Re: CoreData updating of NSTableView cells
Re: CoreData updating of NSTableView cells
- Subject: Re: CoreData updating of NSTableView cells
- From: Keith Wilson <email@hidden>
- Date: Thu, 2 Mar 2006 21:35:31 +1100
I once had a similar problem with CoreData so in my
DocumentController I have implemented
-(void)didUndoChange:(NSNotification*)notification
{
[self refreshAllViews]; //which invokes a refresh of every view in
every document (as appropriate)
}
I do not know if this forced refresh is still necessary but I am now
reluctant to remove it - it works.
Keith from DownUnder
On 02/03/2006, at 9:12 PM, Jason Swain wrote:
I have a CoreData application that shows a table view of core data
objects. The table view has a custom cell for rendering the objects.
My (partial) core data model looks like this:
root --> group
where the relationship is one to many. I have bound a
NSArrayController with a contentSet binding specifying root.groups
as the model key path.
I set the data cell to a custom NSCell subclass. This cell uses the
name attribute as well as calculating a count of the items in the
group and displaying that number.
The problem occurs when I rename a group. I double click on a group
to edit it, change the name and the display updates correctly. Now
if I undo that change the group cell is not updated. The name has
changed in the data model, as soon as I force the cell to repaint
by changing the selection in the table view the correct (undone)
name is painted. I need this repaint to happen as part of the undo.
I know this must be a common operation, so what is the correct way
to handle it? It seems like I need to observe the name value for
each cell, but I cannot do that in the NSCell subclass as this
object is reused for multiple rows. It's possible to add an
observer in the NSArrayController, but will be hard to keep up to
date as groups are added and deleted, and this seems like a bit of
a kludge.
Anyone know what to do here?
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