[Seaside-dev] Automatic registration of children?

[Julian Fitzell]

Well, how would you know whether all the subcomponents had implemented
#children without using the slow method to find them all and check?

Julian

On Wed, Aug 18, 2010 at 2:18 PM, Lukas Renggli <renggli at gmail.com> wrote:
> What about having a slow default implementation of #children that does
> exactly what you describe and that can and should be overriden as we
> do today to get efficent code?
>
> Lukas
>
> On Wednesday, August 18, 2010, Julian Fitzell <jfitzell at gmail.com> wrote:
>> Hi Nicolas,
>>
>> I've often tried to think of something like this to remove the need
>> for #children. The problem is that #children is used to support
>> #updateRoot:, #updateUrl:, both of which happen (more or less by
>> necessity, at least if you want to support streaming content) before
>> rendering.
>>
>> I've thought of having maybe a dummy rendering context so you could do
>> a fake render pass to collect the children before doing the real
>> rendering. I think this would work as long as the rendering was
>> side-effect free (it's supposed to be anyway) but I'm not sure what
>> the performance overhead would be. The stream output operations would
>> be no-ops, but any other computation, database access, etc. would
>> still end up being performed a second time.
>>
>> Julian
>>
>> 2010/8/13 Nicolas Petton <petton.nicolas at gmail.com>:
>>> Hi,
>>>
>>> Maybe I don't know Seaside enough and the following doesn't make sense,
>>> but just in case..
>>>
>>> Back when I was playing around with Seaside, I always found quite
>>> annoying to have to implement #children everywhere in my components and
>>> feared to break the back button somewhere.
>>>
>>> We recently needed a #children like method in Iliad, so I thought about
>>> other ways to do it.
>>>
>>> The idea is to use a dynamic variable (let's call it
>>> WACurrentComponent). When rendering a component, we register can
>>> children with something like:
>>>
>>> renderOn: aRenderer
>>>    self withChildrenRegistrationDo: [
>>>        ...
>>>        ...]
>>>
>>> withChildrenRegistrationDo: aBlock
>>>    children := OrderedCollection new.
>>>    WACurrentComponent value ifNotNil: [:parent |
>>>        parent registerChild: self].
>>>    WACurrentComponent use: self during: aBlock
>>>
>>> registerChild: aComponent
>>>    children add: aComponent
>>>
>>>
>>> As I said, it works fine for us but maybe it won't for Seaside :)
>>>
>>> Cheers!
>>> Nicolas
>>>
>>> _______________________________________________
>>> seaside-dev mailing list
>>> seaside-dev at lists.squeakfoundation.org
>>> http://lists.squeakfoundation.org/mailman/listinfo/seaside-dev
>>>
>>>
>> _______________________________________________
>> seaside-dev mailing list
>> seaside-dev at lists.squeakfoundation.org
>> http://lists.squeakfoundation.org/mailman/listinfo/seaside-dev
>>
>
> --
> Lukas Renggli
> www.lukas-renggli.ch
> _______________________________________________
> seaside-dev mailing list
> seaside-dev at lists.squeakfoundation.org
> http://lists.squeakfoundation.org/mailman/listinfo/seaside-dev
>