add handler.setInventoryCreator method

Author: J4C0B3Y

core/src/main/java/net/j4c0b3y/api/menu/Menu.java

@@ -9,7 +9,6 @@
 import net.j4c0b3y.api.menu.layer.impl.ForegroundLayer;
 import net.j4c0b3y.api.menu.template.Template;
 import net.j4c0b3y.api.menu.utils.Position;
-import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
 import org.bukkit.event.inventory.InventoryClickEvent;
 import org.bukkit.inventory.Inventory;
@@ -111,7 +110,7 @@ public Menu(String title, MenuSize size, Player player, MenuHandler handler) {
             throw new IllegalStateException("No menu handler instance found.");
         }
 
-        this.inventory = Bukkit.createInventory(player, getTotalSlots(), this.title);
+        this.inventory = handler.getInventoryCreator().apply(player, getTotalSlots(), this.title);
         this.async = getClass().isAnnotationPresent(Async.class);
     }
 

core/src/main/java/net/j4c0b3y/api/menu/MenuHandler.java

@@ -5,8 +5,10 @@
 import lombok.Setter;
 import net.j4c0b3y.api.menu.listener.InventoryListener;
 import net.j4c0b3y.api.menu.task.AutoUpdateTask;
+import net.j4c0b3y.api.menu.utils.TriFunction;
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
+import org.bukkit.inventory.Inventory;
 import org.bukkit.plugin.java.JavaPlugin;
 
 import java.util.Map;
@@ -56,6 +58,12 @@ public class MenuHandler {
      */
     @Setter private boolean closeOnBack = false;
 
+    /**
+     * The method to use when creating internal menu inventories.
+     */
+    @Setter private TriFunction<Player, Integer, String, Inventory> inventoryCreator =
+        Bukkit::createInventory;
+
     /**
      * Creates a new menu handler, starting the autoupdating
      * task and registering inventory and connection listeners.

core/src/main/java/net/j4c0b3y/api/menu/utils/TriFunction.java

@@ -0,0 +1,11 @@
+package net.j4c0b3y.api.menu.utils;
+
+/**
+ * @author J4C0B3Y
+ * @version MenuAPI
+ * @since 7/08/2025
+ */
+@FunctionalInterface
+public interface TriFunction<F, S, T, R> {
+    R apply(F first, S second, T third);
+}