Add TransformsInto* traits to trigger construction yard undeploy.

OpenRA.Game/Activities/Activity.cs

@@ -27,7 +27,7 @@ namespace OpenRA.Activities
 	 *   Queue a new instance instead.
 	 * - Avoid calling actor.CancelActivity(). It is almost always a bug. Call activity.Cancel() instead.
 	 */
-	public abstract class Activity
+	public abstract class Activity : IActivityInterface
 	{
 		public ActivityState State { get; private set; }
 
@@ -172,9 +172,9 @@ namespace OpenRA.Activities
 			}
 		}
 
-		public IEnumerable<T> ActivitiesImplementing<T>() where T : IActivityInterface
+		public IEnumerable<T> ActivitiesImplementing<T>(bool includeChildren = true) where T : IActivityInterface
 		{
-			if (childActivity != null)
+			if (includeChildren && childActivity != null)
 				foreach (var a in childActivity.ActivitiesImplementing<T>())
 					yield return a;
 

OpenRA.Mods.Common/Activities/Transform.cs

@@ -9,6 +9,7 @@
  */
 #endregion
 
+using System;
 using OpenRA.Activities;
 using OpenRA.Mods.Common.Traits;
 using OpenRA.Mods.Common.Traits.Render;
@@ -87,6 +88,10 @@ namespace OpenRA.Mods.Common.Activities
 
 		void DoTransform(Actor self)
 		{
+			// This activity may be buried as a child within one or more parents
+			// We need to consider the top-level activities when transferring orders to the new actor!
+			var currentActivity = self.CurrentActivity;
+
 			self.World.AddFrameEndTask(w =>
 			{
 				if (self.IsDead || self.WillDispose)
@@ -132,6 +137,14 @@ namespace OpenRA.Mods.Common.Activities
 				foreach (var nt in self.TraitsImplementing<INotifyTransform>())
 					nt.AfterTransform(a);
 
+				// Use self.CurrentActivity to capture the parent activity if Transform is a child
+				foreach (var transfer in currentActivity.ActivitiesImplementing<IssueOrderAfterTransform>(false))
+				{
+					var order = transfer.IssueOrderForTransformedActor(a);
+					foreach (var t in a.TraitsImplementing<IResolveOrder>())
+						t.ResolveOrder(a, order);
+				}
+
 				self.ReplacedByActor = a;
 
 				if (selected)
@@ -142,4 +155,27 @@ namespace OpenRA.Mods.Common.Activities
 			});
 		}
 	}
+
+	class IssueOrderAfterTransform : Activity
+	{
+		readonly string orderString;
+		readonly Target target;
+
+		public IssueOrderAfterTransform(string orderString, Target target)
+		{
+			this.orderString = orderString;
+			this.target = target;
+		}
+
+		public Order IssueOrderForTransformedActor(Actor newActor)
+		{
+			return new Order(orderString, newActor, target, true);
+		}
+
+		public override Activity Tick(Actor self)
+		{
+			// Activity is a placeholder that should never run
+			return NextActivity;
+		}
+	}
 }

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

@@ -0,0 +1,184 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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.Collections.Generic;
+using System.Linq;
+using OpenRA.Activities;
+using OpenRA.Mods.Common.Activities;
+using OpenRA.Mods.Common.Orders;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Add to a building to expose a move cursor that triggers Transforms and issues a move order to the transformed actor.")]
+	public class TransformsIntoAircraftInfo : ConditionalTraitInfo, Requires<TransformsInfo>
+	{
+		[Desc("Can the actor be ordered to move in to shroud?")]
+		public readonly bool MoveIntoShroud = true;
+
+		[ActorReference]
+		[FieldLoader.Require]
+		public readonly HashSet<string> DockActors = new HashSet<string> { };
+
+		[VoiceReference]
+		public readonly string Voice = "Action";
+
+		public override object Create(ActorInitializer init) { return new TransformsIntoAircraft(init, this); }
+	}
+
+	public class TransformsIntoAircraft : ConditionalTrait<TransformsIntoAircraftInfo>, IIssueOrder, IResolveOrder, IOrderVoice
+	{
+		readonly Actor self;
+		Transforms[] transforms;
+
+		public TransformsIntoAircraft(ActorInitializer init, TransformsIntoAircraftInfo info)
+			: base(info)
+		{
+			self = init.Self;
+		}
+
+		protected override void Created(Actor self)
+		{
+			transforms = self.TraitsImplementing<Transforms>().ToArray();
+			base.Created(self);
+		}
+
+		IEnumerable<IOrderTargeter> IIssueOrder.Orders
+		{
+			get
+			{
+				if (!IsTraitDisabled)
+				{
+					yield return new EnterAlliedActorTargeter<BuildingInfo>("Enter", 5, AircraftCanEnter,
+					 target => Reservable.IsAvailableFor(target, self));
+					yield return new AircraftMoveOrderTargeter(self, this);
+				}
+			}
+		}
+
+		public bool AircraftCanEnter(Actor a)
+		{
+			return !self.AppearsHostileTo(a) && Info.DockActors.Contains(a.Info.Name);
+		}
+
+		// Note: Returns a valid order even if the unit can't move to the target
+		Order IIssueOrder.IssueOrder(Actor self, IOrderTargeter order, Target target, bool queued)
+		{
+			if (order.OrderID == "Enter" || order.OrderID == "Move")
+				return new Order(order.OrderID, self, target, queued);
+
+			return null;
+		}
+
+		void IResolveOrder.ResolveOrder(Actor self, Order order)
+		{
+			if (IsTraitDisabled)
+				return;
+
+			if (order.OrderString == "Move")
+			{
+				var cell = self.World.Map.Clamp(self.World.Map.CellContaining(order.Target.CenterPosition));
+				if (!Info.MoveIntoShroud && !self.Owner.Shroud.IsExplored(cell))
+					return;
+
+				var target = Target.FromCell(self.World, cell);
+
+				self.SetTargetLine(target, Color.Green);
+			}
+			else if (order.OrderString == "Enter")
+			{
+				// Enter and Repair orders are only valid for own/allied actors,
+				// which are guaranteed to never be frozen.
+				if (order.Target.Type != TargetType.Actor)
+					return;
+
+				var targetActor = order.Target.Actor;
+
+				// We only want to set a target line if the order will (most likely) succeed
+				if (Reservable.IsAvailableFor(targetActor, self))
+					self.SetTargetLine(Target.FromActor(targetActor), Color.Green);
+			}
+
+			var currentTransform = self.CurrentActivity as Transform;
+			var transform = transforms.FirstOrDefault(t => !t.IsTraitDisabled && !t.IsTraitPaused);
+			if (transform == null && currentTransform == null)
+				return;
+
+			var activity = currentTransform ?? transform.GetTransformActivity(self);
+			activity.Queue(self, new IssueOrderAfterTransform(order.OrderString, order.Target));
+
+			if (currentTransform == null)
+				self.QueueActivity(order.Queued, activity);
+		}
+
+		string IOrderVoice.VoicePhraseForOrder(Actor self, Order order)
+		{
+			if (IsTraitDisabled)
+				return null;
+
+			switch (order.OrderString)
+			{
+				case "Move":
+					if (!Info.MoveIntoShroud && order.Target.Type != TargetType.Invalid)
+					{
+						var cell = self.World.Map.CellContaining(order.Target.CenterPosition);
+						if (!self.Owner.Shroud.IsExplored(cell))
+							return null;
+					}
+
+					return Info.Voice;
+				case "Enter":
+					return Info.Voice;
+				default: return null;
+			}
+		}
+
+		class AircraftMoveOrderTargeter : IOrderTargeter
+		{
+			readonly TransformsIntoAircraft aircraft;
+
+			public bool TargetOverridesSelection(TargetModifiers modifiers)
+			{
+				return modifiers.HasModifier(TargetModifiers.ForceMove);
+			}
+
+			public AircraftMoveOrderTargeter(Actor self, TransformsIntoAircraft aircraft)
+			{
+				this.aircraft = aircraft;
+			}
+
+			public string OrderID { get { return "Move"; } }
+			public int OrderPriority { get { return 4; } }
+			public bool IsQueued { get; protected set; }
+
+			public bool CanTarget(Actor self, Target target, List<Actor> othersAtTarget, ref TargetModifiers modifiers, ref string cursor)
+			{
+				if (target.Type != TargetType.Terrain || (aircraft.Info.RequiresForceMove && !modifiers.HasModifier(TargetModifiers.ForceMove)))
+					return false;
+
+				var location = self.World.Map.CellContaining(target.CenterPosition);
+				var explored = self.Owner.Shroud.IsExplored(location);
+				cursor = self.World.Map.Contains(location) ?
+					(self.World.Map.GetTerrainInfo(location).CustomCursor ?? "move") :
+					"move-blocked";
+
+				IsQueued = modifiers.HasModifier(TargetModifiers.ForceQueue);
+
+				if (!explored && !aircraft.Info.MoveIntoShroud)
+					cursor = "move-blocked";
+
+				return true;
+			}
+		}
+	}
+}

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

@@ -0,0 +1,93 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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.Collections.Generic;
+using System.Linq;
+using OpenRA.Activities;
+using OpenRA.Mods.Common.Activities;
+using OpenRA.Mods.Common.Orders;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Add to a building to expose a move cursor that triggers Transforms and issues an enter tunnel order to the transformed actor.")]
+	public class TransformsIntoEntersTunnelsInfo : ConditionalTraitInfo, Requires<TransformsInfo>
+	{
+		public readonly string EnterCursor = "enter";
+		public readonly string EnterBlockedCursor = "enter-blocked";
+
+		[VoiceReference]
+		public readonly string Voice = "Action";
+
+		public override object Create(ActorInitializer init) { return new TransformsIntoEntersTunnels(this); }
+	}
+
+	public class TransformsIntoEntersTunnels : ConditionalTrait<TransformsIntoEntersTunnelsInfo>, IIssueOrder, IResolveOrder, IOrderVoice
+	{
+		Transforms[] transforms;
+
+		public TransformsIntoEntersTunnels(TransformsIntoEntersTunnelsInfo info)
+			: base(info) { }
+
+		protected override void Created(Actor self)
+		{
+			transforms = self.TraitsImplementing<Transforms>().ToArray();
+			base.Created(self);
+		}
+
+		IEnumerable<IOrderTargeter> IIssueOrder.Orders
+		{
+			get
+			{
+				if (!IsTraitDisabled)
+					yield return new EntersTunnels.EnterTunnelOrderTargeter(Info.EnterCursor, Info.EnterBlockedCursor);
+			}
+		}
+
+		Order IIssueOrder.IssueOrder(Actor self, IOrderTargeter order, Target target, bool queued)
+		{
+			if (order.OrderID == "EnterTunnel")
+				return new Order(order.OrderID, self, target, queued) { SuppressVisualFeedback = true };
+
+			return null;
+		}
+
+		void IResolveOrder.ResolveOrder(Actor self, Order order)
+		{
+			if (IsTraitDisabled || order.OrderString != "EnterTunnel" || order.Target.Type != TargetType.Actor)
+				return;
+
+			var tunnel = order.Target.Actor.TraitOrDefault<TunnelEntrance>();
+			if (tunnel == null || !tunnel.Exit.HasValue)
+				return;
+
+			var currentTransform = self.CurrentActivity as Transform;
+			var transform = transforms.FirstOrDefault(t => !t.IsTraitDisabled && !t.IsTraitPaused);
+			if (transform == null && currentTransform == null)
+				return;
+
+			self.SetTargetLine(order.Target, Color.Green);
+
+			var activity = currentTransform ?? transform.GetTransformActivity(self);
+			activity.Queue(self, new IssueOrderAfterTransform(order.OrderString, order.Target));
+
+			if (currentTransform == null)
+				self.QueueActivity(order.Queued, activity);
+		}
+
+		string IOrderVoice.VoicePhraseForOrder(Actor self, Order order)
+		{
+			return order.OrderString == "EnterTunnel" ? Info.Voice : null;
+		}
+	}
+}

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

@@ -0,0 +1,192 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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.Collections.Generic;
+using System.Linq;
+using OpenRA.Activities;
+using OpenRA.Mods.Common.Activities;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Add to a building to expose a move cursor that triggers Transforms and issues a move order to the transformed actor.")]
+	public class TransformsIntoMobileInfo : ConditionalTraitInfo, Requires<TransformsInfo>
+	{
+		[LocomotorReference]
+		[FieldLoader.Require]
+		[Desc("Locomotor used by the transformed actor. Must be defined on the World actor.")]
+		public readonly string Locomotor = null;
+
+		public readonly string Cursor = "move";
+		public readonly string BlockedCursor = "move-blocked";
+
+		[VoiceReference]
+		public readonly string Voice = "Action";
+
+		[Desc("Require the force-move modifier to display the move cursor.")]
+		public readonly bool RequiresForceMove = false;
+
+		public override object Create(ActorInitializer init) { return new TransformsIntoMobile(init, this); }
+
+		public LocomotorInfo LocomotorInfo { get; private set; }
+
+		public override void RulesetLoaded(Ruleset rules, ActorInfo ai)
+		{
+			var locomotorInfos = rules.Actors["world"].TraitInfos<LocomotorInfo>();
+			LocomotorInfo = locomotorInfos.FirstOrDefault(li => li.Name == Locomotor);
+			if (LocomotorInfo == null)
+				throw new YamlException("A locomotor named '{0}' doesn't exist.".F(Locomotor));
+			else if (locomotorInfos.Count(li => li.Name == Locomotor) > 1)
+				throw new YamlException("There is more than one locomotor named '{0}'.".F(Locomotor));
+
+			base.RulesetLoaded(rules, ai);
+		}
+	}
+
+	public class TransformsIntoMobile : ConditionalTrait<TransformsIntoMobileInfo>, IIssueOrder, IResolveOrder, IOrderVoice
+	{
+		readonly Actor self;
+		Transforms[] transforms;
+
+		public TransformsIntoMobile(ActorInitializer init, TransformsIntoMobileInfo info)
+			: base(info)
+		{
+			self = init.Self;
+		}
+
+		protected override void Created(Actor self)
+		{
+			transforms = self.TraitsImplementing<Transforms>().ToArray();
+			base.Created(self);
+		}
+
+		IEnumerable<IOrderTargeter> IIssueOrder.Orders
+		{
+			get
+			{
+				if (!IsTraitDisabled)
+					yield return new MoveOrderTargeter(self, this);
+			}
+		}
+
+		// Note: Returns a valid order even if the unit can't move to the target
+		Order IIssueOrder.IssueOrder(Actor self, IOrderTargeter order, Target target, bool queued)
+		{
+			if (order is MoveOrderTargeter)
+				return new Order("Move", self, target, queued);
+
+			return null;
+		}
+
+		void IResolveOrder.ResolveOrder(Actor self, Order order)
+		{
+			if (IsTraitDisabled)
+				return;
+
+			if (order.OrderString == "Move")
+			{
+				var cell = self.World.Map.Clamp(this.self.World.Map.CellContaining(order.Target.CenterPosition));
+				if (!Info.LocomotorInfo.MoveIntoShroud && !self.Owner.Shroud.IsExplored(cell))
+					return;
+
+				var currentTransform = self.CurrentActivity as Transform;
+				var transform = transforms.FirstOrDefault(t => !t.IsTraitDisabled && !t.IsTraitPaused);
+				if (transform == null && currentTransform == null)
+					return;
+
+				self.SetTargetLine(Target.FromCell(self.World, cell), Color.Green);
+
+				var activity = currentTransform ?? transform.GetTransformActivity(self);
+				activity.Queue(self, new IssueOrderAfterTransform("Move", order.Target));
+
+				if (currentTransform == null)
+					self.QueueActivity(order.Queued, activity);
+			}
+
+			if (order.OrderString == "Stop")
+				self.CancelActivity();
+		}
+
+		string IOrderVoice.VoicePhraseForOrder(Actor self, Order order)
+		{
+			if (IsTraitDisabled)
+				return null;
+
+			switch (order.OrderString)
+			{
+				case "Move":
+					if (!Info.LocomotorInfo.MoveIntoShroud && order.Target.Type != TargetType.Invalid)
+					{
+						var cell = self.World.Map.CellContaining(order.Target.CenterPosition);
+						if (!self.Owner.Shroud.IsExplored(cell))
+							return null;
+					}
+
+					return Info.Voice;
+				case "Stop":
+					return Info.Voice;
+				default:
+					return null;
+			}
+		}
+
+		class MoveOrderTargeter : IOrderTargeter
+		{
+			readonly TransformsIntoMobile mobile;
+			readonly bool rejectMove;
+			public bool TargetOverridesSelection(TargetModifiers modifiers)
+			{
+				return modifiers.HasModifier(TargetModifiers.ForceMove);
+			}
+
+			public MoveOrderTargeter(Actor self, TransformsIntoMobile mobile)
+			{
+				this.mobile = mobile;
+				rejectMove = !self.AcceptsOrder("Move");
+			}
+
+			public string OrderID { get { return "Move"; } }
+			public int OrderPriority { get { return 4; } }
+			public bool IsQueued { get; protected set; }
+
+			public bool CanTarget(Actor self, Target target, List<Actor> othersAtTarget, ref TargetModifiers modifiers, ref string cursor)
+			{
+				if (rejectMove || target.Type != TargetType.Terrain || (mobile.Info.RequiresForceMove && !modifiers.HasModifier(TargetModifiers.ForceMove)))
+					return false;
+
+				var location = self.World.Map.CellContaining(target.CenterPosition);
+				IsQueued = modifiers.HasModifier(TargetModifiers.ForceQueue);
+
+				var explored = self.Owner.Shroud.IsExplored(location);
+				cursor = self.World.Map.Contains(location) ?
+					(self.World.Map.GetTerrainInfo(location).CustomCursor ?? mobile.Info.Cursor) : mobile.Info.BlockedCursor;
+
+				var locomotor = mobile.Info.LocomotorInfo;
+				if (!mobile.transforms.Any(t => !t.IsTraitDisabled && !t.IsTraitPaused)
+					|| (!explored && !locomotor.MoveIntoShroud)
+					|| (explored && !CanEnterCell(self.World, self, location)))
+					cursor = mobile.Info.BlockedCursor;
+
+				return true;
+			}
+
+			bool CanEnterCell(World world, Actor self, CPos cell)
+			{
+				if (mobile.Info.LocomotorInfo.MovementCostForCell(world, cell) == int.MaxValue)
+					return false;
+
+				return mobile.Info.LocomotorInfo.CanMoveFreelyInto(world, self, cell, null, CellConditions.BlockedByMovers);
+			}
+		}
+	}
+}

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

@@ -0,0 +1,142 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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.Collections.Generic;
+using System.Linq;
+using OpenRA.Activities;
+using OpenRA.Mods.Common.Activities;
+using OpenRA.Mods.Common.Orders;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Add to a building to expose a move cursor that triggers Transforms and issues an EnterTransport order to the transformed actor.")]
+	public class TransformsIntoPassengerInfo : ConditionalTraitInfo, Requires<TransformsInfo>
+	{
+		public readonly string CargoType = null;
+		public readonly int Weight = 1;
+
+		[Desc("Use to set when to use alternate transports (Never, Force, Default, Always).",
+			"Force - use force move modifier (Alt) to enable.",
+			"Default - use force move modifier (Alt) to disable.")]
+		public readonly AlternateTransportsMode AlternateTransportsMode = AlternateTransportsMode.Force;
+
+		[VoiceReference]
+		public readonly string Voice = "Action";
+
+		public override object Create(ActorInitializer init) { return new TransformsIntoPassenger(this); }
+	}
+
+	public class TransformsIntoPassenger : ConditionalTrait<TransformsIntoPassengerInfo>, IIssueOrder, IResolveOrder, IOrderVoice
+	{
+		readonly IOrderTargeter[] orders;
+		Transforms[] transforms;
+
+		public TransformsIntoPassenger(TransformsIntoPassengerInfo info)
+			: base(info)
+		{
+			Func<Actor, bool> canTarget = IsCorrectCargoType;
+			Func<Actor, bool> useEnterCursor = CanEnter;
+			orders = new EnterAlliedActorTargeter<CargoInfo>[]
+			{
+				new EnterTransportTargeter("EnterTransport", 5, canTarget, useEnterCursor, Info.AlternateTransportsMode),
+				new EnterTransportsTargeter("EnterTransports", 5, canTarget, useEnterCursor, Info.AlternateTransportsMode)
+			};
+		}
+
+		protected override void Created(Actor self)
+		{
+			transforms = self.TraitsImplementing<Transforms>().ToArray();
+			base.Created(self);
+		}
+
+		IEnumerable<IOrderTargeter> IIssueOrder.Orders
+		{
+			get
+			{
+				return !IsTraitDisabled ? orders : Enumerable.Empty<IOrderTargeter>();
+			}
+		}
+
+		Order IIssueOrder.IssueOrder(Actor self, IOrderTargeter order, Target target, bool queued)
+		{
+			if (order.OrderID == "EnterTransport" || order.OrderID == "EnterTransports")
+				return new Order(order.OrderID, self, target, queued);
+
+			return null;
+		}
+
+		bool IsCorrectCargoType(Actor target)
+		{
+			var ci = target.Info.TraitInfo<CargoInfo>();
+			return ci.Types.Contains(Info.CargoType);
+		}
+
+		bool CanEnter(Actor target)
+		{
+			if (!transforms.Any(t => !t.IsTraitDisabled && !t.IsTraitPaused))
+				return false;
+
+			var cargo = target.TraitOrDefault<Cargo>();
+			return cargo != null && cargo.HasSpace(Info.Weight);
+		}
+
+		void IResolveOrder.ResolveOrder(Actor self, Order order)
+		{
+			if (IsTraitDisabled)
+				return;
+
+			if (order.OrderString != "EnterTransport" && order.OrderString != "EnterTransports")
+				return;
+
+			// Enter orders are only valid for own/allied actors,
+			// which are guaranteed to never be frozen.
+			if (order.Target.Type != TargetType.Actor)
+				return;
+
+			var targetActor = order.Target.Actor;
+			if (!CanEnter(targetActor))
+				return;
+
+			if (!IsCorrectCargoType(targetActor))
+				return;
+
+			var currentTransform = self.CurrentActivity as Transform;
+			var transform = transforms.FirstOrDefault(t => !t.IsTraitDisabled && !t.IsTraitPaused);
+			if (transform == null && currentTransform == null)
+				return;
+
+			self.SetTargetLine(order.Target, Color.Green);
+
+			var activity = currentTransform ?? transform.GetTransformActivity(self);
+			activity.Queue(self, new IssueOrderAfterTransform(order.OrderString, order.Target));
+
+			if (currentTransform == null)
+				self.QueueActivity(order.Queued, activity);
+		}
+
+		string IOrderVoice.VoicePhraseForOrder(Actor self, Order order)
+		{
+			if (IsTraitDisabled)
+				return null;
+
+			if (order.OrderString != "EnterTransport" && order.OrderString != "EnterTransports")
+				return null;
+
+			if (order.Target.Type != TargetType.Actor || !CanEnter(order.Target.Actor))
+				return null;
+
+			return Info.Voice;
+		}
+	}
+}

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

@@ -0,0 +1,110 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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.Collections.Generic;
+using System.Linq;
+using OpenRA.Activities;
+using OpenRA.Mods.Common.Activities;
+using OpenRA.Mods.Common.Orders;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Add to a building to expose a move cursor that triggers Transforms and issues a repair order to the transformed actor.")]
+	public class TransformsIntoRepairableInfo : ConditionalTraitInfo, Requires<TransformsInfo>, Requires<IHealthInfo>
+	{
+		[ActorReference]
+		[FieldLoader.Require]
+		public readonly HashSet<string> RepairActors = new HashSet<string> { };
+
+		[VoiceReference]
+		public readonly string Voice = "Action";
+
+		public override object Create(ActorInitializer init) { return new TransformsIntoRepairable(this); }
+	}
+
+	public class TransformsIntoRepairable : ConditionalTrait<TransformsIntoRepairableInfo>, IIssueOrder, IResolveOrder, IOrderVoice
+	{
+		Transforms[] transforms;
+		IHealth health;
+
+		public TransformsIntoRepairable(TransformsIntoRepairableInfo info)
+			: base(info) { }
+
+		protected override void Created(Actor self)
+		{
+			transforms = self.TraitsImplementing<Transforms>().ToArray();
+			health = self.Trait<IHealth>();
+			base.Created(self);
+		}
+
+		IEnumerable<IOrderTargeter> IIssueOrder.Orders
+		{
+			get
+			{
+				if (!IsTraitDisabled)
+					yield return new EnterAlliedActorTargeter<BuildingInfo>("Repair", 5, CanRepairAt, _ => CanRepair());
+			}
+		}
+
+		bool CanRepair()
+		{
+			return health.DamageState > DamageState.Undamaged && transforms.Any(t => !t.IsTraitDisabled && !t.IsTraitPaused);
+		}
+
+		bool CanRepairAt(Actor target)
+		{
+			return Info.RepairActors.Contains(target.Info.Name);
+		}
+
+		Order IIssueOrder.IssueOrder(Actor self, IOrderTargeter order, Target target, bool queued)
+		{
+			if (order.OrderID == "Repair")
+				return new Order(order.OrderID, self, target, queued);
+
+			return null;
+		}
+
+		void IResolveOrder.ResolveOrder(Actor self, Order order)
+		{
+			if (IsTraitDisabled || order.OrderString != "Repair")
+				return;
+
+			// Repair orders are only valid for own/allied actors,
+			// which are guaranteed to never be frozen.
+			if (order.Target.Type != TargetType.Actor)
+				return;
+
+			if (!CanRepairAt(order.Target.Actor) || !CanRepair())
+				return;
+
+			var currentTransform = self.CurrentActivity as Transform;
+			var transform = transforms.FirstOrDefault(t => !t.IsTraitDisabled && !t.IsTraitPaused);
+			if (transform == null && currentTransform == null)
+				return;
+
+			self.SetTargetLine(order.Target, Color.Green);
+
+			var activity = currentTransform ?? transform.GetTransformActivity(self);
+			activity.Queue(self, new IssueOrderAfterTransform(order.OrderString, order.Target));
+
+			if (currentTransform == null)
+				self.QueueActivity(order.Queued, activity);
+		}
+
+		string IOrderVoice.VoicePhraseForOrder(Actor self, Order order)
+		{
+			return order.OrderString == "Repair" && !IsTraitDisabled && CanRepair() ? Info.Voice : null;
+		}
+	}
+}

OpenRA.Mods.Common/Traits/EntersTunnels.cs

@@ -44,7 +44,7 @@ namespace OpenRA.Mods.Common.Traits
 		{
 			get
 			{
-				yield return new EnterTunnelOrderTargeter(info);
+				yield return new EnterTunnelOrderTargeter(info.EnterCursor, info.EnterBlockedCursor);
 			}
 		}
 
@@ -78,14 +78,16 @@ namespace OpenRA.Mods.Common.Traits
 			self.QueueActivity(move.MoveTo(tunnel.Exit.Value, tunnel.NearEnough));
 		}
 
-		class EnterTunnelOrderTargeter : UnitOrderTargeter
+		public class EnterTunnelOrderTargeter : UnitOrderTargeter
 		{
-			readonly EntersTunnelsInfo info;
+			readonly string enterCursor;
+			readonly string enterBlockedCursor;
 
-			public EnterTunnelOrderTargeter(EntersTunnelsInfo info)
-				: base("EnterTunnel", 6, info.EnterCursor, true, true)
+			public EnterTunnelOrderTargeter(string enterCursor, string enterBlockedCursor)
+				: base("EnterTunnel", 6, enterCursor, true, true)
 			{
-				this.info = info;
+				this.enterCursor = enterCursor;
+				this.enterBlockedCursor = enterBlockedCursor;
 			}
 
 			public override bool CanTargetActor(Actor self, Actor target, TargetModifiers modifiers, ref string cursor)
@@ -109,11 +111,11 @@ namespace OpenRA.Mods.Common.Traits
 
 				if (!tunnel.Exit.HasValue)
 				{
-					cursor = info.EnterBlockedCursor;
+					cursor = enterBlockedCursor;
 					return false;
 				}
 
-				cursor = info.EnterCursor;
+				cursor = enterCursor;
 				return true;
 			}
 

OpenRA.Mods.Common/Traits/Transforms.cs

@@ -10,6 +10,7 @@
 #endregion
 
 using System.Collections.Generic;
+using OpenRA.Activities;
 using OpenRA.Mods.Common.Activities;
 using OpenRA.Mods.Common.Orders;
 using OpenRA.Traits;
@@ -85,6 +86,18 @@ namespace OpenRA.Mods.Common.Traits
 			return buildingInfo == null || self.World.CanPlaceBuilding(self.Location + Info.Offset, actorInfo, buildingInfo, self);
 		}
 
+		public Activity GetTransformActivity(Actor self)
+		{
+			return new Transform(self, Info.IntoActor)
+			{
+				Offset = Info.Offset,
+				Facing = Info.Facing,
+				Sounds = Info.TransformSounds,
+				Notification = Info.TransformNotification,
+				Faction = faction
+			};
+		}
+
 		public IEnumerable<IOrderTargeter> Orders
 		{
 			get
@@ -127,14 +140,7 @@ namespace OpenRA.Mods.Common.Traits
 			if (!queued)
 				self.CancelActivity();
 
-			self.QueueActivity(new Transform(self, Info.IntoActor)
-			{
-				Offset = Info.Offset,
-				Facing = Info.Facing,
-				Sounds = Info.TransformSounds,
-				Notification = Info.TransformNotification,
-				Faction = faction
-			});
+			self.QueueActivity(GetTransformActivity(self));
 		}
 
 		public void ResolveOrder(Actor self, Order order)

mods/cnc/rules/structures.yaml

@@ -20,11 +20,21 @@ FACT:
 	Production:
 		Produces: Building.GDI, Building.Nod, Defence.GDI, Defence.Nod
 	Transforms:
-		RequiresCondition: factundeploy && !build-incomplete
-		PauseOnCondition: being-demolished
+		RequiresCondition: factundeploy
+		PauseOnCondition: being-demolished || build-incomplete
 		IntoActor: mcv
 		Offset: 1,1
 		Facing: 108
+	TransformsIntoMobile:
+		RequiresCondition: factundeploy
+		Locomotor: heavywheeled
+		RequiresForceMove: true
+	TransformsIntoPassenger:
+		RequiresCondition: factundeploy
+		CargoType: Vehicle
+	TransformsIntoRepairable:
+		RequiresCondition: factundeploy
+		RepairActors: fix
 	GrantConditionOnPrerequisite@GLOBALFACTUNDEPLOY:
 		Condition: factundeploy
 		Prerequisites: global-factundeploy

mods/ra/rules/structures.yaml

@@ -1137,11 +1137,21 @@ FACT:
 		ActorTypes: e1,e1,e1,tecn,tecn,e6
 	BaseBuilding:
 	Transforms:
-		RequiresCondition: factundeploy && !build-incomplete
-		PauseOnCondition: chrono-vortex || being-captured || being-demolished
+		RequiresCondition: factundeploy
+		PauseOnCondition: chrono-vortex || being-captured || being-demolished || build-incomplete
 		IntoActor: mcv
 		Offset: 1,1
 		Facing: 96
+	TransformsIntoMobile:
+		RequiresCondition: factundeploy
+		Locomotor: heavywheeled
+		RequiresForceMove: true
+	TransformsIntoPassenger:
+		RequiresCondition: factundeploy
+		CargoType: Vehicle
+	TransformsIntoRepairable:
+		RequiresCondition: factundeploy
+		RepairActors: fix
 	Sellable:
 		RequiresCondition: !build-incomplete && !chrono-vortex && !being-captured && !being-demolished
 	GrantConditionOnPrerequisite@GLOBALFACTUNDEPLOY:

mods/ts/rules/shared-structures.yaml

@@ -28,12 +28,28 @@ GACNST:
 		Value: 2500
 	BaseBuilding:
 	Transforms:
-		RequiresCondition: factundeploy && !build-incomplete
-		PauseOnCondition: empdisable || being-demolished
+		RequiresCondition: factundeploy
+		PauseOnCondition: empdisable || being-demolished || build-incomplete
 		IntoActor: mcv
 		Offset: 1,1
 		Facing: 96
 		DeployCursor: undeploy
+	TransformsIntoMobile:
+		RequiresCondition: factundeploy
+		Locomotor: tracked
+		Voice: Move
+		RequiresForceMove: true
+	TransformsIntoRepairable:
+		RequiresCondition: factundeploy
+		RepairActors: gadept
+		Voice: Move
+	TransformsIntoEntersTunnels:
+		RequiresCondition: factundeploy
+		Voice: Move
+	TransformsIntoPassenger:
+		RequiresCondition: factundeploy
+		CargoType: Vehicle
+		Voice: Move
 	GrantConditionOnPrerequisite@GLOBALFACTUNDEPLOY:
 		Condition: factundeploy
 		Prerequisites: global-factundeploy