Re: Binding to title of NSButtonCell in a table view
Re: Binding to title of NSButtonCell in a table view
- Subject: Re: Binding to title of NSButtonCell in a table view
- From: Gideon King <email@hidden>
- Date: Sun, 18 Jul 2010 19:09:02 +1000
Thanks for the suggestion Quincey - I have just finished implementing an NSTableColumn subclass which does the observing etc, and is working nicely, but as you say, it's not the neatest solution. Your idea sounds like an interesting one to pursue - I could just make up a dummy property that uses the valuesAffecting thing to trigger the update at appropriate times and do the work in the tableView's delegate. A lot less code to debug...
(and at the same time, I would have thought that the frameworks should have made binding to the title of a button cell a trivial thing to do...)
Gideon
On 18/07/2010, at 6:33 PM, Quincey Morris wrote:
>
> I think this is unnecessarily complicated. I'd first be inclined to try a much simpler approach. Make the data model property that the table column's "value" is bound to be KVO-dependent on the data model title property. You can likely do this just by defining a +keyPathsForValueAffecting<MyValueProperty> method that returns the title property key, in the relevant data model class.
>
> That means that if either the value changes or the title changes, a KVO notification is sent to the table column, which causes the corresponding row to be redisplayed. That in turn causes the data cell to be prepared, and so your dataCellForTableColumn delegate method would be invoked, allowing you to transfer the correct title to the button cell.
>
> I'd seriously try to avoid any solution that involves manually adding KVO observers and removing them later.
>
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