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/Conditions/GrantConditionOnPrerequisite.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.Immutable;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Grants a condition to the actor this is attached to when prerequisites are available.")]
+	public class GrantConditionOnPrerequisiteInfo : TraitInfo
+	{
+		[FieldLoader.Require]
+		[GrantedConditionReference]
+		[Desc("The condition to grant.")]
+		public readonly string Condition = null;
+
+		[FieldLoader.Require]
+		[Desc("List of required prerequisites.")]
+		public readonly ImmutableArray<string> Prerequisites = [];
+
+		public override object Create(ActorInitializer init) { return new GrantConditionOnPrerequisite(this); }
+	}
+
+	public class GrantConditionOnPrerequisite : INotifyCreated, INotifyAddedToWorld, INotifyRemovedFromWorld, INotifyOwnerChanged
+	{
+		readonly GrantConditionOnPrerequisiteInfo info;
+
+		bool wasAvailable;
+		GrantConditionOnPrerequisiteManager globalManager;
+		int conditionToken = Actor.InvalidConditionToken;
+
+		public GrantConditionOnPrerequisite(GrantConditionOnPrerequisiteInfo info)
+		{
+			this.info = info;
+		}
+
+		void INotifyCreated.Created(Actor self)
+		{
+			globalManager = self.Owner.PlayerActor.Trait<GrantConditionOnPrerequisiteManager>();
+		}
+
+		void INotifyAddedToWorld.AddedToWorld(Actor self)
+		{
+			if (info.Prerequisites.Length > 0)
+				globalManager.Register(self, this, info.Prerequisites);
+		}
+
+		void INotifyRemovedFromWorld.RemovedFromWorld(Actor self)
+		{
+			if (info.Prerequisites.Length > 0)
+				globalManager.Unregister(self, this, info.Prerequisites);
+		}
+
+		void INotifyOwnerChanged.OnOwnerChanged(Actor self, Player oldOwner, Player newOwner)
+		{
+			globalManager = newOwner.PlayerActor.Trait<GrantConditionOnPrerequisiteManager>();
+		}
+
+		public void PrerequisitesUpdated(Actor self, bool available)
+		{
+			if (available == wasAvailable)
+				return;
+
+			if (available && conditionToken == Actor.InvalidConditionToken)
+				conditionToken = self.GrantCondition(info.Condition);
+			else if (!available && conditionToken != Actor.InvalidConditionToken)
+				conditionToken = self.RevokeCondition(conditionToken);
+
+			wasAvailable = available;
+		}
+	}
+}