Re: Data Source ignored after binding sortDescriptors
Re: Data Source ignored after binding sortDescriptors
- Subject: Re: Data Source ignored after binding sortDescriptors
- From: Allen Smith <email@hidden>
- Date: Tue, 9 Oct 2007 16:34:23 -0700
On Oct 9, 2007, at 2:37 PM, Keary Suska wrote:
on 10/9/07 12:09 PM, email@hidden purportedly said:
After establishing a binding for an NSTableView's sortDescriptors, my
data source methods -numberOfRowsInTableView: and -
tableView:objectValueForTableColumn:row: stop getting called. But I
haven't bound the table view's content or any columns in the table
view--just the sortDescriptors.. Is it really impossible to use a
data source to supply table values and use bindings to synchronize
the sort descriptors?
There are certain "automagical" bindings that occur when setting
certain
bindings (particularly column value bindings), and you may be
running into
one of these.
I presume you are referring to the bindings the documentation vaguely
refers to as "being created automatically when the initial
NSTableColumn binding is made." But it must be more complicated than
that; I never bound any table columns. Furthermore, when I log
[tableView infoForBinding:@"content"], etc., I get nil. Only the
binding I actually established returns any information.
Why not set an outlet and use -setSortDescriptors: instead?
Because bindings are supposed to save me the bother of writing glue
code to synchronize shared data, which in this case happens to be my
sort descriptors and selection indexes. But it would appear I have
stumbled upon a case where bindings decide to do more than advertised.
Allen
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