list_view_extension.dart

extension ListViewExtension on ListView {
  // It will notify to each paging load
  // You should control the state for your widget
  Widget onLazyLoads(Future<void> Function() onPagingLoad, {Widget? itemLoadWidget}) {
    if (childrenDelegate is SliverChildListDelegate) throw Exception('You should use list view builder ');
    final delegate = childrenDelegate as SliverChildBuilderDelegate;
    final itemCount = delegate.childCount ?? 0;
    return NotificationListener<ScrollNotification>(
      onNotification: (ScrollNotification notification) {
        if (notification.metrics.pixels == notification.metrics.maxScrollExtent) {
          onPagingLoad();
        }
        return true;
      },
      child: ListView.builder(
        itemCount: itemCount,
        itemBuilder: (context, index) {
          final childBuilder = delegate.builder(context, index) ?? const SizedBox.shrink();
          if (index == itemCount - 1) {
            return Column(
              children: [childBuilder, itemLoadWidget ?? const Center(child: CircularProgressIndicator())],
            );
          }
          return childBuilder;
        },
      ),
    );
  }
}