micro_bloc

Description:

micro bloc

MicroBLoC #


Micro bloc is a dead-simple flutter state management library made for quickly implementing the bloc pattern. It internally uses rxdart for streams.
This package is great for small project. But for medium-large projects. I recommend using the official bloc and flutter_bloc libraries.
Things this library provides:

Provides a BlocListener and BlocBuilder to listen and build on events.
Bloc implementation in 200 lines of code.

You can find the example here: example
Bloc:

class CounterBloc extends Bloc<CounterEvent, CounterState> {
CounterBloc() : super(const CounterStateInitial(0));
int counter = 0;

/// Listen and emit states based on events
@override
void add(CounterEvent event) {
if (event is IncrementEvent) {
counter = counter + 1;
if (counter < 0) {
emit(const ValueBelowZero());
}
emit(UpdateValue(counter));
}
if (event is DecrementEvent) {
counter = counter - 1;
emit(UpdateValue(counter + 1));
}
}
}
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BlocBuilder:
BlocBuilder<CounterEvent, CounterState>(
bloc: _bloc,
buildWhen: (previous, current) => current is! ValueBelowZero,
builder: (context, CounterState state) {
if (state is UpdateValue) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'You have pushed the button this many times:',
),
Text(
'${state.value}',
style: Theme.of(context).textTheme.headline4,
),
],
);
}
return const SizedBox();
},
),
),
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BlocListener:
BlocListener<CounterEvent, CounterState>(
bloc: _bloc,
listener: (context, state) {
if (state is ValueBelowZero) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('Value is below zero')),
);
}
},
)
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Dispatching/Adding events:
FloatingActionButton(
onPressed: () => _bloc.add(const IncrementEvent()),
child: const Icon(Icons.add),
),
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