# Package org.eclipse.gef.rulers

Interface Summary
Interface | Description
--- | ---
RulerChangeListener | `RulerChangeListener`s can be added to `RulerProvider`s to receive notification about changes in the ruler/guide properties.

Class Summary
Class | Description
--- | ---
RulerChangeListener.Stub | Stub for the RulerChangeListener interface.
RulerProvider | This class provides an interface to interact with the ruler/guide feature provided in GEF.