osu-lazer/osu.Game.Rulesets.Osu/Edit/Blueprints/Sliders/SliderEndDragMarker.cs

// 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;
using osu.Framework.Allocation;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Lines;
using osu.Framework.Input.Events;
using osu.Framework.Utils;
using osu.Game.Graphics;
using osu.Game.Rulesets.Osu.Objects;
using osuTK;

namespace osu.Game.Rulesets.Osu.Edit.Blueprints.Sliders
{
    public partial class SliderEndDragMarker : SmoothPath
    {
        public Action<DragStartEvent>? StartDrag { get; set; }
        public Action<DragEvent>? Drag { get; set; }
        public Action? EndDrag { get; set; }

        [Resolved]
        private OsuColour colours { get; set; } = null!;

        [BackgroundDependencyLoader]
        private void load()
        {
            var path = PathApproximator.CircularArcToPiecewiseLinear([
                new Vector2(0, OsuHitObject.OBJECT_RADIUS),
                new Vector2(OsuHitObject.OBJECT_RADIUS, 0),
                new Vector2(0, -OsuHitObject.OBJECT_RADIUS)
            ]);

            Anchor = Anchor.CentreLeft;
            Origin = Anchor.CentreLeft;
            PathRadius = 5;
            Vertices = path;
        }

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

        protected override bool OnHover(HoverEvent e)
        {
            updateState();
            return true;
        }

        protected override void OnHoverLost(HoverLostEvent e)
        {
            updateState();
            base.OnHoverLost(e);
        }

        protected override bool OnDragStart(DragStartEvent e)
        {
            updateState();
            StartDrag?.Invoke(e);
            return true;
        }

        protected override void OnDrag(DragEvent e)
        {
            updateState();
            base.OnDrag(e);
            Drag?.Invoke(e);
        }

        protected override void OnDragEnd(DragEndEvent e)
        {
            updateState();
            EndDrag?.Invoke();
            base.OnDragEnd(e);
        }

        private void updateState()
        {
            Colour = IsHovered || IsDragged ? colours.Red : colours.Yellow;
        }
    }
}