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osu-lazer/osu.Game/Rulesets/Mods/DifficultyBindable.cs

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// 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.Bindables;
using osu.Game.Beatmaps;
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namespace osu.Game.Rulesets.Mods
{
public class DifficultyBindable : Bindable<float?>
{
/// <summary>
/// Whether the extended limits should be applied to this bindable.
/// </summary>
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public readonly BindableBool ExtendedLimits = new BindableBool();
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/// <summary>
/// An internal numeric bindable to hold and propagate min/max/precision.
/// The value of this bindable should not be set.
/// </summary>
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internal readonly BindableFloat CurrentNumber = new BindableFloat
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{
MinValue = 0,
MaxValue = 10,
};
/// <summary>
/// A function that can extract the current value of this setting from a beatmap difficulty for display purposes.
/// </summary>
public Func<IBeatmapDifficultyInfo, float>? ReadCurrentFromDifficulty;
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public float Precision
{
set => CurrentNumber.Precision = value;
}
private float minValue;
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public float MinValue
{
set
{
if (value == minValue)
return;
minValue = value;
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updateExtents();
}
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}
private float maxValue = 10; // matches default max value of `CurrentNumber`
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public float MaxValue
{
set
{
if (value == maxValue)
return;
maxValue = value;
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updateExtents();
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}
}
private float? extendedMinValue;
/// <summary>
/// The minimum value to be used when extended limits are applied.
/// </summary>
public float? ExtendedMinValue
{
set
{
if (value == extendedMinValue)
return;
extendedMinValue = value;
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updateExtents();
}
}
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private float? extendedMaxValue;
/// <summary>
/// The maximum value to be used when extended limits are applied.
/// </summary>
public float? ExtendedMaxValue
{
set
{
if (value == extendedMaxValue)
return;
extendedMaxValue = value;
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updateExtents();
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}
}
public DifficultyBindable()
: this(null)
{
}
public DifficultyBindable(float? defaultValue = null)
: base(defaultValue)
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{
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ExtendedLimits.BindValueChanged(_ => updateExtents());
}
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public override float? Value
{
get => base.Value;
set
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{
// Ensure that in the case serialisation runs in the wrong order (and limit extensions aren't applied yet) the deserialised value is still propagated.
if (value != null)
CurrentNumber.MaxValue = MathF.Max(CurrentNumber.MaxValue, value.Value);
base.Value = value;
}
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}
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private void updateExtents()
{
CurrentNumber.MinValue = ExtendedLimits.Value && extendedMinValue != null ? extendedMinValue.Value : minValue;
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CurrentNumber.MaxValue = ExtendedLimits.Value && extendedMaxValue != null ? extendedMaxValue.Value : maxValue;
}
public override void CopyTo(Bindable<float?> them)
{
if (!(them is DifficultyBindable otherDifficultyBindable))
throw new InvalidOperationException($"Cannot copy to a non-{nameof(DifficultyBindable)}.");
base.CopyTo(them);
otherDifficultyBindable.ReadCurrentFromDifficulty = ReadCurrentFromDifficulty;
// the following max value copies are only safe as long as these values are effectively constants.
otherDifficultyBindable.MaxValue = maxValue;
otherDifficultyBindable.ExtendedMaxValue = extendedMaxValue;
}
public override void BindTo(Bindable<float?> them)
{
if (!(them is DifficultyBindable otherDifficultyBindable))
throw new InvalidOperationException($"Cannot bind to a non-{nameof(DifficultyBindable)}.");
// ensure that MaxValue and ExtendedMaxValue are copied across first before continuing.
// not doing so may cause the value of CurrentNumber to be truncated to 10.
otherDifficultyBindable.CopyTo(this);
// set up mutual binding for ExtendedLimits to correctly set the upper bound of CurrentNumber.
ExtendedLimits.BindTarget = otherDifficultyBindable.ExtendedLimits;
// set up mutual binding for CurrentNumber. this must happen after all of the above.
CurrentNumber.BindTarget = otherDifficultyBindable.CurrentNumber;
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// finish up the binding by setting up weak references via the base call.
// unfortunately this will call `.CopyTo()` again, but fixing that is problematic and messy.
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base.BindTo(them);
}
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public override void UnbindFrom(IUnbindable them)
{
if (!(them is DifficultyBindable otherDifficultyBindable))
throw new InvalidOperationException($"Cannot unbind from a non-{nameof(DifficultyBindable)}.");
base.UnbindFrom(them);
CurrentNumber.UnbindFrom(otherDifficultyBindable.CurrentNumber);
ExtendedLimits.UnbindFrom(otherDifficultyBindable.ExtendedLimits);
}
protected override Bindable<float?> CreateInstance() => new DifficultyBindable();
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}
}