main.dart

import 'package:flutter/material.dart' hide Action;
import 'package:mwwm/mwwm.dart';
import 'package:relation/relation.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(body: MyHomePage()),
    );
  }
}

class MyHomePageWm extends WidgetModel {
  MyHomePageWm() : super(WidgetModelDependencies());

  final myEntity =
      EntityStreamedState<String>(EntityState.content('Initial content'));

  final content = Action<void>();
  final loading = Action<void>();
  final loadingWithoutData = Action<void>();
  final error = Action<void>();

  @override
  void onBind() {
    super.onBind();
    subscribe(
      content.stream,
      (_) => myEntity.content('content data'),
    );
    subscribe(
      loading.stream,
      (_) => myEntity.loading('loading data'),
    );
    subscribe(
      loadingWithoutData.stream,
      (_) => myEntity.loading(),
    );
    subscribe(
      error.stream,
      (_) => myEntity.error(),
    );
  }
}

class MyHomePage extends CoreMwwmWidget {
  MyHomePage() : super(widgetModelBuilder: (_) => MyHomePageWm());

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends WidgetState<MyHomePageWm> {
  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Expanded(
          child: Center(
            child: EntityStateBuilder(
              streamedState: wm.myEntity,
              child: (context, data) => Text('Content: $data'),

              // loadingChild: Text('loadingChild'),
              loadingBuilder: (context, data) => Text('loadingBuilder: $data'),

              // errorChild: Text('errorChild'),
              errorBuilder: (context, data, e) => Text('errorBuilder'),

            ),
          ),
        ),
        Wrap(
          spacing: 10.0,
          children: [
            ElevatedButton(
              child: Text('content'),
              onPressed: wm.content,
            ),
            ElevatedButton(
              child: Text('loading'),
              onPressed: wm.loading,
            ),
            ElevatedButton(
              child: Text('loading without data'),
              onPressed: wm.loadingWithoutData,
            ),
            ElevatedButton(
              child: Text('error'),
              onPressed: wm.error,
            ),
          ],
        )
      ],
    );
  }
}

pubspec.yaml

name: loadingwmmw
description: A new Flutter project.

publish_to: 'none'

version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^1.0.2

  mwwm: ^0.1.3-dev.3
  relation: ^0.0.4-dev.1

dev_dependencies:
  flutter_test:
    sdk: flutter
flutter:
  uses-material-design: true