Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / System / Collections / Specialized / CollectionChangedEventManager.cs / 1305600 / CollectionChangedEventManager.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Manager for the CollectionChanged event in the "weak event listener" // pattern. See WeakEventTable.cs for an overview. // //--------------------------------------------------------------------------- using System; using System.Windows; // WeakEventManager namespace System.Collections.Specialized { ////// Manager for the INotifyCollectionChanged.CollectionChanged event. /// public class CollectionChangedEventManager : WeakEventManager { #region Constructors // // Constructors // private CollectionChangedEventManager() { } #endregion Constructors #region Public Methods // // Public Methods // ////// Add a listener to the given source's event. /// public static void AddListener(INotifyCollectionChanged source, IWeakEventListener listener) { if (source == null) throw new ArgumentNullException("source"); if (listener == null) throw new ArgumentNullException("listener"); CurrentManager.ProtectedAddListener(source, listener); } ////// Remove a listener to the given source's event. /// public static void RemoveListener(INotifyCollectionChanged source, IWeakEventListener listener) { /* for app-compat, allow RemoveListener(null, x) - it's a no-op (see Dev10 796788) if (source == null) throw new ArgumentNullException("source"); */ if (listener == null) throw new ArgumentNullException("listener"); CurrentManager.ProtectedRemoveListener(source, listener); } #endregion Public Methods #region Protected Methods // // Protected Methods // ////// Listen to the given source for the event. /// protected override void StartListening(object source) { INotifyCollectionChanged typedSource = (INotifyCollectionChanged)source; typedSource.CollectionChanged += new NotifyCollectionChangedEventHandler(OnCollectionChanged); } ////// Stop listening to the given source for the event. /// protected override void StopListening(object source) { INotifyCollectionChanged typedSource = (INotifyCollectionChanged)source; typedSource.CollectionChanged -= new NotifyCollectionChangedEventHandler(OnCollectionChanged); } #endregion Protected Methods #region Private Properties // // Private Properties // // get the event manager for the current thread private static CollectionChangedEventManager CurrentManager { get { Type managerType = typeof(CollectionChangedEventManager); CollectionChangedEventManager manager = (CollectionChangedEventManager)GetCurrentManager(managerType); // at first use, create and register a new manager if (manager == null) { manager = new CollectionChangedEventManager(); SetCurrentManager(managerType, manager); } return manager; } } #endregion Private Properties #region Private Methods // // Private Methods // // event handler for CollectionChanged event private void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs args) { DeliverEvent(sender, args); } #endregion Private Methods } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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