| Re: How to cleanup an object with a non-modal widget method [message #88083 is a reply to message #88082] |
Wed, 19 March 2014 05:29   |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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David Fanning writes:
>
> wlandsman writes:
>
>> Well, one of the methods of the object creates the widget. So I'd say that the object contains the widget, which is why the widget code refers to self when it needs information from the object (e.g. the top level base ID is stored in self.gui ) I don't have any object reference within the widget method which I can destroy except for self. Thanks, --Wayne
>
> I'm thinking something like this:
>
> oAstroMap = obj_new('AstroMap') ;Create the object
> oAstroMap.widgetdisplay ;Create the display widget
>
> So, I write the WidgetDisplay method like this:
>
> PRO AstroMap::WidgetDisplay
> tlb = Widget_Base(Title='MyWidget',UValue=self, $
> Kill_Notify='Widget_Cleanup')
> .... ; Doesn't matter what widget I store the object in, $
> .... ; just that it have a kill callback associated with it.
> END
>
> And, I write Widget_Cleanup like this:
>
> PRO Widget_Cleanup, widget_that_is_dying
> Widget_Control, widget_that_is_dying, Get_UValue=myObject
> Obj_Destroy, myObject
> END
Of course, in the Cleanup method of the object, you have to be careful
not to use code that works with widgets, without first testing if the
widget is actually there!
PRO AstroMap::Cleanup
IF Widget_Info(self.gui, /Valid_ID) THEN BEGIN
.... ; Widget cleanup stuff here
ENDIF
....
END
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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