Add SpawnActorEffect

And use it to drop DelayedAction from ReinforcementsGlobal.

OpenRA.Mods.Common/Effects/SpawnActorEffect.cs

@@ -0,0 +1,64 @@
+#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.Effects;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Traits;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Effects
+{
+	public class SpawnActorEffect : IEffect
+	{
+		readonly Actor actor;
+		readonly CPos[] pathAfterSpawn;
+		readonly Activity activityAtDestination;
+		readonly IMove move;
+		int remainingDelay;
+
+		public SpawnActorEffect(Actor actor)
+			: this(actor, 0, new CPos[0], null) { }
+
+		public SpawnActorEffect(Actor actor, int delay)
+			: this(actor, delay, new CPos[0], null) { }
+
+		public SpawnActorEffect(Actor actor, int delay, CPos[] pathAfterSpawn, Activity activityAtDestination)
+		{
+			this.actor = actor;
+			remainingDelay = delay;
+			this.pathAfterSpawn = pathAfterSpawn;
+			this.activityAtDestination = activityAtDestination;
+			move = actor.TraitOrDefault<IMove>();
+		}
+
+		public void Tick(World world)
+		{
+			if (remainingDelay-- > 0)
+				return;
+
+			world.Add(actor);
+			if (move != null)
+				for (var j = 0; j < pathAfterSpawn.Length; j++)
+					actor.QueueActivity(move.MoveTo(pathAfterSpawn[j], 2));
+
+			if (activityAtDestination != null)
+				actor.QueueActivity(activityAtDestination);
+
+			world.AddFrameEndTask(w => w.Remove(this));
+		}
+
+		public IEnumerable<IRenderable> Render(WorldRenderer wr) { return SpriteRenderable.None; }
+	}
+}