cargo: added EnterTransport activity; made things mostly work. still very WIP.

OpenRa.Game/Traits/Activities/EnterTransport.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRa.Game.Traits.Activities
+{
+	class EnterTransport : IActivity
+	{
+		public IActivity NextActivity { get; set; }
+		bool isCanceled;
+		public Actor transport;
+
+		public EnterTransport(Actor self, Actor transport)
+		{
+			this.transport = transport;
+		}
+
+		public IActivity Tick(Actor self)
+		{
+			if (isCanceled) return NextActivity;
+			if (transport == null || !transport.IsInWorld) return NextActivity;
+
+			var cargo = transport.traits.Get<Cargo>();
+			if (cargo.IsFull(transport)) 
+				return NextActivity;
+
+			cargo.Load(transport, self);
+			Game.world.AddFrameEndTask(w => w.Remove(self));
+
+			return this;
+		}
+
+		public void Cancel(Actor self) { isCanceled = true; NextActivity = null; }
+	}
+}

OpenRa.Game/Traits/Activities/UnloadCargo.cs

@@ -51,7 +51,8 @@ namespace OpenRa.Game.Traits.Activities
 			if (exitTile == null) 
 				return this;
 
-			var actor = cargo.UnloadOne(self);
+			var actor = cargo.Unload(self);
+
 			Game.world.AddFrameEndTask(w =>
 			{
 				w.Add(actor);