osu-lazer/osu.Game/Screens/Select/Carousel/CarouselBeatmapSet.cs

// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using System;
using System.Collections.Generic;
using System.Linq;
using osu.Framework.Extensions.IEnumerableExtensions;
using osu.Game.Beatmaps;
using osu.Game.Screens.Select.Filter;

namespace osu.Game.Screens.Select.Carousel
{
    public class CarouselBeatmapSet : CarouselGroupEagerSelect
    {
        public IEnumerable<CarouselBeatmap> Beatmaps => InternalChildren.OfType<CarouselBeatmap>();

        public BeatmapSetInfo BeatmapSet;

        public CarouselBeatmapSet(BeatmapSetInfo beatmapSet)
        {
            BeatmapSet = beatmapSet ?? throw new ArgumentNullException(nameof(beatmapSet));

            beatmapSet.Beatmaps
                      .Where(b => !b.Hidden)
                      .Select(b => new CarouselBeatmap(b))
                      .ForEach(AddChild);
        }

        protected override DrawableCarouselItem CreateDrawableRepresentation() => new DrawableCarouselBeatmapSet(this);

        public override int CompareTo(FilterCriteria criteria, CarouselItem other)
        {
            if (!(other is CarouselBeatmapSet otherSet))
                return base.CompareTo(criteria, other);

            switch (criteria.Sort)
            {
                default:
                case SortMode.Artist:
                    return string.Compare(BeatmapSet.Metadata.Artist, otherSet.BeatmapSet.Metadata.Artist, StringComparison.InvariantCultureIgnoreCase);
                case SortMode.Title:
                    return string.Compare(BeatmapSet.Metadata.Title, otherSet.BeatmapSet.Metadata.Title, StringComparison.InvariantCultureIgnoreCase);
                case SortMode.Author:
                    return string.Compare(BeatmapSet.Metadata.Author.Username, otherSet.BeatmapSet.Metadata.Author.Username, StringComparison.InvariantCultureIgnoreCase);
                case SortMode.Difficulty:
                    return BeatmapSet.MaxStarDifficulty.CompareTo(otherSet.BeatmapSet.MaxStarDifficulty);
            }
        }

        public override void Filter(FilterCriteria criteria)
        {
            base.Filter(criteria);
            Filtered.Value = InternalChildren.All(i => i.Filtered);
        }

        public override string ToString() => BeatmapSet.ToString();
    }
}