I notice that the current HIG recommends the use of a file format
popup in the Save dialog, when an application supports multiple formats:
http://developer.apple.com/documentation/UserExperience/Conceptual/AppleHIGuidelines/XHIGMenus/XHIGMenus.html#/
/apple_ref/doc/uid/TP30000356-TPXREF105
and the picture of the Save dialog seems to suggest that the popup is
to be implemented in an accessory view:
http://developer.apple.com/documentation/UserExperience/Conceptual/AppleHIGuidelines/XHIGWindows/XHIGWindows.html#/
/apple_ref/doc/uid/20000961-SW47
It seems to me that *each* of the formats in the popup is going to
have its *own* list of valid file extensions, so that changing the
selected item in the popup should make a corresponding change to
NSSavePanel's allowedFileTypes.
I can sort of see my way to doing that by subclassing a
NSViewController that owns the accessory view, and making the view
controller responsible for calling allowedFileTypes when the popup
selection changes, but I'm wondering if I'm overlooking a more direct
solution.
I'm also wondering if changing allowedFileTypes while the Save dialog
is displayed will actually work. (Will it replace the extension of
whatever is currently in the file name text field?)
Comments, anyone?
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