Re: Best way to selectively show objects in a tree controller/outlineview
Re: Best way to selectively show objects in a tree controller/outlineview
- Subject: Re: Best way to selectively show objects in a tree controller/outlineview
- From: Joanna Carter <email@hidden>
- Date: Wed, 31 Mar 2010 09:19:23 +0100
Hi Tony
> Based on a user preference, I want to be able to selectively show/not show items contained in the tree controller by an outline view. For example, suppose the tree controller has these items: A,B,C,D,D,E,F,G,H. The outline view will normally display all of the items. Now suppose the user sets a preferences that he/she doesn't want to show item(s) 'D'. The outline view should now display: A,B,C,E,F,G,H.
>
> One obvious method(albeit brute force) is to rebuild the tree controller list and redisplay it. For what I want to do, this is way too expensive of an operation. In addition, the user can toggle back and forth the preference. There doesn't seem to be an obvious way to tell the outline controller, "skip or hide this item".
One obvious way is, not to work with the tree controller but, to work with the tree itself. If the data is retrieved from a Core Data store, you can mark each item with a "Valid" property and use a predicate on the fetch.
Joanna
--
Joanna Carter
Carter Consulting
_______________________________________________
Cocoa-dev mailing list (email@hidden)
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:
This email sent to email@hidden