Add EntityLandEvent

paper-api/src/main/java/io/papermc/paper/event/entity/EntityLandEvent.java

@@ -0,0 +1,61 @@
+package io.papermc.paper.event.entity;
+
+import org.bukkit.block.Block;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.entity.EntityEvent;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Called when an {@link Entity} lands on the block after falling.
+ * This event is called before {@link org.bukkit.event.entity.EntityDamageEvent}, {@link org.bukkit.event.entity.EntityChangeBlockEvent}, {@link org.bukkit.event.player.PlayerInteractEvent}
+ * and {@link org.bukkit.event.entity.EntityInteractEvent}.
+ */
+@NullMarked
+public class EntityLandEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final Block block;
+    private boolean cancelled;
+
+    public EntityLandEvent(final Entity entity, final Block block) {
+        super(entity);
+        this.block = block;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+
+    /**
+     * Returns the block that the entity landed on.
+     *
+     * @return the block that the entity landed on
+     */
+    public Block getBlock() {
+        return this.block;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    /**
+     * Sets whether to cancel the landing, cancelling this event will prevent
+     * the entity from taking fall damage and interact with the block. (ex: break turtle egg)
+     *
+     * @param cancel true if the event should be cancelled, false otherwise
+     */
+    @Override
+    public void setCancelled(final boolean cancel) {
+        this.cancelled = cancel;
+    }
+}

paper-server/patches/sources/net/minecraft/world/level/block/Block.java.patch

@@ -170,6 +170,16 @@
      }
 
      public void setPlacedBy(final Level level, final BlockPos pos, final BlockState state, final @Nullable LivingEntity by, final ItemStack itemStack) {
+@@ -488,6 +_,9 @@
+     }
+
+     public void fallOn(final Level level, final BlockState state, final BlockPos pos, final Entity entity, final double fallDistance) {
++        if(!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityLandEvent(state, level, pos, entity, false)){ // Paper start - Add EntityLandEvent
++            return;
++        } // Paper end - Add EntityLandEvent
+         entity.causeFallDamage(fallDistance, 1.0F, entity.damageSources().fall());
+     }
+
 @@ -613,12 +_,20 @@
          return this.builtInRegistryHolder;
      }

paper-server/patches/sources/net/minecraft/world/level/block/FarmlandBlock.java.patch

@@ -1,6 +1,6 @@
 --- a/net/minecraft/world/level/block/FarmlandBlock.java
 +++ b/net/minecraft/world/level/block/FarmlandBlock.java
-@@ -94,31 +_,59 @@
+@@ -94,31 +_,62 @@
      @Override
      protected void randomTick(final BlockState state, final ServerLevel level, final BlockPos pos, final RandomSource random) {
          int moisture = state.getValue(MOISTURE);
@@ -21,6 +21,9 @@
 
      @Override
      public void fallOn(final Level level, final BlockState state, final BlockPos pos, final Entity entity, final double fallDistance) {
++        if(!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityLandEvent(state, level, pos, entity, true)){ // Paper start - Add EntityLandEvent
++            return;
++        } // Paper end - Add EntityLandEvent
 +        super.fallOn(level, state, pos, entity, fallDistance); // CraftBukkit - moved here as game rules / events shouldn't affect fall damage.
          if (level instanceof ServerLevel serverLevel
              && level.getRandom().nextFloat() < fallDistance - 0.5

paper-server/patches/sources/net/minecraft/world/level/block/HoneyBlock.java.patch

@@ -1,5 +1,15 @@
 --- a/net/minecraft/world/level/block/HoneyBlock.java
 +++ b/net/minecraft/world/level/block/HoneyBlock.java
+@@ -51,6 +_,9 @@
+
+     @Override
+     public void fallOn(final Level level, final BlockState state, final BlockPos pos, final Entity entity, final double fallDistance) {
++        if(!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityLandEvent(state, level, pos, entity, true)){ // Paper start - Add EntityLandEvent
++            return;
++        } // Paper end - Add EntityLandEvent
+         entity.playSound(SoundEvents.HONEY_BLOCK_SLIDE, 1.0F, 1.0F);
+         if (!level.isClientSide()) {
+             level.broadcastEntityEvent(entity, EntityEvent.HONEY_JUMP);
 @@ -70,6 +_,7 @@
          final InsideBlockEffectApplier effectApplier,
          final boolean isPrecise

paper-server/patches/sources/net/minecraft/world/level/block/PointedDripstoneBlock.java.patch

@@ -1,8 +1,12 @@
 --- a/net/minecraft/world/level/block/PointedDripstoneBlock.java
 +++ b/net/minecraft/world/level/block/PointedDripstoneBlock.java
-@@ -63,7 +_,7 @@
+@@ -62,8 +_,11 @@
+
      @Override
      public void fallOn(final Level level, final BlockState state, final BlockPos pos, final Entity entity, final double fallDistance) {
++        if(!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityLandEvent(state, level, pos, entity, true)){ // Paper start - Add EntityLandEvent
++            return;
++        } // Paper end - Add EntityLandEvent
          if (state.getValue(TIP_DIRECTION) == Direction.UP && state.getValue(THICKNESS) == SpeleothemThickness.TIP) {
 -            entity.causeFallDamage(fallDistance + 2.5, 2.0F, level.damageSources().stalagmite());
 +            entity.causeFallDamage(fallDistance + 2.5, 2.0F, level.damageSources().stalagmite().eventBlockDamager(level, pos)); // CraftBukkit

paper-server/patches/sources/net/minecraft/world/level/block/PowderSnowBlock.java.patch

@@ -30,3 +30,13 @@
                      level.destroyBlock(position, false);
                  }
              }
+@@ -104,6 +_,9 @@
+
+     @Override
+     public void fallOn(final Level level, final BlockState state, final BlockPos pos, final Entity entity, final double fallDistance) {
++        if(!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityLandEvent(state, level, pos, entity, true)){ // Paper start - Add EntityLandEvent
++            return;
++        } // Paper end - Add EntityLandEvent
+         if (!(fallDistance < 4.0) && entity instanceof LivingEntity livingEntity) {
+             LivingEntity.Fallsounds entityFallsounds = livingEntity.getFallSounds();
+             SoundEvent fallSound = fallDistance < 7.0 ? entityFallsounds.small() : entityFallsounds.big();

paper-server/patches/sources/net/minecraft/world/level/block/SlimeBlock.java.patch

@@ -0,0 +1,12 @@
+--- a/net/minecraft/world/level/block/SlimeBlock.java
++++ b/net/minecraft/world/level/block/SlimeBlock.java
+@@ -21,6 +_,9 @@
+
+     @Override
+     public void fallOn(final Level level, final BlockState state, final BlockPos pos, final Entity entity, final double fallDistance) {
++        if(!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityLandEvent(state, level, pos, entity, false)){ // Paper start - Add EntityLandEvent
++            return;
++        } // Paper end - Add EntityLandEvent
+         if (!entity.isSuppressingBounce()) {
+             entity.causeFallDamage(fallDistance, 0.0F, level.damageSources().fall());
+         }

paper-server/patches/sources/net/minecraft/world/level/block/TurtleEggBlock.java.patch

@@ -1,5 +1,15 @@
 --- a/net/minecraft/world/level/block/TurtleEggBlock.java
 +++ b/net/minecraft/world/level/block/TurtleEggBlock.java
+@@ -63,6 +_,9 @@
+
+     @Override
+     public void fallOn(final Level level, final BlockState state, final BlockPos pos, final Entity entity, final double fallDistance) {
++        if(!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityLandEvent(state, level, pos, entity, true)){ // Paper start - Add EntityLandEvent
++            return;
++        } // Paper end - Add EntityLandEvent
+         if (!(entity instanceof Zombie)) {
+             this.destroyEgg(level, state, pos, entity, 3);
+         }
 @@ -75,6 +_,19 @@
              && level instanceof ServerLevel serverLevel
              && this.canDestroyEgg(serverLevel, entity)

paper-server/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java

@@ -12,6 +12,7 @@
 import io.papermc.paper.event.block.BlockLockCheckEvent;
 import io.papermc.paper.event.connection.PlayerConnectionValidateLoginEvent;
 import io.papermc.paper.event.entity.EntityIgniteEvent;
+import io.papermc.paper.event.entity.EntityLandEvent;
 import io.papermc.paper.event.entity.ItemTransportingEntityValidateTargetEvent;
 import io.papermc.paper.event.player.PlayerBedFailEnterEvent;
 import io.papermc.paper.event.player.PlayerToggleEntityAgeLockEvent;
@@ -69,6 +70,7 @@
 import net.minecraft.world.level.Explosion;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.LevelAccessor;
+import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.entity.SignBlockEntity;
 import net.minecraft.world.level.block.state.properties.NoteBlockInstrument;
@@ -2425,4 +2427,15 @@ public static int callEntityIgniteEvent(Entity entity, int fuseTime) {
         }
         return event.getFuseTime();
     }
+
+    public static boolean callEntityLandEvent(net.minecraft.world.level.block.state.BlockState state, Level level, BlockPos pos, Entity entity, boolean isOverrideMethod) {
+        if (EntityLandEvent.getHandlerList().getRegisteredListeners().length == 0) {
+            return true; // No listeners, skip event creation
+        }
+        if(!isOverrideMethod && (state.is(Blocks.POINTED_DRIPSTONE) || state.is(Blocks.TURTLE_EGG) || state.is(Blocks.FARMLAND))){
+            return true; // Event will be called in the class separately
+        }
+        EntityLandEvent event = new EntityLandEvent(entity.getBukkitEntity(), CraftBlock.at(level, pos));
+        return event.callEvent();
+    }
 }