PaperMC/paper-server/nms-patches/net/minecraft/world/entity/animal/EntityAnimal.patch

--- a/net/minecraft/world/entity/animal/EntityAnimal.java
+++ b/net/minecraft/world/entity/animal/EntityAnimal.java
@@ -30,12 +30,19 @@
 import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.pathfinder.PathType;
 
+// CraftBukkit start
+import net.minecraft.world.entity.EntityTameableAnimal;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.event.entity.EntityEnterLoveModeEvent;
+// CraftBukkit end
+
 public abstract class EntityAnimal extends EntityAgeable {
 
     protected static final int PARENT_AGE_AFTER_BREEDING = 6000;
     public int inLove;
     @Nullable
     public UUID loveCause;
+    public ItemStack breedItem; // CraftBukkit - Add breedItem variable
 
     protected EntityAnimal(EntityTypes<? extends EntityAnimal> entitytypes, World world) {
         super(entitytypes, world);
@@ -72,6 +79,9 @@
 
     }
 
+    /* CraftBukkit start
+    // Function disabled as it has no special function anymore after
+    // setSitting is disabled.
     @Override
     public boolean hurt(DamageSource damagesource, float f) {
         if (this.isInvulnerableTo(damagesource)) {
@@ -81,6 +91,7 @@
             return super.hurt(damagesource, f);
         }
     }
+    // CraftBukkit end */
 
     @Override
     public float getWalkTargetValue(BlockPosition blockposition, IWorldReader iworldreader) {
@@ -175,10 +186,17 @@
     }
 
     public void setInLove(@Nullable EntityHuman entityhuman) {
-        this.inLove = 600;
+        // CraftBukkit start
+        EntityEnterLoveModeEvent entityEnterLoveModeEvent = CraftEventFactory.callEntityEnterLoveModeEvent(entityhuman, this, 600);
+        if (entityEnterLoveModeEvent.isCancelled()) {
+            return;
+        }
+        this.inLove = entityEnterLoveModeEvent.getTicksInLove();
+        // CraftBukkit end
         if (entityhuman != null) {
             this.loveCause = entityhuman.getUUID();
         }
+        this.breedItem = entityhuman.getInventory().getSelected(); // CraftBukkit
 
         this.level().broadcastEntityEvent(this, (byte) 18);
     }
@@ -220,12 +238,29 @@
         if (entityageable != null) {
             entityageable.setBaby(true);
             entityageable.moveTo(this.getX(), this.getY(), this.getZ(), 0.0F, 0.0F);
-            this.finalizeSpawnChildFromBreeding(worldserver, entityanimal, entityageable);
-            worldserver.addFreshEntityWithPassengers(entityageable);
+            // CraftBukkit start - call EntityBreedEvent
+            EntityPlayer breeder = Optional.ofNullable(this.getLoveCause()).or(() -> {
+                return Optional.ofNullable(entityanimal.getLoveCause());
+            }).orElse(null);
+            int experience = this.getRandom().nextInt(7) + 1;
+            org.bukkit.event.entity.EntityBreedEvent entityBreedEvent = org.bukkit.craftbukkit.event.CraftEventFactory.callEntityBreedEvent(entityageable, this, entityanimal, breeder, this.breedItem, experience);
+            if (entityBreedEvent.isCancelled()) {
+                return;
+            }
+            experience = entityBreedEvent.getExperience();
+            this.finalizeSpawnChildFromBreeding(worldserver, entityanimal, entityageable, experience);
+            worldserver.addFreshEntityWithPassengers(entityageable, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.BREEDING);
+            // CraftBukkit end
         }
     }
 
     public void finalizeSpawnChildFromBreeding(WorldServer worldserver, EntityAnimal entityanimal, @Nullable EntityAgeable entityageable) {
+        // CraftBukkit start
+        this.finalizeSpawnChildFromBreeding(worldserver, entityanimal, entityageable, this.getRandom().nextInt(7) + 1);
+    }
+
+    public void finalizeSpawnChildFromBreeding(WorldServer worldserver, EntityAnimal entityanimal, @Nullable EntityAgeable entityageable, int experience) {
+        // CraftBukkit end
         Optional.ofNullable(this.getLoveCause()).or(() -> {
             return Optional.ofNullable(entityanimal.getLoveCause());
         }).ifPresent((entityplayer) -> {
@@ -238,7 +273,11 @@
         entityanimal.resetLove();
         worldserver.broadcastEntityEvent(this, (byte) 18);
         if (worldserver.getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT)) {
-            worldserver.addFreshEntity(new EntityExperienceOrb(worldserver, this.getX(), this.getY(), this.getZ(), this.getRandom().nextInt(7) + 1));
+            // CraftBukkit start - use event experience
+            if (experience > 0) {
+                worldserver.addFreshEntity(new EntityExperienceOrb(worldserver, this.getX(), this.getY(), this.getZ(), experience));
+            }
+            // CraftBukkit end
         }
 
     }