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
@@ -29,12 +29,19 @@
 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);
@@ -71,6 +78,9 @@
 
     }
 
+    /* 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)) {
@@ -80,6 +90,7 @@
             return super.hurt(damagesource, f);
         }
     }
+    // CraftBukkit end */
 
     @Override
     public float getWalkTargetValue(BlockPosition blockposition, IWorldReader iworldreader) {
@@ -174,10 +185,17 @@
     }
 
     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);
     }
@@ -222,6 +240,16 @@
             if (entityplayer == null && entityanimal.getLoveCause() != null) {
                 entityplayer = entityanimal.getLoveCause();
             }
+            // CraftBukkit start - call EntityBreedEvent
+            entityageable.setBaby(true);
+            entityageable.moveTo(this.getX(), this.getY(), this.getZ(), 0.0F, 0.0F);
+            int experience = this.getRandom().nextInt(7) + 1;
+            org.bukkit.event.entity.EntityBreedEvent entityBreedEvent = org.bukkit.craftbukkit.event.CraftEventFactory.callEntityBreedEvent(entityageable, this, entityanimal, entityplayer, this.breedItem, experience);
+            if (entityBreedEvent.isCancelled()) {
+                return;
+            }
+            experience = entityBreedEvent.getExperience();
+            // CraftBukkit end
 
             if (entityplayer != null) {
                 entityplayer.awardStat(StatisticList.ANIMALS_BRED);
@@ -232,12 +260,14 @@
             entityanimal.setAge(6000);
             this.resetLove();
             entityanimal.resetLove();
-            entityageable.setBaby(true);
-            entityageable.moveTo(this.getX(), this.getY(), this.getZ(), 0.0F, 0.0F);
-            worldserver.addFreshEntityWithPassengers(entityageable);
+            worldserver.addFreshEntityWithPassengers(entityageable, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.BREEDING); // CraftBukkit - added SpawnReason
             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
             }
 
         }