Open-sourced some code

Scripts/Game Objects/DamagerController.cs

@@ -0,0 +1,49 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class DamagerController : MonoBehaviour {
+	public delegate void CallbackHandler(Collider2D collider);
+
+	List<CallbackHandler> onTriggerEnter = new List<CallbackHandler>();
+	List<CallbackHandler> onTriggerStay= new List<CallbackHandler>();
+	List<CallbackHandler> onTriggerExit = new List<CallbackHandler>();
+
+	//public access members
+	public void PushOnTriggerEnter(CallbackHandler callback) {
+		onTriggerEnter.Add(callback);
+	}
+
+	public void PushOnTriggerStay(CallbackHandler callback) {
+		onTriggerStay.Add(callback);
+	}
+
+	public void PushOnTriggerExit(CallbackHandler callback) {
+		onTriggerExit.Add(callback);
+	}
+
+	public void PurgeLists() {
+		onTriggerEnter.Clear();
+		onTriggerStay.Clear();
+		onTriggerExit.Clear();
+	}
+
+	//monobehaviour members
+	void OnTriggerEnter2D(Collider2D collider) {
+		foreach(CallbackHandler callback in onTriggerEnter) {
+			callback(collider);
+		}
+	}
+
+	void OnTriggerStay2D(Collider2D collider) {
+		foreach(CallbackHandler callback in onTriggerStay) {
+			callback(collider);
+		}
+	}
+
+	void OnTriggerExit2D(Collider2D collider) {
+		foreach(CallbackHandler callback in onTriggerExit) {
+			callback(collider);
+		}
+	}
+}