make C4 Demolition frozen actor aware

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -83,11 +83,14 @@ namespace OpenRA.Traits
 	public interface ISeedableResource { void Seed(Actor self); }
 
 	public interface IAcceptInfiltrator { void OnInfiltrate(Actor self, Actor infiltrator); }
+
+	public interface IDemolishableInfo { bool IsValidTarget(ActorInfo actorInfo, Actor saboteur); }
 	public interface IDemolishable
 	{
 		void Demolish(Actor self, Actor saboteur);
 		bool IsValidTarget(Actor self, Actor saboteur);
 	}
+
 	public interface IStoreOre { int Capacity { get; } }
 	public interface INotifyDocking { void Docked(Actor self, Actor harvester); void Undocked(Actor self, Actor harvester); }
 	public interface IEffectiveOwner

OpenRA.Mods.RA/BridgeHut.cs

@@ -1,6 +1,6 @@
 #region Copyright & License Information
 /*
- * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
  * This file is part of OpenRA, which is free software. It is made
  * available to you under the terms of the GNU General Public License
  * as published by the Free Software Foundation. For more information,
@@ -12,8 +12,10 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA
 {
-	class BridgeHutInfo : ITraitInfo
+	class BridgeHutInfo : IDemolishableInfo, ITraitInfo
 	{
+		public bool IsValidTarget(ActorInfo actorInfo, Actor saboteur) { return false; } // TODO: bridges don't support frozen under fog
+
 		public object Create(ActorInitializer init) { return new BridgeHut(init); }
 	}
 

OpenRA.Mods.RA/Buildings/Demolishable.cs

@@ -1,6 +1,6 @@
 #region Copyright & License Information
 /*
- * Copyright 2007-2013 The OpenRA Developers (see AUTHORS)
+ * Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
  * This file is part of OpenRA, which is free software. It is made
  * available to you under the terms of the GNU General Public License
  * as published by the Free Software Foundation. For more information,
@@ -14,7 +14,12 @@ using OpenRA.FileFormats;
 namespace OpenRA.Mods.RA
 {
 	[Desc("Handle demolitions from C4 explosives.")]
-	public class DemolishableInfo : TraitInfo<Demolishable> { }
+	public class DemolishableInfo : IDemolishableInfo, ITraitInfo
+	{
+		public bool IsValidTarget(ActorInfo actorInfo, Actor saboteur) { return true; }
+
+		public object Create(ActorInitializer init) { return new Demolishable(); }
+	}
 
 	public class Demolishable : IDemolishable
 	{

OpenRA.Mods.RA/C4Demolition.cs

@@ -1,6 +1,6 @@
 #region Copyright & License Information
 /*
- * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
  * This file is part of OpenRA, which is free software. It is made
  * available to you under the terms of the GNU General Public License
  * as published by the Free Software Foundation. For more information,
@@ -10,6 +10,7 @@
 
 using System.Collections.Generic;
 using System.Drawing;
+using System.Linq;
 using OpenRA.Mods.RA.Activities;
 using OpenRA.Mods.RA.Orders;
 using OpenRA.Traits;
@@ -19,6 +20,7 @@ namespace OpenRA.Mods.RA
 	class C4DemolitionInfo : ITraitInfo
 	{
 		public readonly int C4Delay = 45; // 1.8 seconds
+
 		public object Create(ActorInitializer init) { return new C4Demolition(this); }
 	}
 
@@ -83,20 +85,12 @@ namespace OpenRA.Mods.RA
 				if (modifiers.HasModifier(TargetModifiers.ForceMove))
 					return false;
 
-				var demolishable = target.TraitOrDefault<IDemolishable>();
+				return target.TraitsImplementing<IDemolishable>().Any(i => i.IsValidTarget(target, self));
-				if (demolishable == null || !demolishable.IsValidTarget(target, self))
-					return false;
-
-				return true;
 			}
 
 			public override bool CanTargetFrozenActor(Actor self, FrozenActor target, TargetModifiers modifiers, ref string cursor)
 			{
-				// TODO: Bridges don't yet support FrozenUnderFog.
+				return target.Info.Traits.WithInterface<IDemolishableInfo>().Any(i => i.IsValidTarget(target.Info, self));
-				if (target.Actor != null && target.Actor.HasTrait<BridgeHut>())
-					return false;
-
-				return true;
 			}
 		}
 	}