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Article #17777

Re: Doubble buffering in a canvas.

#17777
From: Hando
Date: Thu, 01 Oct 1998 00:00
49 lines
2643 bytes
I'll forward your answers to faq maintainer for a response. I wasn't
really trying to recomend one way or another, just bringing a different
opinion into view.

Cheers,

Stuart

John P. McGrath wrote:
> 
> Hando <hando@tig.com.au> wrote:
> 
> > From the Java programmers FAQ http://www.afu.com/javafaq.html
> 
> > Javasoft recommends against explicit calling (and, presumably
> > overriding also) of addNotify() by applications programmers -
> > this is especially important in these days of Lightweight
> > components that do not have peers. If you have any code that
> > requires peer resources, move it into a thread that is started
> > from a conditional branch of the paint() or update() method.
> 
> I have seen recommendations that application code not directly
> call addNotify(), although I have seen exactly this technique
> presented in "Core Java Foundation Classes".  This series of Java
> books is certainly regarded as one of the best Java book series.
> 
> I have never before seen anyone suggest that addNotify() should
> not be overridden, and I am not sure why the FAQ author would
> presume that Javasoft recommends against it.
> 
> But I have seen this done countless times.  Because many of the
> resources associated with a component are not available until the
> peer is created, this is, as far as I know, the best place to
> perform certain operations.  If you have a better recommendation
> as to where to do this, please post a message describing it.
> 
> Also, the FAQ you quoted seems to suggest that Lightweight
> components do not a peer, and thus addNotify() will not be
> called.  Actually, lightweight components do have a peer, but it
> is an instance of java.awt.LightweightPeer.  And addNotify() does
> get called for lightweight components, just as for heavyweight
> ones.
> 
> --
> Regards,
> 
> John P. McGrath
> <mcgrath@enter.net>
> <jpm@nscs.fast.net>
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From: Hando <hando@tig.com.au>
Subject: Re: Doubble buffering in a canvas.
Date: 1998/10/01
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