Add OsuModSettingsTextBox and OsuModSettingsNumberBox

osu.Game/Graphics/UserInterface/OsuModSettingsNumberBox.cs

@@ -0,0 +1,10 @@
+// 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.
+
+namespace osu.Game.Graphics.UserInterface
+{
+    public class OsuModSettingsNumberBox : OsuModSettingsTextBox
+    {
+        protected override bool CanAddCharacter(char character) => char.IsNumber(character);
+    }
+}

osu.Game/Graphics/UserInterface/OsuModSettingsTextBox.cs

@@ -0,0 +1,44 @@
+// 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.Allocation;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics.Colour;
+using osu.Framework.Input.Events;
+
+namespace osu.Game.Graphics.UserInterface
+{
+    public class OsuModSettingsTextBox : OsuTextBox
+    {
+        private const float border_thickness = 3;
+
+        private SRGBColour borderColourFocused;
+        private SRGBColour borderColourUnfocused;
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colour)
+        {
+            borderColourUnfocused = colour.Gray4.Opacity(0.5f);
+            borderColourFocused = BorderColour;
+
+            BorderThickness = border_thickness;
+            BorderColour = borderColourUnfocused;
+        }
+
+        protected override void OnFocus(FocusEvent e)
+        {
+            base.OnFocus(e);
+
+            BorderThickness = border_thickness;
+            BorderColour = borderColourFocused;
+        }
+
+        protected override void OnFocusLost(FocusLostEvent e)
+        {
+            base.OnFocusLost(e);
+
+            BorderThickness = border_thickness;
+            BorderColour = borderColourUnfocused;
+        }
+    }
+}

osu.Game/Overlays/Settings/SettingsTextBox.cs

@@ -8,7 +8,7 @@ namespace osu.Game.Overlays.Settings
 {
     public class SettingsTextBox : SettingsItem<string>
     {
-        protected override Drawable CreateControl() => new OsuTextBox
+        protected override Drawable CreateControl() => new OsuModSettingsTextBox
         {
             Margin = new MarginPadding { Top = 5 },
             RelativeSizeAxes = Axes.X,

osu.Game/Rulesets/Mods/ModRandom.cs

@@ -50,7 +50,7 @@ namespace osu.Game.Rulesets.Mods
                     }
                 }
 
-                private readonly OsuNumberBox seedNumberBox;
+                private readonly OsuModSettingsNumberBox seedNumberBox;
 
                 public SeedControl()
                 {
@@ -76,7 +76,7 @@ namespace osu.Game.Rulesets.Mods
                             {
                                 new Drawable[]
                                 {
-                                    seedNumberBox = new OsuNumberBox
+                                    seedNumberBox = new OsuModSettingsNumberBox
                                     {
                                         RelativeSizeAxes = Axes.X,
                                         CommitOnFocusLost = true