From e49ec092c9a35f2aa414102153829aa4ea221402 Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Fri, 2 Oct 2020 16:08:11 +0900
Subject: [PATCH] Expose ability to register a component as an import handler

---
 osu.Game/OsuGameBase.cs | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/osu.Game/OsuGameBase.cs b/osu.Game/OsuGameBase.cs
index b1269e9300..11c1f6c5cf 100644
--- a/osu.Game/OsuGameBase.cs
+++ b/osu.Game/OsuGameBase.cs
@@ -232,9 +232,9 @@ namespace osu.Game
             dependencies.Cache(new SessionStatics());
             dependencies.Cache(new OsuColour());
 
-            fileImporters.Add(BeatmapManager);
-            fileImporters.Add(ScoreManager);
-            fileImporters.Add(SkinManager);
+            RegisterImportHandler(BeatmapManager);
+            RegisterImportHandler(ScoreManager);
+            RegisterImportHandler(SkinManager);
 
             // tracks play so loud our samples can't keep up.
             // this adds a global reduction of track volume for the time being.
@@ -341,7 +341,19 @@ namespace osu.Game
 
         protected override Storage CreateStorage(GameHost host, Storage defaultStorage) => new OsuStorage(host, defaultStorage);
 
-        private readonly List<ICanAcceptFiles> fileImporters = new List<ICanAcceptFiles>();
+        private readonly HashSet<ICanAcceptFiles> fileImporters = new HashSet<ICanAcceptFiles>();
+
+        /// <summary>
+        /// Register a global handler for file imports.
+        /// </summary>
+        /// <param name="handler">The handler to register.</param>
+        public void RegisterImportHandler(ICanAcceptFiles handler) => fileImporters.Add(handler);
+
+        /// <summary>
+        /// Unregister a global handler for file imports.
+        /// </summary>
+        /// <param name="handler">The previously registered handler.</param>
+        public void UnregisterImportHandler(ICanAcceptFiles handler) => fileImporters.Remove(handler);
 
         public async Task Import(params string[] paths)
         {