Add ability to set preview time

osu.Game/Screens/Edit/Components/Timelines/Summary/Parts/PreviewTimePart.cs

@@ -0,0 +1,31 @@
+// 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.Game.Graphics;
+using osu.Game.Screens.Edit.Components.Timelines.Summary.Visualisations;
+
+namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
+{
+    public partial class PreviewTimePart : TimelinePart
+    {
+        protected override void LoadBeatmap(EditorBeatmap beatmap)
+        {
+            base.LoadBeatmap(beatmap);
+            Add(new PreviewTimeVisualisation(beatmap.PreviewTime));
+        }
+
+        private partial class PreviewTimeVisualisation : PointVisualisation
+        {
+            public PreviewTimeVisualisation(BindableInt time)
+                : base(time.Value)
+            {
+                time.BindValueChanged(s => X = s.NewValue);
+            }
+
+            [BackgroundDependencyLoader]
+            private void load(OsuColour colours) => Colour = colours.Lime;
+        }
+    }
+}

osu.Game/Screens/Edit/Components/Timelines/Summary/SummaryTimeline.cs

@@ -41,6 +41,14 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary
                     RelativeSizeAxes = Axes.Both,
                     Height = 0.35f
                 },
+                new PreviewTimePart
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.BottomCentre,
+                    RelativeSizeAxes = Axes.Both,
+                    Y = -10,
+                    Height = 0.35f
+                },
                 new Container
                 {
                     Name = "centre line",

osu.Game/Screens/Edit/Editor.cs

@@ -322,6 +322,13 @@ namespace osu.Game.Screens.Edit
                                                 State = { BindTarget = editorHitMarkers },
                                             }
                                         }
+                                    },
+                                    new MenuItem("Timing")
+                                    {
+                                        Items = new MenuItem[]
+                                        {
+                                            new EditorMenuItem("Set Current Position as Preview Point", MenuItemType.Standard, SetCurrectTimeAsPreview)
+                                        }
                                     }
                                 }
                             },
@@ -801,6 +808,11 @@ namespace osu.Game.Screens.Edit
 
         protected void Redo() => changeHandler?.RestoreState(1);
 
+        protected void SetCurrectTimeAsPreview()
+        {
+            editorBeatmap.PreviewTime.Value = (int)clock.CurrentTime;
+        }
+
         private void resetTrack(bool seekToStart = false)
         {
             Beatmap.Value.Track.Stop();

osu.Game/Screens/Edit/EditorBeatmap.cs

@@ -86,6 +86,8 @@ namespace osu.Game.Screens.Edit
         [Resolved]
         private EditorClock editorClock { get; set; }
 
+        public BindableInt PreviewTime;
+
         private readonly IBeatmapProcessor beatmapProcessor;
 
         private readonly Dictionary<HitObject, Bindable<double>> startTimeBindables = new Dictionary<HitObject, Bindable<double>>();
@@ -107,6 +109,9 @@ namespace osu.Game.Screens.Edit
 
             foreach (var obj in HitObjects)
                 trackStartTime(obj);
+
+            PreviewTime = new BindableInt(playableBeatmap.Metadata.PreviewTime);
+            PreviewTime.BindValueChanged(s => this.beatmapInfo.Metadata.PreviewTime = s.NewValue);
         }
 
         /// <summary>