On 19/04/2011, at 18:19, Quincey Morris wrote: > On Apr 19, 2011, at 00:41, Ben Golding wrote: > >> I am a bit stumped. I have an array controller which I have hooked up to a >> pop-up button and that works quite well. The members of the array are >> NSStrings but I would like to reformat them when they're displayed by the >> pop-up button. Seems fairly straightforward, I thought I'd just write a >> little transformer to do that. >> >> I plugged everything together and was surprised that that the transformer >> was raising an exception because it was being passed an >> NSObjectControllerProxy as its argument, not an NSString as I'd been >> expecting. > > Can you list explicitly all the NSPopUpButton bindings you're using?
Sure, I'm using content to bind to an array controller bound to an array of pop-up button titles and selected index (though I'm picking up the selected object using [[arrayControlled selectedObjects] objectAtIndex:0]). I've also tried binding to contentValues which was unsuccessful too. > The bindings for popup buttons are very nasty. You have to figure out > what/whether to bind 'content', 'contentObjects' and 'contentValues'. Only > after you've got that right can you decide which of the 'selected...' > bindings you want to use. > > 'content', 'contentObjects' and 'contentValues' correspond to controller > proxies, strings and represented objects, but I couldn't tell you off-hand > which corresponds to what. It's anybody's guess whether the documentation > (http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/CocoaBindingsRef/BindingsText/NSPopUpButton.html) > is actually correct -- several of the pages in that document are wrong > and/or incomplete -- and it's a puzzle sometimes to understand what the > documentation even means. What I'd found was that the documentation doesn't indicate what the ValueTransformer indicated is passed. It seems to be a controller object, not the pop-up button item's title which is the only thing that seems to make sense in the context. > TBH, I've generally found it easier *not* to use bindings for NSPopUpButton > content, but provide it the traditional way ('-[NSPopUpButton > insertItem...]'), and just use a binding for 'selectedIndex'. But maybe I'm > just a coward. I share your fear but the win with bindings is too good to avoid. I try to think of these sort of frustrations as part of the learning process. I can really sympathise with wanting to fall back to the "old way". Ben.
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