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NSTableView selection Delegate Methods being called twice?

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NSTableView selection Delegate Methods being called twice?

Subject: NSTableView selection Delegate Methods being called twice?
From: Robert Kukuchka <email@hidden>
Date: Wed, 10 Sep 2008 15:18:52 -0700

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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