jeffhigham-f3/flutter_isolates

Example using Dart isolates to run run compute tasks in Flutter

Flutter Isolates

Example counter app using isolates to process data. For demonstration only, generally you should never need to spawn a dedicated Isolate.

import 'dart:isolate';

void _uselessCounter(int start) {
  var count = start;
  while (true) {
    sleep(
      const Duration(
        seconds: 5,
      ),
    );
    debugPrint('isolate: $count');
    count++;
  }
}

  @override
  void initState() {
    super.initState();
    Isolate.spawn(_uselessCounter, 0);
  }

class CounterCubit extends Cubit<int> {
  CounterCubit() : super(0);

  void increment() async => emit(
        await compute(
          (int c) {
            sleep(const Duration(seconds: 1));
            return c + 1;
          },
          state,
        ),
      );

  void decrement() async => emit(
        await compute((int c) => c - 1, state),
      );
}