Peter,
Thanks for your response (I was hoping you would notice my post :-).
My interpretation of your response is as follows:
1- Cocoa bindings are not supported for popup views that are used in a
NSPredicateRowtemplate, even if I am careful to make sure that the
view is re-bound (via copyWithZone) when NSPredicateEditor creates its
copies. This is true in spite of the fact that I managed to fill the
popup via bindings upon initial creation.
2- One needs to observe the appropriate objects using KVO and then
take the steps you outlined below in order to ensure that the popup
has current values.
Can you please confirm my understanding?
Thanks,
Martin
On 22-May-09, at 10:55 PM, Peter Ammon wrote:
On May 22, 2009, at 9:37 AM, Martin Stanley wrote:
I've finally got the hang of NSPredicateEditor and custom
NSPredicateEditorRowTemplates. (It sure took a while and many, many
searches and head-scratchings). However, I am stuck on one thing
and I suspect that the problem might lie in the NSPredicateEditor
code itself; hence this post.
Here is what I am trying to do:
I have a Core Data document-based application for managing Tasks
(to-do items). I am using NSPredicateEditor to manage a set of user-
defined Smart Groups. I want the user to be able to build a
predicate based on a choice from a popup button. For example the
(sub-)predicate might look like this:
status == "Not Started"
Implementing this is straightforward enough, but I the wrinkle is
that want the right hand side of the expression to come from a core
data entity. So, no problem, when I create the NSPopUpButton (in my
custom NSPredicateEditorRowTemplate class) I simply fill the
menuitems from the appropriate array controller, which in turn gets
its data from the Core Data entity. After much learning and
experimenting, this now works. All is well.
So, then I realize that if (in another window) the user edits the
Core Data entity in question, the changes are not reflected in the
NSPredicateEditor popup. Okay, this seems like a candidate for
cocoa bindings. Again, after much searching and experimentation I
come up the following:
Hi Martin,
NSPredicateEditor does not support editing the popups like this.
What you should do, when the available values in the popup need to
change, is create a new NSPredicateEditorRowTemplate that reflects
the change, and set it on the NSPredicateEditor in place of the old
one, with setRowTemplates:
I think you may also need to save off the predicate editor's object
value first, and then set it back on after calling setRowTemplates:.
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
