diff --git a/SpigotCore_Main/src/de/steamwar/inventory/SWInventory.java b/SpigotCore_Main/src/de/steamwar/inventory/SWInventory.java
index 7de1c87..be75f28 100644
--- a/SpigotCore_Main/src/de/steamwar/inventory/SWInventory.java
+++ b/SpigotCore_Main/src/de/steamwar/inventory/SWInventory.java
@@ -30,35 +30,54 @@ import org.bukkit.event.inventory.InventoryCloseEvent;
 import org.bukkit.inventory.Inventory;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
 
 public class SWInventory implements Listener {
 
     final Player player;
-    final Map<Integer, InvCallback> callbacks = new HashMap<>();
+    final Map<Integer, Consumer<InventoryClickEvent>> callbacks = new HashMap<>();
     final Inventory inventory;
+    boolean open = false;
 
-    public SWInventory(Player p, int size, String t){
+    public SWInventory(Player p, int size, String t) {
         player = p;
         inventory = Bukkit.createInventory(p, size, t);
     }
 
-    public SWInventory(Player p, int size, String t, Map<Integer, SWItem> items){
+    public SWInventory(Player p, int size, String t, Map<Integer, SWItem> items) {
         this(p, size, t);
         items.forEach(this::setItem);
         open();
     }
 
-    public void addCloseCallback(InvCallback c){
-        callbacks.put(-1, c);
+    public SWInventory(Player p, Supplier<Inventory> inventoryConstructor) {
+        player = p;
+        try {
+            inventory = inventoryConstructor.get();
+        } catch (Exception e) {
+            throw new SecurityException("Could not construct inventory", e);
+        }
     }
 
-    public void setItem(int pos, ItemStack itemStack, InvCallback c){
+    public void addCloseCallback(InvCallback c) {
+        callbacks.put(-1, inventoryClickEvent -> c.clicked(null));
+    }
+
+    public void addCloseRunable(Runnable c) {
+        callbacks.put(-1, inventoryClickEvent -> c.run());
+    }
+
+    public void setItem(int pos, ItemStack itemStack, InvCallback c) {
         inventory.setItem(pos, itemStack);
-        callbacks.put(pos, c);
+        callbacks.put(pos, inventoryClickEvent -> c.clicked(inventoryClickEvent.getClick()));
     }
 
-    public void setItem(int pos, SWItem item){
+    public void setItem(int pos, SWItem item) {
         setItem(pos, item.getItemStack(), item.getCallback());
     }
 
@@ -70,32 +89,63 @@ public class SWInventory implements Listener {
         setItem(pos, m, meta, name, new ArrayList<>(), false, c);
     }
 
-    public void setItem(int pos, Material m, String name, List<String> lore, boolean e, InvCallback c){
-        setItem(pos, m, (byte)0, name, lore, e, c);
+    public void setItem(int pos, Material m, String name, List<String> lore, boolean e, InvCallback c) {
+        setItem(pos, m, (byte) 0, name, lore, e, c);
     }
 
-    public void setItem(int pos, Material m, byte meta, String name, List<String> lore, boolean e, InvCallback c){
+    public void setItem(int pos, Material m, byte meta, String name, List<String> lore, boolean e, InvCallback c) {
         SWItem item = new SWItem(m, meta, name, lore, e, c);
         setItem(pos, item);
     }
 
-    public void setCallback(int pos, InvCallback c){
+    public void setCallback(int pos, InvCallback c) {
+        callbacks.put(pos, inventoryClickEvent -> c.clicked(inventoryClickEvent.getClick()));
+    }
+
+    public void setItemEvent(int pos, ItemStack itemStack, Consumer<InventoryClickEvent> c) {
+        inventory.setItem(pos, itemStack);
         callbacks.put(pos, c);
     }
 
-    public void open(){
+    public void setItemEvent(int pos, Material m, String name, Consumer<InventoryClickEvent> c) {
+        setItemEvent(pos, m, name, new ArrayList<>(), false, c);
+    }
+
+    public void setItemEvent(int pos, Material m, byte meta, String name, Consumer<InventoryClickEvent> c) {
+        setItemEvent(pos, m, meta, name, new ArrayList<>(), false, c);
+    }
+
+    public void setItemEvent(int pos, Material m, String name, List<String> lore, boolean e, Consumer<InventoryClickEvent> c) {
+        setItemEvent(pos, m, (byte) 0, name, lore, e, c);
+    }
+
+    public void setItemEvent(int pos, Material m, byte meta, String name, List<String> lore, boolean e, Consumer<InventoryClickEvent> c) {
+        SWItem item = new SWItem(m, meta, name, lore, e, click -> {
+        });
+        setItem(pos, item);
+        setEventCallback(pos, c);
+    }
+
+    public void setEventCallback(int pos, Consumer<InventoryClickEvent> c) {
+        callbacks.put(pos, c);
+    }
+
+    public void open() {
         player.openInventory(inventory);
-        Bukkit.getPluginManager().registerEvents(this, Core.getInstance());
+        if(!open) {
+            Bukkit.getPluginManager().registerEvents(this, Core.getInstance());
+            open = true;
+        }
     }
 
     @EventHandler
-    public void onInventoryClick(InventoryClickEvent e){
-        if(!player.equals(e.getWhoClicked()))
+    public void onInventoryClick(InventoryClickEvent e) {
+        if (!player.equals(e.getWhoClicked()))
             return;
 
-        if(callbacks.containsKey(e.getRawSlot()) && callbacks.get(e.getRawSlot()) != null) {
+        if (callbacks.containsKey(e.getRawSlot()) && callbacks.get(e.getRawSlot()) != null) {
             e.setCancelled(true);
-            callbacks.get(e.getRawSlot()).clicked(e.getClick());
+            callbacks.get(e.getRawSlot()).accept(e);
         }
     }
 
@@ -107,6 +157,6 @@ public class SWInventory implements Listener {
         InventoryClickEvent.getHandlerList().unregister(this);
         InventoryCloseEvent.getHandlerList().unregister(this);
         if(callbacks.containsKey(-1))
-            callbacks.get(-1).clicked(null);
+            callbacks.get(-1).accept(null);
     }
 }