handleInitEvent method

@protected Stream<S> handleInitEvent()

Handles the initialization event by initializing the calculator and emitting the new state.

If the calculator can be initialized, it sets the initializing flag to true and attempts to initialize the calculator. Then, it emits the new state and triggers the initialized or initFailed event depending on the result.

Yields a stream of state changes.

Implementation

@protected
Stream<S> handleInitEvent() async* {
  if (canInitialize) {
    debugLog('Initializing calculator', debugLabel: debugLabel);

    isInitializing = true;
    yield currentState.copyWith(isInitializing: isInitializing) as S;

    try {
      await initialize();
      defaultCalculatorState = await initializeDefaultCalculatorState();
      final nextState = await initializeCalculatorState();

      yield currentState
          .merge(defaultCalculatorState)
          .merge(nextState)
          .copyWith(
            isInitializing: isInitializing,
            metadata: await loadMetadata(),
          ) as S;

      addEvent(FastCalculatorBlocEvent.initialized<R>());
    } catch (error, stacktrace) {
      addEvent(FastCalculatorBlocEvent.initFailed<R>(error, stacktrace));
    }
  }
}