Keyboard support for production palette:

y/u/i/o/p map to Buildings/Defense/Infantry/Vehicles/Aircraft.
Tab or successive y/u/i/o/p will switch tabs within a category.
Successive clicks on category icons will also switch tabs.
Shift + keyboard/click cycles tabs in reverse.

OpenRA.Mods.Cnc/Widgets/Logic/CncIngameChromeLogic.cs

@@ -23,6 +23,7 @@ namespace OpenRA.Mods.Cnc.Widgets.Logic
 		MenuType menu = MenuType.None;
 		
 		Widget ingameRoot;
+		ProductionTabsWidget queueTabs;
 		World world;
 		
 		void AddChatLine(Color c, string from, string text)
@@ -35,19 +36,37 @@ namespace OpenRA.Mods.Cnc.Widgets.Logic
 			Game.AddChatLine -= AddChatLine;
 			Game.BeforeGameStart -= UnregisterEvents;
 
-			if (world.LocalPlayer != null)
+			if (queueTabs != null)
 			{
-				var queueTabs = ingameRoot.GetWidget<ProductionTabsWidget>("PRODUCTION_TABS");
 				world.ActorAdded += queueTabs.ActorChanged;
 				world.ActorRemoved += queueTabs.ActorChanged;
 			}
 		}
 		
-		ProductionQueue QueueForType(World world, string type)
+		void SetupProductionGroupButton(ButtonWidget button, string group)
 		{
-			return world.ActorsWithTrait<ProductionQueue>()
+			button.IsDisabled = () => queueTabs.Groups[group].Tabs.Count == 0;
-				.Where(p => p.Actor.Owner == world.LocalPlayer)
+
-				.Select(p => p.Trait).FirstOrDefault(p => p.Info.Type == type);
+			button.OnMouseUp = mi =>
+			{
+				if (button.IsDisabled())
+					return true;
+
+				if (queueTabs.QueueType == group)
+					queueTabs.SelectNextTab(mi.Modifiers.HasModifier(Modifiers.Shift));
+				else
+					queueTabs.QueueType = group;
+
+				return true;
+			};
+
+			button.OnKeyPress = e =>
+			{
+				if (queueTabs.QueueType == group)
+					queueTabs.SelectNextTab(e.Modifiers.HasModifier(Modifiers.Shift));
+				else
+					queueTabs.QueueType = group;
+			};
 		}
 		
 		[ObjectCreator.UseCtor]
@@ -83,34 +102,18 @@ namespace OpenRA.Mods.Cnc.Widgets.Logic
 				sidebarRoot.GetWidget<LabelWidget>("CASH_DISPLAY").GetText = () =>
 					"${0}".F(playerResources.DisplayCash + playerResources.DisplayOre);
 
-				var buildPalette = playerWidgets.GetWidget<ProductionPaletteWidget>("PRODUCTION_PALETTE");
+				queueTabs = playerWidgets.GetWidget<ProductionTabsWidget>("PRODUCTION_TABS");
-				var queueTabs = playerWidgets.GetWidget<ProductionTabsWidget>("PRODUCTION_TABS");
-
 				world.ActorAdded += queueTabs.ActorChanged;
 				world.ActorRemoved += queueTabs.ActorChanged;
 
 				var queueTypes = sidebarRoot.GetWidget("PRODUCTION_TYPES");
-
+				SetupProductionGroupButton(queueTypes.GetWidget<ButtonWidget>("BUILDING"), "Building");
-				var buildingTab = queueTypes.GetWidget<ButtonWidget>("BUILDING");
+				SetupProductionGroupButton(queueTypes.GetWidget<ButtonWidget>("DEFENSE"), "Defense");
-				buildingTab.OnClick = () => queueTabs.QueueType = "Building";
+				SetupProductionGroupButton(queueTypes.GetWidget<ButtonWidget>("INFANTRY"), "Infantry");
-				buildingTab.IsDisabled = () => queueTabs.Groups["Building"].Tabs.Count == 0;
+				SetupProductionGroupButton(queueTypes.GetWidget<ButtonWidget>("VEHICLE"), "Vehicle");
-
+				SetupProductionGroupButton(queueTypes.GetWidget<ButtonWidget>("AIRCRAFT"), "Aircraft");
-				var defenseTab = queueTypes.GetWidget<ButtonWidget>("DEFENSE");
-				defenseTab.OnClick = () => queueTabs.QueueType = "Defense";
-				defenseTab.IsDisabled = () => queueTabs.Groups["Defense"].Tabs.Count == 0;
-
-				var infantryTab = queueTypes.GetWidget<ButtonWidget>("INFANTRY");
-				infantryTab.OnClick = () => queueTabs.QueueType = "Infantry";
-				infantryTab.IsDisabled = () => queueTabs.Groups["Infantry"].Tabs.Count == 0;
-
-				var vehicleTab = queueTypes.GetWidget<ButtonWidget>("VEHICLE");
-				vehicleTab.OnClick = () => queueTabs.QueueType = "Vehicle";
-				vehicleTab.IsDisabled = () => queueTabs.Groups["Vehicle"].Tabs.Count == 0;
-
-				var aircraftTab = queueTypes.GetWidget<ButtonWidget>("AIRCRAFT");
-				aircraftTab.OnClick = () => queueTabs.QueueType = "Aircraft";
-				aircraftTab.IsDisabled = () => queueTabs.Groups["Aircraft"].Tabs.Count == 0;
 			}
+
 			ingameRoot.GetWidget<ButtonWidget>("OPTIONS_BUTTON").OnClick = () =>
 			{
 				if (menu != MenuType.None)

OpenRA.Mods.Cnc/Widgets/ProductionTabsWidget.cs

@@ -90,7 +90,7 @@ namespace OpenRA.Mods.Cnc.Widgets
 		readonly World world;
 
 		[ObjectCreator.UseCtor]
-		public ProductionTabsWidget( [ObjectCreator.Param] World world )
+		public ProductionTabsWidget([ObjectCreator.Param] World world)
 		{
 			this.world = world;
 			Groups = Rules.Info.Values.SelectMany(a => a.Traits.WithInterface<ProductionQueueInfo>())
@@ -213,6 +213,33 @@ namespace OpenRA.Mods.Cnc.Widgets
 			return (leftPressed || rightPressed);
 		}
 
+		public override bool HandleKeyPressInner(KeyInput e)
+		{
+			if (e.Event != KeyInputEvent.Down) return false;
+			if (e.KeyName == "tab")
+			{
+				SelectNextTab(e.Modifiers.HasModifier(Modifiers.Shift));
+				return true;
+			}
+
+			return false;
+		}
+
+		public void SelectNextTab(bool reverse)
+		{
+			if (queueType == null)
+				return;
+
+			var pal = Widget.RootWidget.GetWidget<ProductionPaletteWidget>(PaletteWidget);
+			var tabs = Groups[queueType].Tabs.ToList();
+			if (reverse) tabs.Reverse();
+
+			var tab = tabs.SkipWhile(q => q.Queue != pal.CurrentQueue)
+				.Skip(1).FirstOrDefault() ?? tabs.FirstOrDefault();
+
+			pal.CurrentQueue = tab != null ? tab.Queue : null;
+		}
+
 		public void SelectQueue(ProductionQueue queue)
 		{
 			QueueType = queue.Info.Group;

mods/cnc/chrome/ingame.yaml

@@ -185,30 +185,35 @@ Container@INGAME_ROOT:
 									Width:30
 									Height:30
 									Text: B
+									Key: y
 								Button@DEFENSE:
 									Id:DEFENSE
 									X:35
 									Width:30
 									Height:30
 									Text: D
+									Key: u
 								Button@INFANTRY:
 									Id:INFANTRY
 									X:70
 									Width:30
 									Height:30
 									Text: I
+									Key: i
 								Button@VEHICLE:
 									Id:VEHICLE
 									X:105
 									Width:30
 									Height:30
 									Text: V
+									Key: o
 								Button@AIRCRAFT:
 									Id:AIRCRAFT
 									X:140
 									Width:30
 									Height:30
 									Text: H
+									Key: p
 				ProductionTabs:
 					Id:PRODUCTION_TABS
 					PaletteWidget:PRODUCTION_PALETTE