Shift temporary owner-change logic from D2k to Common.

OpenRA.Mods.Common/Warheads/ChangeOwnerWarhead.cs

@@ -0,0 +1,53 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 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.Collections.Generic;
+using OpenRA.Mods.Common.Traits;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Warheads
+{
+	[Desc("Interacts with the TemporaryOwnerManager trait.")]
+	public class ChangeOwnerWarhead : Warhead
+	{
+		[Desc("Duration of the owner change (in ticks). Set to 0 to make it permanent.")]
+		public readonly int Duration = 0;
+
+		public readonly WDist Range = WDist.FromCells(1);
+
+		public override void DoImpact(Target target, Actor firedBy, IEnumerable<int> damageModifiers)
+		{
+			var actors = target.Type == TargetType.Actor ? new[] { target.Actor } :
+				firedBy.World.FindActorsInCircle(target.CenterPosition, Range);
+
+			foreach (var a in actors)
+			{
+				// Don't do anything on friendly fire
+				if (a.Owner == firedBy.Owner)
+					continue;
+
+				if (Duration == 0)
+					a.ChangeOwner(firedBy.Owner); // Permanent
+				else
+				{
+					var tempOwnerManager = a.TraitOrDefault<TemporaryOwnerManager>();
+					if (tempOwnerManager == null)
+						continue;
+
+					tempOwnerManager.ChangeOwner(a, firedBy.Owner, Duration);
+				}
+
+				// Stop shooting, you have new enemies
+				a.CancelActivity();
+			}
+		}
+	}
+}