Unhardcode VeteranProductionIconOverlay.

OpenRA.Mods.Common/Traits/Render/WithProductionIconOverlay.cs

@@ -0,0 +1,40 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2022 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;
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits.Render
+{
+	[Desc("Displays overlays from `ProductionIconOverlayManager` with matching types when defined prerequisites are granted.")]
+	public class WithProductionIconOverlayInfo : TraitInfo<WithProductionIconOverlay>, IRulesetLoaded
+	{
+		[FieldLoader.Require]
+		public readonly string[] Types = Array.Empty<string>();
+
+		public readonly string[] Prerequisites = Array.Empty<string>();
+
+		public virtual void RulesetLoaded(Ruleset rules, ActorInfo ai)
+		{
+			foreach (var type in Types)
+			{
+				if (!rules.Actors[SystemActors.Player].TraitInfos<ProductionIconOverlayManagerInfo>().Where(piom => piom.Type == type).Any())
+					throw new YamlException($"A 'ProductionIconOverlayManager' with type '{type}' doesn't exist.");
+
+				if (ai.TraitInfos<WithProductionIconOverlayInfo>().Where(wpio => wpio != this && wpio.Types.Contains(type)).Any())
+					throw new YamlException($"Multiple 'WithProductionIconOverlay's with type '{type}' exist on the actor.");
+			}
+		}
+	}
+
+	public class WithProductionIconOverlay { }
+}