pushCancellableRoute<T extends Object?> method

Future<T?> pushCancellableRoute<T extends Object?>(Route<T> route, Cancellable? cancellable)

推入一个可撤销的route

Implementation

Future<T?> pushCancellableRoute<T extends Object?>(
    Route<T> route, Cancellable? cancellable) {
  if (cancellable == null) return push<T>(route);
  if (cancellable.isUnavailable == true) {
    return Future.value(null);
  }

  final Cancellable showing = Cancellable();
  // showing.bindCancellable(cancellable);
  cancellable.onCancel.then((_) {
    if (showing.isAvailable) {
      scheduleMicrotask(() {
        if (showing.isAvailable && route.isActive) {
          showing.cancel();
          route.navigator?.removeRoute(route);
        }
      });
    }
  });
  showing.onCancel.then(cancellable.cancel);

  return push<T>(route).whenComplete(() => showing.cancel());
}