CallbackManager.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;

public class CallbackManager {
  
  public class CallbackCategory {
    public string name = "";
    public List<CallbackInfo> infos;

    public CallbackCategory(string catName) {
      name = catName;
      infos = new List<CallbackInfo>();
    }

    public CallbackInfo getInfoByGameObject(GameObject obj) {
      for (int i = 0; i < infos.Count; i++)
      {
        if (infos[i].obj == obj) return infos[i];
      }
      return null;
    }

    public bool hasObject(GameObject obj) {
      for (int i = 0; i < infos.Count; i++)
      {
        if (infos[i].obj == obj) return true;
      }
      return false;
    }

    public bool hasInfo(CallbackInfo info) { return infos.Contains(info); }
    public CallbackInfo getInfo(GameObject obj) {
      for (int i = 0; i < infos.Count; i++)
      {
        if (infos[i].obj == obj) return infos[i];
      }
      return null;
    }
    public void throwCallbacks() {
      for (int i = 0; i < infos.Count; i++)
      {
        //Debug.Log(infos[i].obj);
        if(infos[i].obj != null) infos[i].callback();
      }
    }
  }

  public class CallbackInfo {
    public GameObject obj;
    public Action callback;
    public CallbackInfo(GameObject obj, Action cb)
    {
      this.obj = obj;
      this.callback = cb;
    }
  }

  static public List<CallbackCategory> data;
  static public CallbackCategory getCategory(string name) {
    if(data == null) data = new List<CallbackCategory>();
    
    for (int i = 0; i < data.Count; i++)
    {
      if (data[i].name == name) return data[i];
    }
    
    data.Add(new CallbackCategory(name));

    return getCategory(name);
  }

  static public void subscribe(string key, CallbackInfo info) {
    CallbackCategory cat = getCategory(key);
    if (!cat.infos.Contains(info)) cat.infos.Add(info);

    //clear empty references
    List<CallbackInfo> tmp = new List<CallbackInfo>();
    for (int i = 0; i < cat.infos.Count; i++)
    {
      if (cat.infos[i].obj != null) tmp.Add(cat.infos[i]);
    }
    cat.infos = tmp;
  }

  static public void unsubscribe(string key, GameObject obj) {
    CallbackCategory cat = getCategory(key);
    CallbackInfo info = cat.getInfoByGameObject(obj);
    if (info != null) unsubscribe(key, info);
  }
  static public void unsubscribe(string key, CallbackInfo info) {
    CallbackCategory cat = getCategory(key);
    if (cat.infos.Contains(info)) cat.infos.Remove(info);
  }
  static public void throwCallbacks(string key) {
    CallbackCategory cat = getCategory(key);
    cat.throwCallbacks();
  }

}