From 6437d2a9774239f092d4c05db6c93875b05d51d6 Mon Sep 17 00:00:00 2001
From: high <pooop828@hotmail.com>
Date: Fri, 30 Dec 2011 20:32:03 -0500
Subject: [PATCH] Added HandlerList.cs so that we can have prioritized event
 handlers also so you can easily register a handler and not have to put 'if
 (e.Handled) return;' at the top.

---
 TShockAPI/GetDataHandlers.cs |  7 +---
 TShockAPI/HandlerList.cs     | 79 ++++++++++++++++++++++++++++++++++++
 TShockAPI/TShockAPI.csproj   |  3 +-
 3 files changed, 83 insertions(+), 6 deletions(-)
 create mode 100644 TShockAPI/HandlerList.cs

diff --git a/TShockAPI/GetDataHandlers.cs b/TShockAPI/GetDataHandlers.cs
index f18dca77..7c9b2dbd 100644
--- a/TShockAPI/GetDataHandlers.cs
+++ b/TShockAPI/GetDataHandlers.cs
@@ -58,12 +58,9 @@ namespace TShockAPI
 			public float Type { get; set; }
 			public float EditType { get; set; }
 		}
-		public static event EventHandler<TileEditEventArgs> TileEdit;
+		public static HandlerList<TileEditEventArgs> TileEdit = new HandlerList<TileEditEventArgs>();
 		public static bool OnTileEdit(float x, float y, float type, float editType)
 		{
-			if (TileEdit == null)
-				return false;
-
 			var args = new TileEditEventArgs
 			{
 				X = x,
@@ -71,7 +68,7 @@ namespace TShockAPI
 				Type = type,
 				EditType = editType
 			};
-			TileEdit(null, args);
+			TileEdit.Invoke(null, args);
 			return args.Handled;
 		}
 		#endregion
diff --git a/TShockAPI/HandlerList.cs b/TShockAPI/HandlerList.cs
new file mode 100644
index 00000000..f411efc5
--- /dev/null
+++ b/TShockAPI/HandlerList.cs
@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+
+namespace TShockAPI
+{
+	public class HandlerList : HandlerList<EventArgs>
+	{
+	}
+	public class HandlerList<T> where T : EventArgs
+	{
+		protected class HandlerObject
+		{
+			public EventHandler<T> Handler { get; set; }
+			public HandlerPriority Priority { get; set; }
+			public bool GetHandled { get; set; }
+		}
+
+		protected object HandlerLock = new object();
+		protected List<HandlerObject> Handlers { get; set; }
+		public HandlerList()
+		{
+			Handlers = new List<HandlerObject>();
+		}
+
+		/// <summary>
+		/// Register a handler
+		/// </summary>
+		/// <param name="handler">Delegate to be called</param>
+		/// <param name="priority">Priority of the delegate</param>
+		/// <param name="gethandled">Should the handler receive a call even if it has been handled</param>
+		public void Register(EventHandler<T> handler, HandlerPriority priority = HandlerPriority.Normal, bool gethandled = false)
+		{
+			lock (HandlerLock)
+			{
+				Handlers.Add(new HandlerObject { Handler = handler, Priority = priority, GetHandled = gethandled });
+				Handlers = Handlers.OrderBy(h => (int)h.Priority).ToList();
+			}
+		}
+
+		public void UnRegister(EventHandler<T> handler)
+		{
+			lock (HandlerLock)
+			{
+				Handlers.RemoveAll(h => h.Handler.Equals(handler));
+			}
+		}
+
+		public void Invoke(object sender, T e)
+		{
+			List<HandlerObject> handlers;
+			lock (HandlerLock)
+			{
+				//Copy the list for invoking as to not keep it locked during the invokes
+				handlers = new List<HandlerObject>(Handlers);
+			}
+
+			var hargs = e as HandledEventArgs;
+			for (int i = 0; i < handlers.Count; i++)
+			{
+				if (hargs == null || !hargs.Handled || (hargs.Handled && handlers[i].GetHandled))
+				{
+					handlers[i].Handler(sender, e);
+				}
+			}
+		}
+	}
+
+	public enum HandlerPriority
+	{
+		Highest = 1,
+		High = 2,
+		Normal = 3,
+		Low = 4,
+		Lowest = 5,
+	}
+}
diff --git a/TShockAPI/TShockAPI.csproj b/TShockAPI/TShockAPI.csproj
index 6149414f..717b35e4 100644
--- a/TShockAPI/TShockAPI.csproj
+++ b/TShockAPI/TShockAPI.csproj
@@ -96,6 +96,7 @@
     <Compile Include="Extensions\RandomExt.cs" />
     <Compile Include="Extensions\StringExt.cs" />
     <Compile Include="GeoIPCountry.cs" />
+    <Compile Include="HandlerList.cs" />
     <Compile Include="IPackable.cs" />
     <Compile Include="Commands.cs" />
     <Compile Include="ConfigFile.cs" />
@@ -183,7 +184,7 @@
   </PropertyGroup>
   <ProjectExtensions>
     <VisualStudio>
-      <UserProperties BuildVersion_UpdateAssemblyVersion="True" BuildVersion_UpdateFileVersion="True" BuildVersion_BuildAction="Both" BuildVersion_BuildVersioningStyle="None.None.None.MonthAndDayStamp" BuildVersion_StartDate="2011/6/17" BuildVersion_IncrementBeforeBuild="False" />
+      <UserProperties BuildVersion_IncrementBeforeBuild="False" BuildVersion_StartDate="2011/6/17" BuildVersion_BuildVersioningStyle="None.None.None.MonthAndDayStamp" BuildVersion_BuildAction="Both" BuildVersion_UpdateFileVersion="True" BuildVersion_UpdateAssemblyVersion="True" />
     </VisualStudio>
   </ProjectExtensions>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.