Extract seed setting control to IHasSeed

osu.Game/Rulesets/Mods/IHasSeed.cs

@@ -0,0 +1,94 @@
+// 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 osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.UserInterface;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Overlays.Settings;
+
+namespace osu.Game.Rulesets.Mods
+{
+    public interface IHasSeed
+    {
+        public Bindable<int?> Seed { get; }
+    }
+
+    public class SeedSettingsControl : SettingsItem<int?>
+    {
+        protected override Drawable CreateControl() => new SeedControl
+        {
+            RelativeSizeAxes = Axes.X,
+            Margin = new MarginPadding { Top = 5 }
+        };
+
+        private sealed class SeedControl : CompositeDrawable, IHasCurrentValue<int?>
+        {
+            private readonly BindableWithCurrent<int?> current = new BindableWithCurrent<int?>();
+
+            public Bindable<int?> Current
+            {
+                get => current;
+                set
+                {
+                    current.Current = value;
+                    seedNumberBox.Text = value.Value.ToString();
+                }
+            }
+
+            private readonly OsuNumberBox seedNumberBox;
+
+            public SeedControl()
+            {
+                AutoSizeAxes = Axes.Y;
+
+                InternalChildren = new[]
+                {
+                    new GridContainer
+                    {
+                        RelativeSizeAxes = Axes.X,
+                        AutoSizeAxes = Axes.Y,
+                        ColumnDimensions = new[]
+                        {
+                            new Dimension(),
+                            new Dimension(GridSizeMode.Absolute, 2),
+                            new Dimension(GridSizeMode.Relative, 0.25f)
+                        },
+                        RowDimensions = new[]
+                        {
+                            new Dimension(GridSizeMode.AutoSize)
+                        },
+                        Content = new[]
+                        {
+                            new Drawable[]
+                            {
+                                seedNumberBox = new OsuNumberBox
+                                {
+                                    RelativeSizeAxes = Axes.X,
+                                    CommitOnFocusLost = true
+                                }
+                            }
+                        }
+                    }
+                };
+
+                seedNumberBox.Current.BindValueChanged(e =>
+                {
+                    int? value = null;
+
+                    if (int.TryParse(e.NewValue, out var intVal))
+                        value = intVal;
+
+                    current.Value = value;
+                });
+            }
+
+            protected override void Update()
+            {
+                if (current.Value == null)
+                    seedNumberBox.Text = current.Current.Value.ToString();
+            }
+        }
+    }
+}