134 lines
3.5 KiB
C#
134 lines
3.5 KiB
C#
/*
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TShock, a server mod for Terraria
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Copyright (C) 2011-2017 Nyx Studios (fka. The TShock Team)
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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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(at your option) 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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namespace TShockAPI
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{
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public class HandlerList : HandlerList<EventArgs>
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{
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}
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public class HandlerList<T> where T : EventArgs
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{
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public class HandlerItem
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{
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public EventHandler<T> Handler { get; set; }
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public HandlerPriority Priority { get; set; }
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public bool GetHandled { get; set; }
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}
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protected object HandlerLock = new object();
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protected List<HandlerItem> Handlers { get; set; }
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public HandlerList()
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{
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Handlers = new List<HandlerItem>();
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}
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/// <summary>
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/// Register a handler
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/// </summary>
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/// <param name="handler">Delegate to be called</param>
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/// <param name="priority">Priority of the delegate</param>
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/// <param name="gethandled">Should the handler receive a call even if it has been handled</param>
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public void Register(EventHandler<T> handler, HandlerPriority priority = HandlerPriority.Normal, bool gethandled = false)
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{
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Register(Create(handler, priority, gethandled));
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}
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public void Register(HandlerItem obj)
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{
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lock (HandlerLock)
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{
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Handlers.Add(obj);
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Handlers = Handlers.OrderBy(h => (int)h.Priority).ToList();
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}
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}
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public void UnRegister(EventHandler<T> handler)
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{
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lock (HandlerLock)
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{
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Handlers.RemoveAll(h => h.Handler.Equals(handler));
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}
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}
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public void Invoke(object sender, T e)
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{
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List<HandlerItem> handlers;
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lock (HandlerLock)
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{
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//Copy the list for invoking as to not keep it locked during the invokes
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handlers = new List<HandlerItem>(Handlers);
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}
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var hargs = e as HandledEventArgs;
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for (int i = 0; i < handlers.Count; i++)
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{
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if (hargs == null || !hargs.Handled || (hargs.Handled && handlers[i].GetHandled))
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{
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handlers[i].Handler(sender, e);
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}
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}
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}
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public static HandlerItem Create(EventHandler<T> handler, HandlerPriority priority = HandlerPriority.Normal, bool gethandled = false)
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{
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return new HandlerItem { Handler = handler, Priority = priority, GetHandled = gethandled };
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}
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public static HandlerList<T> operator +(HandlerList<T> hand, HandlerItem obj)
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{
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if (hand == null)
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hand = new HandlerList<T>();
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hand.Register(obj);
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return hand;
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}
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public static HandlerList<T> operator +(HandlerList<T> hand, EventHandler<T> handler)
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{
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if (hand == null)
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hand = new HandlerList<T>();
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hand.Register(Create(handler));
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return hand;
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}
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public static HandlerList<T> operator -(HandlerList<T> hand, HandlerItem obj)
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{
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return hand - obj.Handler;
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}
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public static HandlerList<T> operator -(HandlerList<T> hand, EventHandler<T> handler)
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{
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if (hand == null)
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return null;
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hand.UnRegister(handler);
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return hand;
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}
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}
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public enum HandlerPriority
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{
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Highest = 1,
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High = 2,
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Normal = 3,
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Low = 4,
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Lowest = 5,
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}
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}
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