created infinite scroll component
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87c14483c7
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import 'package:flutter/material.dart';
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import 'package:flutter_hooks/flutter_hooks.dart';
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class InfiniteScroll<T> extends HookWidget {
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final int batchSize;
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final Widget loadingWidget;
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final Widget Function(T data) builder;
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final Future<List<T>> Function(int page, int batchSize) fetchMore;
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InfiniteScroll({
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this.batchSize = 10,
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this.loadingWidget =
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const ListTile(title: Center(child: CircularProgressIndicator())),
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this.builder,
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this.fetchMore,
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}) : assert(builder != null),
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assert(fetchMore != null);
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@override
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Widget build(BuildContext context) {
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final page = useState(1);
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final hasMore = useState(true);
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final data = useState<List<T>>([]);
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return ListView.builder(
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// +1 for the loading widget
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itemCount: data.value.length + 1,
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itemBuilder: (_, i) {
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// reached the bottom, fetch more
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if (i == data.value.length) {
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// if there are no more, skip
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if (!hasMore.value) {
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return Container();
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}
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fetchMore(page.value, batchSize).then((value) {
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// if got less than the batchSize, mark the list as done
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if (value.length < batchSize) {
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hasMore.value = false;
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}
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// append new data and increment page count
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data.value.addAll(value);
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page.value++;
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});
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return loadingWidget;
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}
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// not last element, render list item
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return builder(data.value[i]);
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},
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);
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}
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}
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