Add new content installer framework.

OpenRA.Mods.Common/Widgets/Logic/Installation/ModContentDiscTooltipLogic.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2016 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;
+using System.IO;
+using System.Linq;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.Common.Widgets.Logic
+{
+	public class ModContentDiscTooltipLogic : ChromeLogic
+	{
+		[ObjectCreator.UseCtor]
+		public ModContentDiscTooltipLogic(Widget widget, Func<string> getText)
+		{
+			var discs = widget.Get<ContainerWidget>("DISCS");
+			var template = discs.Get<LabelWidget>("DISC_TEMPLATE");
+			discs.RemoveChildren();
+
+			var desc = widget.Get<LabelWidget>("DESCRIPTION");
+
+			var font = Game.Renderer.Fonts[template.Font];
+			var discTitles = getText().Split('\n');
+
+			var maxWidth = 0;
+			var sideMargin = desc.Bounds.X;
+			var bottomMargin = discs.Bounds.Height;
+			foreach (var disc in discTitles)
+			{
+				var label = (LabelWidget)template.Clone();
+				var title = disc;
+				label.GetText = () => title;
+				label.Bounds.Y = discs.Bounds.Height;
+				label.Bounds.Width = font.Measure(disc).X;
+
+				maxWidth = Math.Max(maxWidth, label.Bounds.Width + label.Bounds.X);
+				discs.AddChild(label);
+				discs.Bounds.Height += label.Bounds.Height;
+			}
+
+			widget.Bounds.Width = 2 * sideMargin + maxWidth;
+			widget.Bounds.Height = discs.Bounds.Y + bottomMargin + discs.Bounds.Height;
+		}
+	}
+}