CollapseEvent.CollapseListener (vaadin-server 8.21.0 API)

Type Parameters:

T - the collapsed item's type

All Superinterfaces:

java.util.EventListener, java.io.Serializable, SerializableEventListener

Enclosing class:

CollapseEvent<T>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public static interface CollapseEvent.CollapseListener<T>
extends SerializableEventListener
```
Item collapse event listener.

Since:

8.1

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static java.lang.reflect.Method COLLAPSE_METHOD
- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void itemCollapse(CollapseEvent<T> event)
  Callback method for when an item has been collapsed.

- Field Detail
  - COLLAPSE_METHOD
```
static final java.lang.reflect.Method COLLAPSE_METHOD
```
- Method Detail
  - itemCollapse
```
void itemCollapse(CollapseEvent<T> event)
```
    Callback method for when an item has been collapsed.
    
    Parameters:
    
    event - the collapse event