Re: Mail-like grouping in NSTableView?
Re: Mail-like grouping in NSTableView?
- Subject: Re: Mail-like grouping in NSTableView?
- From: glenn andreas <email@hidden>
- Date: Wed, 13 Feb 2008 09:49:15 -0600
On Feb 13, 2008, at 9:34 AM, Jens Miltner wrote:
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.
Since the row object an NSOutlineView uses could be as simple as an
NSNumber that contains the database entry number, I don't really see
that big of a problem with 100,000+ objects (an NSNumber is holding an
int is probably on the magnitude of 16 bytes or so, so we're talking
1.6 megs of memory - not all that much). You would still then fetch
the data as needed (in the various NSOutlineView datasource methods).
Definitely would be easier than trying to do an pseudo-outline view of
your own...
Glenn Andreas email@hidden
<http://www.gandreas.com/> wicked fun!
quadrium2 | build, mutate, evolve, animate | images, textures,
fractals, art
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