Infinite Scroll Pagination In Flutter.

What is Pagination?

Pagination is the process of dividing data into sequential segments, allowing users to consume it at their desired pace. Imagine social media platforms like Instagram or Twitter – they continuously feed users with posts as they scroll through the app. The pages seem endless, thanks to the visual implementation of infinite scroll pagination.

Why Use Pagination?

1. Performance: Loading all data at once can impact your app’s performance. Pagination ensures a smoother experience by fetching data incrementally.
2. User Experience: Users can explore large datasets without feeling overwhelmed.
3. Efficiency: Only load what’s needed, conserving resources.

Core Code Example:

class PaginationScrollController {
  late ScrollController scrollController;
  bool isLoading = false;
  bool stopLoading = false;
  int currentPage = 1;
  double boundaryOffset = 0.6;
  late Function loadAction;

  void init({Function? initAction, required Function loadAction}) {
    if (initAction != null) {
      initAction();
    }
    this.loadAction = loadAction;
    scrollController = ScrollController()..addListener(scrollListener);
  }

  void dispose() {
    scrollController.removeListener(scrollListener);
    scrollController.dispose();
  }

  void scrollListener() {
    if (!stopLoading) {
      if (scrollController.offset >=
          scrollController.position.maxScrollExtent * boundaryOffset &&
          !isLoading) {
        isLoading = true;
        loadAction().then((shouldStop) {
          isLoading = false;
          currentPage++;
          boundaryOffset = 1 - 1 / (currentPage * 2);
          if (shouldStop == true) {
            stopLoading = true;
          }
        });
      }
    }
  }
}
        

Conclusion

By following these steps, you can create a seamless infinite scroll experience for your users using core Flutter components.

Happy coding!