Re: NSImageView and CoreData entity creation
Re: NSImageView and CoreData entity creation
- Subject: Re: NSImageView and CoreData entity creation
- From: Chris Hanson <email@hidden>
- Date: Sun, 18 Sep 2005 03:02:28 -0700
On Sep 17, 2005, at 8:55 AM, Eric Friedman wrote:
In my nib, there is master-detail view for Person objects. In the
detail area, I have an NSImageView whose data binding is pointed to
selection.picture.data.
I would like users to be able to drag and drop pictures onto this
NSImageView and have that do several things at once: (a) instantiate
a Picture; (b) set the selected Person's relationship attribute to
point to that instance; and (c) store the dropped image in the
Picture's data attribute.
Rather than subclassing a view-layer class, such as NSImageView, I'd
probably do this kind of work at the model or controller layer.
If every Person has an associated Picture, I might use a custom
NSManagedObject subclass to represent a Person and override -
awakeFromInsert to create an associated Picture right off the bat.
Another possible strategy is to use a transient attribute on Person
to represent the image data temporarily (e.g. "pictureData") and to
fill this in upon fetch (via -awakeFromFetch) and save (via -willSave).
Finally, one could always introduce an intermediate controller object
(not necessarily an NSController) to handle the NSImageView
associated with a Person's Picture without subclassing NSImageView
itself.
-- Chris
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