| Class | Description | 
|---|---|
| Buttons | 
 A Buttons event generator is usually associated to a group of physical buttons and allow to generate events relating
 to them. 
 | 
| Command | 
 Command is an event generator that generates application-level events. 
 | 
| GenericEventGenerator | 
 Generic event generator. 
 | 
| Pointer | 
 A pointer event generator represents a pointing device that is usually associated to a group of physical buttons. 
 | 
| States | 
 A states event generator is usually associated to a group of physical devices holding a position (switch, rotary
 wheel encoder, ...) and allows to generate events relating to them. 
 |