using System;
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using System.Collections.Generic;
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using UnityEngine;
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/// <summary>
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/// 事件广播系统
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/// </summary>
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public class EventBroadcast
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{
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private static EventBroadcast _instance;
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public static EventBroadcast Instance
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{
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get
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{
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if (_instance == null)
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{
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_instance = new EventBroadcast();
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}
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return _instance;
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}
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}
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// 事件字典，存储事件ID和对应的委托列表
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private Dictionary<string, Delegate> eventDict = new Dictionary<string, Delegate>();
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// 防止外部实例化
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private EventBroadcast() { }
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#region 添加监听
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/// <summary>
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/// 添加无参事件监听
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/// </summary>
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/// <param name="eventId">事件ID</param>
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/// <param name="callback">回调函数</param>
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public void AddListener(string eventId, Action callback)
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{
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OnListenerAdding(eventId, callback);
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eventDict[eventId] = (Action)eventDict[eventId] + callback;
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}
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/// <summary>
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/// 添加单参数事件监听
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/// </summary>
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public void AddListener<T>(string eventId, Action<T> callback)
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{
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OnListenerAdding(eventId, callback);
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eventDict[eventId] = (Action<T>)eventDict[eventId] + callback;
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}
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/// <summary>
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/// 添加双参数事件监听
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/// </summary>
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public void AddListener<T, U>(string eventId, Action<T, U> callback)
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{
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OnListenerAdding(eventId, callback);
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eventDict[eventId] = (Action<T, U>)eventDict[eventId] + callback;
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}
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/// <summary>
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/// 添加三参数事件监听
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/// </summary>
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public void AddListener<T, U, V>(string eventId, Action<T, U, V> callback)
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{
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OnListenerAdding(eventId, callback);
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eventDict[eventId] = (Action<T, U, V>)eventDict[eventId] + callback;
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}
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#endregion
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#region 移除监听
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/// <summary>
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/// 移除无参事件监听
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/// </summary>
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/// <param name="eventId">事件ID</param>
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/// <param name="callback">回调函数</param>
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public void RemoveListener(string eventId, Action callback)
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{
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if (OnListenerRemoving(eventId, callback))
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{
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eventDict[eventId] = (Action)eventDict[eventId] - callback;
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OnListenerRemoved(eventId);
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}
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}
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/// <summary>
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/// 移除单参数事件监听
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/// </summary>
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public void RemoveListener<T>(string eventId, Action<T> callback)
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{
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if (OnListenerRemoving(eventId, callback))
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{
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eventDict[eventId] = (Action<T>)eventDict[eventId] - callback;
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OnListenerRemoved(eventId);
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}
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}
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/// <summary>
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/// 移除双参数事件监听
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/// </summary>
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public void RemoveListener<T, U>(string eventId, Action<T, U> callback)
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{
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if (OnListenerRemoving(eventId, callback))
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{
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eventDict[eventId] = (Action<T, U>)eventDict[eventId] - callback;
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OnListenerRemoved(eventId);
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}
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}
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/// <summary>
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/// 移除三参数事件监听
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/// </summary>
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public void RemoveListener<T, U, V>(string eventId, Action<T, U, V> callback)
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{
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if (OnListenerRemoving(eventId, callback))
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{
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eventDict[eventId] = (Action<T, U, V>)eventDict[eventId] - callback;
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OnListenerRemoved(eventId);
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}
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}
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#endregion
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#region 触发事件
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/// <summary>
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/// 触发无参事件
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/// </summary>
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/// <param name="eventId">事件ID</param>
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public void Broadcast(string eventId)
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{
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if (eventDict.TryGetValue(eventId, out Delegate d))
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{
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Action callback = d as Action;
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if (callback != null)
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{
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callback();
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}
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else
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{
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Debug.LogError($"事件 {eventId} 的委托类型不匹配");
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}
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}
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}
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/// <summary>
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/// 触发单参数事件
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/// </summary>
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public void Broadcast<T>(string eventId, T arg)
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{
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if (eventDict.TryGetValue(eventId, out Delegate d))
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{
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Action<T> callback = d as Action<T>;
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if (callback != null)
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{
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callback(arg);
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}
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else
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{
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Debug.LogError($"事件 {eventId} 的委托类型不匹配");
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}
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}
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}
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/// <summary>
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/// 触发双参数事件
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/// </summary>
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public void Broadcast<T, U>(string eventId, T arg1, U arg2)
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{
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if (eventDict.TryGetValue(eventId, out Delegate d))
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{
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Action<T, U> callback = d as Action<T, U>;
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if (callback != null)
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{
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callback(arg1, arg2);
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}
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else
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{
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Debug.LogError($"事件 {eventId} 的委托类型不匹配");
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}
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}
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}
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/// <summary>
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/// 触发三参数事件
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/// </summary>
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public void Broadcast<T, U, V>(string eventId, T arg1, U arg2, V arg3)
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{
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if (eventDict.TryGetValue(eventId, out Delegate d))
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{
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Action<T, U, V> callback = d as Action<T, U, V>;
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if (callback != null)
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{
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callback(arg1, arg2, arg3);
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}
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else
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{
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Debug.LogError($"事件 {eventId} 的委托类型不匹配");
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}
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}
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}
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#endregion
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#region 辅助方法
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/// <summary>
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/// 添加监听前的处理
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/// </summary>
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private void OnListenerAdding(string eventId, Delegate callback)
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{
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if (!eventDict.ContainsKey(eventId))
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{
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eventDict.Add(eventId, null);
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}
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Delegate d = eventDict[eventId];
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if (d != null && d.GetType() != callback.GetType())
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{
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Debug.LogError($"尝试为事件 {eventId} 添加不同类型的委托，当前类型：{d.GetType()}，尝试添加类型：{callback.GetType()}");
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}
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}
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/// <summary>
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/// 移除监听前的处理
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/// </summary>
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private bool OnListenerRemoving(string eventId, Delegate callback)
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{
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if (!eventDict.ContainsKey(eventId))
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{
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Debug.LogWarning($"尝试移除不存在的事件 {eventId}");
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return false;
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}
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Delegate d = eventDict[eventId];
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if (d == null)
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{
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Debug.LogWarning($"尝试移除事件 {eventId} 的空委托");
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return false;
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}
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else if (d.GetType() != callback.GetType())
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{
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Debug.LogError($"尝试为事件 {eventId} 移除不同类型的委托，当前类型：{d.GetType()}，尝试移除类型：{callback.GetType()}");
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return false;
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}
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return true;
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}
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/// <summary>
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/// 移除监听后的处理
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/// </summary>
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private void OnListenerRemoved(string eventId)
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{
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if (eventDict[eventId] == null)
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{
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eventDict.Remove(eventId);
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}
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}
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/// <summary>
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/// 清空所有事件
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/// </summary>
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public void ClearAllEvents()
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{
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eventDict.Clear();
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}
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#endregion
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}
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