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Re: In catalyst, how do I decide which object need to be destroyed by hand? [message #67162 is a reply to message #67161]

Thu, 02 July 2009 09:56

Dave[4]
Messages: 38
Registered: December 2007

Member

On Jul 1, 11:49 pm, David Fanning <n...@dfanning.com> wrote:
> Dave writes:
>> In catalyst, how do I decide which object need to be destroyed by
>> hand? Because I find some objects, such as ButtonWidget, can destroy
>> itself. But others, such as SelectableDrawWidget and IMGAXES, need to
>> destroyed in cleanup procedure. Thanks very much!
>
> You must be writing your Catalyst programs differently
> than I am. :-)
>
> I don't find that *any* of the Catalyst objects need
> to be destroyed by hand, if they are properly added to
> the widget container hierarchy as they are created.
> (The top of any Catalyst program I build is a TopLevelBase
> object.)
>
> If you are creating an object that is going to have
> a "has a" relationship to a Catalyst object, the object
> must register interest in the Catalyst object by making
> itself the parent of the Catalyst object. Then, in your
> cleanup method, you simply remove yourself as the parent
> of the Catalyst object. If this is the only parent, the
> Catalyst object should be destroyed automatically.
>
> Perhaps you can give me some indication of how you are using
> these objects that aren't cleaning themselves up.
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Coyote's Guide to IDL Programming (www.dfanning.com)
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

David:
I read your imgwin example. There are following code:

PRO ImgWin::CLEANUP

@cat_pro_error_handler

IF Obj_Valid(self.theImage) THEN self.theImage -> RemoveParent,
self
Obj_Destroy, self.theDrawWidget
Obj_Destroy, self.theAxes
Obj_Destroy, self._statusbar

self -> TOPLEVELBASE::Cleanup

self -> Report, /Completed

END

So I think that you destroy self.theDrawWidget, self.theAxes and
self._statusbar by hand. Am I right?

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[Message index]

		Re: In catalyst, how do I decide which object need to be destroyed by hand? By: Dave[4] on Thu, 02 July 2009 17:17
		Re: In catalyst, how do I decide which object need to be destroyed by hand? By: David Fanning on Thu, 02 July 2009 10:51
		Re: In catalyst, how do I decide which object need to be destroyed by hand? By: Dave[4] on Thu, 02 July 2009 09:56
		Re: In catalyst, how do I decide which object need to be destroyed by hand? By: David Fanning on Wed, 01 July 2009 08:49

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