The PlayerInteractBlock Event is fired whenever a player right clicks a block.
It can be canceled to prevent any other events from taking place. If the event is canceled, a specific result of success, fail or pass can be provided. By default, the result is pass.

You will need to cast the event in the function header as this class:
crafttweaker.event.PlayerInteractBlockEvent
You can, of course, also import the class before and use that name then.

PlayerInteractBlock Events implement the following interfaces and are able to call all of their methods/getters/setters as well:

• IEventCancelable
• PlayerInteract
• IPlayerEvent

The following information can be retrieved from the event:

zengetter	zensetter	type
zengetter hitvector	zensetter ​	type IVector3d
zengetter useblock	zensetter useblock	type string ("allow" / "deny" / "default")
zengetter useitem	zensetter useitem	type string ("allow" / "deny" / "default")
zengetter cancellationResult	zensetter cancellationResult	type string ("success" / "pass" / "fail")

• event.cancel() sets the event as cancelled.