title: Find out which items in a ListView are visible
body: <p>How can I find out which items are currently <code>visible</code> or <code>invisible</code> in a <code>ListView</code>?<br>
  For example, I have 100 items in <code>ListView</code> and when i scroll to top of screen or list, I want to detect which items appear or disappear from the viewport.</p>
  
  <p>Illustration:</p>
  
  <p><a href="https://i.stack.imgur.com/VDes4.png" rel="noreferrer"><img src="https://i.stack.imgur.com/VDes4.png" alt="enter image description here"></a></p>