stream_mixin 1.0.2

A simple mixin for adding a stream behaviour to any class object

example/main.dart

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);
        },
      ),
    );
  }
}