From ed6d1ccd958622bbca51c8cab54f0c3dfd4a6296 Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Fri, 6 Dec 2019 17:09:24 +0900
Subject: [PATCH] Add a method for getting settings UI components automatically
 from a target class

---
 .../Configuration/SettingSourceAttribute.cs   | 85 +++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 osu.Game/Configuration/SettingSourceAttribute.cs

diff --git a/osu.Game/Configuration/SettingSourceAttribute.cs b/osu.Game/Configuration/SettingSourceAttribute.cs
new file mode 100644
index 0000000000..fe582b1461
--- /dev/null
+++ b/osu.Game/Configuration/SettingSourceAttribute.cs
@@ -0,0 +1,85 @@
+// 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>
+    [MeansImplicitUse]
+    [AttributeUsage(AttributeTargets.Property)]
+    public class SettingSourceAttribute : Attribute
+    {
+        public string Label { get; }
+
+        public string Description { get; }
+
+        public SettingSourceAttribute(string label, string description = null)
+        {
+            Label = label ?? string.Empty;
+            Description = description ?? string.Empty;
+        }
+    }
+
+    public static class SettingSourceExtensions
+    {
+        public static IEnumerable<Drawable> CreateSettingsControls(this object obj)
+        {
+            var configProperties = obj.GetType().GetProperties(BindingFlags.GetProperty | BindingFlags.Public | BindingFlags.Instance).Where(p => p.GetCustomAttribute<SettingSourceAttribute>(true) != null);
+
+            foreach (var property in configProperties)
+            {
+                var attr = property.GetCustomAttribute<SettingSourceAttribute>(true);
+
+                switch (property.GetValue(obj))
+                {
+                    case BindableNumber<float> bNumber:
+                        yield return new SettingsSlider<float>
+                        {
+                            LabelText = attr.Label,
+                            Bindable = bNumber
+                        };
+
+                        break;
+
+                    case BindableNumber<double> bNumber:
+                        yield return new SettingsSlider<double>
+                        {
+                            LabelText = attr.Label,
+                            Bindable = bNumber
+                        };
+
+                        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;
+                }
+            }
+        }
+    }
+}