Add StableImportManager

osu.Game/Overlays/Settings/Sections/Maintenance/StableDirectorySelectScreen.cs

@@ -0,0 +1,42 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using osu.Framework.Screens;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Sprites;
+
+namespace osu.Game.Overlays.Settings.Sections.Maintenance
+{
+    public class StableDirectorySelectScreen : DirectorySelectScreen
+    {
+        private readonly TaskCompletionSource<string> taskCompletionSource;
+
+        protected override bool IsValidDirectory(DirectoryInfo info) => info?.GetFiles("osu!.*.cfg").Any() ?? false;
+
+        protected override OsuSpriteText CreateHeader() => new OsuSpriteText
+        {
+            Text = "Please select stable location",
+            Font = OsuFont.Default.With(size: 40)
+        };
+
+        public StableDirectorySelectScreen(TaskCompletionSource<string> taskCompletionSource)
+        {
+            this.taskCompletionSource = taskCompletionSource;
+        }
+
+        protected override void OnSelection(DirectoryInfo directory)
+        { 
+            taskCompletionSource.TrySetResult(directory.FullName);
+            this.Exit();
+        }
+
+        public override bool OnBackButton()
+        {
+            taskCompletionSource.TrySetCanceled();
+            return base.OnBackButton();
+        }
+    }
+}