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shouldSelectTabViewItem called twice

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shouldSelectTabViewItem called twice

Subject: shouldSelectTabViewItem called twice
From: Frode <email@hidden>
Date: Tue, 27 Jun 2006 11:10:01 +0200

Part 1 of 2

Hello!

I have a NSTableView inside a window. Two NSButtons have actions selectNextTabViewItem and selectPreviousTabViewItem to the NSTableView.

When I call selectXXXTabViewItem, or if it's called as a result of user interaction, the shouldSelectTabViewItem delegate is called twice, the other delegates (didSelectTabViewItem, willSelectTabViewItem) only once.

A similar strange behaviour appears if shouldSelectTabViewItem returns NO. Then selectXXXTabViewItem seems to send shouldSelectTabViewItem to all tabs before (or after) the selected tab. And the last tab receives two messages, again.

Does this behaviour fill any particular purpose? And what is the purpose?

Thanks for any hints

Regards
Roger

PS. A similar issue was posted about a year ago:

http://www.cocoabuilder.com/archive/message/cocoa/2005/11/27/151180

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