osu-lazer/osu.Game.Rulesets.Mania/UI/ManiaPlayfield.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 osu.Framework.Graphics;
using osu.Game.Rulesets.Mania.Objects;
using OpenTK;
using osu.Framework.Graphics.Containers;
using System;
using System.Collections.Generic;
using System.Linq;
using osu.Framework.Configuration;
using osu.Framework.Extensions.IEnumerableExtensions;
using osu.Game.Rulesets.Mania.Beatmaps;
using osu.Game.Rulesets.Objects.Drawables;
using osu.Game.Rulesets.UI.Scrolling;

namespace osu.Game.Rulesets.Mania.UI
{
    public class ManiaPlayfield : ScrollingPlayfield
    {
        /// <summary>
        /// <see cref="ManiaStage"/>s contained by this <see cref="ManiaPlayfield"/>.
        /// </summary>
        private readonly FillFlowContainer<ManiaStage> stages;

        /// <summary>
        /// Whether this playfield should be inverted. This flips everything inside the playfield.
        /// </summary>
        public readonly Bindable<bool> Inverted = new Bindable<bool>(true);

        /// <summary>
        /// The style to use for the special column.
        /// </summary>
        public Bindable<SpecialColumnPosition> SpecialColumnPosition = new Bindable<SpecialColumnPosition>();

        public List<Column> Columns => stages.SelectMany(x => x.Columns).ToList();

        public ManiaPlayfield(List<StageDefinition> stageDefinitions)
            : base(ScrollingDirection.Up)
        {
            if (stageDefinitions == null)
                throw new ArgumentNullException(nameof(stageDefinitions));

            if (stageDefinitions.Count <= 0)
                throw new ArgumentException("Can't have zero or fewer stages.");

            Inverted.Value = true;

            var stageSpacing = 300 / stageDefinitions.Count;

            InternalChildren = new Drawable[]
            {
                stages = new FillFlowContainer<ManiaStage>
                {
                    Name = "Stages",
                    Direction = FillDirection.Horizontal,
                    RelativeSizeAxes = Axes.Y,
                    Anchor = Anchor.Centre,
                    Origin = Anchor.Centre,
                    Spacing = new Vector2(stageSpacing),
                }
            };

            int firstColumnIndex = 0;
            for (int i = 0; i < stageDefinitions.Count; i++)
            {
                var newStage = new ManiaStage(i, firstColumnIndex, stageDefinitions[i]);
                newStage.SpecialColumn.BindTo(SpecialColumnPosition);
                newStage.VisibleTimeRange.BindTo(VisibleTimeRange);
                newStage.Inverted.BindTo(Inverted);

                stages.Add(newStage);
                AddNested(newStage);

                firstColumnIndex += newStage.Columns.Count;
            }
        }

        public override void Add(DrawableHitObject h) => getStageByColumn(((ManiaHitObject)h.HitObject).Column).Add(h);

        public void Add(BarLine barline) => stages.ForEach(s => s.Add(barline));

        private ManiaStage getStageByColumn(int column)
        {
            int sum = 0;
            foreach (var stage in stages)
            {
                sum = sum + stage.Columns.Count;
                if (sum > column)
                    return stage;
            }

            return null;
        }
    }
}