From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <Blake.Galbreath@GMail.com>
Date: Sat, 8 Feb 2020 23:26:11 -0600
Subject: [PATCH] Entity Jump API


diff --git a/src/main/java/net/minecraft/server/EntityLiving.java b/src/main/java/net/minecraft/server/EntityLiving.java
index fe88548ff1e63c5c43351dd0dd3bf383cb985409..f92d078ab77fd7386586ac05aea1686273b44ee1 100644
--- a/src/main/java/net/minecraft/server/EntityLiving.java
+++ b/src/main/java/net/minecraft/server/EntityLiving.java
@@ -2764,8 +2764,10 @@ public abstract class EntityLiving extends Entity {
             } else if (this.aQ() && (!this.onGround || d7 > d8)) {
                 this.c((Tag) TagsFluid.LAVA);
             } else if ((this.onGround || flag && d7 <= d8) && this.jumpTicks == 0) {
+                if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper
                 this.jump();
                 this.jumpTicks = 10;
+                } else { this.setJumping(false); } // Paper - setJumping(false) stops a potential loop
             }
         } else {
             this.jumpTicks = 0;
diff --git a/src/main/java/net/minecraft/server/EntityPanda.java b/src/main/java/net/minecraft/server/EntityPanda.java
index 7de157388922c4d3ff52866d5c0ac20189a9ccf8..b36cc95168c6e6fbf668ebe15c1fa10b54e570d3 100644
--- a/src/main/java/net/minecraft/server/EntityPanda.java
+++ b/src/main/java/net/minecraft/server/EntityPanda.java
@@ -435,7 +435,9 @@ public class EntityPanda extends EntityAnimal {
             EntityPanda entitypanda = (EntityPanda) iterator.next();
 
             if (!entitypanda.isBaby() && entitypanda.onGround && !entitypanda.isInWater() && entitypanda.fh()) {
+                if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper
                 entitypanda.jump();
+                } else { this.setJumping(false); } // Paper - setJumping(false) stops a potential loop
             }
         }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
index 2fccc6a8a3dcf96e8ec714c2f7fa2f62af60cb76..b8e29172a17ad7e30134ff8c63815c71ff1d19d1 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -789,5 +789,20 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
     public boolean isHandRaised() {
         return getHandle().isHandRaised();
     }
+
+    @Override
+    public boolean isJumping() {
+        return getHandle().jumping;
+    }
+
+    @Override
+    public void setJumping(boolean jumping) {
+        getHandle().setJumping(jumping);
+        if (jumping && getHandle() instanceof EntityInsentient) {
+            // this is needed to actually make a mob jump
+            ((EntityInsentient) getHandle()).getControllerJump().jump();
+        }
+    }
+
     // Paper end
 }