Ok, I give up :(
I tried simplifying everything by creating a GridDataView that is a
DataView that is explicitly aware of columns and rows but this is taking
up way too much of my time and I'm getting stuck way too often.
Some points:
1) We need a component which consists of a fixed number of columns and rows.
2) Ideally, the grid is lazily-initialized *once* with a DataItem in
each cell at the first request. Future requests do not modify the grid
structure.
3) We *don't* invoke populateItem(DataItem) and have to add() into the
item because as we have seen this is error prone. Users expect to add()
directly onto the component, not the DataItem and as Igor mentioned,
there are problems with allowing Component.add() to be invoked. So...
4) All cells always exist, whether or not there is a live item inside them.
5) At request-time, DataItems get re-rendered. At render time, DataItems
should reinitialize themselves from the DB -- this means images might
change or an image that used to exist no longer does. DataItems would be
responsible for invoking setVisible() on themselves based upon whether
or not there is an item to render.
I like the above design because it is more consistent with the Wicket
framework. The structure is created *once* at initialization time. Users
get to add() directly onto components and there is no longer any
confusion -- no need to item.add().
My only problem is that I am not familiar with how OrderedRepeatingView
works in order to figure out how to implement all of this. I don't think
extending the existing DataView is an option -- it is just too
different. I would be glad to work with Phil or Igor to make the above
work -- I cannot do it all by myself.
Thanks,
Gili
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