141 lines
3.1 KiB
C#
141 lines
3.1 KiB
C#
//
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// System.ComponentModel.EventHandlerList.cs
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//
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// Author:
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// Miguel de Icaza (miguel@ximian.com)
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// Gonzalo Paniagua Javier (gonzalo@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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using System.Collections.Generic;
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namespace System.ComponentModel {
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internal class ListEntry {
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public object key;
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public Delegate value;
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public ListEntry next;
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}
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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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public sealed class EventHandlerList : IDisposable
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{
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ListEntry entries;
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Delegate null_entry;
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public EventHandlerList ()
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{
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}
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public Delegate this [object key] {
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get {
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if (key == null)
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return null_entry;
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ListEntry entry = FindEntry (key);
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if (entry != null)
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return entry.value;
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else
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return null;
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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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if (key == null) {
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null_entry = Delegate.Combine (null_entry, value);
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return;
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}
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ListEntry entry = FindEntry (key);
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if (entry == null) {
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entry = new ListEntry ();
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entry.key = key;
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entry.value = null;
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entry.next = entries;
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entries = entry;
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}
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entry.value = Delegate.Combine (entry.value, value);
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}
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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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ListEntry entry = listToAddFrom.entries;
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while (entry != null) {
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AddHandler (entry.key, entry.value);
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entry = entry.next;
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}
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}
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public void RemoveHandler (object key, Delegate value)
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{
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if (key == null) {
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null_entry = Delegate.Remove (null_entry, value);
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return;
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}
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ListEntry 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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entries = null;
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}
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private ListEntry FindEntry (object key)
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{
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ListEntry entry = entries;
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while (entry != null) {
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if (entry.key == key)
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return entry;
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entry = entry.next;
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}
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return null;
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}
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}
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}
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