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## org.eclipse.ui.forms.events
Interface IExpansionListener

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
`void` | `expansionStateChanged(ExpansionEvent e)` Notifies the listener after the expandable control has changed its expansion state.
`void` | `expansionStateChanging(ExpansionEvent e)` Notifies the listener that the expandable control is about to change its expansion state.

Method Detail

### expansionStateChanging

    public 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

    public 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

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