New extendable mechanism for disabling units

OpenRa.Mods.RA/RequiresPower.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using OpenRa.Traits;
+
+namespace OpenRa.Mods.RA
+{
+	class RequiresPowerInfo : ITraitInfo
+	{
+		public object Create(Actor self) { return new RequiresPower(self); }
+	}
+
+	class RequiresPower : IDisable
+	{
+		readonly Actor self;
+		public RequiresPower( Actor self )
+		{
+			this.self = self;
+		}
+
+		public bool Disabled
+		{
+			get	{ return (self.Owner.GetPowerState() != PowerState.Normal);	}
+			set {} // Cannot explicity set
+		}
+	}
+}