Flext Bloc

A bunch of extensions for flutter_bloc package.

Check out the main Flext package to see other useful extensions.

Getting started

Install the package by running the following command:

flutter pub add flext_bloc

Then you can import the package and use all its extensions.

Features

BuildContext

tryRead

Returns the bloc of a certain type T if it is available in the context, otherwise returns null.

final bloc = context.tryRead<T>();

provide

Provides the input widget with a bloc from the context.

context.provide<T>(widget);

// Instead of
BlocProvider.value(
  value: BlocProvider.of<T>(context),
  child: widget,
);

tryProvide

Provides the input widget with a bloc from the context if it is available, otherwise returns the input widget itself.

It's like provide but it does not throw an exception if the bloc is not found in the context.

Navigator

pushBlocListenerBarrier

Pushes a barrier to bloc user input while listening to a bloc in order to decide when to pop the barrier itself.

NOTE: this function works also with cubits.

// CounterBloc example here:
// https://gist.github.com/felangel/fc8230776591f0297e6a1d1b5ef46a6c#file-main-dart

context.pushBlocListenerBarrier<CounterBloc, int>(
  bloc: counterBloc,
  trigger: () => counterBloc.add(Increment())
  listener: (context, state) {
    if(state >= 1) {
      Navigator.of(context).pop();
    }
  },
);

pushBlocListenerBarrierWithEvent

Like pushBlocListenerBarrier but it takes directly a bloc event instead of a trigger function.

context.pushBlocListenerBarrierWithEvent<CounterBloc, int>(
  bloc: counterBloc,
  event: Increment(),
  listener: (context, state) {
    if(state >= 1) {
      Navigator.of(context).pop();
    }
  },
);