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Viewing changes to class/System.Windows/Mono/EventHandlerList.cs

  • Committer: Bazaar Package Importer
  • Author(s): Jo Shields
  • Date: 2009-02-14 12:01:08 UTC
  • Revision ID: james.westby@ubuntu.com-20090214120108-06539vb25vhbd8bn
Tags: upstream-1.0
Import upstream version 1.0

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class/System.Windows/Mono/EventHandlerList.cs
 
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//
 
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// System.ComponentModel.EventHandlerList.cs
 
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//
 
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// Contact:
 
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//   Moonlight List (moonlight-list@lists.ximian.com)
 
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//
 
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// (C) Ximian, Inc.  http://www.ximian.com
 
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//
 
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//
 
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// Permission is hereby granted, free of charge, to any person obtaining
 
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// a copy of this software and associated documentation files (the
 
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// "Software"), to deal in the Software without restriction, including
 
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// without limitation the rights to use, copy, modify, merge, publish,
 
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// distribute, sublicense, and/or sell copies of the Software, and to
 
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// permit persons to whom the Software is furnished to do so, subject to
 
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// the following conditions:
 
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// 
 
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// The above copyright notice and this permission notice shall be
 
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// included in all copies or substantial portions of the Software.
 
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// 
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
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//
 
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using System;
 
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using System.Collections;
 
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namespace Mono {
 
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        // <summary>
 
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        //   List of Event delegates.
 
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        // </summary>
 
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        //
 
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        // <remarks>
 
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        //   Longer description
 
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        // </remarks>
 
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        sealed class EventHandlerList : IDisposable {
 
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                public EventHandlerList ()
 
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                {
 
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                        head = null;
 
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                }
 
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                public Delegate this [object key] {
 
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                        get {
 
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                                ListNode entry = FindEntry (key);
 
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                                return entry == null ? null : entry.value;
 
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                        }
 
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                        set {
 
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                                AddHandler (key, value);
 
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                        }
 
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                }
 
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                public void AddHandler (object key, Delegate value)
 
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                {
 
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                        ListNode entry = FindEntry (key);
 
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                        if (entry == null) {
 
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                                head = new ListNode (key, value, head);
 
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                                return;
 
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                        }
 
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                        entry.value = Delegate.Combine (entry.value, value);
 
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                }
 
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#if NET_2_0
 
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                public void AddHandlers (EventHandlerList listToAddFrom)
 
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                {
 
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                        if (listToAddFrom == null) {
 
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                                return;
 
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                        }
 
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                        for (ListNode entry = listToAddFrom.head; entry != null; entry = entry.next) {
 
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                                AddHandler (entry.key, entry.value);
 
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                        }
 
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                }
 
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#endif
 
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                public void RemoveHandler (object key, Delegate value)
 
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                {
 
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                        ListNode entry = FindEntry (key);
 
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                        if (entry == null)
 
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                                return;
 
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                        entry.value = Delegate.Remove (entry.value, value);
 
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                }
 
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                public void Dispose ()
 
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                {
 
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                        head = null;
 
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                }
 
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                private ListNode FindEntry (object key)
 
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                {
 
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                        for (ListNode entry = head; entry != null; entry = entry.next)
 
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                                if (key == entry.key)
 
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                                        return entry;
 
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                        return null;
 
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                }
 
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                private class ListNode
 
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                {
 
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                        public object key;
 
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                        public Delegate value;
 
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                        public ListNode next;
 
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                        public ListNode (object key, Delegate value, ListNode next)
 
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                        {
 
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                                this.key = key;
 
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                                this.value = value;
 
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                                this.next = next;
 
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                        }
 
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                }
 
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                private ListNode head;
 
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        }
 
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}