Add Support of Types for GivesBuildableArea

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

@@ -0,0 +1,36 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2017 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.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("This actor allows placement of other actors with 'RequiresBuildableArea' trait around it.")]
+	public class GivesBuildableAreaInfo : ConditionalTraitInfo
+	{
+		[FieldLoader.Require]
+		[Desc("Types of buildable area this actor gives.")]
+		public readonly HashSet<string> AreaTypes = new HashSet<string>();
+
+		public override object Create(ActorInitializer init) { return new GivesBuildableArea(this); }
+	}
+
+	public class GivesBuildableArea : ConditionalTrait<GivesBuildableAreaInfo>
+	{
+		public GivesBuildableArea(GivesBuildableAreaInfo info)
+			: base(info) { }
+
+		readonly HashSet<string> noAreaTypes = new HashSet<string>();
+
+		public HashSet<string> AreaTypes { get { return !IsTraitDisabled ? Info.AreaTypes : noAreaTypes; } }
+	}
+}