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178 lines
6.1 KiB
C#
178 lines
6.1 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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#nullable disable
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using System.Linq;
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using osu.Framework.Bindables;
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using osu.Game.Graphics;
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using osu.Game.Screens.Edit.Compose.Components;
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using osuTK;
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using osuTK.Graphics;
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namespace osu.Game.Screens.Edit
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{
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public class BindableBeatDivisor : BindableInt
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{
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public static readonly int[] PREDEFINED_DIVISORS = { 1, 2, 3, 4, 6, 8, 12, 16 };
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public Bindable<BeatDivisorPresetCollection> ValidDivisors { get; } = new Bindable<BeatDivisorPresetCollection>(BeatDivisorPresetCollection.COMMON);
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public BindableBeatDivisor(int value = 1)
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: base(value)
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{
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ValidDivisors.BindValueChanged(_ => updateBindableProperties(), true);
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BindValueChanged(_ => ensureValidDivisor());
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}
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/// <summary>
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/// Set a divisor, updating the valid divisor range appropriately.
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/// </summary>
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/// <param name="divisor">The intended divisor.</param>
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/// <param name="preferKnownPresets">Forces changing the valid divisors to a known preset.</param>
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public void SetArbitraryDivisor(int divisor, bool preferKnownPresets = false)
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{
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// If the current valid divisor range doesn't contain the proposed value, attempt to find one which does.
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if (preferKnownPresets || !ValidDivisors.Value.Presets.Contains(divisor))
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{
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if (BeatDivisorPresetCollection.COMMON.Presets.Contains(divisor))
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ValidDivisors.Value = BeatDivisorPresetCollection.COMMON;
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else if (BeatDivisorPresetCollection.TRIPLETS.Presets.Contains(divisor))
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ValidDivisors.Value = BeatDivisorPresetCollection.TRIPLETS;
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else
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ValidDivisors.Value = BeatDivisorPresetCollection.Custom(divisor);
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}
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Value = divisor;
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}
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private void updateBindableProperties()
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{
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ensureValidDivisor();
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MinValue = ValidDivisors.Value.Presets.Min();
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MaxValue = ValidDivisors.Value.Presets.Max();
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}
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private void ensureValidDivisor()
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{
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if (!ValidDivisors.Value.Presets.Contains(Value))
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Value = 1;
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}
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public void SelectNext()
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{
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var presets = ValidDivisors.Value.Presets;
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if (presets.Cast<int?>().SkipWhile(preset => preset != Value).ElementAtOrDefault(1) is int newValue)
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Value = newValue;
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}
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public void SelectPrevious()
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{
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var presets = ValidDivisors.Value.Presets;
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if (presets.Cast<int?>().TakeWhile(preset => preset != Value).LastOrDefault() is int newValue)
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Value = newValue;
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}
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protected override int DefaultPrecision => 1;
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public override void BindTo(Bindable<int> them)
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{
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// bind to valid divisors first (if applicable) to ensure correct transfer of the actual divisor.
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if (them is BindableBeatDivisor otherBeatDivisor)
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ValidDivisors.BindTo(otherBeatDivisor.ValidDivisors);
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base.BindTo(them);
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}
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protected override Bindable<int> CreateInstance() => new BindableBeatDivisor();
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/// <summary>
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/// Retrieves the appropriate colour for a beat divisor.
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/// </summary>
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/// <param name="beatDivisor">The beat divisor.</param>
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/// <param name="colours">The set of colours.</param>
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/// <returns>The applicable colour from <paramref name="colours"/> for <paramref name="beatDivisor"/>.</returns>
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public static Color4 GetColourFor(int beatDivisor, OsuColour colours)
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{
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switch (beatDivisor)
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{
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case 1:
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return Color4.White;
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case 2:
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return colours.Red;
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case 4:
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return colours.Blue;
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case 8:
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return colours.Yellow;
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case 16:
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return colours.PurpleDark;
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case 3:
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return colours.Purple;
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case 6:
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return colours.YellowDark;
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case 12:
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return colours.YellowDarker;
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default:
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return Color4.Red;
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}
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}
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/// <summary>
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/// Get a relative display size for the specified divisor.
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/// </summary>
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/// <param name="beatDivisor">The beat divisor.</param>
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/// <returns>A relative size which can be used to display ticks.</returns>
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public static Vector2 GetSize(int beatDivisor)
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{
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switch (beatDivisor)
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{
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case 1:
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case 2:
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return new Vector2(0.6f, 0.9f);
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case 3:
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case 4:
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return new Vector2(0.5f, 0.8f);
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case 6:
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case 8:
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return new Vector2(0.4f, 0.7f);
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default:
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return new Vector2(0.3f, 0.6f);
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}
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}
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/// <summary>
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/// Retrieves the applicable divisor for a specific beat index.
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/// </summary>
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/// <param name="index">The 0-based beat index.</param>
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/// <param name="beatDivisor">The beat divisor.</param>
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/// <param name="validDivisors">The list of valid divisors which can be chosen from. Assumes ordered from low to high. Defaults to <see cref="PREDEFINED_DIVISORS"/> if omitted.</param>
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/// <returns>The applicable divisor.</returns>
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public static int GetDivisorForBeatIndex(int index, int beatDivisor, int[] validDivisors = null)
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{
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validDivisors ??= PREDEFINED_DIVISORS;
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int beat = index % beatDivisor;
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foreach (int divisor in validDivisors)
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{
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if ((beat * divisor) % beatDivisor == 0)
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return divisor;
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}
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return 0;
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}
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}
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}
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