removeListener method

@override void removeListener(VoidCallback listener)

Remove a previously registered closure from the list of closures that the object notifies.

Implementation

@override
void removeListener(VoidCallback listener) {
  for (var i = 0; i < _count; i++) {
    final listenerAtIndex = _listeners[i];
    final target = listenerAtIndex?.target;
    // Remove the matching listener as well as weak references that no longer
    // point to listeners, same as _garbageCollect().
    if (target == listener || (target == null && listenerAtIndex != null)) {
      if (_notificationCallStackDepth > 0) {
        _listeners[i] = null;
        _reentrantlyRemovedListeners++;
      } else {
        _removeAt(i);
      }
      break;
    }
  }
}