69 lines
2.2 KiB
Dart
69 lines
2.2 KiB
Dart
import 'dart:async';
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import 'package:imagini/core/imagini_application.dart';
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import 'package:imagini/api/imagini_api_repository.dart';
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import 'package:imagini/graphql/imagini_graphql.dart';
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import 'package:cached_network_image/cached_network_image.dart';
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class HomeBloc{
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final ImaginiApplication _application;
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ImaginiAPIRepository _imaginiAPI;
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final _loginController = StreamController<bool>.broadcast();
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Stream<bool> get loginResult => _loginController.stream;
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final _authenticatedController = StreamController<bool>.broadcast();
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Stream<bool> get authenticatedResult => _authenticatedController.stream;
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Map<int, List<MediaItems$Query$MediaItemResponse$MediaItem>> _pagedMediaItemListCache =
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Map<int, List<MediaItems$Query$MediaItemResponse$MediaItem>>();
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int totalMediaItems;
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int _pageSize = 50;
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HomeBloc(this._application){
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_init();
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}
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void _init(){
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_imaginiAPI = _application.imaginiAPI;
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}
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void dispose(){
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_loginController.close();
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_authenticatedController.close();
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}
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Future<CachedNetworkImage> getMedia(int index, derivedContentWidth) async {
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MediaItems$Query$MediaItemResponse$MediaItem mediaDetails = await getMediaDetails(index);
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if (mediaDetails == null)
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return null;
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int derivedContentHeight = (mediaDetails.height / mediaDetails.width * derivedContentWidth).ceil();
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return _imaginiAPI.getImage(mediaDetails.fileName, derivedContentWidth, derivedContentHeight);
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}
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Future<MediaItems$Query$MediaItemResponse$MediaItem> getMediaDetails(int index) async {
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int itemPage = (index / _pageSize).ceil();
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int indexOnPage = index % _pageSize;
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if (!_pagedMediaItemListCache.containsKey(itemPage))
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await _cachePage(itemPage);
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return _pagedMediaItemListCache[itemPage][indexOnPage];
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}
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_cachePage(int itemPage) async {
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MediaItems$Query newItems = await _imaginiAPI.mediaItems(Page(page: itemPage));
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totalMediaItems = newItems.mediaItems.page.total;
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_pagedMediaItemListCache[itemPage] = newItems.mediaItems.data;
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}
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checkAuthentication(){
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_authenticatedController.addStream(_imaginiAPI.isAuthenticated());
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}
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attemptHome(String username, password, server){
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_loginController.addStream(_imaginiAPI.login(username, password, server));
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}
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}
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