Move selection hotkeys out of world interaction widget

- Split SelectionUtils for selecting actors in the world to a static class
- Split selection hotkeys into their own logic classes

OpenRA.Mods.Common/Widgets/Logic/Ingame/Hotkeys/SelectAllUnitsHotkeyLogic.cs

@@ -0,0 +1,66 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2021 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using System.Linq;
+using OpenRA.Graphics;
+using OpenRA.Mods.Common.Lint;
+using OpenRA.Traits;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.Common.Widgets.Logic.Ingame
+{
+	[ChromeLogicArgsHotkeys("SelectAllUnitsKey")]
+	public class SelectAllUnitsHotkeyLogic : SingleHotkeyBaseLogic
+	{
+		readonly World world;
+		readonly WorldRenderer worldRenderer;
+		readonly ISelection selection;
+
+		public readonly string ClickSound = ChromeMetrics.Get<string>("ClickSound");
+
+		[ObjectCreator.UseCtor]
+		public SelectAllUnitsHotkeyLogic(Widget widget, ModData modData, WorldRenderer worldRenderer, World world, Dictionary<string, MiniYaml> logicArgs)
+			: base(widget, modData, "SelectAllUnitsKey", "WORLD_KEYHANDLER", logicArgs)
+		{
+			this.world = world;
+			this.worldRenderer = worldRenderer;
+			selection = world.Selection;
+		}
+
+		protected override bool OnHotkeyActivated(KeyInput e)
+		{
+			if (world.IsGameOver)
+				return false;
+
+			var eligiblePlayers = SelectionUtils.GetPlayersToIncludeInSelection(world);
+
+			// Select actors on the screen which belong to the current player(s)
+			var ownUnitsOnScreen = SelectionUtils.SelectActorsOnScreen(world, worldRenderer, null, eligiblePlayers).SubsetWithHighestSelectionPriority(e.Modifiers).ToList();
+
+			// Check if selecting actors on the screen has selected new units
+			if (ownUnitsOnScreen.Count > selection.Actors.Count())
+				TextNotificationsManager.AddFeedbackLine("Selected across screen.");
+			else
+			{
+				// Select actors in the world that have highest selection priority
+				ownUnitsOnScreen = SelectionUtils.SelectActorsInWorld(world, null, eligiblePlayers).SubsetWithHighestSelectionPriority(e.Modifiers).ToList();
+				TextNotificationsManager.AddFeedbackLine("Selected across map.");
+			}
+
+			selection.Combine(world, ownUnitsOnScreen, false, false);
+
+			Game.Sound.PlayNotification(world.Map.Rules, world.LocalPlayer, "Sounds", ClickSound, null);
+
+			return true;
+		}
+	}
+}