Add "No Scope" mod implementation for Catch

osu.Game/Rulesets/Mods/ModNoScope.cs

@@ -0,0 +1,75 @@
+// 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 osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Localisation;
+using osu.Game.Configuration;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Overlays.Settings;
+using osu.Game.Rulesets.Scoring;
+using osu.Game.Scoring;
+using osu.Game.Screens.Play;
+
+namespace osu.Game.Rulesets.Mods
+{
+    public abstract class ModNoScope : Mod, IApplicableToScoreProcessor, IApplicableToPlayer
+    {
+        public override string Name => "No Scope";
+        public override string Acronym => "NS";
+        public override ModType Type => ModType.Fun;
+        public override IconUsage? Icon => FontAwesome.Solid.EyeSlash;
+        public override double ScoreMultiplier => 1;
+
+        /// <summary>
+        /// Slightly higher than the cutoff for <see cref="Drawable.IsPresent"/>.
+        /// </summary>
+        protected const float MIN_ALPHA = 0.0002f;
+
+        protected const float TRANSITION_DURATION = 100;
+
+        protected BindableNumber<int> CurrentCombo;
+
+        protected IBindable<bool> IsBreakTime;
+
+        protected float ComboBasedAlpha;
+
+        [SettingSource(
+            "Hidden at combo",
+            "The combo count at which the cursor becomes completely hidden",
+            SettingControlType = typeof(SettingsSlider<int, HiddenComboSlider>)
+        )]
+        public BindableInt HiddenComboCount { get; } = new BindableInt
+        {
+            Default = 10,
+            Value = 10,
+            MinValue = 0,
+            MaxValue = 50,
+        };
+
+        public ScoreRank AdjustRank(ScoreRank rank, double accuracy) => rank;
+
+        public void ApplyToPlayer(Player player)
+        {
+            IsBreakTime = player.IsBreakTime.GetBoundCopy();
+        }
+
+        public void ApplyToScoreProcessor(ScoreProcessor scoreProcessor)
+        {
+            if (HiddenComboCount.Value == 0) return;
+
+            CurrentCombo = scoreProcessor.Combo.GetBoundCopy();
+            CurrentCombo.BindValueChanged(combo =>
+            {
+                ComboBasedAlpha = Math.Max(MIN_ALPHA, 1 - (float)combo.NewValue / HiddenComboCount.Value);
+            }, true);
+        }
+    }
+
+    public class HiddenComboSlider : OsuSliderBar<int>
+    {
+        public override LocalisableString TooltipText => Current.Value == 0 ? "always hidden" : base.TooltipText;
+    }
+}