From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jakub Zacek <dawon@dawon.eu>
Date: Sun, 24 Apr 2022 22:56:59 +0200
Subject: [PATCH] Add PlayerInventorySlotChangeEvent


diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index 0f7a07a22ee1db3fd96c06ce7248d9d5392bd14f..046f7f73a6b1673d0736c49b5d0fb09b6eb6d91d 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -381,6 +381,25 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player {
 
                 }
             }
+            // Paper start - Add PlayerInventorySlotChangeEvent
+            @Override
+            public void slotChanged(AbstractContainerMenu handler, int slotId, ItemStack oldStack, ItemStack stack) {
+                Slot slot = handler.getSlot(slotId);
+                if (!(slot instanceof ResultSlot)) {
+                    if (slot.container == ServerPlayer.this.getInventory()) {
+                        if (io.papermc.paper.event.player.PlayerInventorySlotChangeEvent.getHandlerList().getRegisteredListeners().length == 0) {
+                            CriteriaTriggers.INVENTORY_CHANGED.trigger(ServerPlayer.this, ServerPlayer.this.getInventory(), stack);
+                            return;
+                        }
+                        io.papermc.paper.event.player.PlayerInventorySlotChangeEvent event = new io.papermc.paper.event.player.PlayerInventorySlotChangeEvent(ServerPlayer.this.getBukkitEntity(), slotId, CraftItemStack.asBukkitCopy(oldStack), CraftItemStack.asBukkitCopy(stack));
+                        event.callEvent();
+                        if (event.shouldTriggerAdvancements()) {
+                            CriteriaTriggers.INVENTORY_CHANGED.trigger(ServerPlayer.this, ServerPlayer.this.getInventory(), stack);
+                        }
+                    }
+                }
+            }
+            // Paper end - Add PlayerInventorySlotChangeEvent
 
             @Override
             public void dataChanged(AbstractContainerMenu handler, int property, int value) {}
diff --git a/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java b/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
index 3b92fb173f623a05ae99c86d98f2ecdf907f58c4..d830504d08c9de92797c432a868c1ee9dfc46a91 100644
--- a/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
@@ -330,7 +330,7 @@ public abstract class AbstractContainerMenu {
             while (iterator.hasNext()) {
                 ContainerListener icrafting = (ContainerListener) iterator.next();
 
-                icrafting.slotChanged(this, slot, itemstack2);
+                icrafting.slotChanged(this, slot, itemstack1, itemstack2); // Paper - Add PlayerInventorySlotChangeEvent
             }
         }
 
diff --git a/src/main/java/net/minecraft/world/inventory/ContainerListener.java b/src/main/java/net/minecraft/world/inventory/ContainerListener.java
index 0e19cc55646625bf32a354d3df2dc2d6bcff96f4..eba024c9aadef8902aacccea1584ffbee6c04e44 100644
--- a/src/main/java/net/minecraft/world/inventory/ContainerListener.java
+++ b/src/main/java/net/minecraft/world/inventory/ContainerListener.java
@@ -5,5 +5,11 @@ import net.minecraft.world.item.ItemStack;
 public interface ContainerListener {
     void slotChanged(AbstractContainerMenu handler, int slotId, ItemStack stack);
 
+    // Paper start - Add PlayerInventorySlotChangeEvent
+    default void slotChanged(AbstractContainerMenu handler, int slotId, ItemStack oldStack, ItemStack stack) {
+        slotChanged(handler, slotId, stack);
+    }
+    // Paper end - Add PlayerInventorySlotChangeEvent
+
     void dataChanged(AbstractContainerMenu handler, int property, int value);
 }