Move ModContent out of the engine.

OpenRA.Mods.Common/LoadScreens/BlankLoadScreen.cs

@@ -12,6 +12,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using OpenRA.FileFormats;
 using OpenRA.Mods.Common.Widgets.Logic;
 using OpenRA.Widgets;
@@ -21,8 +22,12 @@ namespace OpenRA.Mods.Common.LoadScreens
 	public class BlankLoadScreen : ILoadScreen
 	{
 		public LaunchArguments Launch;
+		ModData modData;
 
-		public virtual void Init(ModData m, Dictionary<string, string> info) { }
+		public virtual void Init(ModData modData, Dictionary<string, string> info)
+		{
+			this.modData = modData;
+		}
 
 		public virtual void Display()
 		{
@@ -97,5 +102,13 @@ namespace OpenRA.Mods.Common.LoadScreens
 			Dispose(true);
 			GC.SuppressFinalize(this);
 		}
+
+		public bool RequiredContentIsInstalled()
+		{
+			var content = modData.Manifest.Get<ModContent>();
+			return content.Packages
+				.Where(p => p.Value.Required)
+				.All(p => p.Value.TestFiles.All(f => File.Exists(Platform.ResolvePath(f))));
+		}
 	}
 }

OpenRA.Mods.Common/LoadScreens/LogoStripeLoadScreen.cs

@@ -31,6 +31,8 @@ namespace OpenRA.Mods.Common.LoadScreens
 
 		public override void Init(ModData modData, Dictionary<string, string> info)
 		{
+			base.Init(modData, info);
+
 			// Avoid standard loading mechanisms so we
 			// can display the loadscreen as early as possible
 			r = Game.Renderer;

OpenRA.Mods.Common/LoadScreens/ModChooserLoadScreen.cs

@@ -11,7 +11,6 @@
 
 using System.Collections.Generic;
 using System.Drawing;
-using System.IO;
 using OpenRA.Graphics;
 using OpenRA.Widgets;
 
@@ -58,5 +57,10 @@ namespace OpenRA.Mods.Common.LoadScreens
 			if (sprite != null)
 				sprite.Sheet.Dispose();
 		}
+
+		public bool RequiredContentIsInstalled()
+		{
+			return true;
+		}
 	}
 }