybe "MotionControl::SaveData" and "MotionControl::OpenData" ?

Can objects be used this way in widget programming? If not, does the Catalyst library do all the necessary heavy lifting?

I'm at the tipping point of wanting to learn something new in IDL widget-y stuff now that I'm IDL-OO-enthused. Using IDL
objects has made my code design a lot easier to understand (despite the necessary increase in actual LOC) and if there's
one thing my IDL widget programs can greatly benefit from, it's better design!

cheers,

paulv

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[Message index]

		event_pro for compound widgets By: Benjamin Hornberger on Tue, 07 September 2004 10:32
		Re: EVENT_PRO By: David Fanning on Mon, 29 November 2010 11:40
		Re: EVENT_PRO By: David Fanning on Mon, 29 November 2010 11:09
		Re: EVENT_PRO By: silje on Mon, 29 November 2010 11:02
		Re: EVENT_PRO By: David Fanning on Mon, 29 November 2010 11:02
		Re: EVENT_PRO By: Paul Van Delst[1] on Mon, 29 November 2010 10:43
		Re: EVENT_PRO By: David Fanning on Mon, 29 November 2010 10:38
		Re: EVENT_PRO By: silje on Mon, 29 November 2010 09:22
		Re: EVENT_PRO By: David Fanning on Mon, 29 November 2010 08:46

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