Display performance breakdown in a tooltip

osu.Game/Rulesets/Difficulty/PerformanceDisplayAttribute.cs

@@ -0,0 +1,26 @@
+// 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.
+namespace osu.Game.Rulesets.Difficulty
+{
+    /// <summary>
+    /// Data for displaying a performance attribute to user. Includes a display name for clarity.
+    /// </summary>
+    public class PerformanceDisplayAttribute
+    {
+        /// <summary>
+        /// A custom display name for the attribute.
+        /// </summary>
+        public string DisplayName { get; }
+
+        /// <summary>
+        /// The associated attribute value.
+        /// </summary>
+        public double Value { get; }
+
+        public PerformanceDisplayAttribute(string displayName, double value)
+        {
+            DisplayName = displayName;
+            Value = value;
+        }
+    }
+}