title: How to determine whether scrollview (or listview) child is mostly in view in React Native
body: <p>I am currently using a ListView to display some data. Due to the design, the rows take up about 70% of the height of the screen which means there is always at least 2 rows visible, with a max of three. What I would like to determine is which row is mostly visible.</p>
  
  <p>I am currently using onChangeVisibleRows, but that just tells me which rows are visible or have entered or left the view.</p>
  
  <p>Any ideas?</p>