How to store elements into a list while scrolling?

Support
1

How to store elements visible on screen into a list while scrolling

Scenario:
Scrolling through a list of songs in Playlist, I am able to store only elements visible on screen. Could you please help me on storing elements into a list while scrolling

2

Here’s some pseudocode to get you going. If you have duplicated songs you may need to check more than one element. It’s a clear use case for recursion:

main
  initialize list
  initialize finalList
  screen is presented
  list = getElements
  finalList = getAllElements(list)
end

getAllElements(list)
  initialize myList = list
  initialize iterateList
  scroll
  iterateList = getElements
  if iterateList.last == myList.last
    return myList
  else
    myList += iterateList
    iterateList.clear
    getAllElements(myList)
  end
end