Paper/patches/server/0371-Entity-Jump-API.patch

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/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 77f79aa787aae0b146f84030d07df9d71e1637c5..a30f71d4558040e42f061d056a2ae26db3b9ce57 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3180,8 +3180,10 @@ public abstract class LivingEntity extends Entity {
             } else if (this.isInLava() && (!this.onGround || d7 > d8)) {
                 this.jumpInLiquid(FluidTags.LAVA);
             } else if ((this.onGround || flag && d7 <= d8) && this.noJumpDelay == 0) {
+                if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper
                 this.jumpFromGround();
                 this.noJumpDelay = 10;
+                } else { this.setJumping(false); } // Paper - setJumping(false) stops a potential loop
             }
         } else {
             this.noJumpDelay = 0;
diff --git a/src/main/java/net/minecraft/world/entity/animal/Panda.java b/src/main/java/net/minecraft/world/entity/animal/Panda.java
index 943a8d7c137feffcb1b06d7ddb4cb26378094675..a0cf2f28400bce6246c02e2fbe0d69bc6f7d46e2 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Panda.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Panda.java
@@ -515,7 +515,9 @@ public class Panda extends Animal {
             Panda entitypanda = (Panda) iterator.next();
 
             if (!entitypanda.isBaby() && entitypanda.onGround && !entitypanda.isInWater() && entitypanda.canPerformAction()) {
+                if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper
                 entitypanda.jumpFromGround();
+                } 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 fb0e0c629d16bc97efc3e91f7ba6fe9e87fc950b..be1540b0a5f95f8a85f91d5fe398cd2cf8832ec4 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -824,5 +824,19 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
     public org.bukkit.inventory.EquipmentSlot getHandRaised() {
         return getHandle().getUsedItemHand() == net.minecraft.world.InteractionHand.MAIN_HAND ? org.bukkit.inventory.EquipmentSlot.HAND : org.bukkit.inventory.EquipmentSlot.OFF_HAND;
     }
+
+    @Override
+    public boolean isJumping() {
+        return getHandle().jumping;
+    }
+
+    @Override
+    public void setJumping(boolean jumping) {
+        getHandle().setJumping(jumping);
+        if (jumping && getHandle() instanceof Mob) {
+            // this is needed to actually make a mob jump
+            ((Mob) getHandle()).getJumpControl().jump();
+        }
+    }
     // Paper end
 }