Firefly Package Logo

Create beautiful Flutter widget trees using this handy Firestore builder widget.

Usage

There is three steps to start using Firefly.

Setup Firebase

We recommend following the FlutterFire guide to setup your app with Firebase.

It´s important to setup Firebase before using any Firefly widgets.

We like to use a FutureBuilder to initialize Firebase.

Widget build(BuildContext context) {
    final Future<FirebaseApp> _initialization = Firebase.initializeApp();

    return FutureBuilder(
      // Initialize FlutterFire:
      future: _initialization,
      builder: (context, snapshot) {
        // Check for errors
        if (snapshot.hasError) {
          return Text('THERE WAS AN ERROR...');
        }

        // Once complete, show your application
        if (snapshot.connectionState == ConnectionState.done) {
          return FireflyApp();
        }

        // Otherwise, show something whilst waiting for initialization to complete
        return Text('LOADING...');
      },
    );
  }

Use the FireflyProvider

The FireflyProvider will provide all Firefly widgets with the correct instance of your Firestore database. It also needs a list of FireflyDataBuilder. The purpose of the FireflyDataBuilder is to provide Firefly with the correct model and constuctor so it can create your objects before you can access them in the various builder parameters.

class FireflyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
  
    final firestore = FirebaseFirestore.instance;
    
    final buildList = [
      FireflyDataBuilder(
        model: Person,
        builder: (json) => Person.fromJson(json),
      )
    ];
    
    return FireflyProvider(
      instance: firestore,
      modelbuilderList: buildList,
      child: App(),
    );
  }
}

Finally, you can use Firefly

Firefly requires two things to work correctly. The collection parameter is used so Firefly knows which Firestore Collection to retrive data from. The type object expected to accessed in the various builder parametes. Here we expect a Person by adding <Person>

We can then use the builder to get a list of Person objects, here described as state.

class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Firefly<Person>(
          collection: 'persons',
          builder: (context, state) => ListView.builder(
            itemCount: state.length,
            itemBuilder: (context, index) => Text(state[index].name),
          ),
        ),
      ),
    );
  }
}

Using the Firefly widget

The Firefly widget has a bunch of parameters:

listBuilder

The builder is one way to use retrive the created objects. But you can also use the shorthand listBuilder to get a already created ListView with objects.

You can´t combine many builders, so remember to only use one per Firefly widget.

Firefly<Person>(
  collection: 'persons',
  listBuilder: (context, state, index) => Text(state[index].name),
),

Querying

You can also query the Firestore directly on the widget. Use the query parameter and the Query model.

Just make sure you hide the Firestore Query in your import with:

import 'package:cloud_firestore/cloud_firestore.dart' hide Query;

Firefly<Person>(
  collection: 'persons',
  listBuilder: (context, state, index) => Text(state[index].name),
  query: Query('age')..isEqualTo(22),
),

Override Loading

Want to show another widget when the Firestore is loading. Just override the loading parameter with any widget you like.

Firefly<Person>(
  collection: 'players',
  listBuilder: (context, state, index) => Text(state[index].name),
  loading: Container(
    width: 200,
    height: 200,
    color: Colors.red,
  ),
),

Handle Errors

If you get an error receiving your data, handle it with the error parameter.

Firefly<Person>(
  collection: 'players',
  listBuilder: (context, state, index) => Text(state[index].name),
  error: (error) => Text(error.toString()),
),

Libraries

firefly