[Zope-dev] DataSkin propoerty Sheets/Providers.

[Bill Anderson]

"Phillip J. Eby" wrote:
> 
> At 07:09 PM 8/2/00 -0600, Bill Anderson wrote:
> >I think I have a decent handle on this concept, but something seems
> lacking, I hope
> >someone can clear it up :)
> >
> >So, let us say I have an object, call it a Member. :)
> >And let us say I want to be able to add a property sheet to it in a
> customizer/specialist.
> >AIUI, I should be able to add a persistent sheet provider, give it the
> name I want for the
> >sheet, and define the sheet?
> >
> >Geex, the more I write what I want to do, the less I feel I grasp it. :(
> >
> >Basically, let me put it this way:
> >I have DataSkins (ZClasses). I have one or two property sheets that I want
> most/all of the
> >DS objects to have. I don't want to have to define the property sheet in
> each and every
> >ZClass. AIUI, PersistentSheet providers can do this. I want to do it with
> the default
> >ZPatterns/LoginManager includes.
> >
> >So, am I totally clueless, or am I just looking to hard, and missing
> something blatantly
> >obvious?
> >
> 
> PersistentSheetProviders can do what you want - *but* there is one
> drawback.  PSP's have no concept of a sheet schema, so you have to add the
> sheet and set up its schema in code for *each instance*. 

Rats. :/

> The good news is,
> you can do that from an "add" trigger, by calling
> self.propertysheets.manage_addPropertySheet(id='name', xmlns=''), followed
> by self.propertysheets.get('name').manage_editProperties(...).  (You can
> even do it as a tuple expression, i.e. just seperate the two expressions
> with a comma.  Rendered in SkinScript it would look like:
> 
> WHEN OBJECT ADDED CALL
> self.propertysheets.manage_addPropertySheet(id='name',xmlns=''),
> self.propertysheets.get('name').manage_editProperties(...)
> 
> (The "..." should be replaced with appropriate parameters for
> manage_editProperties, of course.)  Unfortunately, this will not allow you
> to initialize the property sheet contents except with constant data, data
> from the instance, or from self.REQUEST.

OK, after the Wierd Al concert tonight, I'll give it a shot. :)


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