Paper/patches/server/1004-Add-PlayerPickItemEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: RodneyMKay <36546810+RodneyMKay@users.noreply.github.com>
Date: Wed, 8 Sep 2021 21:34:01 +0200
Subject: [PATCH] Add PlayerPickItemEvent


diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 0a1d77ff0e29cee7d85eab02fb6f1e0578f32493..72db2078e73c4384ee163c479ca56d6e50fc2f40 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -942,7 +942,14 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
             this.disconnect("Invalid hotbar selection (Hacking?)", org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_ACTION); // Paper - kick event cause
             return;
         }
-        this.player.getInventory().pickSlot(packet.getSlot()); // Paper - Diff above if changed
+        Player bukkitPlayer = this.player.getBukkitEntity();
+        int targetSlot = this.player.getInventory().getSuitableHotbarSlot();
+        int sourceSlot = packet.getSlot();
+
+        io.papermc.paper.event.player.PlayerPickItemEvent event = new io.papermc.paper.event.player.PlayerPickItemEvent(bukkitPlayer, targetSlot, sourceSlot);
+        if (!event.callEvent()) return;
+
+        this.player.getInventory().pickSlot(event.getSourceSlot(), event.getTargetSlot());
         // Paper end
         this.player.connection.send(new ClientboundContainerSetSlotPacket(-2, 0, this.player.getInventory().selected, this.player.getInventory().getItem(this.player.getInventory().selected)));
         this.player.connection.send(new ClientboundContainerSetSlotPacket(-2, 0, packet.getSlot(), this.player.getInventory().getItem(packet.getSlot())));
diff --git a/src/main/java/net/minecraft/world/entity/player/Inventory.java b/src/main/java/net/minecraft/world/entity/player/Inventory.java
index 395cecc385e4126a7534ac9aeb15cf323efab03e..96d664c28738d6090f7067761c2978dd1aa0fd0e 100644
--- a/src/main/java/net/minecraft/world/entity/player/Inventory.java
+++ b/src/main/java/net/minecraft/world/entity/player/Inventory.java
@@ -174,7 +174,13 @@ public class Inventory implements Container, Nameable {
     }
 
     public void pickSlot(int slot) {
-        this.selected = this.getSuitableHotbarSlot();
+        // Paper start - Add PlayerPickItemEvent
+        pickSlot(slot, this.getSuitableHotbarSlot());
+    }
+
+    public void pickSlot(int slot, int targetSlot) {
+        this.selected = targetSlot;
+        // Paper end
         ItemStack itemstack = (ItemStack) this.items.get(this.selected);
 
         this.items.set(this.selected, (ItemStack) this.items.get(slot));