firebase - flutter firestore pagination using streambuilder

Question

hello i am trying to use pagination in my list. and the list data is coming from firebase. i am not sure how to paginate data using stream builder. now i am doing the pagination by calling getdocuments in the didChangeDependencies() function. but after adding new data the list is not updated. if anyone can help then it will be great for me. here is what i am doing now..

 didChangeDependencies() {
    super.didChangeDependencies();

   getProducts();

    _scrollController.addListener(() {
      double maxScroll = _scrollController.position.maxScrollExtent;
      double currentScroll = _scrollController.position.pixels;
      double delta = MediaQuery.of(context).size.height * 0.20;
      if (maxScroll - currentScroll <= delta) {
        getProducts();
      }
    });
  }

  getProducts() async {
    if (!hasMore) {
      return;
    }
    if (isLoading) {
      return;
    }
    setState(() {
      isLoading = true;
    });
    QuerySnapshot querySnapshot;
    if (lastDocument == null) {
      querySnapshot = await firestore
          .collection('products')
          .limit(documentLimit)
          .orderBy('timestamp', descending: true)
          .getDocuments();
    } else {
      querySnapshot = await firestore
          .collection('products')
          .startAfterDocument(lastDocument)
          .limit(documentLimit)
          .orderBy('timestamp', descending: true)
          .getDocuments();
    }
    if (querySnapshot.documents.length < documentLimit) {
      hasMore = false;
    }
    if (querySnapshot.documents.isNotEmpty) {
      lastDocument =
          querySnapshot.documents[querySnapshot.documents.length - 1];
      products.addAll(querySnapshot.documents);
      setState(() {
        isLoading = false;
      });
    }
  }

Answer 1

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