Ref.ChangeEvent (PraxisCORE 5.7.0 API)

java.lang.Object
- org.praxislive.code.userapi.Ref.ChangeEvent<T>

Type Parameters:

T - reference type

Enclosing class:

Ref<T>
```
public static final class Ref.ChangeEvent<T>
extends Object
```
Event passed to Ref.onChangeHandler when the Ref value changes. Provides access to the current and previous values, where they exist.

- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  Optional<T> current()
  Query the current value.
  
  Optional<T> previous()
  Query the previous value.
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - current
```
public Optional<T> current()
```
    Query the current value.
    
    Returns:
    
    current value or empty optional
  - previous
```
public Optional<T> previous()
```
    Query the previous value.
    
    Returns:
    
    previous value or empty optional