firebase - 如何向 FirebaseAnimatedList 添加分页

Question

我想使用 FirebaseAnimatedList 进行分页，但我不知道该怎么做。我将 ScrollController 设置为 Controller 属性，并且能够在滚动到顶部时收到通知，但我不知道之后如何获取其他数据。

有人知道如何分页吗？

代码:

int limit = 15;

 @override
  void initState() {
    this.roomId = widget.roomId;
    listScrollController = new ScrollController()..addListener(_listener);
    super.initState();
  }
     _listener() {
        if (listScrollController.position.pixels ==
                listScrollController.position.maxScrollExtent) {
          // fetch additional here
        }
      } 
    new Flexible(
            child: new FirebaseAnimatedList(
              controller: listScrollController,
              query: FirebaseDatabase.instance
                  .reference()
                  .child('chat')
                  .child(roomId)
                  .limitToLast(limit),
              padding: const EdgeInsets.all(8.0),
              reverse: true,
              sort: (a, b) => b.key.compareTo(a.key),
              //comparing timestamp of messages to check which one would appear first
              itemBuilder: (BuildContext context, DataSnapshot messageSnapshot,
                  Animation<double> animation, int index) {
                return new ChatMessageListItem(
                  messageSnapshot: messageSnapshot,
                  animation: animation,
                );
              },
            ),
          ),

Answer 1

遗憾的是，FirebaseAnimatedList 尚不支持分页。您需要为此和用户编写自己的分页登录 AnimatedList 以显示子项。