[英]flutter_bloc - hook into onClose, onCreate lifecycle events for specific cubit
I want to hook into the lifecycle events of my cubits.我想与我的肘部的生命周期事件挂钩。
I notice the blocObserver has onClose
and onCreate
, however that is for observing all cubit's lifecycle events.我注意到 blocObserver 有
onClose
和onCreate
,但是这是为了观察所有 cubit 的生命周期事件。 How do I hook into these events just for a specific cubit?我如何只针对特定的肘关节来关联这些事件? For example the equivalent of overriding
onClose
inside a cubit.例如,相当于在一肘内覆盖
onClose
。
My implementation of ChessMax's answer:我对 ChessMax 回答的实现:
class VpCubit<T> extends Cubit<T> {
VpCubit(T initial) : super(initial);
void onClose() => print('');
@override
Future<void> close() async {
if (onClose != null) {
onClose();
}
return super.close();
}
}
class LoggedOutNickNameCubit extends VpCubit<int> {
LoggedOutNickNameCubit()
: super(0);
@override
void onClose() {
print('closing');
}
void onCreate() {
print('creating');
}
}
One possible solution is to filter out events in the observing hook.一种可能的解决方案是过滤掉观察钩子中的事件。 Every event of BlocObserver has a reference to a cubit/bloc instance that sends the event.
BlocObserver 的每个事件都有一个对发送事件的 cubit/bloc 实例的引用。 So you can compare it with the reference with your specific cubit/bloc instance.
因此,您可以将其与您的特定 cubit/bloc 实例的参考进行比较。 And if references are equal you can handle it somehow.
如果引用相等,您可以以某种方式处理它。 Something like this:
像这样的东西:
class MyObserver extends BlocObserver {
final Cubit<Object> _cubit;
MyObserver(this._cubit) : assert(_cubit != null);
@override
void onClose(Cubit cubit) {
if (cubit == _cubit) {
// do whatever you need
}
super.onClose(cubit);
}
}
Another way is to create your own cubit/bloc subclass.另一种方法是创建您自己的 cubit/bloc 子类。 Override the methods you want to listen to.
覆盖你想听的方法。 And use your own BlocObserver like class to notify this specific cubit/bloc listeners.
并使用您自己的 BlocObserver 之类的类来通知此特定的 cubit/bloc 侦听器。 Something like this:
像这样的东西:
class MyObserver {
final void Function() onClose;
MyObserver(this.onClose);
}
class MyBloc extends Bloc<MyEvent, MyState> {
final MyObserver _observer;
MyBloc(this._observer) : super(MyInitial());
@override
Future<void> close() async {
if (_observer != null && _observer.onClose != null) {
_observer.onClose();
}
return super.close();
}
}
Also, I think, it's possible to write a generic cubit/bloc wrapper base class like above.另外,我认为,可以像上面那样编写通用的 cubit/bloc 包装器基类。 And then use it as a base class for all your cubits/blocs classes instead.
然后将其用作所有 cubits/blocs 类的基类。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.