On Aug 15, 2014, at 8:58 AM, Jonathan Taylor <jonathan.tay...@glasgow.ac.uk> wrote:
>>> After being impressed with bindings for an NSTableView, I’m looking at what >>> I can do for a standalone NSPopupButton, in the hope of reducing the amount >>> of glue code I have. The button isn’t just a simple one though, I need to: >>> - Include separator items >>> - Disable (grey out) some items >>> - Select multiple items (it’s configured as a pull-down menu) >>> >>> It’s not obvious to me that there’s a way of doing any of those things with >>> bindings (though the multiple-selected-items might work somehow through the >>> array controller). Can anyone advise on whether there is any hope for this >>> approach, or do I have to accept that this is more than the bindings are >>> intended to help with? >> >> Short answer, yes. With some hackery you could get separator items, but the >> multiple checked state will likely require as much work as your glue code. >> So I wold say the best approaches are a 50/50 between bindings and glue. >> That is, you could use bindings for content, but manually handle state, or >> use bindings for state, and manually handle content. Doing both is probably >> an exercise in futility. > > Thanks for confirming! Out of interest, could you describe the hackery you > have in mind for separators? It might still be helpful to bind the menu item > titles to an array. This thread gives a couple of approaches, depending on how you need the menu constructed: http://www.cocoabuilder.com/archive/cocoa/275031-nspopupbutton-bindings-separator-items.html > As for manually handing state (if I were to use bindings for content), would > the NSMenuDelegate method menu:updateItem:atIndex:shouldCancel: be the > appropriate place to determine which items are checked, enabled, etc? In my > all-manual version, I keep track of when the user checks/unchecks individual > items through an action on the NSMenuItem. I'm going to have to do something > else if the item list is bound to an array - any suggestions about the most > appropriate place to identify when the selection changes? As long as you can hook your delegate in on time, sure. I think that NSPopupButton keeps the same NSMenu instance throughout it's lifetime, but if not, the delegate approach won't work. Keary Suska Esoteritech, Inc. "Demystifying technology for your home or business" _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
