Re: Selections and NSCollectionView
Re: Selections and NSCollectionView
- Subject: Re: Selections and NSCollectionView
- From: "Tom Harrington" <email@hidden>
- Date: Wed, 2 Jan 2008 12:52:10 -0700
On Dec 30, 2007 6:04 PM, Rod Schmidt <email@hidden> wrote:
> I've read this thread:
>
> http://lists.apple.com/archives/Cocoa-dev/2007/Nov/msg02158.html
>
> but I can't figure out how to do it. I've exposed bindings, called
> bind:..., tried and observer, and my selected property in my view
> doesn't get set. Could somebody please post some sample code.
To give visual feedback of selection, I added an NSBox behind (but not
containing) the other elements in the view that the collection view
item is using. In IB, I bound the NSBox's "hidden" property to the
collection view item's "selected" key (with a boolean negation value
transformer). That gives me simple visual feedback of the selected
item-- the NSBox is only visible when the view is selected, and I can
configure the NSBox's appearance as needed. I didn't have to expose
any bindings because NSBox already exposes the one I needed.
To get notification of selection changes-- the collection view's
"selection indexes" binding is bound to the selectionIndexes key of
the array controller I'm using to manage the content. In my app
controller class I observe changes on this key in the array
controller. Then I can ask the array controller for its
currently-selected indexes to get the appropriate model objects.
--
Tom Harrington
email@hidden
AIM: atomicbird1
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