Add a mission objectives GUI panel

OpenRA.Mods.RA/Widgets/Logic/Ingame/GameInfoBriefingLogic.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 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. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Linq;
+using OpenRA.Widgets;
+using OpenRA.Traits;
+using OpenRA.Mods.RA;
+
+namespace OpenRA.Mods.RA.Widgets.Logic
+{
+	class GameInfoBriefingLogic
+	{
+		[ObjectCreator.UseCtor]
+		public GameInfoBriefingLogic(Widget widget, World world)
+		{
+			var previewWidget = widget.Get<MapPreviewWidget>("MAP_PREVIEW");
+			previewWidget.Preview = () => Game.modData.MapCache[world.Map.Uid];
+
+			var mapDescriptionPanel = widget.Get<ScrollPanelWidget>("MAP_DESCRIPTION_PANEL");
+			var mapDescription = widget.Get<LabelWidget>("MAP_DESCRIPTION");
+			var mapFont = Game.Renderer.Fonts[mapDescription.Font];
+			var text = world.Map.Description != null ? world.Map.Description.Replace("\\n", "\n") : "";
+			text = WidgetUtils.WrapText(text, mapDescription.Bounds.Width, mapFont);
+			mapDescription.Text = text;
+			mapDescription.Bounds.Height = mapFont.Measure(text).Y;
+			mapDescriptionPanel.ScrollToTop();
+			mapDescriptionPanel.Layout.AdjustChildren();
+		}
+	}
+}