Pier Magritte with pragmas porting woes

[Lukas Renggli]

On 19 January 2012 09:47, Nick Ager <nick.ager at gmail.com> wrote:
> Just when it was all going so well....  I started trying to port Pier to use
> Magritte with pragmas and hit some issues:
>
> Pier structures are instantiated with snippets of code thus:
>
> addChild: ((PRComponent named: 'children')
> componentClass: PRChildrenWidget;
> write: 1 using: PRChildrenWidget descriptionLevel;
> yourself);
>
>
> the description is no longer defined on the class side so the above doesn't
> work. Superficially a quick solution might be modify the code thus:
>
> addChild: ((PRComponent named: 'children')
> componentClass: PRChildrenWidget;
> write: 1 using: (PRChildrenWidget new) descriptionLevel;
> yourself);
>
>
> However within PRComponent the method PRComponent>>#componentDescription
> currently uses the componentClass to generate the descriptions. Again this
> could be modified to create an instance and retrieve the descriptions from
> the instance. However I started to wonder if there is a better way, rather
> than creating numerous temporary instances for extracting the descriptions.
> My initial idea is to pass a prototypical instance instance to PRComponent
> with the default values set, this would then eliminate the need to create
> multiple instances for description retrieval - the descriptions can be
> retrieved directly from the prototypical instance. The above code would then
> be something like:
>
> addChild: ((PRComponent named: 'children')
> prototypeInstance: ((PRChildrenWidget new) descriptionLevel: 1; yourself);
> yourself);
>
>
> Then I run into more issues as PRChildrenWidget doesn't currently have write
> accessors for described properties (nor do any objects derived from
> PRWidget), clearly that could be fixed ... but I'm starting to wonder if I'm
> going down a sensible path and the modifications required simply fall out of
> having instance-side descriptions or if I'm heading completely in the wrong
> direction.
>
> Thoughts?

I would add a method Object>>#write:usingNamed:

Lukas


>
> Nick
>
> _______________________________________________
> Magritte, Pier and Related Tools ...
> https://www.iam.unibe.ch/mailman/listinfo/smallwiki



-- 
Lukas Renggli
www.lukas-renggli.ch