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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

PotionBrewPre

This event is fired directly before vanilla brewing takes place, and, if canceled, will prevent brewing from taking place. If cancelled but the items are modified, then the PotionBrewPostEvent will be automatically fired. This allows for a simulacrum of “modded” brewing.

Event Class

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

Event interface extensions

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

ZenGetters/ZenSetters/ZenMethods from extension

The following information can be retrieved/set during the event:

ZenGetter	ZenSetter	Type
ZenGetter `length`	ZenSetter	Type int
ZenGetter `canceled`	ZenSetter `canceled`	Type bool

ZenMethods

event.cancel(); Method, returns void (nothing). Can cancel the event and stop something from happening
event.getItem(int) returns IItemStack on the given index in the crafting station. Will return an empty IItemStack if the specified index is greater than length.
event.setItem(int, IItemStack) Replaces or sets IItemStack on given index. If the index is greater than the length of the item array, nothing will happen.

Note

This event is fired right as the calculations for the recipe are taking place, when the “timer” reaches “maximum progress”.