From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Madeline Miller <mnmiller1@me.com>
Date: Sun, 17 Jan 2021 13:16:09 +1000
Subject: [PATCH] Add BlockPreDispenseEvent


diff --git a/src/main/java/net/minecraft/world/level/block/DispenserBlock.java b/src/main/java/net/minecraft/world/level/block/DispenserBlock.java
index f4853a5ff8a45efcda2d7781c1fa897c47d8ea46..a02f24448b002824b068278fa427003008c0d0f1 100644
--- a/src/main/java/net/minecraft/world/level/block/DispenserBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/DispenserBlock.java
@@ -107,6 +107,7 @@ public class DispenserBlock extends BaseEntityBlock {
                 DispenseItemBehavior idispensebehavior = this.getDispenseMethod(world, itemstack);
 
                 if (idispensebehavior != DispenseItemBehavior.NOOP) {
+                    if (!org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockPreDispenseEvent(world, pos, itemstack, i)) return; // Paper - Add BlockPreDispenseEvent
                     DispenserBlock.eventFired = false; // CraftBukkit - reset event status
                     tileentitydispenser.setItem(i, idispensebehavior.dispense(sourceblock, itemstack));
                 }
diff --git a/src/main/java/net/minecraft/world/level/block/DropperBlock.java b/src/main/java/net/minecraft/world/level/block/DropperBlock.java
index 91b514967405115f22edf4255775361a672e5c2f..ddecf443df3679e3098eb54edd19585a0512e342 100644
--- a/src/main/java/net/minecraft/world/level/block/DropperBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/DropperBlock.java
@@ -71,6 +71,7 @@ public class DropperBlock extends DispenserBlock {
                     ItemStack itemstack1;
 
                     if (iinventory == null) {
+                        if (!org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockPreDispenseEvent(world, pos, itemstack, i)) return; // Paper - Add BlockPreDispenseEvent
                         itemstack1 = DropperBlock.DISPENSE_BEHAVIOUR.dispense(sourceblock, itemstack);
                     } else {
                         // CraftBukkit start - Fire event when pushing items into other inventories
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 696867479e74c3c94e4131f2bbb97c857ed5e9dd..6d1d3451054af05e2381d70d71b99869f37c0901 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -2132,5 +2132,11 @@ public class CraftEventFactory {
         io.papermc.paper.event.block.BlockFailedDispenseEvent event = new io.papermc.paper.event.block.BlockFailedDispenseEvent(block);
         return event.callEvent();
     }
+
+    public static boolean handleBlockPreDispenseEvent(ServerLevel serverLevel, BlockPos pos, ItemStack itemStack, int slot) {
+        org.bukkit.block.Block block = CraftBlock.at(serverLevel, pos);
+        io.papermc.paper.event.block.BlockPreDispenseEvent event = new io.papermc.paper.event.block.BlockPreDispenseEvent(block, org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemStack), slot);
+        return event.callEvent();
+    }
     // Paper end
 }