Hello
I have the following Class:
public class MyForm <T> extends FormLayout
I am trying to us use the Event Bus from this class.
I have this event class:
public class MyFormEvent <T> extends ComponentEvent<MyForm<T>> {
private final T data;
public MyFormEvent (MyForm<T> source, T data) {
super(source, false);
this.data = data;
}
public T getData() {
return data;
}
}
I am trying to add a listener in MyForm like such:
public void addListener(ComponentEventListener<MyFormEvent<T>> listener) {
return addListener(MyFormEvent.class, listener);
}
The error i get from this addListener method is
eventType:
Class<T> Class<MyFormEvent>
listener:
ComponentEventListener<T> ComponentEventListener<MyFormEvent<T>>
reason: Incompatible equality constraint: MyFormEvent<T> and MyFormEvent
The addListener method has the following signature
protected <T extends ComponentEvent<?>> Registration addListener(Class<T> eventType, ComponentEventListener<T> listener)
If MyForm wasn’t generic, it works. But I need an event that is generic. Is this possible?
Sadly I’m not very versed with generics. The eventType parameter of addListener is a class object.
It needs to be the same class that is used to set the Type of the ComponentEventListener which is MyFormEvent
