Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

OpenRA.Mods.Common/Traits/Player/GrantConditionOnPrerequisiteManager.cs

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+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * 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 System.Collections.Immutable;
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[TraitLocation(SystemActors.Player)]
+	[Desc("Attach this to the player actor.")]
+	public class GrantConditionOnPrerequisiteManagerInfo : TraitInfo, Requires<TechTreeInfo>
+	{
+		public override object Create(ActorInitializer init) { return new GrantConditionOnPrerequisiteManager(init); }
+	}
+
+	public class GrantConditionOnPrerequisiteManager : ITechTreeElement
+	{
+		readonly Actor self;
+		readonly Dictionary<string, List<(Actor Actor, GrantConditionOnPrerequisite GrantConditionOnPrerequisite)>> upgradables = [];
+		readonly TechTree techTree;
+
+		public GrantConditionOnPrerequisiteManager(ActorInitializer init)
+		{
+			self = init.Self;
+			techTree = self.Trait<TechTree>();
+		}
+
+		static string MakeKey(ImmutableArray<string> prerequisites)
+		{
+			return "condition_" + string.Join("_", prerequisites.Order());
+		}
+
+		public void Register(Actor actor, GrantConditionOnPrerequisite u, ImmutableArray<string> prerequisites)
+		{
+			var key = MakeKey(prerequisites);
+			if (!upgradables.TryGetValue(key, out var list))
+			{
+				upgradables.Add(key, list = []);
+				techTree.Add(key, prerequisites, 0, this);
+			}
+
+			list.Add((actor, u));
+
+			// Notify the current state
+			u.PrerequisitesUpdated(actor, techTree.HasPrerequisites(prerequisites));
+		}
+
+		public void Unregister(Actor actor, GrantConditionOnPrerequisite u, ImmutableArray<string> prerequisites)
+		{
+			var key = MakeKey(prerequisites);
+			var list = upgradables[key];
+
+			list.RemoveAll(x => x.Actor == actor && x.GrantConditionOnPrerequisite == u);
+			if (list.Count == 0)
+			{
+				upgradables.Remove(key);
+				techTree.Remove(key);
+			}
+		}
+
+		public void PrerequisitesAvailable(string key)
+		{
+			if (!upgradables.TryGetValue(key, out var list))
+				return;
+
+			foreach (var u in list)
+				u.GrantConditionOnPrerequisite.PrerequisitesUpdated(u.Actor, true);
+		}
+
+		public void PrerequisitesUnavailable(string key)
+		{
+			if (!upgradables.TryGetValue(key, out var list))
+				return;
+
+			foreach (var u in list)
+				u.GrantConditionOnPrerequisite.PrerequisitesUpdated(u.Actor, false);
+		}
+
+		public void PrerequisitesItemHidden(string key) { }
+		public void PrerequisitesItemVisible(string key) { }
+	}
+}