show method
Implementation
Future<void> show(bool animation) {
if (isPersistentCallbacks) {
Completer<void> completer = Completer<void>();
_ambiguate(SchedulerBinding.instance)!.addPostFrameCallback((_) =>
completer
.complete(_animationController.forward(from: animation ? 0 : 1)));
return completer.future;
} else {
return _animationController.forward(from: animation ? 0 : 1);
}
}