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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

BlockHarvestDropsEvent

The BlockHarvestDrops Event is fired whenever a block is about to drop its items.
You can modify the block list as well as the overall drop chance. Set latter to 1 if you do all chance handling beforehand.

Event Class

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

Event interface extensions

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

IBlockEvent

ZenGetters/ZenSetters

The following information can be retrieved from the event:

ZenGetter	ZenSetter	Type
ZenGetter `player`	ZenSetter	Type IPlayer
ZenGetter `isPlayer`	ZenSetter	Type bool
ZenGetter `silkTouch`	ZenSetter	Type bool
ZenGetter `fortuneLevel`	ZenSetter	Type int
ZenGetter `drops`	ZenSetter `drops`	Type List<WeightedItemStack>
ZenGetter `dropChance`	ZenSetter `dropChance`	Type float

ZenMethods

event.addItem(IItemStack) Adds the Item to the droplist

ZenGetters/ZenSetters/ZenMethodes 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

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

Adding an item to the list

You can either addAssign the list or use the method to add an item to the list:

event.drops += <minecraft:coal>;
event.addItem(<minecraft:coal>);