EventObserver

Type Parameters:

T - the type of data propagated with the event.

All Known Subinterfaces:

ComponentValue<T,C>, Event<T>, PropertyValue<T>, State, State.Combination, StateObserver, StringValue<T>, Value<T>, ValueObserver<T>, ValueSet<T>

All Known Implementing Classes:

AbstractComponentValue, AbstractTextComponentValue, AbstractValue
```
public interface EventObserver<T>
```
Manages listeners for an Event.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addDataListener(EventDataListener<T> listener)`	Adds `listener` to this `EventObserver`, adding the same listener a second time has no effect.
`void`	`addListener(EventListener listener)`	Adds `listener` to this `EventObserver`, adding the same listener a second time has no effect.
`void`	`removeDataListener(EventDataListener<T> listener)`	Removes `listener` from this `EventObserver`
`void`	`removeListener(EventListener listener)`	Removes `listener` from this `EventObserver`

- Method Detail
  - addListener
```
void addListener(EventListener listener)
```
    Adds listener to this EventObserver, adding the same listener a second time has no effect.
    
    Parameters:
    
    listener - the listener to add
    
    Throws:
    
    NullPointerException - in case listener is null
  - removeListener
```
void removeListener(EventListener listener)
```
    Removes listener from this EventObserver
    
    Parameters:
    
    listener - the listener to remove
  - addDataListener
```
void addDataListener(EventDataListener<T> listener)
```
    Adds listener to this EventObserver, adding the same listener a second time has no effect.
    
    Parameters:
    
    listener - the listener to add
    
    Throws:
    
    NullPointerException - in case listener is null
  - removeDataListener
```
void removeDataListener(EventDataListener<T> listener)
```
    Removes listener from this EventObserver
    
    Parameters:
    
    listener - the listener to remove