Re: Propagating change in object graph
Re: Propagating change in object graph
- Subject: Re: Propagating change in object graph
- From: Shawn Erickson <email@hidden>
- Date: Thu, 06 Sep 2007 07:13:16 -0700
On Sep 6, 2007, at 1:00 AM, Raphael Sebbe wrote:
Hi the list,
I have a quite generic question about how to propagate changes in a
Cocoa
app. I have used some different paradigms for this, each with
different
pros/cons. I would be interested in getting some thoughts about
this, what
are your established way of doing it...
Think of it as a view that needs to redisplay itself when
properties of an
object deep in the graph change.
1. Use NSNotificationCenter, pass the object, etc. (cons:
notification is
sent to all observer, across documents...)
2. Use KVO (seems complicated when a deep object is part of a to N
relation)
3. Send message up in the graph : point -> curve -> drawing ->
document,
(requires back pointers + specific methods)
Thanks for sharing,
You can create your own notifications centers if you want to scope
who is observing what.
-Shawn
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