Perhaps I just can't get my head around the terminology sufficiently
to search on the right thing...feel free to enlighten me.
I have an NSTableView, whose content is supplied through bindings to
an array controller. Column A is supplied via
FieldListController.arrangedObjects.name, Column B via
FieldListController.arrangedObjects.value; column B is editable,
column A is not.
I'm trying to observe when a cell in Column B is edited by
[thing addObserver:self
forKeyPath:@"fieldList"
options:(NSKeyValueObservingOptionOld |
NSKeyValueObservingOptionNew)
context:nil];
When I edit a field (by double-clicking it) and commit the edit
(pressing Return), in my -
observeValueForKeyPath:ofObject:change:context: method, "keyPath" is
"fieldList" and "object" is the object that owns the fieldList that is
being observed.
The NSKeyValueChangeKindKey in the change dictionary is
NSKeyValueChangeSetting; NSKeyValueChangeNewKey and
NSKeyValueChangeOldKey are both arrays containing all the observed
fields in "fieldList". But those "fields" are not the values that are
being edited, they are the objects which contain the values that are
being edited (i.e., [field value] is what's getting edited (and [field
name] is what's displayed in Column A).
OK, so all that makes sense, in that I'm observing "fieldList", and
the notification hands me an array (which is fieldList). However, it
doesn't tell me *which* field in the array was edited; I have to
iterate over all the fields, comparing the values from "old" and "new"
to figure out which specific field was edited.
I tried changing the observed keyPath to @"fieldList.value", but that
only succeeded in having the table not display anything at all (which
doesn't make sense to me either).
Is it possible to know exactly which array element was edited, without
registering observers on the entire contents of the array? I figure
it has something to do with the keyPath, but the exact something has
thus far eluded me.
Thanks!
randy
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