Improve hands & pulling (#4389)

Content.Client/Items/ItemStatusMessages.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using Robust.Client.UserInterface;
+using Robust.Shared.GameObjects;
+
+namespace Content.Client.Items
+{
+    public sealed class ItemStatusCollectMessage : EntityEventArgs
+    {
+        public List<Control> Controls = new();
+    }
+
+    public static class ItemStatusRegisterExt
+    {
+        /// <summary>
+        /// Register an item status control for a component.
+        /// </summary>
+        /// <param name="subs">The <see cref="EntitySystem.Subs"/> handle from within entity system initialize.</param>
+        /// <param name="createControl">A delegate to create the actual control.</param>
+        /// <typeparam name="TComp">The type of component for which this control should be made.</typeparam>
+        public static void ItemStatus<TComp>(
+            this EntitySystem.Subscriptions subs,
+            Func<EntityUid, Control> createControl)
+            where TComp : IComponent
+        {
+            subs.SubscribeLocalEvent<TComp, ItemStatusCollectMessage>((uid, _, args) =>
+            {
+                args.Controls.Add(createControl(uid));
+            });
+        }
+    }
+}