WORKAROUND: Bound popup's current selection

• Subject: WORKAROUND: Bound popup's current selection
• From: Chuck Musser <email@hidden>
• Date: Sat, 31 Jul 2004 12:53:49 -0700
• User-agent: Mozilla Thunderbird 0.6 (Macintosh/20040502)

I have a popup's selectedIndex bound to an NSArrayController's selectionIndex property. This allows the popup to display a text field of the currently selected array element, but it has an interesting (and undesirable) side effect. When the underlying array is empty, the popup displays a large integer value: 2147483647. Once I add an element, the integer disappears and the popup works nicely.

Is this binding the proper way to do this? It's the closest I can get to the desired popup behavior: show a blank when the list is empty and show a label from the selected object when it's not.

I've tried a few other things, like setting the No Selection and Null Placeholder to "0". These changes had no effect. I also tried a different binding altogether: binding the popup's selectedValue to the NSArrayController's selection.label property. That binding results in odd behavior. I can add one element, but subsequent new elements don't show up in the popup. Even still, that approach was somewhat encouraging--with the No Selection Placeholder set to a single space, my popup started out blank, like I wanted.

Is the proper technique to use my original binding, but delay it until after the first element is added?

Chuck
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