NSTableView selection Delegate Methods being called twice?

[Robert Kukuchka]

Hello,
	I'm trying to handle some selection switching of an NSTableView, but  
I'm getting double the calls I "expect". Why is this, or have I done  
something wrong?
Cheers,
Rob
BT #1
#1  0x92a2400f in -[NSTableView  
_sendDelegateSelectionIndexesForProposedSelection:] ()
#2  0x927fe124 in -[NSTableView  
_userSelectRowIndexes:withNewSelectedRow:] ()
#3  0x927fe08c in -[NSTableView _userSelectSingleRow:] ()
#4  0x927fbc9c in -[NSTableView mouseDown:] ()
#5  0x927b388b in -[NSWindow sendEvent:] ()
#6  0x92780431 in -[NSApplication sendEvent:] ()
#7  0x926dde27 in -[NSApplication run] ()
#8  0x926ab030 in NSApplicationMain ()
#9  0x00002ce3 in main (argc=1, argv=0xbffff724) at /Users/ 
robertkukuchka/CodeDev/SoftBank MWL/main.m:25

I return the same index in this call..

BT #2
#1  0x92a2400f in -[NSTableView  
_sendDelegateSelectionIndexesForProposedSelection:] ()
#2  0x927fe408 in -[NSTableView  
_userSelectableRowIndexesForProposedSelection:] ()
#3  0x927fefd2 in -[NSTableView _userCanSelectSingleRow:] ()
#4  0x927fbeba in -[NSTableView mouseDown:] ()
#5  0x927b388b in -[NSWindow sendEvent:] ()
#6  0x92780431 in -[NSApplication sendEvent:] ()
#7  0x926dde27 in -[NSApplication run] ()
#8  0x926ab030 in NSApplicationMain ()
#9  0x00002ce3 in main (argc=1, argv=0xbffff724) at /Users/ 
robertkukuchka/CodeDev/SoftBank MWL/main.m:25

I'm not sure why I get the delegate call twice. I can see that  
(obviously) _userSelectableRowIndexesForProposedSelection and  
_userSelectRowIndexes:withNewSelectedRow must both call  
_sendDelegateSelectionIndexesForProposedSelection, but why is this  
happening twice. Does returning the old value cause the second call?

For context I'm trying to mimic the behaviour within Apple Mail's  
Preferences->Account dialog.
I want to prevent a user from switching items in an NSTableView  
(Accounts) unless they respond to a modal panel (Save, Don't Save,  
Cancel). I'm trying to use NSBeginAlertPanel + store the next and  
current selections (since NSBeingAlertPanel doesn't block) within a  
selection delegate method.

Am I doing this in a convoluted way?

Cheers,
Rob





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