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Event IEventManager

IBlockEvent IEventCancelable IEventHasResult IEventPositionable IMinecartEvent IPotionBrewEvent IProcessableEvent IProjectileImpactEvent IEntityEvent IExplosionEvent ILivingEvent IPlayerEvent ITickEvent AnimalTameEvent ArrowLooseEvent ArrowNockEvent BlockBreakEvent BlockHarvestDropsEvent BlockNeighborNotifyEvent BlockPlaceEvent ClientTickEvent CommandEvent CriticalHitEvent CropGrowPostEvent CropGrowPreEvent EnchantmentLevelSetEvent EnderTeleportEvent EntityJoinWorldEvent EntityLivingAttackedEvent EntityLivingDamageEvent EntityLivingDeathEvent EntityLivingDeathDropsEvent EntityLivingEquipmentChangeEvent EntityLivingFallEvent EntityLivingHealEvent EntityLivingHurtEvent EntityLivingJumpEvent EntityLivingSpawnEvent EntityLivingUpdateEvent EntityMountEvent EntityStruckByLightningEvent EntityTravelToDimensionEvent ExplosionDetonateEvent ExplosionStartEvent FarmlandTrampleEvent ItemExpireEvent ItemFishedEvent ItemTossEvent LivingDestroyBlockEvent LivingEntityUseItemEvent LivingExperienceDropEvent LivingKnockBackEvent LootingLevelEvent MinecartCollisionEvent MinecartInteractEvent MobGriefingEvent PlayerAdvancementEvent PlayerAnvilRepairEvent PlayerAnvilUpdateEvent PlayerAttackEntityEvent PlayerBonemealEvent PlayerBreakSpeedEvent PlayerBrewedPotionEvent PlayerChangedDimensionEvent PlayerCloneEvent PlayerCloseContainerEvent PlayerCraftedEvent PlayerDeathDropsEvent PlayerDestroyItemEvent PlayerFillBucketEvent PlayerInteractBlockEvent PlayerInteractEntityEvent PlayerInteractEvent PlayerItemPickupEvent PlayerLeftClickBlockEvent PlayerLoggedInEvent PlayerLoggedOutEvent PlayerOpenContainerEvent PlayerPickupItemEvent PlayerPickupXpEvent PlayerRespawnEvent PlayerRightClickItemEvent PlayerSetSpawnEvent PlayerSleepInBedEvent PlayerSmeltedEvent PlayerTickEvent PlayerUseHoeEvent PlayerVisibilityEvent PortalSpawnEvent PotionBrewPostEvent PotionBrewPreEvent ProjectileImpactArrowEvent ProjectileImpactFireballEvent ProjectileImpactThrowableEvent RenderTickEvent ServerTickEvent SleepingLocationCheckEvent SleepingTimeCheckEvent WorldTickEvent

CropGrowPreEvent

The CropGrowPre Event is fired when crops attempt to grow. It has a result which determines whether the default behaviour occurs or not:

allow: the crop is forced to grow.
deny: the crop is prevented from growing.
default: the attack uses default Vanilla behaviour.

Event Class

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

Event interface extensions

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

ZenGetters/ZenSetters

The following information can be retrieved from the event:

ZenGetter	ZenSetter	Type
ZenGetter `originalBlockState`	ZenSetter	Type IBlockState
ZenGetter `originalBlock`	ZenSetter	Type IBlock

ZenGetters/ZenSetters/ZenMethods from extensions

The following information can be retrieved from the event:

ZenGetter	ZenSetter	Type
ZenGetter `world`	ZenSetter	Type IWorld
ZenGetter `blockState`	ZenSetter	Type IBlockState
ZenGetter `block`	ZenSetter	Type IBlock
ZenGetter `result`	ZenSetter	Type string with value of `default`, `deny` or `allow`

ZenMethods

event.deny() Method, sets the event’s result to deny
event.allow() Method, sets the event’s result to allow
event.default() Method, sets the event’s result to default

From extension of extension

ZenGetter	ZenSetter	Type
ZenGetter `position`	ZenSetter	Type IBlockPos
ZenGetter `x`	ZenSetter	Type int
ZenGetter `y`	ZenSetter	Type int
ZenGetter `z`	ZenSetter	Type int