[ci skip] Introduce item as an additional context (#189)

* Introduce item as an additional context

* Remove @Internal

common/src/main/java/dev/architectury/event/events/client/ClientTooltipEvent.java

@@ -23,12 +23,15 @@ import com.mojang.blaze3d.vertex.PoseStack;
 import dev.architectury.event.Event;
 import dev.architectury.event.EventFactory;
 import dev.architectury.event.EventResult;
+import dev.architectury.impl.TooltipAdditionalContextsImpl;
 import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
 import net.minecraft.client.gui.screens.inventory.tooltip.ClientTooltipComponent;
 import net.minecraft.network.chat.Component;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.TooltipFlag;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 
@@ -51,6 +54,18 @@ public interface ClientTooltipEvent {
      */
     Event<RenderModifyColor> RENDER_MODIFY_COLOR = EventFactory.createLoop();
     
+    static AdditionalContexts additionalContexts() {
+        return TooltipAdditionalContextsImpl.get();
+    }
+    
+    @ApiStatus.NonExtendable
+    interface AdditionalContexts {
+        @Nullable
+        ItemStack getItem();
+        
+        void setItem(@Nullable ItemStack stack);
+    }
+    
     @Environment(EnvType.CLIENT)
     interface Item {
         /**

common/src/main/java/dev/architectury/impl/TooltipAdditionalContextsImpl.java

@@ -0,0 +1,46 @@
+/*
+ * This file is part of architectury.
+ * Copyright (C) 2020, 2021, 2022 architectury
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package dev.architectury.impl;
+
+import dev.architectury.event.events.client.ClientTooltipEvent;
+import net.minecraft.world.item.ItemStack;
+import org.jetbrains.annotations.Nullable;
+
+public class TooltipAdditionalContextsImpl implements ClientTooltipEvent.AdditionalContexts {
+    private static final ThreadLocal<TooltipAdditionalContextsImpl> INSTANCE_LOCAL = ThreadLocal.withInitial(TooltipAdditionalContextsImpl::new);
+    
+    public static ClientTooltipEvent.AdditionalContexts get() {
+        return INSTANCE_LOCAL.get();
+    }
+    
+    @Nullable
+    private ItemStack item;
+    
+    @Override
+    @Nullable
+    public ItemStack getItem() {
+        return item;
+    }
+    
+    @Override
+    public void setItem(@Nullable ItemStack item) {
+        this.item = item;
+    }
+}