On 19 Jul 2008, at 23:18, Quincey Morris wrote:
On Jul 19, 2008, at 14:35, Paul Sargent wrote:
This works fine the first time the view is populated, but when it's
refreshed it just calls the second method with the pointers to the
dictionaries I return first time round. Trouble is they've been
autoreleased by now.
I think you mean "deallocated", not "autoreleased". The question is,
what's your evidence that they're deallocated? Is something crashing?
Just to be clear, I mean the object was de-allocated due to it being
an object created by a convenience method, and the auto release pool
it was in was released when control went back to the event loop.
Yes, when the OutlineView redraws for some reason (e.g. a mouse
click), it re-accesses the objects I returned last time (nothing wrong
with that). Trouble is, they are no longer valid, resulting in a crash
or a zombie log message if I have zombies enabled. I was just
surprised by the fact the OutlineView held pointers to objects it
didn't retain.
The main thing that's wrong here is that you're returning a
*different* object from outlineView:child:ofItem: each time. You
should return the same object if you are given the same parameters.
If finding extraInfo is not incredibly expensive, you could just
return aDataItem in the first method, and find extraInfo in the
second.
While you're right I would return different objects if I was called
twice, I'm not. As I understand it the Outline View will only ask for
objects when it knows the data has changed (e.g. after a reloadData or
reloadItem call) at which point it needs to expect a different object.
It's exactly the cost that took me down the road of bundling the info
up into a dictionary, so any other call backs didn't need to re-
evaluate things. Obviously I wasn't expecting anybody to guess that
from the code I posted.
_______________________________________________
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 [EMAIL PROTECTED]
