As he stated, -remove: does work, but its result is deferred.

On 15 May 2010, at 03:56, Tony Romano wrote:

> Thanks Quincey.
> 
> removeObjectAtArrangedObjectIndexPath works but remove: still does not.  It 
> should remove the object, if there is a bug then I will file a bug report.  
> anyone have ideas as to why remove: may not be working.  I hate to find 
> another way and drop a possible issue/bug.  Thanks.
> 
> -Tony
> 
> 
> On May 14, 2010, at 4:55 PM, Quincey Morris wrote:
> 
>> On May 14, 2010, at 15:39, Tony Romano wrote:
>> 
>>> I have a NSOutlineView bound to a NSTreeController in class mode(i.e. each 
>>> NSTreeNode represents my Node object).  Everything up to now is working 
>>> fine.  I am trying to remove a single node in the outline view by calling 
>>> [outlineView remove:self] as a test.  The documents are pretty simple and 
>>> they state that the remove: method removes the selected item, simple 
>>> enough.  I've put some test code around the remove.  The test code is 
>>> looking at the selected node Before the remove then looking at the selected 
>>> node again(assuming the controller picked a new selection).  The before and 
>>> after are the same which is also reflected in the UI.  I verified this in 
>>> the debugger.  Here's the snippet.
>>> 
>>>     ...
>>>     NSArray * selectedObjects = [outlineController selectedObjects];
>>> 
>>>     // Only selecting one node for the test, it should be at index 0.
>>>     Node * node = [selectedObjects objectAtIndex:0];
>>>     NSIndexPath * paths = [outlineController selectionIndexPath];
>>> 
>>>     [outlineController remove:self];
>>>     selectedObjects = [outlineController selectedObjects];
>>> 
>>>     node = [selectedObjects objectAtIndex:0];
>>> 
>>>     paths = [outlineController selectionIndexPath];
>>> 
>>> 
>>> The canRemove binding which is hooked up to the menu item, is working(Menu 
>>> Item is enabled).  Is there some setting I am completely overlooking. 
>>> Searching has come up empty handed.
>> 
>> You read the documentation for 'remove:' but apparently not all of it:
>> 
>>> Special Considerations
>>> Beginning with Mac OS X v10.4 the result of this method is deferred until 
>>> the next iteration of the runloop so that the error presentation mechanism 
>>> can provide feedback as a sheet.
>> 
>> So of course it hasn't been done when you check immediately after invoking 
>> the 'remove:' action. If you want it to happen immediately, you would need 
>> to use 'removeObjectAtArrangedObjectIndexPath:' instead.
>> 
>> But ...
>> 
>> Depending on where this code is, it may be a lousy idea to do the removal 
>> via the tree controller anyway. You're always better off changing the data 
>> model directly (the thing that is providing the tree controller with 
>> content).
>> 
>> If I say this often enough, one day someone might listen.
>> 
>> 
>> 
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> 
> -Tony
> 
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