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Mail-like grouping in NSTableView?



Hi,

I'm pondering how to best approach implementing something like Apple Mail's "Group by Thread" display mode:
I have a database view (which potentially can contain large amounts of rows), and I would like to group them by some criteria.
Due to the amount of data that _may_ be displayed (not that it necessarily makes sense), I believe using an NSOutlineView is probably ruled out due to it's reliance on one object per row (I don't want to have to allocate 100,000+ objects). In the current "flat" list that is used, we don't keep objects per row, but rather fetch the data directly from a database as it's needed.


The main obstacle I can think of when trying to implement the grouping using a plain NSTableView is the ordering, where I'd need to make sure the group sticks together even when sorted by some other criteria than the one that specifies the grouping (think of e.g. sorting e-mails by date in Apple Mail with "Group by Thread" enabled).

Any ideas how to best approach this?

Thanks,
</jum>


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