Move DrawableHitObject.

osu.Game/Modes/Objects/Drawables/DrawableHitObject.cs

@@ -0,0 +1,86 @@
+//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using osu.Framework;
+using osu.Framework.Graphics.Containers;
+
+namespace osu.Game.Modes.Objects.Drawables
+{
+    public abstract class DrawableHitObject : Container, IStateful<ArmedState>
+    {
+        //todo: move to a more central implementation. this logic should not be at a drawable level.
+        public Action<DrawableHitObject> OnHit;
+        public Action<DrawableHitObject> OnMiss;
+
+        public Func<DrawableHitObject, bool> AllowHit;
+
+        public HitObject HitObject;
+
+        public DrawableHitObject(HitObject hitObject)
+        {
+            HitObject = hitObject;
+            Depth = -(float)hitObject.StartTime;
+        }
+
+        private ArmedState state;
+        public ArmedState State
+        {
+            get { return state; }
+
+            set
+            {
+                if (state == value) return;
+                state = value;
+
+                UpdateState(state);
+            }
+        }
+
+        protected double? HitTime;
+
+        protected virtual bool Hit()
+        {
+            if (State != ArmedState.Disarmed)
+                return false;
+
+            if (AllowHit?.Invoke(this) == false)
+                return false;
+
+            HitTime = Time.Current;
+
+            State = ArmedState.Armed;
+            return true;
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            UpdateState(state);
+        }
+
+        private bool counted;
+
+        protected override void Update()
+        {
+            base.Update();
+
+            if (Time.Current >= HitObject.EndTime && !counted)
+            {
+                counted = true;
+                if (state == ArmedState.Armed)
+                    OnHit?.Invoke(this);
+                else
+                    OnMiss?.Invoke(this);
+            }
+        }
+
+        protected abstract void UpdateState(ArmedState state);
+    }
+
+    public enum ArmedState
+    {
+        Disarmed,
+        Armed
+    }
+}