Use of #delegate w/ WADelegation or WADecorator

Hi all..

I'm toying around w/ using decorators in the latest (vw) Seaside 2.7 (as
of a few days ago) and in trying to plug into a new decorator I tried
writing, I find that the #delegate instance variable is not set so that
causes a DNU trying to call #nextPresentersDo: after I use
#addDecoration: for the decorator in question..  For regular
delegates/decorations, how is that variable set.. I've been staring at
code for the past several hours and I'm afraid I just don't see who's
setting it in some of the examples..  I was looking at some of the code
in Scriptaculous as well but nothing is jumping out at me..
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> I'm toying around w/ using decorators in the latest (vw) Seaside 2.7 (as
> of a few days ago) and in trying to plug into a new decorator I tried
> writing, I find that the #delegate instance variable is not set so that
> causes a DNU trying to call #nextPresentersDo: after I use
> #addDecoration: for the decorator in question..  For regular
> delegates/decorations, how is that variable set.. I've been staring at
> code for the past several hours and I'm afraid I just don't see who's
> setting it in some of the examples..  I was looking at some of the code
> in Scriptaculous as well but nothing is jumping out at me..

Have a look at the senders of #delegate:, in my image these are
#show:onAnswer: and #lightbox:. The delegation decoration is used to
delegate rendering, callback processing, url updating, etc. to a
different component. So the delegate is an instance of a WAComponent.

When you do a #call: the receiver is wrapped with the delegation
decoration, so that the argument is then displayed (instead of the
receiver). When you #answer: the decoration is removed again and the
receiver is displayed again (as you can see in #call:, #show:,
#show:onAnswer: and #show:onAnswer:decoration:).

I don't see a reason to use the WADelegation manually. This is just a
helper to implement #call: and #answer:.

Cheers,
Lukas

--
Lukas Renggli
http://www.lukas-renggli.ch
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Lukas Renggli wrote: Thanks Lukas -- I might need to instead have my toy code have a parent
class of WADecorator
instead of WADelegation since the usage is not likely to be used in that
manner.. I had been
looking at other code and I guess I got a bit confused between the two..
I'll take another peek
and some more fiddling around.  Thanks!

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