On Apr 21, 2011, at 14:10, Guy Steven wrote:
> I have an NSTableView with 3 columns.
>
>
> The first contains an NSPop-up which takes as its datasource an array of
> objects with two properties, name and cost. The name is displayed.
>
> The user enters a quantity in the 2nd column.
>
> How do I go about displaying the cost in the third column? I can bind that
> column to the quantity key, but don't then know the cost, or I can bind the
> column to get the cost, but don't then know the quantity?
The simplest way is to create a derived property:
http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ModelObjects/Articles/moIntegrating.html
You can put this derived property in your data model, or if that doesn't make
sense in your application, in the window controller for the window with the
table.
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