Re: Re: Bug in BTable

Diez,

Weren't you talking about formally creating something like what Stefan has 
described with his IterativeSubModel?  That is, something like a formal way 
to do Parent/Child models?  IterativeSubModel seems like it fits the 
bill.  Maybe we should get IterativeSubModel into the main comp package?

Jake

At 11:26 PM 7/18/2003 +0200, you wrote:
>Hi Tim,
>
>regarding at the nested models stuff, take a look at
>org.enhydra.barracuda.contrib.sam.models.IterativeSubModel.
>
>Let me just point out how to use it. I'll assume your data is organized
>in this way:
>
>// item represents the content of one sub-element
>class Item {
>         String name;
>         ...
>}
>
>class Section {
>         String title;
>         <any other fields>
>         List items; // all items belonging to the Section
>}
>
>So each Section contains a List of Items. In your ControlEventHandler
>(here I assume, you are using BTemplateViewHandler), you get a List of
>Sections.
>
>public Object getTemplateModels() {
>         List models = new Vector();
>         List sections = <call to your business logic>;
>
>         // create the "outer" model for sections
>         TemplateModel sectionModel = new IterativeListModel("Section",
>sections) {
>                 public Object getItem(String key) {
>                         Section section = (Section)_current;
>                         if ("title".equals(key)) {
>                                 return section.title;
>                         } else {
>                                 ... all other fields of section
>                         } else if (key=="__REQ_FROM_CHILD") {
>                                 return section.items;
>                         }
>                 }
>         };
>         models.add(sectionModel);
>
>         // now the "inner" model iterating over the items
>         TemplateModel itemModel = new IterativeSubModel("Item",
>"__REQ_FROM_CHILD", sectionModel) {
>                 public Object getItem(Strin key) {
>                         Item item = (Item)_current;
>                         if ("name".equals(key)) {
>                                 return item.name;
>                         } else ... <all other fields of Item>
>                 }
>         };
>         models.add(itemModel);
>}
>
>So we have added two models, "Section" and "Item". The Item model has a
>reference to section. For details how IterativeSubModel works, take a
>look at the source.
>
>Your HTML mockup would look like:
>
><h2 class="Dir::Iterate_Start.Section Dir::Iterate_Next.Section
>Dir::Get_Data.Section.title">dummy for section's title</h2>
>
>.... and outher Get_Data's on Section Model
>
>   <ul>
>     <li class="Dir::Iterate_Start.Item Dir::Iterate_Next.Item
>Dir::Get_Data.Item.name">dummy for item's name
>     <li class="Dir::Iterate_End.Item Dir::Discard>null
>   </ul>
>
><h2 class="Dir::Iterate_End.Section Dir::Discard">null</h2>
>
>Each section produces a h2 tag and a nested ul. The ul is populated by
>the Item model.
>
>I hope this helps.
>
>Regards,
>Stefan
>
>
>
>Am Fre, 2003-07-18 um 22.05 schrieb Tim Dysinger:
> > Greetings (again),
> >
> > How complex have you all pushed the component model?  I noticed an email
> > from Jim Dow a while back that asked about build custom components.
> >
> > I have a pretty complex couple of screens to build and so far I have not
> > had any luck with build a custom component model for them.
> >
> > I would like to be able to build the following structure ->
> >
> > TemplateModel (page level model)
> >   -> BText (title)
> >   -> BList (links)
> >      -> BLink
> >   -> BList (repeating sections)
> >      -> BTemplate (section template)
> >        -> BText (section title)
> >        -> BList (list of stuff for the section)
> >          -> BText (stuff)
> >
> > -or-
> >
> > TemplateModel (page level model)
> >   -> BText (title)
> >   -> BList (links)
> >      -> BLink
> >   -> BTemplate (Iterative Model) (repeating sections)
> >        -> BText (section title)
> >        -> BTemplate (Iterative Model) (list of stuff for the section)
> >          -> BText (stuff)
> >
> > So far I have been able to manually bind any template model to a view and
> > it works great, __but__ if I try to return any BTemplate from a
> > TemplateModel it blows chunks.  I have seen tidbits of emails on "Nested
> > Directives."  Can anyone point me to any examples/pointers?  It seems that
> > you cannot return a BTemplate from a TemplateModel.
> >
> > -Tim
> >
> >
> >
> > _______________________________________________
> > Barracuda mailing list
> > [email protected]
> > http://barracudamvc.org/lists/listinfo/barracuda
>
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