Graham, I'm not sure that my solution is any "less messy" than what you have suggested, but... when faced with this same situation, I gave the save panel a different title each time it was invoked. When the panel object was passed to my delegate, I could tell where the panel was being used by the title of the inbound object. No need for subclasses or additional retains.
later, douglas On Sep 20, 2011, at 6:15 PM, Graham Cox wrote: > In my app I have two places where a NSSavePanel is used to set up different > sorts of file save. Using the modern 'block completion' approach, running the > panels as sheets, the code is very nice, self-contained and clean. The save > panel variable is a local var in the method that kicks off the panel, and > because this internally defines the completion block, that's all that's > needed on the face of it. > > Problem is, both these uses set the same delegate for the save panel, in > order to restrict the panels to certain directories. In the delegate > callback, there is no easy way that I can see to tell apart one save panel > from another (I'm passed the panel itself, but I can't tell which one it is). > > I could of course assign the save panels to an ivar of the delegate so that > it can perform a comparison, but that strikes me as pretty messy, given that > otherwise the panels are very neatly encapsulated along with their completion > blocks. In addition, the delegate class is already complex and broken up into > multiple categories for ease of managing the code, and this code lives in a > category. Adding an ivar would need to be done in the main class interface > file and when you do that to support functionality in a category, you get a > warning from the analyser that the ivar is 'unused'. > > What would be a clean way to easily distinguish the save panels without > having to use ivars? > > --Graham _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
