# Package org.eclipse.incquery.viewers.runtime.model.listeners

- Interface Summary
  Interface | Description
  --- | ---
  IViewerLabelListener | Listener interface for label changes.
  IViewerStateListener | Listener interface for the appearance and disappearance of elements.

- Class Summary
  Class | Description
  --- | ---
  AbstractViewerLabelListener |
  AbstractViewerStateListener | An empty implementation of the `IViewerStateListener` interface.