Separate out timeline control point display from summary timeline display

osu.Game/Screens/Edit/Compose/Components/Timeline/DifficultyPointPiece.cs

@@ -0,0 +1,66 @@
+// 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.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Sprites;
+using osuTK.Graphics;
+
+namespace osu.Game.Screens.Edit.Compose.Components.Timeline
+{
+    public class DifficultyPointPiece : CompositeDrawable
+    {
+        private OsuSpriteText speedMultiplierText;
+        private readonly BindableNumber<double> speedMultiplier;
+
+        public DifficultyPointPiece(DifficultyControlPoint point)
+        {
+            speedMultiplier = point.SpeedMultiplierBindable.GetBoundCopy();
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            RelativeSizeAxes = Axes.Y;
+            AutoSizeAxes = Axes.X;
+
+            Color4 colour = colours.GreenDark;
+
+            InternalChildren = new Drawable[]
+            {
+                new Box
+                {
+                    Colour = colour,
+                    Width = 2,
+                    RelativeSizeAxes = Axes.Y,
+                },
+                new Container
+                {
+                    Anchor = Anchor.BottomLeft,
+                    Origin = Anchor.BottomLeft,
+                    AutoSizeAxes = Axes.Both,
+                    Children = new Drawable[]
+                    {
+                        new Box
+                        {
+                            Colour = colour,
+                            RelativeSizeAxes = Axes.Both,
+                        },
+                        speedMultiplierText = new OsuSpriteText
+                        {
+                            Font = OsuFont.Default.With(weight: FontWeight.Bold),
+                            Colour = Color4.White,
+                        }
+                    }
+                },
+            };
+
+            speedMultiplier.BindValueChanged(multiplier => speedMultiplierText.Text = $"{multiplier.NewValue:n2}x", true);
+        }
+    }
+}

osu.Game/Screens/Edit/Compose/Components/Timeline/Timeline.cs

@@ -13,7 +13,6 @@ using osu.Framework.Input.Events;
 using osu.Game.Beatmaps;
 using osu.Game.Graphics;
 using osu.Game.Rulesets.Edit;
-using osu.Game.Screens.Edit.Components.Timelines.Summary.Parts;
 using osuTK;
 
 namespace osu.Game.Screens.Edit.Compose.Components.Timeline
@@ -63,9 +62,11 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
         }
 
         private WaveformGraph waveform;
-        private ControlPointPart controlPoints;
+
         private TimelineTickDisplay ticks;
 
+        private TimelineControlPointDisplay controlPoints;
+
         [BackgroundDependencyLoader]
         private void load(IBindable<WorkingBeatmap> beatmap, OsuColour colours)
         {
@@ -85,10 +86,7 @@ namespace osu.Game.Screens.Edit.Compose.Components.Timeline
                             MidColour = colours.BlueDark,
                             HighColour = colours.BlueDarker,
                         },
-                        controlPoints = new ControlPointPart
+                        controlPoints = new TimelineControlPointDisplay(),
-                        {
-                            RelativeSizeAxes = Axes.Both
-                        },
                         ticks = new TimelineTickDisplay(),
                     }
                 },

osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineControlPointDisplay.cs

@@ -0,0 +1,57 @@
+// 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.Collections.Specialized;
+using System.Linq;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Screens.Edit.Components.Timelines.Summary.Parts;
+
+namespace osu.Game.Screens.Edit.Compose.Components.Timeline
+{
+    /// <summary>
+    /// The part of the timeline that displays the control points.
+    /// </summary>
+    public class TimelineControlPointDisplay : TimelinePart<TimelineControlPointGroup>
+    {
+        private IBindableList<ControlPointGroup> controlPointGroups;
+
+        public TimelineControlPointDisplay()
+        {
+            RelativeSizeAxes = Axes.Both;
+        }
+
+        protected override void LoadBeatmap(WorkingBeatmap beatmap)
+        {
+            base.LoadBeatmap(beatmap);
+
+            controlPointGroups = beatmap.Beatmap.ControlPointInfo.Groups.GetBoundCopy();
+            controlPointGroups.BindCollectionChanged((sender, args) =>
+            {
+                switch (args.Action)
+                {
+                    case NotifyCollectionChangedAction.Reset:
+                        Clear();
+                        break;
+
+                    case NotifyCollectionChangedAction.Add:
+                        foreach (var group in args.NewItems.OfType<ControlPointGroup>())
+                            Add(new TimelineControlPointGroup(group));
+                        break;
+
+                    case NotifyCollectionChangedAction.Remove:
+                        foreach (var group in args.OldItems.OfType<ControlPointGroup>())
+                        {
+                            var matching = Children.SingleOrDefault(gv => gv.Group == group);
+
+                            matching?.Expire();
+                        }
+
+                        break;
+                }
+            }, true);
+        }
+    }
+}

osu.Game/Screens/Edit/Compose/Components/Timeline/TimelineControlPointGroup.cs

@@ -0,0 +1,55 @@
+// 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.Framework.Graphics.Containers;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Graphics;
+
+namespace osu.Game.Screens.Edit.Compose.Components.Timeline
+{
+    public class TimelineControlPointGroup : CompositeDrawable
+    {
+        public readonly ControlPointGroup Group;
+
+        private BindableList<ControlPoint> controlPoints;
+
+        [Resolved]
+        private OsuColour colours { get; set; }
+
+        public TimelineControlPointGroup(ControlPointGroup group)
+        {
+            Origin = Anchor.TopCentre;
+
+            Group = group;
+
+            RelativePositionAxes = Axes.X;
+            RelativeSizeAxes = Axes.Y;
+
+            Width = 1;
+
+            X = (float)group.Time;
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            controlPoints = (BindableList<ControlPoint>)Group.ControlPoints.GetBoundCopy();
+            controlPoints.BindCollectionChanged((_, __) =>
+            {
+                foreach (var point in controlPoints)
+                {
+                    switch (point)
+                    {
+                        case DifficultyControlPoint difficultyPoint:
+                            AddInternal(new DifficultyPointPiece(difficultyPoint));
+                            break;
+                    }
+                }
+            }, true);
+        }
+    }
+}