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Newbie questin regarding Widget timers [message #62187]

Thu, 28 August 2008 11:49

Mike Potter
Messages: 19
Registered: August 2008

Junior Member

I'm working through some of the example code and am trying to
understand the utility of how "animation_doc.pro" uses widget timer
events.

On line 251 of the procedure is the statement:

WIDGET_CONTROL, wBase, TIMER=1

Lines 107-111 in the event procedure capture such events and
generate a new Widget timer event:

IF (TAG_NAMES(sEvent, /STRUC) eq 'WIDGET_TIMER') THEN BEGIN
WIDGET_CONTROL, sEvent.top, GET_UVALUE=pState
; WIDGET_CONTROL, (*pState).wBase, TIMER=1
return
ENDIF

It looks to me that this just continuously fires timer events every
second that do nothing. I commented out the lines mentioned and the
application still runs just fine. So what is the utility of this?

Thanks for you help!

Mike Potter

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