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osu-lazer/osu.Game/Configuration/SettingSourceAttribute.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 System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using JetBrains.Annotations;
using osu.Framework.Bindables;
using osu.Framework.Extensions.ObjectExtensions;
using osu.Framework.Extensions.TypeExtensions;
using osu.Framework.Graphics;
using osu.Framework.Localisation;
using osu.Game.Graphics.UserInterface;
using osu.Game.Overlays.Settings;
namespace osu.Game.Configuration
{
/// <summary>
/// An attribute to mark a bindable as being exposed to the user via settings controls.
/// Can be used in conjunction with <see cref="SettingSourceExtensions.CreateSettingsControls"/> to automatically create UI controls.
/// </summary>
/// <remarks>
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/// All controls with <see cref="OrderPosition"/> set will be placed first in ascending order.
/// All controls with no <see cref="OrderPosition"/> will come afterward in default order.
/// </remarks>
[MeansImplicitUse]
[AttributeUsage(AttributeTargets.Property)]
public class SettingSourceAttribute : Attribute, IComparable<SettingSourceAttribute>
{
public LocalisableString Label { get; }
public LocalisableString Description { get; }
public int? OrderPosition { get; }
/// <summary>
/// The type of the settings control which handles this setting source.
/// </summary>
/// <remarks>
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/// Must be a type deriving <see cref="SettingsItem{T}"/> with a public parameterless constructor.
/// </remarks>
public Type? SettingControlType { get; set; }
public SettingSourceAttribute(Type declaringType, string label, string? description = null)
{
Label = getLocalisableStringFromMember(label) ?? string.Empty;
Description = getLocalisableStringFromMember(description) ?? string.Empty;
LocalisableString? getLocalisableStringFromMember(string? member)
{
if (member == null)
return null;
var property = declaringType.GetMember(member, BindingFlags.Static | BindingFlags.Public).FirstOrDefault();
if (property == null)
return null;
switch (property)
{
case FieldInfo f:
return (LocalisableString)f.GetValue(null).AsNonNull();
case PropertyInfo p:
return (LocalisableString)p.GetValue(null).AsNonNull();
default:
throw new InvalidOperationException($"Member \"{member}\" was not found in type {declaringType} (must be a static field or property)");
}
}
}
public SettingSourceAttribute(string? label, string? description = null)
{
Label = label ?? string.Empty;
Description = description ?? string.Empty;
}
public SettingSourceAttribute(Type declaringType, string label, string description, int orderPosition)
: this(declaringType, label, description)
{
OrderPosition = orderPosition;
}
public SettingSourceAttribute(string label, string description, int orderPosition)
: this(label, description)
{
OrderPosition = orderPosition;
}
public int CompareTo(SettingSourceAttribute other)
{
if (OrderPosition == other.OrderPosition)
return 0;
// unordered items come last (are greater than any ordered items).
if (OrderPosition == null)
return 1;
if (other.OrderPosition == null)
return -1;
// ordered items are sorted by the order value.
return OrderPosition.Value.CompareTo(other.OrderPosition);
}
}
public static class SettingSourceExtensions
{
public static IEnumerable<Drawable> CreateSettingsControls(this object obj)
{
foreach (var (attr, property) in obj.GetOrderedSettingsSourceProperties())
{
object value = property.GetValue(obj);
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if (attr.SettingControlType != null)
{
var controlType = attr.SettingControlType;
if (controlType.EnumerateBaseTypes().All(t => !t.IsGenericType || t.GetGenericTypeDefinition() != typeof(SettingsItem<>)))
throw new InvalidOperationException($"{nameof(SettingSourceAttribute)} had an unsupported custom control type ({controlType.ReadableName()})");
var control = (Drawable)Activator.CreateInstance(controlType);
controlType.GetProperty(nameof(SettingsItem<object>.SettingSourceObject))?.SetValue(control, obj);
controlType.GetProperty(nameof(SettingsItem<object>.LabelText))?.SetValue(control, attr.Label);
controlType.GetProperty(nameof(SettingsItem<object>.TooltipText))?.SetValue(control, attr.Description);
controlType.GetProperty(nameof(SettingsItem<object>.Current))?.SetValue(control, value);
yield return control;
continue;
}
switch (value)
{
case BindableNumber<float> bNumber:
yield return new SettingsSlider<float>
{
LabelText = attr.Label,
TooltipText = attr.Description,
Current = bNumber,
KeyboardStep = 0.1f,
};
break;
case BindableNumber<double> bNumber:
yield return new SettingsSlider<double>
{
LabelText = attr.Label,
TooltipText = attr.Description,
Current = bNumber,
KeyboardStep = 0.1f,
};
break;
case BindableNumber<int> bNumber:
yield return new SettingsSlider<int>
{
LabelText = attr.Label,
TooltipText = attr.Description,
Current = bNumber
};
break;
case Bindable<bool> bBool:
yield return new SettingsCheckbox
{
LabelText = attr.Label,
TooltipText = attr.Description,
Current = bBool
};
break;
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case Bindable<string> bString:
yield return new SettingsTextBox
{
LabelText = attr.Label,
TooltipText = attr.Description,
Current = bString
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};
break;
case IBindable bindable:
var dropdownType = typeof(ModSettingsEnumDropdown<>).MakeGenericType(bindable.GetType().GetGenericArguments()[0]);
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var dropdown = (Drawable)Activator.CreateInstance(dropdownType);
dropdownType.GetProperty(nameof(SettingsDropdown<object>.LabelText))?.SetValue(dropdown, attr.Label);
dropdownType.GetProperty(nameof(SettingsDropdown<object>.TooltipText))?.SetValue(dropdown, attr.Description);
dropdownType.GetProperty(nameof(SettingsDropdown<object>.Current))?.SetValue(dropdown, bindable);
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yield return dropdown;
break;
default:
throw new InvalidOperationException($"{nameof(SettingSourceAttribute)} was attached to an unsupported type ({value})");
}
}
}
private static readonly ConcurrentDictionary<Type, (SettingSourceAttribute, PropertyInfo)[]> property_info_cache = new ConcurrentDictionary<Type, (SettingSourceAttribute, PropertyInfo)[]>();
/// <summary>
/// Returns the underlying value of the given mod setting object.
/// Can be used for serialization and equality comparison purposes.
/// </summary>
/// <param name="setting">A <see cref="SettingSourceAttribute"/> bindable.</param>
public static object GetUnderlyingSettingValue(this object setting)
{
switch (setting)
{
case Bindable<double> d:
return d.Value;
case Bindable<int> i:
return i.Value;
case Bindable<float> f:
return f.Value;
case Bindable<bool> b:
return b.Value;
case IBindable u:
// An unknown (e.g. enum) generic type.
var valueMethod = u.GetType().GetProperty(nameof(IBindable<int>.Value));
Debug.Assert(valueMethod != null);
return valueMethod.GetValue(u);
default:
// fall back for non-bindable cases.
return setting;
}
}
public static IEnumerable<(SettingSourceAttribute, PropertyInfo)> GetSettingsSourceProperties(this object obj)
{
var type = obj.GetType();
if (!property_info_cache.TryGetValue(type, out var properties))
property_info_cache[type] = properties = getSettingsSourceProperties(type).ToArray();
return properties;
}
private static IEnumerable<(SettingSourceAttribute, PropertyInfo)> getSettingsSourceProperties(Type type)
{
foreach (var property in type.GetProperties(BindingFlags.GetProperty | BindingFlags.Public | BindingFlags.Instance))
{
var attr = property.GetCustomAttribute<SettingSourceAttribute>(true);
if (attr == null)
continue;
yield return (attr, property);
}
}
public static ICollection<(SettingSourceAttribute, PropertyInfo)> GetOrderedSettingsSourceProperties(this object obj)
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=> obj.GetSettingsSourceProperties()
.OrderBy(attr => attr.Item1)
.ToArray();
private class ModSettingsEnumDropdown<T> : SettingsEnumDropdown<T>
where T : struct, Enum
{
protected override OsuDropdown<T> CreateDropdown() => new ModDropdownControl();
private class ModDropdownControl : DropdownControl
{
// Set menu's max height low enough to workaround nested scroll issues (see https://github.com/ppy/osu-framework/issues/4536).
protected override DropdownMenu CreateMenu() => base.CreateMenu().With(m => m.MaxHeight = 100);
}
}
}
}