close<T extends Object?> method Null safety

  1. @override
void close<T extends Object?>(
  1. [T? result]
)
override

Close the current top most location.

result to return when the location is closed.

result is the value by which navigateTo future complete.

Implementation

@override
void close<T extends Object?>([final T? result]) {
  assert(_pages.isNotEmpty, "there's no page in the stack to close");
  assert(_pages.length > 1, "You can't remove the only page in the stack");
  final DBPage topPage = _pages.removeAt(_pages.length - 1);

  final Completer<Object?>? tracker = _popResultTracker.remove(
    topPage.destination.path,
  );

  if (tracker != null && !tracker.isCompleted) {
    tracker.complete(result);
  }

  notifyListeners();
}