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Paper/patches/server/0511-Add-PlayerTradeEvent-and-PlayerPurchaseEvent.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 2 Jul 2020 16:12:10 -0700
Subject: [PATCH] Add PlayerTradeEvent and PlayerPurchaseEvent
Co-authored-by: Alexander <protonull@protonmail.com>
diff --git a/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java b/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
index fe003c42f002e229111c46a79ac6a961c60db912..564908ce0a560c2190fb624e77d227d3b7031024 100644
--- a/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
+++ b/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
@@ -138,11 +138,24 @@ public abstract class AbstractVillager extends AgeableMob implements InventoryCa
@Override
public void overrideXp(int experience) {}
+ // Paper start
+ @Override
+ public void processTrade(MerchantOffer recipe, @Nullable io.papermc.paper.event.player.PlayerPurchaseEvent event) { // The MerchantRecipe passed in here is the one set by the PlayerPurchaseEvent
+ if (event == null || event.willIncreaseTradeUses()) {
+ recipe.increaseUses();
+ }
+ if (event == null || event.isRewardingExp()) {
+ this.rewardTradeXp(recipe);
+ }
+ this.notifyTrade(recipe);
+ }
+ // Paper end
+
@Override
public void notifyTrade(MerchantOffer offer) {
- offer.increaseUses();
+ // offer.increaseUses(); // Paper - handled in processTrade
this.ambientSoundTime = -this.getAmbientSoundInterval();
- this.rewardTradeXp(offer);
+ // this.rewardTradeXp(offer); // Paper - handled in processTrade
if (this.tradingPlayer instanceof ServerPlayer) {
CriteriaTriggers.TRADE.trigger((ServerPlayer) this.tradingPlayer, this, offer.getResult());
}
diff --git a/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java b/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
index 85a6bc46817c7272855a7f3aa8c206d7b3f8512e..4ac91ba7dc754b120189fd32d24076d51b17d7c6 100644
--- a/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
@@ -756,6 +756,14 @@ public abstract class AbstractContainerMenu {
public abstract boolean stillValid(Player player);
protected boolean moveItemStackTo(ItemStack stack, int startIndex, int endIndex, boolean fromLast) {
+ // Paper start
+ return this.moveItemStackTo(stack, startIndex, endIndex, fromLast, false);
+ }
+ protected boolean moveItemStackTo(ItemStack stack, int startIndex, int endIndex, boolean fromLast, boolean isCheck) {
+ if (isCheck) {
+ stack = stack.copy();
+ }
+ // Paper end
boolean flag1 = false;
int k = startIndex;
@@ -778,18 +786,27 @@ public abstract class AbstractContainerMenu {
slot = (Slot) this.slots.get(k);
itemstack1 = slot.getItem();
+ // Paper start - clone if only a check
+ if (isCheck) {
+ itemstack1 = itemstack1.copy();
+ }
+ // Paper end
if (!itemstack1.isEmpty() && ItemStack.isSameItemSameTags(stack, itemstack1)) {
int l = itemstack1.getCount() + stack.getCount();
if (l <= stack.getMaxStackSize()) {
stack.setCount(0);
itemstack1.setCount(l);
+ if (!isCheck) { // Paper - dont update if only a check
slot.setChanged();
+ } // Paper
flag1 = true;
} else if (itemstack1.getCount() < stack.getMaxStackSize()) {
stack.shrink(stack.getMaxStackSize() - itemstack1.getCount());
itemstack1.setCount(stack.getMaxStackSize());
+ if (!isCheck) { // Paper - dont update if only a check
slot.setChanged();
+ } // Paper
flag1 = true;
}
}
@@ -820,14 +837,33 @@ public abstract class AbstractContainerMenu {
slot = (Slot) this.slots.get(k);
itemstack1 = slot.getItem();
+ // Paper start - clone if only a check
+ if (isCheck) {
+ itemstack1 = itemstack1.copy();
+ }
+ // Paper end
if (itemstack1.isEmpty() && slot.mayPlace(stack)) {
if (stack.getCount() > slot.getMaxStackSize()) {
+ // Paper start - dont set slot if only check
+ if (isCheck) {
+ stack.shrink(slot.getMaxStackSize());
+ } else {
+ // Paper end
slot.setByPlayer(stack.split(slot.getMaxStackSize()));
+ } // Paper
} else {
+ // Paper start - dont set slot if only check
+ if (isCheck) {
+ stack.shrink(stack.getCount());
+ } else {
+ // Paper end
slot.setByPlayer(stack.split(stack.getCount()));
+ } // Paper
}
+ if (!isCheck) { // Paper - dont update if only check
slot.setChanged();
+ } // Paper
flag1 = true;
break;
}
diff --git a/src/main/java/net/minecraft/world/inventory/MerchantMenu.java b/src/main/java/net/minecraft/world/inventory/MerchantMenu.java
index 743a2adc465be5477d204185967265389d7102de..8eab7596e1f7d1beb9ab0d70d1310d26822262e9 100644
--- a/src/main/java/net/minecraft/world/inventory/MerchantMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/MerchantMenu.java
@@ -134,12 +134,12 @@ public class MerchantMenu extends AbstractContainerMenu {
itemstack = itemstack1.copy();
if (slot == 2) {
- if (!this.moveItemStackTo(itemstack1, 3, 39, true)) {
+ if (!this.moveItemStackTo(itemstack1, 3, 39, true, true)) { // Paper
return ItemStack.EMPTY;
}
- slot1.onQuickCraft(itemstack1, itemstack);
- this.playTradeSound();
+ // slot1.onQuickCraft(itemstack1, itemstack); // Paper - moved to after the non-check moveItemStackTo call
+ // this.playTradeSound();
} else if (slot != 0 && slot != 1) {
if (slot >= 3 && slot < 30) {
if (!this.moveItemStackTo(itemstack1, 30, 39, false)) {
@@ -152,6 +152,7 @@ public class MerchantMenu extends AbstractContainerMenu {
return ItemStack.EMPTY;
}
+ if (slot != 2) { // Paper - moved down for slot 2
if (itemstack1.isEmpty()) {
slot1.setByPlayer(ItemStack.EMPTY);
} else {
@@ -163,6 +164,21 @@ public class MerchantMenu extends AbstractContainerMenu {
}
slot1.onTake(player, itemstack1);
+ } // Paper start - handle slot 2
+ if (slot == 2) { // is merchant result slot
+ slot1.onTake(player, itemstack1);
+ if (itemstack1.isEmpty()) {
+ slot1.set(ItemStack.EMPTY);
+ return ItemStack.EMPTY;
+ }
+
+ this.moveItemStackTo(itemstack1, 3, 39, true, false); // This should always succeed because it's checked above
+
+ slot1.onQuickCraft(itemstack1, itemstack);
+ this.playTradeSound();
+ slot1.set(ItemStack.EMPTY); // itemstack1 should ALWAYS be empty
+ }
+ // Paper end
}
return itemstack;
diff --git a/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java b/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java
index e49bbb803399ef696665c5844a18b55a551654f6..1f2b9a9a3fa167e2ba021c823dd142b0bb18a695 100644
--- a/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java
+++ b/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java
@@ -47,13 +47,32 @@ public class MerchantResultSlot extends Slot {
@Override
public void onTake(Player player, ItemStack stack) {
- this.checkTakeAchievements(stack);
+ // this.checkTakeAchievements(stack); // Paper - move to after event is called and not cancelled
MerchantOffer merchantOffer = this.slots.getActiveOffer();
+ // Paper start
+ io.papermc.paper.event.player.PlayerPurchaseEvent event = null;
+ if (merchantOffer != null && player instanceof net.minecraft.server.level.ServerPlayer serverPlayer) {
+ if (this.merchant instanceof net.minecraft.world.entity.npc.AbstractVillager abstractVillager) {
+ event = new io.papermc.paper.event.player.PlayerTradeEvent(serverPlayer.getBukkitEntity(), (org.bukkit.entity.AbstractVillager) abstractVillager.getBukkitEntity(), merchantOffer.asBukkit(), true, true);
+ } else if (this.merchant instanceof org.bukkit.craftbukkit.inventory.CraftMerchantCustom.MinecraftMerchant) {
+ event = new io.papermc.paper.event.player.PlayerPurchaseEvent(serverPlayer.getBukkitEntity(), merchantOffer.asBukkit(), false, true);
+ }
+ if (event != null) {
+ if (!event.callEvent()) {
+ stack.setCount(0);
+ event.getPlayer().updateInventory();
+ return;
+ }
+ merchantOffer = org.bukkit.craftbukkit.inventory.CraftMerchantRecipe.fromBukkit(event.getTrade()).toMinecraft();
+ }
+ }
+ this.checkTakeAchievements(stack);
+ // Paper end
if (merchantOffer != null) {
ItemStack itemStack = this.slots.getItem(0);
ItemStack itemStack2 = this.slots.getItem(1);
if (merchantOffer.take(itemStack, itemStack2) || merchantOffer.take(itemStack2, itemStack)) {
- this.merchant.notifyTrade(merchantOffer);
+ this.merchant.processTrade(merchantOffer, event); // Paper
player.awardStat(Stats.TRADED_WITH_VILLAGER);
this.slots.setItem(0, itemStack);
this.slots.setItem(1, itemStack2);
diff --git a/src/main/java/net/minecraft/world/item/trading/Merchant.java b/src/main/java/net/minecraft/world/item/trading/Merchant.java
index d41f44ed2e497ba3373d170c08488b49e88334c4..d3a99ba6f3085ad12b67ddc94cc4ab393ec7ecbe 100644
--- a/src/main/java/net/minecraft/world/item/trading/Merchant.java
+++ b/src/main/java/net/minecraft/world/item/trading/Merchant.java
@@ -20,6 +20,7 @@ public interface Merchant {
void overrideOffers(MerchantOffers offers);
+ default void processTrade(MerchantOffer merchantRecipe, @Nullable io.papermc.paper.event.player.PlayerPurchaseEvent event) { this.notifyTrade(merchantRecipe); } // Paper
void notifyTrade(MerchantOffer offer);
void notifyTradeUpdated(ItemStack stack);
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
index adf22ce4f0bcd3bd57dc2030c6c92d3df96566e3..05af1f1cfb38e4ae4ea0ecc2d0a943cbc4063c77 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
@@ -74,10 +74,25 @@ public class CraftMerchantCustom extends CraftMerchant {
return this.trades;
}
+ // Paper start
+ @Override
+ public void processTrade(MerchantOffer merchantRecipe, @javax.annotation.Nullable io.papermc.paper.event.player.PlayerPurchaseEvent event) { // The MerchantRecipe passed in here is the one set by the PlayerPurchaseEvent
+ /** Based on {@link net.minecraft.world.entity.npc.AbstractVillager#processTrade(MerchantOffer, io.papermc.paper.event.player.PlayerPurchaseEvent)} */
+ if (getTradingPlayer() instanceof net.minecraft.server.level.ServerPlayer) {
+ if (event == null || event.willIncreaseTradeUses()) {
+ merchantRecipe.increaseUses();
+ }
+ if (event == null || event.isRewardingExp()) {
+ this.tradingPlayer.level().addFreshEntity(new net.minecraft.world.entity.ExperienceOrb(this.tradingPlayer.level(), this.tradingPlayer.getX(), this.tradingPlayer.getY(), this.tradingPlayer.getZ(), merchantRecipe.getXp(), org.bukkit.entity.ExperienceOrb.SpawnReason.VILLAGER_TRADE, this.tradingPlayer, null));
+ }
+ }
+ this.notifyTrade(merchantRecipe);
+ }
+ // Paper end
@Override
public void notifyTrade(MerchantOffer offer) {
// increase recipe's uses
- offer.increaseUses();
+ // offer.increaseUses(); // Paper - handled above in processTrade
}
@Override
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