Implement new viewport size/zoom UI.

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

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2019 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 OpenRA.Graphics;
+using OpenRA.Mods.Common.Lint;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.Common.Widgets.Logic.Ingame
+{
+	[ChromeLogicArgsHotkeys("ResetZoomKey")]
+	public class ResetZoomHotkeyLogic : SingleHotkeyBaseLogic
+	{
+		readonly Viewport viewport;
+
+		[ObjectCreator.UseCtor]
+		public ResetZoomHotkeyLogic(Widget widget, ModData modData, WorldRenderer worldRenderer, Dictionary<string, MiniYaml> logicArgs)
+			: base(widget, modData, "ResetZoomKey", "WORLD_KEYHANDLER", logicArgs)
+		{
+			viewport = worldRenderer.Viewport;
+		}
+
+		protected override bool OnHotkeyActivated(KeyInput e)
+		{
+			viewport.ToggleZoom();
+
+			return true;
+		}
+	}
+}