Moved: BaseBuilding out of core => RA

Implemented: INotifyKeyPress for World traits (to respond on key pressed)
Moved: GotoNextBase (backspace key) out of core => RA
Added: GotoNextBase trait to both RA & CNC

OpenRA.Mods.RA/BaseBuilding.cs

@@ -0,0 +1,8 @@
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA
+{
+	/* tag trait for "bases": mcv/fact */
+	public class BaseBuildingInfo : TraitInfo<BaseBuilding> { }
+	public class BaseBuilding { }
+}

OpenRA.Mods.RA/OpenRA.Mods.RA.csproj

@@ -82,6 +82,7 @@
     <Compile Include="Activities\Wait.cs" />
     <Compile Include="AttackBase.cs" />
     <Compile Include="AttackMove.cs" />
+    <Compile Include="BaseBuilding.cs" />
     <Compile Include="Buildable.cs" />
     <Compile Include="Buildings\BibLayer.cs" />
     <Compile Include="Buildings\Building.cs" />
@@ -288,6 +289,7 @@
     <Compile Include="NullLoadScreen.cs" />
     <Compile Include="Activities\IdleAnimation.cs" />
     <Compile Include="IdleAnimation.cs" />
+    <Compile Include="World\GotoNextBase.cs" />
     <Compile Include="World\SmudgeLayer.cs" />
     <Compile Include="Scripting\Media.cs" />
     <Compile Include="OpenWidgetAtGameStart.cs" />

OpenRA.Mods.RA/World/GotoNextBase.cs

@@ -0,0 +1,44 @@
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA
+{
+	public class GotoNextBaseInfo : TraitInfo<GotoNextBase>
+	{
+
+	}
+
+	public class GotoNextBase : INotifyKeyPress
+	{
+		public bool KeyPressed(Actor self, KeyInput e)
+		{
+			if (self.World.LocalPlayer == null) return false;
+
+			if (e.KeyChar == '\b' || e.KeyChar == (char)127)
+			{
+				CycleBases(self.World);
+				return true;
+			}
+
+			return false;
+		}
+
+		public static void CycleBases(World world)
+		{
+			var bases = world.Queries.OwnedBy[world.LocalPlayer].WithTrait<BaseBuilding>().ToArray();
+			if (!bases.Any()) return;
+
+			var next = bases
+				.Select(b => b.Actor)
+				.SkipWhile(b => !world.Selection.Actors.Contains(b))
+				.Skip(1)
+				.FirstOrDefault();
+
+			if (next == null)
+				next = bases.Select(b => b.Actor).First();
+
+			world.Selection.Combine(world, new Actor[] { next }, false, true);
+			Game.viewport.Center(world.Selection.Actors);
+		}
+	}
+}