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Disposing of the parent when the children are disposed [message #455156]

Sun, 08 May 2005 08:22

Eclipse User

Originally posted by: jjdorney.hotmail.com

Backwards, I know, but I want to do it. Any suggestions?

I started off by creating a DisposeListener that maintained a reference
to the parent object and disposed it when widgetDisposed was called.

That got me an infinite loop as the parent disposed of the child, that
was disposing of the parent, that ... etc..

I stopped most of the infinite loop by changing the listener so that it
detected when it was being called a second time and did nothing on that
call.

That left me with a NullReference error ... which I'm not entirely sure
of. It had something to do with a deregister called on a Control.

I'm stumped. Does anyone have a solution to this? How do I dispose of
a parent when its child has been disposed?

Thanks
Jervina

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Re: Disposing of the parent when the children are disposed [message #455182 is a reply to message #455156]

Mon, 09 May 2005 23:03

Steve Northover

Messages: 1636
Registered: July 2009

Senior Member

Doing it inside a Display.asyncExec() should work.

"J. Dorney" <jjdorney@hotmail.com> wrote in message
news:d5kill$gq$1@news.eclipse.org...
> Backwards, I know, but I want to do it. Any suggestions?
>
> I started off by creating a DisposeListener that maintained a reference
> to the parent object and disposed it when widgetDisposed was called.
>
> That got me an infinite loop as the parent disposed of the child, that
> was disposing of the parent, that ... etc..
>
> I stopped most of the infinite loop by changing the listener so that it
> detected when it was being called a second time and did nothing on that
> call.
>
> That left me with a NullReference error ... which I'm not entirely sure
> of. It had something to do with a deregister called on a Control.
>
> I'm stumped. Does anyone have a solution to this? How do I dispose of
> a parent when its child has been disposed?
>
> Thanks
> Jervina
>
>

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Re: Disposing of the parent when the children are disposed [message #455188 is a reply to message #455182]

Tue, 10 May 2005 03:17

Eclipse User

Originally posted by: jjdorney.hotmail.com

"Steve Northover" <steve_northover@ca.ibm.com> wrote in message
news:d5oqmj$e8v$1@news.eclipse.org...
> Doing it inside a Display.asyncExec() should work.
[snip]

Oh. Okay, I feel stupid :). I was doing one of those during my
ill-fated attempt to having the parent poll its child to determine
whether it was disposed or not. That didn't end up being a good idea.
It never occurred to me to just use it for disposing the parent.

Thanks. I'll try that now.
Jervina

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