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//
// System.ComponentModel.EventHandlerList.cs
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) Ximian, Inc. http://www.ximian.com
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
namespace System.ComponentModel {
// <summary>
// List of Event delegates.
// </summary>
//
// <remarks>
// Longer description
// </remarks>
public sealed class EventHandlerList : IDisposable {
public EventHandlerList ()
{
head = null;
}
public Delegate this [object key] {
get {
ListNode entry = FindEntry (key);
return entry == null ? null : entry.value;
}
set {
AddHandler (key, value);
}
}
public void AddHandler (object key, Delegate value)
{
ListNode entry = FindEntry (key);
if (entry == null) {
head = new ListNode (key, value, head);
return;
}
entry.value = Delegate.Combine (entry.value, value);
}
public void RemoveHandler (object key, Delegate value)
{
ListNode entry = FindEntry (key);
if (entry == null)
return;
entry.value = Delegate.Remove (entry.value, value);
}
public void Dispose ()
{
head = null;
}
private ListNode FindEntry (object key)
{
if (key == null)
throw new ArgumentNullException ("key", "Attempted lookup for a null key.");
for (ListNode entry = head; entry != null; entry = entry.next)
if (key == entry.key)
return entry;
return null;
}
[Serializable]
private class ListNode
{
public object key;
public Delegate value;
public ListNode next;
public ListNode (object key, Delegate value, ListNode next)
{
this.key = key;
this.value = value;
this.next = next;
}
}
private ListNode head;
}
}
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