So, I really think there must be a 'proper' way to get the editor to
pick up and return the value (name) I need editing from my cell's
model object, but I'm still searching for the white magic, having
dabbled in the darker sort.
OK, I think I finally (mostly) grokked it.
The NSCell subclass can pretend it was given a string object (the name
of the actual bound object) and palm this off on its superclass
(NSTextFieldCell). The actual object given can be stashed in
'representedObject', so long as you remember to copy this in
copyWithZone: and this can be used to drive all the extras in any
custom drawing code for the cell.
You can pick up the string at the end of editing, with the cell's
"endEditing:"
So I have code like this:
- (id)copyWithZone:(NSZone *)zone {
NSCell *newCell = [super copyWithZone:zone];
[newCell setRepresentedObject:[self representedObject]];
return newCell;
}
- (void)setObjectValue:(id)object {
if ([object isKindOfClass:[Thing class]]) {
[self setRepresentedObject:object];
[super setObjectValue:[object name]];
}
}
- (void)endEditing:(NSText *)textObj {
[super endEditing:textObj];
// Set the representedObject's text
[[self representedObject] setValue:[textObj string]
forKey:@"name"];
}
Thankfully there's no messing with (abusing?) NSFormatter subclasses
this way,
The only remaining fly in the ointment is that the model object
("Thing" class here, the object stored in representedObject) still
gets a KVC message to set the OLD value of cell to the "" (empty
string) key, which I currently just defend against, ignoring the
value. I'd love to know how to prevent this from happening.
-- lwe
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