IExpansionListener (Eclipse Platform API Specification)

All Known Implementing Classes:

ExpansionAdapter
```
public interface IExpansionListener
```
Classes that implement this interface will be notified before and after the expandable control's expansion state changes.

Since:

3.0

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`expansionStateChanged(ExpansionEvent e)`	Notifies the listener after the expandable control has changed its expansion state.
`static IExpansionListener`	`expansionStateChangedAdapter(Consumer<ExpansionEvent> consumer)`	Static helper method to create a `IExpansionListener` for the `expansionStateChanged(ExpansionEvent)` method, given a lambda expression or a method reference.
`void`	`expansionStateChanging(ExpansionEvent e)`	Notifies the listener that the expandable control is about to change its expansion state.
`static IExpansionListener`	`expansionStateChangingAdapter(Consumer<ExpansionEvent> consumer)`	Static helper method to create a `IExpansionListener` for the `expansionStateChanging(ExpansionEvent)` method, given a lambda expression or a method reference.

- Method Detail
  - expansionStateChanging
```
void expansionStateChanging(ExpansionEvent e)
```
    Notifies the listener that the expandable control is about to change its expansion state. The state provided by the event is the new state.
    
    Parameters:
    
    e - the expansion event
  - expansionStateChanged
```
void expansionStateChanged(ExpansionEvent e)
```
    Notifies the listener after the expandable control has changed its expansion state. The state provided by the event is the new state.
    
    Parameters:
    
    e - the expansion event
  - expansionStateChangingAdapter
```
static IExpansionListener expansionStateChangingAdapter(Consumer<ExpansionEvent> consumer)
```
    Static helper method to create a IExpansionListener for the expansionStateChanging(ExpansionEvent) method, given a lambda expression or a method reference.
    
    Parameters:
    
    consumer - the consumer of the event
    
    Returns:
    
    IExpansionListener
    
    Since:
    
    3.9
  - expansionStateChangedAdapter
```
static IExpansionListener expansionStateChangedAdapter(Consumer<ExpansionEvent> consumer)
```
    Static helper method to create a IExpansionListener for the expansionStateChanged(ExpansionEvent) method, given a lambda expression or a method reference.
    
    Parameters:
    
    consumer - the consumer of the event
    
    Returns:
    
    IExpansionListener
    
    Since:
    
    3.9