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Re: In catalyst, how do I decide which object need to be destroyed by hand? [message #67167 is a reply to message #67162]

Wed, 01 July 2009 08:49

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

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.")

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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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