110 lines
2.9 KiB
Dart
110 lines
2.9 KiB
Dart
import 'package:get/get.dart';
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import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
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import 'package:solian/models/pagination.dart';
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import 'package:solian/models/post.dart';
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import '../providers/content/posts.dart';
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class PostListController {
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/// The polling source modifier.
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/// - `0`: default recommendations
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/// - `1`: shuffle mode
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RxInt mode = 0.obs;
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/// The paging controller for infinite loading.
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/// Only available when mode is `0`.
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PagingController<int, Post> pagingController =
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PagingController(firstPageKey: 0);
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PostListController() {
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_initPagingController();
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}
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/// Initialize a compatibility layer to paging controller
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void _initPagingController() {
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pagingController.addPageRequestListener(_onPagingControllerRequest);
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}
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Future<void> _onPagingControllerRequest(int pageKey) async {
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try {
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final result = await loadMore();
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if (result != null && hasMore.value) {
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pagingController.appendPage(result, nextPageKey.value);
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} else if (result != null) {
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pagingController.appendLastPage(result);
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}
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} catch (e) {
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pagingController.error = e;
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}
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}
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void _resetPagingController() {
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pagingController.removePageRequestListener(_onPagingControllerRequest);
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pagingController.nextPageKey = nextPageKey.value;
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pagingController.itemList?.clear();
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}
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RxBool isBusy = false.obs;
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RxList<Post> postList = RxList.empty(growable: true);
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RxInt nextPageKey = 0.obs;
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RxBool hasMore = true.obs;
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Future<void> reloadAllOver() async {
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nextPageKey.value = 0;
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hasMore.value = true;
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_resetPagingController();
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final result = await loadMore();
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if (result != null && hasMore.value) {
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pagingController.appendPage(result, nextPageKey.value);
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} else if (result != null) {
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pagingController.appendLastPage(result);
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}
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_initPagingController();
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}
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Future<List<Post>?> loadMore() async {
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final result = await _loadPosts(nextPageKey.value);
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if (result != null && result.length >= 10) {
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nextPageKey.value = nextPageKey.value + result.length;
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hasMore.value = true;
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} else if (result != null) {
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nextPageKey.value = nextPageKey.value + result.length;
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hasMore.value = false;
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}
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return result;
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}
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Future<List<Post>?> _loadPosts(int pageKey) async {
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isBusy.value = true;
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final PostProvider provider = Get.find();
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Response resp;
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try {
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resp = await provider.listRecommendations(
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pageKey,
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channel: mode.value == 0 ? null : 'shuffle',
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);
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} catch (e) {
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rethrow;
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} finally {
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isBusy.value = false;
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}
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final PaginationResult result = PaginationResult.fromJson(resp.body);
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final out = result.data?.map((e) => Post.fromJson(e)).toList();
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if (out != null) postList.addAll(out.cast<Post>());
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return out;
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}
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void dispose() {
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pagingController.dispose();
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}
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}
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