selection persists across OG changes

OpenRa.Game/Controller.cs

@@ -13,6 +13,7 @@ namespace OpenRa
 	public class Controller : IHandleInput
 	{
 		public IOrderGenerator orderGenerator;
+		public Selection selection = new Selection();
 
 		readonly Func<Modifiers> GetModifierKeys;
 
@@ -22,10 +23,7 @@ namespace OpenRa
 			CancelInputMode();
 		}
 
-		public void CancelInputMode()
-		{
-			orderGenerator = new UnitOrderGenerator(new Actor[] { });
-		}
+		public void CancelInputMode() { orderGenerator = new UnitOrderGenerator(); }
 
 		public bool ToggleInputMode<T>() where T : IOrderGenerator, new()
 		{
@@ -83,7 +81,7 @@ namespace OpenRa
 				if (orderGenerator is UnitOrderGenerator)
 				{
 					var newSelection = world.SelectActorsInBox(Game.CellSize * dragStart, Game.CellSize * xy);
-					CombineSelection(world, newSelection, mi.Modifiers.HasModifier(Modifiers.Shift), dragStart == xy);
+					selection.Combine(world, newSelection, mi.Modifiers.HasModifier(Modifiers.Shift), dragStart == xy);
 				}
 
 				dragStart = dragEnd = xy;
@@ -98,29 +96,6 @@ namespace OpenRa
 			return true;
 		}
 
-		void CombineSelection(World world, IEnumerable<Actor> newSelection, bool isCombine, bool isClick)
-		{
-			var oldSelection = (orderGenerator is UnitOrderGenerator)
-							   ? (orderGenerator as UnitOrderGenerator).selection : new Actor[] { }.AsEnumerable();
-
-			if (isClick)
-			{
-				var adjNewSelection = newSelection.Take(1);	/* todo: select BEST, not FIRST */
-				orderGenerator = new UnitOrderGenerator(isCombine
-					? oldSelection.SymmetricDifference(adjNewSelection) : adjNewSelection);
-			}
-			else
-				orderGenerator = new UnitOrderGenerator(isCombine
-					? oldSelection.Union(newSelection) : newSelection);
-
-			var voicedUnit = ((UnitOrderGenerator)orderGenerator).selection
-				.Where(a => a.traits.Contains<Unit>()
-					&& a.Owner == world.LocalPlayer)
-				.FirstOrDefault();
-
-			Sound.PlayVoice("Select", voicedUnit);
-		}
-
 		public Pair<float2, float2>? SelectionBox
 		{
 			get
@@ -158,20 +133,17 @@ namespace OpenRa
 
 		public void DoControlGroup(World world, int group, Modifiers mods)
 		{
-			var uog = orderGenerator as UnitOrderGenerator;
-			if (uog == null) return;
-
 			if (mods.HasModifier(Modifiers.Ctrl))
 			{
-				if (!uog.selection.Any())
+				if (!selection.Actors.Any())
 					return;
 
 				controlGroups[group].Clear();
 
 				for (var i = 0; i < 10; i++)	/* all control groups */
-					controlGroups[i].RemoveAll(a => uog.selection.Contains(a));
+					controlGroups[i].RemoveAll(a => selection.Actors.Contains(a));
 
-				controlGroups[group].AddRange(uog.selection);
+				controlGroups[group].AddRange(selection.Actors);
 				return;
 			}
 
@@ -181,7 +153,8 @@ namespace OpenRa
 				return;
 			}
 
-			CombineSelection(world, controlGroups[group], mods.HasModifier(Modifiers.Shift), false);
+			selection.Combine(world, controlGroups[group], 
+				mods.HasModifier(Modifiers.Shift), false);
 		}
 
 		public int? GetControlGroupForActor(Actor a)
@@ -191,4 +164,33 @@ namespace OpenRa
 				.FirstOrDefault();
 		}
 	}
+
+	public class Selection
+	{
+		List<Actor> actors = new List<Actor>();
+
+		public void Combine(World world, IEnumerable<Actor> newSelection, bool isCombine, bool isClick)
+		{
+			var oldSelection = actors.AsEnumerable();
+
+			if (isClick)
+			{
+				var adjNewSelection = newSelection.Take(1);	/* todo: select BEST, not FIRST */
+				actors = (isCombine ? oldSelection.SymmetricDifference(adjNewSelection) : adjNewSelection).ToList();
+			}
+			else
+				actors = (isCombine ? oldSelection.Union(newSelection) : newSelection).ToList();
+
+			var voicedUnit = actors.FirstOrDefault(a => a.traits.Contains<Unit>() && a.Owner == world.LocalPlayer);
+			Sound.PlayVoice("Select", voicedUnit);
+		}
+
+		public IEnumerable<Actor> Actors { get { return actors; } }
+		public void Clear() { actors = new List<Actor>(); }
+
+		public void Tick(World world)
+		{
+			actors.RemoveAll(a => !a.IsInWorld);
+		}
+	}
 }

OpenRa.Game/Game.cs

@@ -153,9 +153,9 @@ namespace OpenRa
 
 					if (orderManager.IsReadyForNextFrame)
 					{
-						orderManager.Tick( world );
-						if (controller.orderGenerator != null)
-							controller.orderGenerator.Tick( world );
+						orderManager.Tick(world);
+						controller.orderGenerator.Tick(world);
+						controller.selection.Tick(world);
 
 						world.Tick();
 					}

OpenRa.Game/Orders/UnitOrderGenerator.cs

@@ -8,16 +8,9 @@ namespace OpenRa.Orders
 {
 	class UnitOrderGenerator : IOrderGenerator
 	{
-		public readonly List<Actor> selection;
-
-		public UnitOrderGenerator( IEnumerable<Actor> selected )
-		{
-			selection = selected.ToList();
-		}
-
 		public IEnumerable<Order> Order( World world, int2 xy, MouseInput mi )
 		{
-			foreach( var unit in selection )
+			foreach( var unit in Game.controller.selection.Actors )
 			{
 				var ret = unit.Order( xy, mi );
 				if( ret != null )
@@ -25,14 +18,11 @@ namespace OpenRa.Orders
 			}
 		}
 
-		public void Tick( World world )
-		{
-			selection.RemoveAll(a => !a.IsInWorld);
-		}
+		public void Tick( World world ) {}
 
 		public void Render( World world )
 		{
-			foreach( var a in selection )
+			foreach( var a in Game.controller.selection.Actors )
 				world.WorldRenderer.DrawSelectionBox( a, Color.White, true );
 		}
 

OpenRa.Game/Traits/RallyPoint.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 using OpenRa.Graphics;
 using OpenRa.Orders;
 
@@ -27,8 +28,7 @@ namespace OpenRa.Traits
 
 		public IEnumerable<Renderable> Render(Actor self)
 		{
-			var uog = Game.controller.orderGenerator as UnitOrderGenerator;
-			if (uog != null && self.Owner == self.World.LocalPlayer && uog.selection.Contains(self))
+			if (self.Owner == self.World.LocalPlayer && Game.controller.selection.Actors.Contains(self))
 				yield return Util.Centered(self,
 					anim.Image, Util.CenterOfCell(rallyPoint));
 		}