From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Wed, 25 Nov 2020 16:33:27 -0800
Subject: [PATCH] Added PlayerLoomPatternSelectEvent


diff --git a/src/main/java/net/minecraft/world/inventory/LoomMenu.java b/src/main/java/net/minecraft/world/inventory/LoomMenu.java
index 757ee83a0ec5d381eb328f31f3bef636a9b72d57..e28c1cdf4763e9db3e29b3c0f08d65f978017931 100644
--- a/src/main/java/net/minecraft/world/inventory/LoomMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/LoomMenu.java
@@ -173,8 +173,35 @@ public class LoomMenu extends AbstractContainerMenu {
     @Override
     public boolean clickMenuButton(net.minecraft.world.entity.player.Player player, int id) {
         if (id >= 0 && id < this.selectablePatterns.size()) {
-            this.selectedBannerPatternIndex.set(id);
-            this.setupResultSlot((Holder) this.selectablePatterns.get(id));
+            // Paper start
+            int selectablePatternIndex = id;
+            io.papermc.paper.event.player.PlayerLoomPatternSelectEvent event = new io.papermc.paper.event.player.PlayerLoomPatternSelectEvent((Player) player.getBukkitEntity(), ((CraftInventoryLoom) getBukkitView().getTopInventory()), org.bukkit.block.banner.PatternType.getByIdentifier(this.selectablePatterns.get(selectablePatternIndex).value().getHashname()));
+            if (!event.callEvent()) {
+                ((Player) player.getBukkitEntity()).updateInventory();
+                return false;
+            }
+            Holder<BannerPattern> selectedPattern = null;
+            for (int i = 0; i < this.selectablePatterns.size(); i++) {
+                final Holder<BannerPattern> holder = this.selectablePatterns.get(i);
+                if (event.getPatternType().getIdentifier().equals(holder.value().getHashname())) {
+                    selectablePatternIndex = i;
+                    selectedPattern = holder;
+                    break;
+                }
+            }
+            if (selectedPattern == null) {
+                for (BannerPattern pattern : BuiltInRegistries.BANNER_PATTERN) {
+                    if (event.getPatternType().getIdentifier().equals(pattern.getHashname())) {
+                        selectedPattern = BuiltInRegistries.BANNER_PATTERN.getHolder(BuiltInRegistries.BANNER_PATTERN.getId(pattern)).orElseThrow();
+                        break;
+                    }
+                }
+                selectablePatternIndex = -1;
+            }
+            ((Player) player.getBukkitEntity()).updateInventory();
+            this.selectedBannerPatternIndex.set(selectablePatternIndex);
+            this.setupResultSlot(java.util.Objects.requireNonNull(selectedPattern, "selectedPattern was null, this is unexpected"));
+            // Paper end
             return true;
         } else {
             return false;