[PATCH] NSOutlineView lazy loading of the outline item tree

[Quentin Mathé]

Hi,

Here is a new NSOutlineView patch that implements the lazy loading of  
the outline items. Until now NSOutlineView entered in an endless  
recursion on browsing a file system or a not-so-small object graph (by  
trying to create outline items for all the files for example). This  
patch modifies _loadDictionaryStartingWith: to only load expanded  
items. _openItem: has been updated to check whether the item needs to  
be loaded (or reloaded) before retrieving the children of the item and  
inserting them as cells. If the children haven't been loaded, - 
_loadDictionaryStartingWith: will be called for the given item which  
is getting expanded/open.
This patch is based on Cocoa behavior.
As a side note, I found this code a bit hard to read, for example  
having better names for variables rather than item, sitem, startitem  
could help. However I don't know which names could work better :-/

NSOutlineView.m.patch
Description: Binary data

Cheers,
Quentin.