add OsuMarkdownUnorderedListItem

osu.Game/Graphics/Containers/Markdown/OsuMarkdownUnorderedListItem.cs

@@ -0,0 +1,51 @@
+// 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 osu.Framework.Graphics;
+using osu.Framework.Graphics.Sprites;
+
+namespace osu.Game.Graphics.Containers.Markdown
+{
+    public class OsuMarkdownUnorderedListItem : OsuMarkdownListItem
+    {
+        private const float left_padding = 20;
+
+        private readonly int level;
+
+        public OsuMarkdownUnorderedListItem(int level)
+        {
+            this.level = level;
+
+            Padding = new MarginPadding { Left = left_padding };
+        }
+
+        protected override SpriteText CreateMarker() => base.CreateMarker().With(t =>
+        {
+            t.Text = GetTextMarker(level);
+            t.Font = t.Font.With(size: t.Font.Size / 2);
+            t.Origin = Anchor.Centre;
+            t.X = -left_padding / 2;
+            t.Y = t.Font.Size;
+        });
+
+        /// <summary>
+        /// Get text marker based on <paramref name="level"/>
+        /// </summary>
+        /// <param name="level">The markdown level of current list item.</param>
+        /// <returns></returns>
+        protected virtual string GetTextMarker(int level)
+        {
+            switch (level)
+            {
+                case 1:
+                    return "●";
+
+                case 2:
+                    return "○";
+
+                default:
+                    return "■";
+            }
+        }
+    }
+}