osukey/osu.Game/Screens/Edit/Timing/TimingSection.cs

using osu.Framework.Allocation;
using osu.Game.Beatmaps.ControlPoints;
using osu.Game.Graphics.Sprites;

namespace osu.Game.Screens.Edit.Timing
{
    internal class TimingSection : Section<TimingControlPoint>
    {
        private OsuSpriteText bpm;
        private OsuSpriteText timeSignature;

        [BackgroundDependencyLoader]
        private void load()
        {
            Flow.AddRange(new[]
            {
                bpm = new OsuSpriteText(),
                timeSignature = new OsuSpriteText(),
            });
        }

        protected override void LoadComplete()
        {
            base.LoadComplete();

            ControlPoint.BindValueChanged(point =>
            {
                bpm.Text = $"BPM: {point.NewValue?.BeatLength}";
                timeSignature.Text = $"Signature: {point.NewValue?.TimeSignature}";
            });
        }

        protected override TimingControlPoint CreatePoint()
        {
            var reference = Beatmap.Value.Beatmap.ControlPointInfo.TimingPointAt(SelectedGroup.Value.Time);

            return new TimingControlPoint
            {
                BeatLength = reference.BeatLength,
                TimeSignature = reference.TimeSignature
            };
        }
    }
}