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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

BlockPlaceEvent

The BlockBreak Event is fired whenever a block is being placed. You can cancel the event to prevent the block from being placed.

Event Class

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

Event interface extensions

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

ZenGetters

The following information can be retrieved from the event:

ZenGetter	ZenSetter	Type
ZenGetter `player`	ZenSetter	Type IPlayer
ZenGetter `current`	ZenSetter	Type IBlockState
ZenGetter `placedAgainst`	ZenSetter	Type IBlockState
ZenGetter `hand`	ZenSetter	Type string

ZenGetters/ZenSetters/ZenMethods from extensions

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

ZenGetter	ZenSetter	Type
ZenGetter `canceled`	ZenSetter `canceled`	Type bool
ZenGetter `world`	ZenSetter	Type IWorld
ZenGetter `blockState`	ZenSetter	Type IBlockState
ZenGetter `block`	ZenSetter	Type IBlock

ZenMethods

event.cancel(); Method, returns void (nothing). Can cancel the event and stop something from happening

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