事件和肘节通讯

Question

在为我的一个集团构建逻辑时，我面临着挑战。我有一个使用我的预订服务的集团，该服务反过来对服务器进行 API 调用，并根据收到的响应发出一些状态。然而，此服务需要一个动态的过滤器参数，并且是我的过滤器肘部发出的状态的结果。如何在我的过滤肘节和我的预订活动之间建立通信。我的伪代码如下所示。

class BookingsBloc{
onGetBookingsEvent(GetBookings event, Emitter<BookingState> emit)
{
final bookingContent=bookingService.getBookings(event.bookingFilter);
}
}

class GetBookingsEvent{
Map<String,dynamic> bookingsFilter;
GetBookings(this.bookingsFilter)
{
//The above booking filter should come from my filter cubit state.
}
}

//过滤器状态看起来像这样。

class FilterState extends Equatable {
bool activeOnly;
dynamic filterByIdentifier;
List<String>? orderTypes;
String? loadPort;
String? dischargePort;
String? customerReferenceNumber;
String? fromDate;
String? toDate;
bool submittedSI;
bool draftSI;

FilterState(
  {this.activeOnly = true,
  this.filterByIdentifier,
  this.orderTypes,
  this.loadPort,
  this.dischargePort,
  this.customerReferenceNumber,
  this.fromDate = "",
  this.toDate = "",
  this.submittedSI = false,
  this.draftSI = false});

FilterState copyWith({
activeOnly,
filterByIdentifier,
orderTypes,
loadPort,
dischargePort,
customerReferenceNumber,
fromDate,
toDate,
submittedSI,
draftSI,
}) {
return FilterState(
    activeOnly: activeOnly ?? this.activeOnly,
    filterByIdentifier: filterByIdentifier ?? this.filterByIdentifier,
    orderTypes: orderTypes ?? this.orderTypes,
    loadPort: loadPort ?? this.loadPort,
    dischargePort: dischargePort ?? this.dischargePort,
    customerReferenceNumber:
        customerReferenceNumber ?? this.customerReferenceNumber,
    fromDate: fromDate ?? this.fromDate,
    toDate: toDate ?? this.toDate,
    submittedSI: this.submittedSI,
    draftSI: this.draftSI);
}

Map<String, dynamic> toMap() {
return {
  "activeOnly": activeOnly,
  "filterByIdentifier": filterByIdentifier,
  "orderTypes": orderTypes,
  "loadPort": loadPort,
  "dischargePort": dischargePort,
  "customerReferenceNumber": customerReferenceNumber,
  "fromDate": fromDate,
  "toDate": toDate,
  "submittedSI": submittedSI,
  "draftSI": draftSI
};
}

如何在预订事件类中监听正确的状态，或者是否有更好的方法来做到这一点。任何帮助将不胜感激。

Answer 1

我认为你可以使用 BlocListener 来解决这个任务。 https://bloclibrary.dev/#/flutterbloccoreconcepts?id=bloclistener
它可以监听您的状态并做出反应。此外，尝试将任务划分为子任务，并在架构中使用单一责任原则。 https://www. digitalocean.com/community/conceptual_articles/solid-the-first- Five-principles-of-object-orient-design
另请注意，同时使用 Bloc 和 Cubit 看起来很奇怪。通常使用两者之一。