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Observing change of selection

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Observing change of selection

Subject: Observing change of selection
From: Bob Peterson <email@hidden>
Date: Wed, 26 Jan 2005 19:16:46 -0500

I have tried a couple ways to know when the selection has changed in my NSArrayController. Since view-to-controller bindings know when this happens, I'd like to know how I can write some custom code know when the selection changes.

What I want to do is change the number of ticks marks on an NSSlider based on the current selection. Each object in the array can have a different number of ticks. NSSlider doesn't make the numberOfTickMarks property bindable (according to Interface Builder and the bindings doc, so I need to write some code.

I've tried extending all of the NSArrayController and NSObjectController methods that change the selection. I've tried registering an observer for various selection keys using addObserver:forKeyPath:options:context:.

Y'all have never failed me yet, so thanks in advance.
\bob

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