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comic_bloc.dart
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comic_bloc.dart
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import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:meta/meta.dart';
import 'package:bloc/bloc.dart';
import 'package:mikack/models.dart' as models;
import 'package:shared_preferences/shared_preferences.dart';
import 'package:tuple/tuple.dart';
import 'comic_event.dart';
import 'comic_state.dart';
import '../../store.dart';
import '../values.dart';
import '../ext.dart';
class ComicBloc extends Bloc<ComicEvent, ComicState> {
final models.Platform platform;
final models.Comic comic;
ComicBloc({@required this.platform, @required this.comic});
@override
ComicState get initialState => ComicLoadedState(
tabIndex: 0,
comic: comic,
isFavorite: false,
layoutColumns: defaultChaptersLayoutColumns,
isShowToolBar: false,
isShowFavoriteButton: true,
isShowAppBarTitle: false,
appBarColor: Colors.white,
);
@override
Stream<ComicState> mapEventToState(ComicEvent event) async* {
switch (event.runtimeType) {
case ComicRequestEvent: // 请求漫画信息
// 读取:是否收藏
var favorite = await getFavorite(address: comic.url);
var isFavorite = favorite != null;
if (favorite != null) // 更新最后阅读时间
await updateFavorite(favorite..lastReadTime = DateTime.now());
var reversed = favorite?.isReverseOrder;
var castedState = state as ComicLoadedState;
// 读取:是否反转排序
if (reversed == null) {
SharedPreferences prefs = await SharedPreferences.getInstance();
reversed = prefs.getBool(kChaptersReversed) ?? false;
}
// 读取:章节布局(列数)
var layoutColumns = favorite?.layoutColumns;
// 读取:已读历史记录
var readHistories = await findHistories(
forceDisplayed: false, homeUrl: castedState.comic.url);
var readHistoryAddresses = readHistories.map((h) => h.address).toList();
// 读取:上次阅读位置
var lastReadHistory = await getLastHistory(comic.url);
var lastReadChapterAddress = lastReadHistory?.address;
var lastReadAt = lastReadChapterAddress;
// 响应及时数据(来自本地)
yield castedState.copyWith(
isFavorite: isFavorite,
reversed: reversed,
readHistoryAddresses: readHistoryAddresses,
lastReadAt: lastReadAt,
layoutColumns: layoutColumns,
);
// 通过事件响应状态延迟数据(来自远程)
fetchComic().then((fetchedComic) {
add(ComicLoadedEvent(comic: fetchedComic));
}).catchError((_) {
add(ComicFetchErrorEvent());
});
break;
case ComicLoadedEvent: // 接收装载数据
var castedEvent = event as ComicLoadedEvent;
var chaptersCount = castedEvent.comic?.chapters?.length ?? 0;
yield (state as ComicLoadedState).copyWith(
comic: castedEvent.comic,
isShowToolBar: true,
layoutColumns:
chaptersCount < 3 && chaptersCount > 0 ? chaptersCount : null);
break;
case ComicRetryEvent: // 重试(重新请求远程数据)
yield (state as ComicLoadedState).copyWith(error: false);
fetchComic().then((fetchedComic) {
add(ComicLoadedEvent(comic: fetchedComic));
}).catchError((_) {
add(ComicFetchErrorEvent());
});
break;
case ComicFetchErrorEvent: // 加载错误
yield (state as ComicLoadedState).copyWith(error: true);
break;
case ComicTabChangedEvent: // 标签页切换
var castedEvent = event as ComicTabChangedEvent;
yield (state as ComicLoadedState).copyWith(tabIndex: castedEvent.index);
break;
case ComicReverseEvent: // 反转章节列表排序
var castedState = state as ComicLoadedState;
var favorite = await getFavorite(address: castedState.comic.url);
if (favorite != null) // 如果已收藏,持久化存储设置
await updateFavorite(
favorite..isReverseOrder = !castedState.reversed);
yield castedState.copyWith(reversed: !castedState.reversed);
break;
case ComicReadingMarkCleanRequestEvent: // 清空阅读标记
var castedState = state as ComicLoadedState;
await deleteHistories(homeUrl: castedState.comic.url);
add(ComicReadHistoriesUpdateEvent());
break;
case ComicFavoriteEvent: // 收藏/取消收藏
var castedEvent = event as ComicFavoriteEvent;
var source = await platform.toSavedSource();
var castedState = state as ComicLoadedState;
if (!castedEvent.isCancel) {
// 收藏
await insertFavorite(Favorite(
sourceId: source.id,
name: castedState.comic.title,
address: castedState.comic.url,
cover: castedState.comic.cover,
latestChaptersCount: castedState.comic.chapters?.length ?? 0,
lastReadTime: DateTime.now(),
));
} else {
// 取消收藏
await deleteFavorite(address: castedState.comic.url);
}
yield castedState.copyWith(isFavorite: !castedEvent.isCancel);
break;
case ComicReadHistoriesUpdateEvent: // 阅读历史更新
var castedState = state as ComicLoadedState;
// 读取:已读历史记录
var readHistories = await findHistories(
forceDisplayed: false, homeUrl: castedState.comic.url);
var readHistoryAddresses = readHistories.map((h) => h.address).toList();
// 读取:上次阅读位置
var lastReadHistory = await getLastHistory(comic.url);
var lastReadAt = lastReadHistory?.address ?? '#none#';
yield (state as ComicLoadedState).copyWith(
readHistoryAddresses: readHistoryAddresses, lastReadAt: lastReadAt);
break;
case ComicReadingMarkUpdateEvent: // 已读标记更新
var castedEvent = event as ComicReadingMarkUpdateEvent;
var castedState = state as ComicLoadedState;
switch (castedEvent.markType) {
case ComicReadingMarkType.readOne: // 标记已读
var source = await platform.toSavedSource();
var history = await getHistory(address: castedEvent.chapter.url);
if (history == null) {
await insertHistory(History(
sourceId: source.id,
title: castedEvent.chapter.title,
homeUrl: castedState.comic.url,
address: castedEvent.chapter.url,
cover: castedState.comic.cover,
displayed: false,
));
}
yield castedState.copyWith(readHistoryAddresses: [
castedEvent.chapter.url,
...castedState.readHistoryAddresses
]);
break;
case ComicReadingMarkType.readBefore: // 标记之前章节已读
var chapters = castedEvent.chapters;
var source = await platform.toSavedSource();
List<String> addresses = [];
List<History> histories = [];
// 一次性查询出所有已存在的历史记录
var extendedHistoryAddresses = (await findHistories(
forceDisplayed: false,
addressesIn: chapters.map((c) => c.url).toList()))
.map((h) => h.address)
.toList();
// 剔除已存在的历史
chapters
.removeWhere((c) => extendedHistoryAddresses.contains(c.url));
for (models.Chapter chapter in chapters) {
histories.add(History(
sourceId: source.id,
title: chapter.title,
homeUrl: castedState.comic.url,
address: chapter.url,
cover: castedState.comic.cover,
displayed: false,
));
addresses.add(chapter.url);
}
// 插入新的不显示历史(仅标记已读)
await insertHistories(histories);
yield castedState.copyWith(readHistoryAddresses: [
...addresses,
...castedState.readHistoryAddresses
]);
break;
case ComicReadingMarkType.unreadOne: // 标记未读
await deleteHistory(address: castedEvent.chapter.url);
// 更新上次阅读历史
add(ComicReadHistoriesUpdateEvent());
break;
}
break;
case ComicChapterColumnsChangedEvent: // 章节布局变化(列数)
var castedEvent = event as ComicChapterColumnsChangedEvent;
var castedState = state as ComicLoadedState;
var favorite = await getFavorite(address: castedState.comic.url);
if (favorite != null) // 如果已收藏,持久化存储设置
await updateFavorite(
favorite..layoutColumns = castedEvent.layoutColumns);
yield (state as ComicLoadedState)
.copyWith(layoutColumns: castedEvent.layoutColumns);
break;
case ComicVisibilityUpdateEvent:
var castedEvent = event as ComicVisibilityUpdateEvent;
yield (state as ComicLoadedState).copyWith(
isShowToolBar: castedEvent.showToolBar,
isShowFavoriteButton: castedEvent.showFavoriteButton,
isShowAppBarTitle: castedEvent.showAppBarTitle,
);
break;
case ComicAppBarBackgroundChangedEvent:
var castedEvent = event as ComicAppBarBackgroundChangedEvent;
yield (state as ComicLoadedState).copyWith(
appBarColor: castedEvent.color,
);
break;
}
}
Future<models.Comic> fetchComic() async {
var loadedComic =
await compute(_fetchChaptersTask, Tuple2(platform, comic));
// 更新已收藏的章节数量
var favorite = await getFavorite(address: loadedComic.url);
if (favorite != null) {
favorite.latestChaptersCount = loadedComic.chapters.length;
if (loadedComic.cover.isNotEmpty) favorite.cover = loadedComic.cover;
await updateFavorite(favorite);
}
return loadedComic;
}
@override
void onError(Object error, StackTrace stacktrace) {
print(stacktrace);
super.onError(error, stacktrace);
}
}
models.Comic _fetchChaptersTask(Tuple2<models.Platform, models.Comic> args) {
var platform = args.item1;
var comic = args.item2;
platform.fetchChapters(comic);
return comic;
}