Detect ScrollView has reached the end

Question

I have a Text with long text inside a ScrollView and I want to detect when the user has scrolled to the end of the text so I can enable a button.

Answer 1

As people helped here I will add the simple code they write to make reached to top and reached to bottom event and I did a little illustration to make things simpler

{
if(isCloseToTop(nativeEvent)){
    //do something
}
if(isCloseToBottom(nativeEvent)){
   //do something
}
}}
>
...contents




isCloseToBottom({layoutMeasurement, contentOffset, contentSize}){
   return layoutMeasurement.height + contentOffset.y >= contentSize.height - 20;
}



ifCloseToTop({layoutMeasurement, contentOffset, contentSize}){
   return contentOffset.y == 0;
}