CommentEditor basic implementation

osu.Game.Tests/Visual/UserInterface/TestSceneCommentEditor.cs

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+// 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;
+using System.Collections.Generic;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Overlays;
+using osu.Game.Overlays.Comments;
+
+namespace osu.Game.Tests.Visual.UserInterface
+{
+    public class TestSceneCommentEditor : OsuTestScene
+    {
+        public override IReadOnlyList<Type> RequiredTypes => new[]
+        {
+            typeof(CommentEditor),
+        };
+
+        [Cached]
+        private readonly OverlayColourProvider colourProvider = new OverlayColourProvider(OverlayColourScheme.Blue);
+
+        public TestSceneCommentEditor()
+        {
+            Add(new Container
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                AutoSizeAxes = Axes.Y,
+                Width = 800,
+                Child = new TestCommentEditor()
+            });
+        }
+
+        private class TestCommentEditor : CommentEditor
+        {
+            protected override string EmptyTextboxText() => @"This textbox is empty";
+
+            protected override string FooterText() => @"Footer text. And it is pretty long. Cool.";
+        }
+    }
+}