原文地址：http://bbs.9ria.com/thread-153258-1-1.html
原project地址：https://github.com/djandrew/UnityEventManager
多年的Flash开发。我很赞赏Flash的事件系统。
Uinty对象通信所使用的方法SendMessage在多数情况下是工作正常，但假设在一个具有无数引用其它对象的GameObject的大型项目进行反射，那问题就来了。
我用C＃在Uinty中所写的第一个东西，就是管理抽象类的事件管理系统。
究其核心。EventManager使用也是SendMessage。并对游戏对象[gameObject]有直接引用，但若有事件发生。其便会对需求进行分解，不同的类间会有信息共享，这样事件对象就知道怎样互相通信。
若有不论什么建议或修正。欢迎留言。
EventManager.cs(十按。本链接为凝视译版，若认为某译不妥请对比英文版自行勘误)
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/*
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Event Manager
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Static manager for handling an event driven communication model in Unity.
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This is similar to Adobe Flash's event listener model used in ActionScript.
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Copyright © 2012 Dustin Andrew
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dustin.andrew@gmail.com
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http://www.dustinandrew.me/
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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http://www.gnu.org/licenses/
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*/
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/*
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* Setup:
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* Create an empty GameObject and add the EventManager script to it.
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* Create custom event classes that extend the CustomEvent.
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*
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* Restrictions & Tips:
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* DO NOT add event listeners in the Awake() method!
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* This is used by the EventManager to initialize.
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* Change this class' Execution Order to before default time if you need to work around this.
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* Use the Start() method to setup your events.
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* Make event listener callback functions public.
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* Extend the CustomEvent class when creating your events.
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* Use custom variables in your custom events over the arguments hashtable to maintain class abstraction
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* Clean up and remove event listeners when objects are destroyed.
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* Events are not received if the listener gameObject.active is false.
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*
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* Examples:
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*
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* // setup event listeners
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* void Start() {
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* EventManager.instance.addEventListener(CustomEventObj.EVENT_TO_LISTEN_TO, gameObject, "OnSomethingHappened");
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* }
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*
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* // remove event listeners
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* void OnDestroy() {
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* if (gameObject) {
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* // remove a single event
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* EventManager.instance.removeEventListener(CustomEventObj.EVENT_TO_LISTEN_TO, gameObject);
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* // remove all events
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* EventManager.instance.removeAllEventListeners(gameObject);
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* }
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* }
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*
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* // get values passed by events
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* public void OnSomethingHappened(CustomEventObj evt) {
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* Debug.Log((datatype)evt.arguments["value"]);
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* // or if using custom vars instead of arguments hashtable
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* Debug.Log(evt.rockOn);
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* }
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*
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* // dispatch events
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* void TriggerEvent() {
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* CustomEventObj evt = new CustomEventObj(CustomEventObj.EVENT_TO_TRIGGER);
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* evt.arguments.Add("value", 3);
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* EventManager.instance.dispatchEvent(evt);
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* }
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*
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* // create custom events
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* using UnityEngine;
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* using System.Collections;
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*
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* public class CustomEventObj : CustomEvent {
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*
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* // event types
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* public static string MY_EVENT_1 = "my_event_1";
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* public static string MY_EVENT_2 = "my_event_2";
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*
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* // optionally add custom variables instead of using the arguments hashtable
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* public int myCustomEventVar1 = 0;
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* public bool rockOn = true;
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*
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* public CustomEventObj(string eventType = "") {
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* type = eventType;
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* }
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* }
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*
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*/
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using UnityEngine;
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using System.Collections;
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// internal event listener model
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internal class EventListener {
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public string name;
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public GameObject listener;
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public string function;
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}
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// Custom event class, extend when creating custom events
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public class CustomEvent {
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private string _type;
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private Hashtable _arguments = new Hashtable();
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// constructor
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public CustomEvent(string eventType = "") {
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_type = eventType;
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}
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// the type of event
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public string type {
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get { return _type; }
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set { _type = value; }
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}
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// the arguments to pass with the event
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public Hashtable arguments {
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get { return _arguments; }
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set { _arguments = value; }
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}
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}
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public class EventManager : MonoBehaviour {
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// singleton instance
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public static EventManager instance;
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// settings
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public bool allowSingleton = true; // EventManager class will transfer between scene changes.
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public bool allowWarningOutputs = true;
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public bool allowDebugOutputs = true;
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private static bool _created = false;
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private Hashtable _listeners = new Hashtable();
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// setup singleton if allowed
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public void Awake() {
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if (!_created && allowSingleton) {
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DontDestroyOnLoad(this);
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instance = this;
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_created = true;
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Setup();
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} else {
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if (allowSingleton) {
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if (EventManager.instance.allowWarningOutputs) {
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Debug.LogWarning("Only a single instance of " + this.name + " should exists!");
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}
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Destroy(gameObject);
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} else {
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instance = this;
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Setup();
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}
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}
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}
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// clear events on quit
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public void OnApplicationQuit() {
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_listeners.Clear();
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}
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// PUBLIC *******************************
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// Add event listener
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public bool addEventListener(string eventType, GameObject listener, string function) {
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if (listener == null || eventType == null) {
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if (allowWarningOutputs) {
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Debug.LogWarning("Event Manager: AddListener failed due to no listener or event name specified.");
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}
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return false;
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}
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recordEvent(eventType);
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return recordListener(eventType, listener, function);
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}
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// Remove event listener
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public bool removeEventListener(string eventType, GameObject listener) {
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if (!checkForEvent(eventType)) return false;
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ArrayList listenerList = _listeners[eventType] as ArrayList;
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foreach (EventListener callback in listenerList) {
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if (callback.name == listener.GetInstanceID().ToString()) {
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listenerList.Remove(callback);
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return true;
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}
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}
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return false;
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}
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// Remove all event listeners
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public void removeAllEventListeners(GameObject listener) {
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foreach (EventListener callback in _listeners) {
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if (callback.listener.GetInstanceID().ToString() == listener.GetInstanceID().ToString()) {
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_listeners.Remove(callback);
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}
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}
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}
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// Dispatch an event
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public bool dispatchEvent(CustomEvent evt) {
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string eventType = evt.type;
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if (!checkForEvent(eventType)) {
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if (allowWarningOutputs) {
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Debug.LogWarning("Event Manager: Event "" + eventType + "" triggered has no listeners!");
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}
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return false;
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}
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ArrayList listenerList = _listeners[eventType] as ArrayList;
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if (allowDebugOutputs) {
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Debug.Log("Event Manager: Event " + eventType + " dispatched to " + listenerList.Count + ((listenerList.Count == 1) ? " listener." : " listeners."));
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}
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foreach (EventListener callback in listenerList) {
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if (callback.listener && callback.listener.active) {
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callback.listener.SendMessage(callback.function, evt, SendMessageOptions.DontRequireReceiver);
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}
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}
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return false;
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}
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// PRIVATE *******************************
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private void Setup() {
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// TO DO: Self create GameObject if not already created
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}
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// see if event already exists
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private bool checkForEvent(string eventType) {
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if (_listeners.ContainsKey(eventType)) return true;
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return false;
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}
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// record event, if it doesn't already exists
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private bool recordEvent(string eventType) {
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if (!checkForEvent(eventType)) {
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_listeners.Add(eventType, new ArrayList());
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}
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return true;
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}
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// delete event, if not already removed
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private bool deleteEvent(string eventType) {
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if (!checkForEvent(eventType)) return false;
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_listeners.Remove(eventType);
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return true;
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}
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// check if listener exists
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private bool checkForListener(string eventType, GameObject listener) {
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if (!checkForEvent(eventType)) {
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recordEvent(eventType);
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}
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ArrayList listenerList = _listeners[eventType] as ArrayList;
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foreach (EventListener callback in listenerList) {
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if (callback.name == listener.GetInstanceID().ToString()) return true;
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}
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return false;
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}
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// record listener, if not already recorded
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private bool recordListener(string eventType, GameObject listener, string function) {
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if (!checkForListener(eventType, listener)) {
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ArrayList listenerList = _listeners[eventType] as ArrayList;
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EventListener callback = new EventListener();
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callback.name = listener.GetInstanceID().ToString();
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callback.listener = listener;
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callback.function = function;
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listenerList.Add(callback);
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return true;
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} else {
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if (allowWarningOutputs) {
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Debug.LogWarning("Event Manager: Listener: " + listener.name + " is already in list for event: " + eventType);
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}
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return false;
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}
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}
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原文链接：http://www.dustinandrew.me/blog/2012/10/9/unity3d-c-event-manager.html
翻译词数：225