Basic smoke path implementation

osu.Game.Rulesets.Osu/UI/SmokeContainer.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 osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Input;
+using osu.Framework.Input.Bindings;
+using osu.Framework.Input.Events;
+using osu.Game.Rulesets.Osu.Skinning.Default;
+using osu.Game.Skinning;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.UI
+{
+    [Cached]
+    public class SmokeContainer : Container, IRequireHighFrequencyMousePosition, IKeyBindingHandler<OsuAction>
+    {
+        public event Action<Vector2, double>? SmokeMoved;
+        public event Action<double>? SmokeEnded;
+
+        private bool isSmoking = false;
+
+        public override bool ReceivePositionalInputAt(Vector2 _) => true;
+
+        public bool OnPressed(KeyBindingPressEvent<OsuAction> e)
+        {
+            if (e.Action == OsuAction.Smoke)
+            {
+                isSmoking = true;
+                AddInternal(new SkinnableDrawable(new OsuSkinComponent(OsuSkinComponents.Smoke), _ => new DefaultSmoke()));
+
+                return true;
+            }
+
+            return false;
+        }
+
+        public void OnReleased(KeyBindingReleaseEvent<OsuAction> e)
+        {
+            if (e.Action == OsuAction.Smoke)
+            {
+                isSmoking = false;
+                SmokeEnded?.Invoke(Time.Current);
+            }
+        }
+
+        protected override bool OnMouseMove(MouseMoveEvent e)
+        {
+            if (isSmoking)
+                SmokeMoved?.Invoke(e.MousePosition, Time.Current);
+
+            return base.OnMouseMove(e);
+        }
+    }
+}