How to check if scroll position is at top or bottom in ListView?

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There are generally two ways of doing it.

1. Using ScrollController

// Create a variable
final _controller = ScrollController();
  
@override
void initState() {
  super.initState();
  
  // Setup the listener.
  _controller.addListener(() {
    if (_controller.position.atEdge) {
      bool isTop = _controller.position.pixels == 0;
      if (isTop) {
        print('At the top');
      } else {
        print('At the bottom');
      }
    }
  });
}

Usage:

ListView(controller: _controller) // Assign the controller.

2. Using NotificationListener

NotificationListener<ScrollEndNotification>(
  onNotification: (scrollEnd) {
    final metrics = scrollEnd.metrics;
    if (metrics.atEdge) {
      bool isTop = metrics.pixels == 0;
      if (isTop) {
        print('At the top');
      } else {
        print('At the bottom');
      }
    }
    return true;
  },
  child: ListView.builder(
    physics: ClampingScrollPhysics(),
    itemBuilder: (_, i) => ListTile(title: Text('Item $i')),
    itemCount: 20,
  ),
)

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