不推荐使用EventEmitter，不应该使用 [英] EventEmitter is deprecated and shouldn't be used

问题描述

在AngularDart 3.0.0中，不推荐使用EventEmitter.那么，如何将事件从子组件发送到父组件?

In AngularDart 3.0.0 EventEmitter is deprecated. So, how to send event from child component to parent?

在更新之前，它看起来像:

Before update it is looks like:

@Component(
  selector: 'my-test',
  templateUrl: 'test.component.html'
)
class TestComponent {
  @Input()
  String name = '';

  @Output()
  EventEmitter<String> onNameChange = new EventEmitter<String>();
}

...    
onNameChange.emit('New Name');
...

现在我需要使用Stream和StreamController.有人可以举个例子吗?

Now I need use Stream and StreamController. Can someone give an example?

推荐答案

只需使用普通的StreamController

final _onNameChangeController = new StreamController<String>.broadcast();
@Output()
Stream<String> get onNameChange => _onNameChangeController.stream;

.broadcast是可选的.必须允许多个订阅者.

.broadcast is optional. It is required to allow multiple subscribers.

另请参见 https://www.dartlang.org/articles/libraries/broadcast-流

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