eventhandler 1.0.4

EventHandler for dart #

Simple event handler with singleton constructor. An event is associated with each type of object that it inherits from EventBase.

Examples #

Implement custom event #

    class CustomEvent extends EventBase {}

Create a method that receives the custom event type #

    void _onCustomEventCallback(CustomEvent event) {
        print("CustomEvent received");
    }

Subscribe to the event #

  @override
  void initState() {
    EventHandler()
        .subscribe(_onCustomEventCallback);
    super.initState();
  }

Send event #

    RaisedButton(
        onPressed: () =>
            EventHandler().send(CustomEvent())              
    )

Remember unsubscribe to the event #

    @override
    void dispose() {
        EventHandler()
            .unsubscribe(_decreaseCounter);
        super.dispose();
    }

License #

This library is licensed under MIT.

1.0.3 (2019-06-09) #

  • Added example

1.0.2 (2019-06-09) #

  • Added comments

1.0.1 (2019-06-09) #

  • Minor changes

1.0.0 (2019-06-09) #

  • Initial state

example/example.dart

import 'package:eventhandler/eventhandler.dart';
import 'package:flutter/material.dart';

import 'events.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'EventHandler Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'EventHandler Example'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  @override
  void initState() {
    EventHandler()
        .subscribe(_onDecrementCounter)
        .subscribe(_onIncrementCounter);
    super.initState();
  }

  @override
  void dispose() {
    EventHandler()
        .unsubscribe(_onDecrementCounter)
        .unsubscribe(_onIncrementCounter);
    super.dispose();
  }

  void _onIncrementCounter(Increment event) {
    setState(() {
      _counter++;
    });
  }

  void _onDecrementCounter(Decrement event) {
    setState(() {
      _counter--;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceAround,
              children: <Widget>[
                RaisedButton(
                  child: Text("Decrement"),
                  color: Colors.red,
                  onPressed: () {
                    EventHandler().send(Decrement());
                  },
                ),
                RaisedButton(
                  child: Text("Increment"),
                  color: Colors.green,
                  onPressed: () {
                    EventHandler().send(Increment());
                  },
                ),
              ],
            )
          ],
        ),
      ),
    );
  }
}

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  eventhandler: ^1.0.4

2. Install it

You can install packages from the command line:

with Flutter:


$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:eventhandler/eventhandler.dart';
  
Popularity:
Describes how popular the package is relative to other packages. [more]
38
Health:
Code health derived from static analysis. [more]
100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
100
Overall:
Weighted score of the above. [more]
69
Learn more about scoring.

We analyzed this package on Sep 19, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.5.0
  • pana: 0.12.21
  • Flutter: 1.9.1+hotfix.2

Platforms

Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.7
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies
flutter_test