stream_mixin 1.0.4 stream_mixin: ^1.0.4 copied to clipboard
A simple mixin for adding a stream behaviour to any class object
import 'package:flutter/material.dart';
import 'package:stream_mixin/store_service.dart';
import 'package:stream_mixin/stream_mixin.dart';
// Example 1
class AppTagService with StreamMixin<String> {
AppTagService._();
static final AppTagService instance = AppTagService._();
}
class CurrentTag extends StatelessWidget {
@override
Widget build(BuildContext context) {
return StreamBuilder<String>(
builder: (context, snap) => Text(snap.data ?? 'No tag selected yet.'),
stream: AppTagService.instance.onChange, //⭐
);
}
}
someFunction() {
AppTagService.instance.update(element: 'COVID-19');
}
// Example 2
class TodoModel extends BasicModel {
String title;
bool completed;
TodoModel({
int id,
@required this.title,
this.completed: false,
}) {
this.id = id ?? DateTime.now().millisecondsSinceEpoch;
}
}
class TodoService extends StoreService<TodoModel> {
TodoService._();
static TodoService store = TodoService._();
List<TodoModel> get accending {
var todos = this.values;
todos.sort((a, b) => a.id - b.id);
return todos;
}
List<TodoModel> get completed {
return this.values.where((todo) => todo.completed).toList();
}
List<TodoModel> get pending {
return this.values.where((todo) => !todo.completed).toList();
}
void toggleStatus(TodoModel todo) {
todo.completed = !todo.completed;
TodoService.store.update(
element: AppStreamElement(item: todo, operation: Operation.Update),
);
}
}
class TodoListWidget extends StatelessWidget {
@override
Widget build(BuildContext context) {
return StreamBuilder(
builder: (context, snap) => ListView(
children: TodoService.store.accending.map(_buildListTile).toList(),
),
stream: TodoService.store.onChange,
);
}
ListTile _buildListTile(TodoModel todo) {
return ListTile(
leading: Text(todo.id.toString()),
title: Text(
todo.title,
style: TextStyle(
decoration:
todo.completed ? TextDecoration.lineThrough : TextDecoration.none,
),
),
trailing: Checkbox(
value: todo.completed,
onChanged: (bool _) {
TodoService.store.toggleStatus(todo);
},
),
);
}
}