Initial interop

Multiselect/MultiSelectController.cs

@@ -0,0 +1,31 @@
+using EFT.InventoryLogic;
+using EFT.UI;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace UIFixes;
+
+// This class exists to create a layer between MultiSelectInterop and the MultiSelect implementation.
+public static class MultiSelectController
+{
+    public static int GetCount()
+    {
+        return MultiSelect.Count;
+    }
+
+    public static IEnumerable<Item> GetItems()
+    {
+        return MultiSelect.SortedItemContexts().Select(ic => ic.Item);
+    }
+
+    public static Task Apply(Func<Item, Task> func, ItemUiContext itemUiContext = null)
+    {
+        itemUiContext ??= ItemUiContext.Instance;
+        var taskSerializer = itemUiContext.gameObject.AddComponent<ItemTaskSerializer>();
+        return taskSerializer.Initialize(GetItems(), func);
+    }
+}
+
+public class ItemTaskSerializer : TaskSerializer<Item> { }