addListener method

void addListener(
  1. SquadronCallback listener
)

Registers a listener that will be notified when the token is cancelled. If the token is already cancelled, the listener will be called immediately.

Implementation

void addListener(SquadronCallback listener) {
  if (cancelled) {
    safeInvoke(listener);
  } else {
    (_listeners ??= <SquadronCallback>[]).add(listener);
  }
}