No validation with a bound NSTableView and custom NSFormatter
No validation with a bound NSTableView and custom NSFormatter
- Subject: No validation with a bound NSTableView and custom NSFormatter
- From: Ben Kennedy <email@hidden>
- Date: Tue, 01 May 2012 14:23:38 -0700
Hi all,
I have an NSTableView whose data source is bound to an NSArrayController. To one of its columns (displaying a custom type) I have attached a custom NSFormatter subclass. The NSFormatter correctly returns NO from getObjectValue:forString:error: if the supplied string is not acceptable. Despite this, however, validation is not enforced; when tabbing out of the field, the table view carries on and just assigns a null value to the corresponding property.
Even when I implement control:didFailToFormatString:errorDescription: in the NSTableView's delegate, an invalid null value is nevertheless accepted and focus moves to the next responder, despite returning NO.
My current implementation has been using an in-memory (transient) CoreData stack, but I have pared that back to simply use NSArrayController in "class" mode and behaviour is the same.
The modelled property in question is a custom class (not a plist-compliant primitive, hence in part the need for a custom NSFormatter); however, two-way behaviour in the NSTableView works fine except for the lack of validation.
I must be missing something fundamentally obvious, but I can't figure out where to approach the fix. Enlightenment would be appreciated.
thanks,
-ben
--
Ben Kennedy, chief magician
Zygoat Creative Technical Services
http://www.zygoat.ca
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