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list_filter_app.dart
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list_filter_app.dart
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import 'package:example/src/common/error_message.dart';
import 'package:example/src/common/loading_indicator.dart';
import 'package:example/src/post/model/post.dart';
import 'package:example/src/post/model/post_repository.dart';
import 'package:example/src/post/ui/posts_list.dart';
import 'package:example/src/post/ui/posts_list_empty.dart';
import 'package:example/src/user/model/user.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_bloc_patterns/filter_list.dart';
import 'package:flutter_bloc_patterns/view.dart';
void main() => runApp(FilterListSampleApp());
const _myUserId = '3';
typedef PostsBloc = FilterListBloc<Post, User>;
class FilterListSampleApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Filter List Sample App',
theme: ThemeData(
primarySwatch: Colors.green,
),
home: BlocProvider(
create: (_) => PostsBloc(
FilterPostRepository(),
)..loadItems(),
child: const _PostsPage(),
),
);
}
}
enum _Posts { all, mine }
class _PostsPage extends StatelessWidget {
const _PostsPage();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('Posts')),
body: const PostsViewStateBuilder(),
bottomNavigationBar: const PostsBottomNavigationBar(),
);
}
}
class PostsViewStateBuilder extends StatelessWidget {
const PostsViewStateBuilder({super.key});
@override
Widget build(BuildContext context) {
return ViewStateBuilder<List<Post>, PostsBloc>(
loading: (context) => const LoadingIndicator(),
data: (context, posts) => PostsList(
posts,
onRefresh: () => _refreshPosts(context),
),
refreshing: (context, posts) => PostsList(
posts,
onRefresh: () => _refreshPosts(context),
),
empty: (context) => const PostsListEmpty(),
error: (context, error) => ErrorMessage(error: error),
);
}
void _refreshPosts(BuildContext context) {
final postsBloc = context.read<PostsBloc>();
postsBloc.refreshItems(filter: postsBloc.filter);
}
}
class PostsBottomNavigationBar extends StatefulWidget {
const PostsBottomNavigationBar({super.key});
@override
State<PostsBottomNavigationBar> createState() =>
_PostsBottomNavigationBarState();
}
class _PostsBottomNavigationBarState extends State<PostsBottomNavigationBar> {
_Posts selectedPosts = _Posts.all;
@override
Widget build(BuildContext context) {
return BottomNavigationBar(
currentIndex: selectedPosts.index,
items: const [
BottomNavigationBarItem(
icon: Icon(Icons.description),
label: 'All',
),
BottomNavigationBarItem(
icon: Icon(Icons.account_circle),
label: 'Mine',
),
],
onTap: _updateSelectedPosts,
);
}
void _updateSelectedPosts(int index) {
final user = index == _Posts.mine.index ? const User(_myUserId) : null;
final postsBloc = context.read<PostsBloc>();
if (user != postsBloc.filter) {
postsBloc.loadItems(filter: user);
setState(() {
selectedPosts = _Posts.values[index];
});
}
}
}