我使用Riverpod作为一个初学者,我想在我的页面实现分页。
当我向下滚动时,我正在执行一个新的API调用来获取下一个项目,但同时,我又回到了内容的顶部。项目加载良好,因此我需要再次滚动以查看新项目。
已删除以下是我的页面代码:
import 'package:auto_route/annotations.dart';
import 'package:des_cartes/src/core/logger/log_service.dart';
import 'package:des_cartes/src/features/boardgames/presentation/manager/boardgames.provider.dart';
import 'package:des_cartes/src/features/boardgames/presentation/widgets/boardgame_tile.widget.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
@RoutePage(name: 'BoardgamesPage')
class BoardgamesPage extends ConsumerStatefulWidget {
const BoardgamesPage({super.key});
@override
ConsumerState createState() => _BoardgamesPageState();
}
class _BoardgamesPageState extends ConsumerState<BoardgamesPage> {
late ScrollController scrollController;
late GlobalKey scrollKey;
@override
void initState() {
super.initState();
scrollController = ScrollController();
scrollKey = GlobalKey();
scrollController.addListener(() {
if (scrollController.position.atEdge) {
if (scrollController.position.pixels != 0) {
ref.read(pageProvider.notifier).update((state) => state = state + 1);
}
}
});
}
@override
Widget build(BuildContext context) {
final boardgames = ref.watch(boardgamesListNotifierProvider);
return Scaffold(
appBar: AppBar(
title: Center(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Image.asset(
"assets/logo_title_cropped.png",
height: 45,
),
)),
backgroundColor: const Color.fromRGBO(171, 237, 216, 1.0),
),
body: SafeArea(
child: Column(
children: [
TextField(
decoration: const InputDecoration(
border: OutlineInputBorder(),
labelText: 'Search',
),
onChanged: (value) {
ref
.read(searchGameProvider.notifier)
.update((state) => state = value);
},
),
Expanded(
child: SingleChildScrollView(
key: scrollKey,
controller: scrollController,
child: Column(
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: Container(
child: boardgames.when(
data: (boardgames) => Center(
child: Wrap(
spacing: 10,
runSpacing: 10,
children: boardgames
.map((boardgame) =>
BoardgameTile(boardgame: boardgame))
.toList()),
),
error: (err, _) => Text("error: $err"),
loading: () => const CircularProgressIndicator()),
),
)
],
),
),
),
],
)),
);
}
}
字符串
以下是我的供应商:
import 'package:des_cartes/src/core/logger/log_service.dart';
import 'package:des_cartes/src/features/boardgames/data/data_sources/boardgames.datasource.dart';
import 'package:des_cartes/src/features/boardgames/data/repositories/boardgames.repository.dart';
import 'package:des_cartes/src/features/boardgames/domain/entities/boardgame.dart';
import 'package:des_cartes/src/features/boardgames/domain/entities/boardgame.sort_filter_config.dart';
import 'package:des_cartes/src/features/boardgames/domain/repositories/boardgames.repository.dart';
import 'package:des_cartes/src/features/boardgames/domain/use_cases/get_boardgames.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
part 'boardgames.provider.g.dart';
@riverpod
BoardgamesDatasource boardgameDatasource(BoardgameDatasourceRef ref) =>
BoardgamesDatasource();
@riverpod
BoardgamesRepository boardgamesRepository(BoardgamesRepositoryRef ref) =>
BoardgamesRepositoryImpl(
datasource: ref.watch(boardgameDatasourceProvider));
@riverpod
class BoardgamesListNotifier extends _$BoardgamesListNotifier {
@override
Future<List<Boardgame>> build() async {
return fetchBoardgames();
}
Future<List<Boardgame>> fetchBoardgames() async {
final searchGame = ref.watch(searchGameProvider);
final page = ref.watch(pageProvider);
final config = BoardgameSortFilterConfig(
filter: searchGame,
limit: 10,
page: page,
type: BoardgameType.boardgameexpansion);
final boardgamesRepository = ref.read(boardgamesRepositoryProvider);
final boardgames = await GetBoardgames(boardgamesRepository)(config);
return boardgames.fold((failure) => [], (boardgames) {
return [...?state.value, ...boardgames];
});
}
}
final searchGameProvider = StateProvider<String>((ref) => '');
final pageProvider = StateProvider<int>((ref) => 1);
型
我想停留在我的页面底部,以查看加载的新项目!我想我没有使用正确的东西,请让我知道!
感谢@Ruble更新
这是更好!我有一个奇怪的行为,这里是一个视频链接:https://drive.google.com/file/d/1am7t4Cu9Tz8J23sggx7fKL3sBFRO7hvF/view?usp=sharing
- 当我慢慢滑动,而让手指在屏幕上,我可以看到新的项目,但它 Flink (视频的第一部分)
- 当我用力滑动时,我可以看到我的滚动视图滚动到顶部(视频的第二部分
1条答案
按热度按时间gpnt7bae1#
尝试创建一个新列表,而不是扩展现有列表:
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此外,您不应该在
build
方法中创建控制器,全局键或附加侦听器。build
被多次调用,每次都会附加一个侦听器,旧的控制器将无法正确处理。相反,使用ConsumerStatefulWidget
并在initState
中正确初始化数据(并附加侦听器)。