flutter pub add event_bus根據套件公開資料產生的選型評估，僅供參考。
事件總線是一個輕量級的 Dart 套件，使用 Streams 來實現應用程式中元件之間的事件驅動通訊。它透過允許物件發布事件並訂閱事件來促進鬆散耦合，而不需直接依賴。非常適合協調應用程式不同部分的操作，例如 UI 更新、狀態變更或跨模組互動。該套件容易整合，並可在 Flutter 支援的所有主要平台無縫運行。
以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。
A simple Event Bus using Dart Streams for decoupling applications.
GitHub | Pub | Demos and Examples
An Event Bus follows the publish/subscribe pattern. It allows listeners to subscribe for events and publishers to fire events. This enables objects to interact without requiring to explicitly define listeners and keeping track of them.
The Event Bus pattern is especially helpful for decoupling MVC (or MVP) applications.
One group of MVC is not a problem.
But as soon as there are multiple groups of MVCs, those groups will have to talk to each other. This creates a tight coupling between the controllers.
By communication through an Event Bus, the coupling is reduced.
Create an instance of EventBus and make it available to other classes.
Usually there is just one Event Bus per application, but more than one may be set up to group a specific set of events.
import 'package:event_bus/event_bus.dart';
EventBus eventBus = EventBus();
Note: The default constructor will create an asynchronous event bus. To
create a synchronous bus you must provide the optional sync: true attribute.
Any Dart class can be used as an event.
class UserLoggedInEvent {
User user;
UserLoggedInEvent(this.user);
}
class NewOrderEvent {
Order order;
NewOrderEvent(this.order);
}
Register listeners for specific events:
eventBus.on<UserLoggedInEvent>().listen((event) {
// All events are of type UserLoggedInEvent (or subtypes of it).
print(event.user);
});
Register listeners for all events:
eventBus.on().listen((event) {
// Print the runtime type. Such a set up could be used for logging.
print(event.runtimeType);
});
EventBus uses Dart Streams
as its underlying mechanism to keep track of listeners. You may use all
functionality available by the Stream
API. One example is the use of StreamSubscriptions
to later unsubscribe from the events.
StreamSubscription loginSubscription = eventBus.on<UserLoggedInEvent>().listen((event) {
print(event.user);
});
loginSubscription.cancel();
Finally, we need to fire an event.
User myUser = User('Mickey');
eventBus.fire(UserLoggedInEvent(myUser));
Instead of using the default StreamController you can use the following constructor
to provide your own.
An example would be to use an RxDart Subject as the controller.
import 'package:rxdart/rxdart.dart';
EventBus behaviorBus = EventBus.customController(BehaviorSubject());
webdev servewebdev buildpub run build_runner test -- -p chromeThe MIT License (MIT)