From: Sam Stigler <email@hidden>
Date: May 24, 2007 2:28:18 AM GMT+10:00
To: Cocoa Developers Developers <email@hidden>
Cc: Jerry Krinock <email@hidden>
I was going to write out an answer saying it would be very simple,
etc. using a set of reverse value transformers and NSString, but
then I realized that you can't access ivars from value transformers.
Having realized that, your best option might be, hard as it to
say, simply not to use bindings in this case. The other option is
to see if you can find a way to subclass whatever you're inserting
things into (I assume an NSArrayController) to allow for custom
behavior (such as appending text etc.) when something is inserted.
If you can find a way to do this, you could write a value
transformer for firstName that adds a "_f_" (for example) before
it, and another one for lastName that adds a "_l_" before it -- all
you'd really need is some hint to know how to manipulate the
fullName string. Or, if you don't want to take the risk that your
user won't put in that prefix, you could make your
transformedValueClass be a dictionary with two values: The
original string as passed in, and whether it is a firstName or a
lastName. You could then handle those in your custom insert (or
add?) method.
I'm sorry, I haven't looked at the documentation for
NSArrayController recently. I hope this helps.
-Sam
http://www.stigler.org/sam/wordpress
On May 24, 2007, at 1:44 AM, Jerry Krinock wrote:
Say that I have an NSTableView with two columns, firstName and
lastName. Say that some marketing hack insists that I store these
combined as one string.
For the last hour, I've been trying to figure out how to bind two
table columns such as this to a single string in storage,
bidirectionally, using Cocoa bindings. But I keep running into a
wall, trying to transform two objects into one. What's the smart
way to do this?
Thanks,
Jerry Krinock
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