I'm building a Preferences window that has a toolbar, in the style of
Mail. I need to know if the user clicks on a toolbar item to change
the pane. If the current pane has pending changes, I display a sheet
asking for action regarding the present changes. I need to do this
BEFORE the selected toolbar item is changed. Which means I need to
intercept that change. Alas, I haven't been able to zero in on how to
do that. I don't see NSToolBar delegate methods that provide such
intercept (e.g. -(BOOL)shouldChangeToolbarItem.... or something of the
like), nor do I see anything useful that I could override if I
subclass the Toolbar instance. So, I must be overlooking something. If
anyone can tell me what, I'd be eternally grateful :-) TIA.
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