Re-organize all projects (#4166)

Content.Shared/Hands/IHandSelected.cs

@@ -0,0 +1,51 @@
+#nullable enable
+using System;
+using JetBrains.Annotations;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+
+namespace Content.Shared.Hands
+{
+    /// <summary>
+    ///     This interface gives components behavior when they're held on the selected hand.
+    /// </summary>
+    [RequiresExplicitImplementation]
+    public interface IHandSelected
+    {
+        [Obsolete("Use HandSelectedMessage instead")]
+        void HandSelected(HandSelectedEventArgs eventArgs);
+    }
+
+    public class HandSelectedEventArgs : EventArgs
+    {
+        public HandSelectedEventArgs(IEntity user)
+        {
+            User = user;
+        }
+
+        public IEntity User { get; }
+    }
+
+    /// <summary>
+    ///     Raised when an item entity held by a hand is selected.
+    /// </summary>
+    [PublicAPI]
+    public class HandSelectedEvent : HandledEntityEventArgs
+    {
+        /// <summary>
+        ///     Entity that owns the selected hand.
+        /// </summary>
+        public IEntity User { get; }
+
+        /// <summary>
+        ///     Item in the hand that was selected.
+        /// </summary>
+        public IEntity Item { get; }
+
+        public HandSelectedEvent(IEntity user, IEntity item)
+        {
+            User = user;
+            Item = item;
+        }
+    }
+}