categorize traits better

OpenRa.Game/Traits/Player/PlaceBuilding.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.GameRules;
+
+namespace OpenRa.Traits
+{
+	class PlaceBuildingInfo : StatelessTraitInfo<PlaceBuilding> { }
+
+	class PlaceBuilding : IResolveOrder
+	{
+		public void ResolveOrder( Actor self, Order order )
+		{
+			if( order.OrderString == "PlaceBuilding" )
+			{
+				self.World.AddFrameEndTask( _ =>
+				{
+					var queue = self.traits.Get<ProductionQueue>();
+					var unit = Rules.Info[ order.TargetString ];
+					var producing = queue.CurrentItem(unit.Category);
+					if( producing == null || producing.Item != order.TargetString || producing.RemainingTime != 0 )
+						return;
+
+					self.World.CreateActor( order.TargetString, order.TargetLocation, order.Player );
+					Sound.PlayToPlayer(order.Player, "placbldg.aud");
+					Sound.PlayToPlayer(order.Player, "build5.aud");
+					
+					var facts = self.World.Queries.OwnedBy[self.Owner]
+						.WithTrait<ConstructionYard>().Select(x => x.Actor);
+					
+					var primaryFact = facts.Where(y => y.traits.Get<Production>().IsPrimary);
+					var fact = (primaryFact.Count() > 0) ? primaryFact.FirstOrDefault() : facts.FirstOrDefault();
+
+					if (fact != null)
+						fact.traits.Get<RenderBuilding>().PlayCustomAnim(fact, "build");
+						
+					queue.FinishProduction(unit.Category);
+				} );
+			}
+		}
+	}
+}