Rename CancelableActivity.cs -> Activity.cs

OpenRA.Game/Traits/Activities/Activity.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OpenRA.Traits.Activities
+{
+	public abstract class Activity
+	{
+		public Activity NextActivity { get; set; }
+		protected bool IsCanceled { get; private set; }
+
+		public abstract Activity Tick( Actor self );
+
+		public virtual void Cancel( Actor self )
+		{
+			IsCanceled = true;
+			NextActivity = null;
+		}
+
+		public virtual void Queue( Activity activity )
+		{
+			if( NextActivity != null )
+				NextActivity.Queue( activity );
+			else
+				NextActivity = activity;
+		}
+		
+		public virtual IEnumerable<Target> GetTargets( Actor self )
+		{
+			yield break;
+		}
+	}
+	
+	public static class ActivityExts
+	{
+		public static IEnumerable<Target> GetTargetQueue( this Actor self )
+		{
+			return self.GetCurrentActivity().Iterate( u => u.NextActivity ).TakeWhile( u => u != null )
+				.SelectMany( u => u.GetTargets( self ) );
+		}
+	}
+}