2 // System.ComponentModel.EventHandlerList.cs
5 // Miguel de Icaza (miguel@ximian.com)
6 // Gonzalo Paniagua Javier (gonzalo@ximian.com)
8 // (C) Ximian, Inc. http://www.ximian.com
12 // Permission is hereby granted, free of charge, to any person obtaining
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14 // "Software"), to deal in the Software without restriction, including
15 // without limitation the rights to use, copy, modify, merge, publish,
16 // distribute, sublicense, and/or sell copies of the Software, and to
17 // permit persons to whom the Software is furnished to do so, subject to
18 // the following conditions:
20 // The above copyright notice and this permission notice shall be
21 // included in all copies or substantial portions of the Software.
23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 using System.Collections;
35 namespace System.ComponentModel {
38 // List of Event delegates.
44 public sealed class EventHandlerList : IDisposable {
45 public EventHandlerList ()
50 public Delegate this [object key] {
52 ListNode entry = FindEntry (key);
53 return entry == null ? null : entry.value;
57 AddHandler (key, value);
61 public void AddHandler (object key, Delegate value)
63 ListNode entry = FindEntry (key);
65 head = new ListNode (key, value, head);
68 entry.value = Delegate.Combine (entry.value, value);
72 public void AddHandlers (EventHandlerList listToAddFrom)
74 if (listToAddFrom == null) {
78 for (ListNode entry = listToAddFrom.head; entry != null; entry = entry.next) {
79 AddHandler (entry.key, entry.value);
84 public void RemoveHandler (object key, Delegate value)
86 ListNode entry = FindEntry (key);
90 entry.value = Delegate.Remove (entry.value, value);
93 public void Dispose ()
97 private ListNode FindEntry (object key)
99 for (ListNode entry = head; entry != null; entry = entry.next)
100 if (key == entry.key)
106 private class ListNode
109 public Delegate value;
110 public ListNode next;
111 public ListNode (object key, Delegate value, ListNode next)
119 private ListNode head;