osu/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.Generic;
using System.Linq;
using System.Reflection;
using JetBrains.Annotations;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
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
{
public string Label { get; }
public string Description { get; }
public int? OrderPosition { get; }
public SettingSourceAttribute(string label, string description = null)
{
Label = label ?? string.Empty;
Description = description ?? string.Empty;
}
public SettingSourceAttribute(string label, string description, int orderPosition)
: this(label, description)
{
OrderPosition = 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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switch (value)
{
case BindableNumber<float> bNumber:
yield return new SettingsSlider<float>
{
LabelText = attr.Label,
Bindable = bNumber,
KeyboardStep = 0.1f,
};
break;
case BindableNumber<double> bNumber:
yield return new SettingsSlider<double>
{
LabelText = attr.Label,
Bindable = bNumber,
KeyboardStep = 0.1f,
};
break;
case BindableNumber<int> bNumber:
yield return new SettingsSlider<int>
{
LabelText = attr.Label,
Bindable = bNumber
};
break;
case Bindable<bool> bBool:
yield return new SettingsCheckbox
{
LabelText = attr.Label,
Bindable = bBool
};
break;
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case Bindable<string> bString:
yield return new SettingsTextBox
{
LabelText = attr.Label,
Bindable = bString
};
break;
case IBindable bindable:
var dropdownType = typeof(SettingsEnumDropdown<>).MakeGenericType(bindable.GetType().GetGenericArguments()[0]);
var dropdown = (Drawable)Activator.CreateInstance(dropdownType);
dropdownType.GetProperty(nameof(SettingsDropdown<object>.LabelText))?.SetValue(dropdown, attr.Label);
dropdownType.GetProperty(nameof(SettingsDropdown<object>.Bindable))?.SetValue(dropdown, bindable);
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yield return dropdown;
break;
default:
throw new InvalidOperationException($"{nameof(SettingSourceAttribute)} was attached to an unsupported type ({value})");
}
}
}
public static IEnumerable<(SettingSourceAttribute, PropertyInfo)> GetSettingsSourceProperties(this object obj)
{
foreach (var property in obj.GetType().GetProperties(BindingFlags.GetProperty | BindingFlags.Public | BindingFlags.Instance))
{
var attr = property.GetCustomAttribute<SettingSourceAttribute>(true);
if (attr == null)
continue;
yield return (attr, property);
}
}
public static IEnumerable<(SettingSourceAttribute, PropertyInfo)> GetOrderedSettingsSourceProperties(this object obj)
{
var original = obj.GetSettingsSourceProperties();
var orderedRelative = original.Where(attr => attr.Item1.OrderPosition != null).OrderBy(attr => attr.Item1.OrderPosition);
var unordered = original.Except(orderedRelative);
return orderedRelative.Concat(unordered);
}
}
}