RollupStateListener

All Known Implementing Classes:

RollupSkin, RollupStateListener.Adapter, RollupStateListener.Listeners, TerraRollupSkin
```
public interface RollupStateListener
```
Defines event listener methods that pertain to rollup state. Developers register for such events by adding themselves to a rollup's list of "rollup state listeners" (see Rollup.getRollupStateListeners()).

Nested Class Summary

Nested Classes
Modifier and Type	Interface	Description
`static class`	`RollupStateListener.Adapter`	Deprecated. Since 2.1 and Java 8 the interface itself has default implementations.
`static class`	`RollupStateListener.Listeners`	Rollup state listeners.

Method Summary

All Methods Instance Methods Default Methods
Modifier and Type	Method	Description
`default void`	`expandedChanged(Rollup rollup)`	Called when a rollup's expanded state changed.
`default void`	`expandedChangeVetoed(Rollup rollup, Vote reason)`	Called when a rollup expansion event has been vetoed.
`default Vote`	`previewExpandedChange(Rollup rollup)`	Called to preview a rollup expansion event.

- Method Detail
  - previewExpandedChange
```
default Vote previewExpandedChange(Rollup rollup)
```
    Called to preview a rollup expansion event.
    
    Parameters:
    
    rollup - The rollup that might change.
    
    Returns:
    
    The result of this listener voting on the expansion.
  - expandedChangeVetoed
```
default void expandedChangeVetoed(Rollup rollup,
                                  Vote reason)
```
    Called when a rollup expansion event has been vetoed.
    
    Parameters:
    
    rollup - The rollup that didn't change.
    
    reason - The reason the expansion was vetoed.
  - expandedChanged
```
default void expandedChanged(Rollup rollup)
```
    Called when a rollup's expanded state changed.
    
    Parameters:
    
    rollup - The rollup that did change.