Add new display for difficulty row attribute

osu.Game/Screens/Edit/Timing/ControlPointTable.cs

@@ -138,7 +138,7 @@ namespace osu.Game.Screens.Edit.Timing
                         return new TimingRowAttribute(timing);
 
                     case DifficultyControlPoint difficulty:
-                        return new EmptyRowAttribute("difficulty", () => $"{difficulty.SpeedMultiplier:n2}x", colour);
+                        return new DifficultyRowAttribute(difficulty);
 
                     case EffectControlPoint effect:
                         return new EmptyRowAttribute("effect", () => string.Join(" ",

osu.Game/Screens/Edit/Timing/RowAttribute.cs

@@ -15,14 +15,16 @@ namespace osu.Game.Screens.Edit.Timing
 {
     public class RowAttribute : CompositeDrawable
     {
-        private readonly ControlPoint point;
+        protected readonly ControlPoint Point;
+
         private readonly string label;
 
         protected FillFlowContainer Content { get; private set; }
 
         public RowAttribute(ControlPoint point, string label)
         {
-            this.point = point;
+            Point = point;
+
             this.label = label;
         }
 
@@ -65,7 +67,7 @@ namespace osu.Game.Screens.Edit.Timing
                             {
                                 new Box
                                 {
-                                    Colour = point.GetRepresentingColour(colours),
+                                    Colour = Point.GetRepresentingColour(colours),
                                     RelativeSizeAxes = Axes.Both,
                                 },
                                 new OsuSpriteText

osu.Game/Screens/Edit/Timing/RowAttributes/AttributeProgressBar.cs

@@ -0,0 +1,41 @@
+// 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.Allocation;
+using osu.Framework.Graphics;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Graphics;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Overlays;
+using osuTK;
+
+namespace osu.Game.Screens.Edit.Timing.RowAttributes
+{
+    public class AttributeProgressBar : ProgressBar
+    {
+        private readonly ControlPoint controlPoint;
+
+        public AttributeProgressBar(ControlPoint controlPoint)
+            : base(false)
+        {
+            this.controlPoint = controlPoint;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours, OverlayColourProvider overlayColours)
+        {
+            Anchor = Anchor.CentreLeft;
+            Origin = Anchor.CentreLeft;
+
+            Masking = true;
+
+            RelativeSizeAxes = Axes.None;
+
+            Size = new Vector2(80, 8);
+            CornerRadius = Height / 2;
+
+            BackgroundColour = overlayColours.Background6;
+            Colour = controlPoint.GetRepresentingColour(colours);
+        }
+    }
+}

osu.Game/Screens/Edit/Timing/RowAttributes/DifficultyRowAttribute.cs

@@ -0,0 +1,48 @@
+// 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.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Sprites;
+
+namespace osu.Game.Screens.Edit.Timing.RowAttributes
+{
+    public class DifficultyRowAttribute : RowAttribute
+    {
+        private readonly BindableNumber<double> speedMultiplier;
+
+        private OsuSpriteText text;
+
+        public DifficultyRowAttribute(DifficultyControlPoint difficulty)
+            : base(difficulty, "difficulty")
+        {
+            speedMultiplier = difficulty.SpeedMultiplierBindable.GetBoundCopy();
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            Content.AddRange(new Drawable[]
+            {
+                text = new OsuSpriteText
+                {
+                    Anchor = Anchor.CentreLeft,
+                    Origin = Anchor.CentreLeft,
+                    Width = 40,
+                    Font = OsuFont.GetFont(size: EditorTable.TEXT_SIZE, weight: FontWeight.Regular),
+                },
+                new AttributeProgressBar(Point)
+                {
+                    Current = speedMultiplier,
+                }
+            });
+
+            speedMultiplier.BindValueChanged(_ => updateText(), true);
+        }
+
+        private void updateText() => text.Text = $"{speedMultiplier.Value:n2}x";
+    }
+}