For perpetuity, to do what I wanted I needed to bind selectedIndex to the
controller's "selectionIndex". I was avoiding this because it requires me to
have an outlet to the controller for conditionally enabling/disabling popup
items. Oh well.
Best,
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
------ Forwarded Message
> From: Keary Suska <[EMAIL PROTECTED]>
> Date: Sat, 28 Jun 2008 11:15:46 -0600
> To: Ken Thomases <[EMAIL PROTECTED]>
> Conversation: NSPopupButton Bindings-Related Issue
> Subject: Re: NSPopupButton Bindings-Related Issue
>
> 6/28/08 12:30 AM, also sprach [EMAIL PROTECTED]:
>
>> On Jun 27, 2008, at 11:01 PM, Keary Suska wrote:
>>
>>> Generally, my needs are simple. In this case, I need a sheet that displays
>>> an nspopupbutton populated with product names, where a user can select an
>>> item from the popup and a description of the item would appear in a
>>> designated space below the control, and of course I want to retrieve the
>>> value after the sheet is dismissed, providing that the correct button is
>>> pressed. Sounds easy, right?
>>>
>>> So, I have an NSPanel with an NSPopupButton, NSTextField, and two buttons
>>> ("Cancel" and "Use"). The NSPopupButton "content" is bound to
>>> "ProductController", which is a special NSArrayController subclass whose
>>> content is an array objects I am interested in, with key "arrangedObjects"
>>> no key path. "Content values" is bound to same with key path "name".
>>> "Selected value" is bound to same but with controller key "selection" and
>>> key path "name". NSTextField "value" is bound to ProductController
>>> "selection" key path "descrip".
>>
>> The last two bindings are incorrect, I think. Bind the pop-up's Selected
>> Object to a property of your model, not the array controller's selection.
>> That is, when the pop-up has an item selected, it will stuff that object
>> (the
>> "product") into that property of your model.
>
> The "selected" binding very well may be wrong. I didn't give the history
> there. If I don't bind anything there, the controller won't maintain a
> selection--i.e. the controller selection never changes. I tried various
> bindings, but I also have the issue of needing a sensible representedObject.
>
> Anyway, one key, or issue, is that none of this setup is part of a
> relationship, which your description above would apply to. I.e., there is no
> separate model object that wants the selected object. There is only a
> controller that wants it, but only if the user doesn't cancel the dialog.
>
> It could be that an NSArrayController can only function in a relationship, but
> I was hoping that wasn't necessary. All I want is a simple MVC: my model, an
> array of objects; my view, an NSPopUpButton (and NSTextField on the side); my
> contoller, a simple NSArrayController. BTW, I lied about it being a
> subclass--it's just a vanilla NSArrayController.
>
> I just want the array controller to do its job--maintain a selection that I
> can get later.
>
>> Then, binding your text field's Value to that same model property, except
>> adding on ".descrip" to the key path.
>
> No, this would be incorrect. View should always bind to a controller, and I
> shouldn't need an additional one. My binding is a typical type used in a
> master-detail interface.
>
>> This sort of arrangement is illustrated in the "Real-World Example" in
>> the Cocoa Bindings Programming Topics:
>>
<http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaBindings/Conc>>
e
>> pts/WhatAreBindings.html#//apple_ref/doc/uid/20002372-181136
>
> This shows the binding that I am currently sing, BTW. Anyway, I should
> probably start googling for implementing a maser-detail interface using
> NSPopupButton, which seems to involve some sort of trickery.
>
> Thanks for the assist,
>
> Keary Suska
> Esoteritech, Inc.
> "Demystifying technology for your home or business"
------ End of Forwarded Message
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