title: Callbacks When an NSScrollView is Scrolled?
body: <p>I'm making a Mac app which needs to know when the user is scrolling the <code>NSScrollView</code>, however, I can't find any methods like <code>UIScrollView</code>, which has the following delegate methods:</p>
  
  <pre><code>– scrollViewDidScroll:
  – scrollViewWillBeginDragging:
  – scrollViewDidEndDragging:willDecelerate:
  – scrollViewShouldScrollToTop:
  – scrollViewDidScrollToTop:
  – scrollViewWillBeginDecelerating:
  – scrollViewDidEndDecelerating:
  </code></pre>
  
  <p>Can I have the similar delegate methods for the App Kit? Thanks in advance.</p>
  
  <p>Kai.</p>