Implement ground-level bridge destruction and repair.

OpenRA.Mods.Common/Traits/Buildings/BridgePlaceholder.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2016 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Linq;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Placeholder actor that transforms into another actor type when repaired.")]
+	class BridgePlaceholderInfo : ITraitInfo
+	{
+		public readonly string Type = "GroundLevelBridge";
+
+		[FieldLoader.Require]
+		[Desc("Actor type to replace with on repair.")]
+		[ActorReference] public readonly string ReplaceWithActor = null;
+
+		public readonly CVec[] NeighbourOffsets = { };
+
+		public object Create(ActorInitializer init) { return new BridgePlaceholder(init.Self, this); }
+	}
+
+	class BridgePlaceholder : IBridgeSegment, INotifyAddedToWorld, INotifyRemovedFromWorld
+	{
+		public readonly BridgePlaceholderInfo Info;
+		readonly Actor self;
+		readonly BridgeLayer bridgeLayer;
+
+		public BridgePlaceholder(Actor self, BridgePlaceholderInfo info)
+		{
+			Info = info;
+			this.self = self;
+			bridgeLayer = self.World.WorldActor.Trait<BridgeLayer>();
+		}
+
+		void INotifyAddedToWorld.AddedToWorld(Actor self)
+		{
+			bridgeLayer.Add(self);
+		}
+
+		void INotifyRemovedFromWorld.RemovedFromWorld(Actor self)
+		{
+			bridgeLayer.Remove(self);
+		}
+
+		void IBridgeSegment.Repair(Actor repairer)
+		{
+			self.World.AddFrameEndTask(w =>
+			{
+				self.Dispose();
+
+				w.CreateActor(Info.ReplaceWithActor, new TypeDictionary
+				{
+					new LocationInit(self.Location),
+					new OwnerInit(self.Owner),
+				});
+			});
+		}
+
+		void IBridgeSegment.Demolish(Actor saboteur)
+		{
+			// Do nothing, we're already dead
+		}
+
+		string IBridgeSegment.Type { get { return Info.Type; } }
+		DamageState IBridgeSegment.DamageState { get { return DamageState.Dead; } }
+		bool IBridgeSegment.Valid { get { return self.IsInWorld; } }
+		CVec[] IBridgeSegment.NeighbourOffsets { get { return Info.NeighbourOffsets; } }
+		CPos IBridgeSegment.Location { get { return self.Location; } }
+	}
+}