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persistentObjectForItem in NSOutlineView

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persistentObjectForItem in NSOutlineView

Subject: persistentObjectForItem in NSOutlineView
From: Timothy Larkin <email@hidden>
Date: Sun, 12 Sep 2004 21:10:51 -0400

To make the expansion state of an outline persistent, we need to implement outlineview: persistentObjectForItem:item and outlineview:itemForPersistentObject:object. Having done this, I note that the first method is called whenever an item is expanded, and persistent object descriptors are stored in the preferences plist for each expanded item.

autosaveName is defined, and  autosaveExpandedItems is set to YES.

As far as i can make out from the documentation, these are the only requirements for expansion restoration to work.

However, when the outline is recreated the next time the application is run, not only does the expansion state fail to be reproduced, outlineview:itemForPersistentObject:object is not even called.

Is there some subtle point here I'm missing?

Tim Larkin
Abstract Tools

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