Re: Trying to bind to NSTreeController
Re: Trying to bind to NSTreeController
- Subject: Re: Trying to bind to NSTreeController
- From: Scott Anguish <email@hidden>
- Date: Wed, 13 Jul 2005 02:39:12 -0400
NSTreeController's arrangedObjects is opaque.
From the updated reference doc that'll be out shortly.
Returns an object containing the receiver’s sorted content objects.
This is an opaque root node representing all the currently displayed
objects. This method should be used for binding, no assumption should
be made about what methods this object supports.
On Jul 13, 2005, at 12:41 AM, Todd Blanchard wrote:
I'm trying to create a custom binding to an
NSTreeController.arrangedObjects.someKey.
When registering for KVO on arrangedObjects.someKey I'm finding
that I'm only getting observations of type NSValueChanged (never
NSValueInserted or the other notification types) and the thing that
changed is some private TreeNodeProxy class or a private
NSTreeControllerProxy class. How is an individual supposed to
handle notifications of changes in private proxy objects that don't
forward valueForKeyPath: requests properly? Seems like that
TreeNode class needs to be made public.
Is there an example of binding an indexed property to a tree
controller's arrangedObjects.someKey anywhere?
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context
{
int changeType = [[change objectForKey: NSKeyValueChangeKindKey]
intValue];
if(changeType == NSKeyValueChangeSetting) // this is the only
one that gets sent!
{
...
}
else if(changeType == NSKeyValueChangeInsertion)
{
//never gets here
}
else if(changeType == NSKeyValueChangeRemoval)
{
//never gets here
}
else if(changeType == NSKeyValueChangeReplacement)
{
//never gets here
}
}
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