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using System;
using System.Collections.Generic;
using UnityEngine;
namespace WK
{
public sealed class NotificationCenter : Singleton<NotificationCenter>
{
public delegate void NotificatonHandler(params object[] args);
private Dictionary<string/*eventName*/, Dictionary<object/*publisher*/, List<NotificatonHandler>>> m_EventListeners = new Dictionary<string, Dictionary<object, List<NotificatonHandler>>>();
/// <summary>
/// 当前在调用中的回调
/// </summary>
private HashSet<List<NotificatonHandler>> m_CurInvokingCallbacks = new HashSet<List<NotificatonHandler>>();
public void AddObserver(string notificationName, NotificatonHandler handler)
{
AddObserver(null, notificationName, handler);
}
public void AddObserver(object sender, string notificationName, NotificatonHandler handler)
{
if (handler == null)
{
Debug.LogError("Can't add a null event handler for notification, " + notificationName);
return;
}
if (string.IsNullOrEmpty(notificationName))
{
Debug.LogError("Can't observe an unnamed notification");
return;
}
if (!m_EventListeners.ContainsKey(notificationName))
{
m_EventListeners.Add(notificationName, new Dictionary<object, List<NotificatonHandler>>());
}
Dictionary<object, List<NotificatonHandler>> dictionary = m_EventListeners[notificationName];
object key = ((sender != null) ? sender : this);
if (!dictionary.ContainsKey(key))
{
dictionary.Add(key, new List<NotificatonHandler>());
}
List<NotificatonHandler> list = dictionary[key];
if (m_CurInvokingCallbacks.Contains(list))
{
list = (dictionary[key] = new List<NotificatonHandler>(list));
}
list.Add(handler);
}
public void RemoveObserver(string notificationName, NotificatonHandler handler)
{
RemoveObserver(null, notificationName, handler);
}
public void RemoveObserver(object sender, string notificationName, NotificatonHandler handler)
{
if (handler == null)
{
Debug.LogError("Can't remove a null event handler for notification, " + notificationName);
}
else if (string.IsNullOrEmpty(notificationName))
{
Debug.LogError("A notification name is required to stop observation");
}
else
{
if (!m_EventListeners.ContainsKey(notificationName))
{
return;
}
Dictionary<object, List<NotificatonHandler>> dictionary = m_EventListeners[notificationName];
object key = ((sender != null) ? sender : this);
if (!dictionary.ContainsKey(key))
{
return;
}
List<NotificatonHandler> list = dictionary[key];
int num = list.IndexOf(handler);
if (num != -1)
{
if (m_CurInvokingCallbacks.Contains(list))
{
list = (dictionary[key] = new List<NotificatonHandler>(list));
}
list.RemoveAt(num);
}
}
}
public void Clean()
{
string[] array = new string[m_EventListeners.Keys.Count];
m_EventListeners.Keys.CopyTo(array, 0);
for (int num = array.Length - 1; num >= 0; num--)
{
string key = array[num];
Dictionary<object, List<NotificatonHandler>> dictionary = m_EventListeners[key];
object[] array2 = new object[dictionary.Keys.Count];
dictionary.Keys.CopyTo(array2, 0);
for (int num2 = array2.Length - 1; num2 >= 0; num2--)
{
object key2 = array2[num2];
if (dictionary[key2].Count == 0)
{
dictionary.Remove(key2);
}
}
if (dictionary.Count == 0)
{
m_EventListeners.Remove(key);
}
}
}
public void PostNotification(string notificationName)
{
PostNotification(notificationName, null);
}
public void PostNotification(object sender, string notificationName)
{
PostNotification(sender, notificationName, null);
}
public void PostNotification(object sender, string notificationName, params object[] p)
{
if (string.IsNullOrEmpty(notificationName))
{
Debug.LogError("A notification name is required");
}
else
{
if (!m_EventListeners.ContainsKey(notificationName))
{
return;
}
Dictionary<object, List<NotificatonHandler>> dictionary = m_EventListeners[notificationName];
if (sender != null && dictionary.ContainsKey(sender))
{
List<NotificatonHandler> list = dictionary[sender];
m_CurInvokingCallbacks.Add(list);
for (int i = 0; i < list.Count; i++)
{
list[i](p);
}
m_CurInvokingCallbacks.Remove(list);
}
if (dictionary.ContainsKey(this))
{
List<NotificatonHandler> list2 = dictionary[this];
m_CurInvokingCallbacks.Add(list2);
for (int j = 0; j < list2.Count; j++)
{
list2[j](p);
}
m_CurInvokingCallbacks.Remove(list2);
}
}
}
}
}
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