Allow mod to be launched after installing required content.

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

@@ -10,6 +10,7 @@
 #endregion
 
 using System;
+using System.IO;
 using System.Linq;
 using OpenRA.FileSystem;
 using OpenRA.Widgets;
@@ -19,11 +20,16 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 {
 	public class ModContentPromptLogic : ChromeLogic
 	{
+		readonly ModContent content;
+		bool requiredContentInstalled;
+
 		[ObjectCreator.UseCtor]
 		public ModContentPromptLogic(Widget widget, ModData modData, Manifest mod, ModContent content, Action continueLoading)
 		{
-			var panel = widget.Get("CONTENT_PROMPT_PANEL");
+			this.content = content;
+			CheckRequiredContentInstalled();
 
+			var panel = widget.Get("CONTENT_PROMPT_PANEL");
 			var headerTemplate = panel.Get<LabelWidget>("HEADER_TEMPLATE");
 			var headerLines = !string.IsNullOrEmpty(content.InstallPromptMessage) ? content.InstallPromptMessage.Replace("\\n", "\n").Split('\n') : new string[0];
 			var headerHeight = 0;
@@ -48,7 +54,7 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 				{
 					{ "mod", mod },
 					{ "content", content },
-					{ "onCancel", () => { } }
+					{ "onCancel", CheckRequiredContentInstalled }
 				});
 			};
 
@@ -77,9 +83,24 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 			};
 
 			var quitButton = panel.Get<ButtonWidget>("QUIT_BUTTON");
+			quitButton.GetText = () => requiredContentInstalled ? "Continue" : "Quit";
 			quitButton.Bounds.Y += headerHeight;
-			quitButton.OnClick = Game.Exit;
+			quitButton.OnClick = () =>
+			{
+				if (requiredContentInstalled)
+					continueLoading();
+				else
+					Game.Exit();
+			};
+
 			Game.RunAfterTick(Ui.ResetTooltips);
 		}
+
+		void CheckRequiredContentInstalled()
+		{
+			requiredContentInstalled = content.Packages
+				.Where(p => p.Value.Required)
+				.All(p => p.Value.TestFiles.All(f => File.Exists(Platform.ResolvePath(f))));
+		}
 	}
 }