Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / System / ComponentModel / CurrentChangingEventManager.cs / 1 / CurrentChangingEventManager.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Manager for the CurrentChanging event in the "weak event listener" // pattern. See WeakEventTable.cs for an overview. // //--------------------------------------------------------------------------- using System; using System.ComponentModel; // ICollectionView.CurrentChanging using System.Windows; // WeakEventManager namespace System.ComponentModel { ////// Manager for the ICollectionView.CurrentChanging event. /// public class CurrentChangingEventManager : WeakEventManager { #region Constructors // // Constructors // private CurrentChangingEventManager() { } #endregion Constructors #region Public Methods // // Public Methods // ////// Add a listener to the given source's event. /// public static void AddListener(ICollectionView source, IWeakEventListener listener) { CurrentManager.ProtectedAddListener(source, listener); } ////// Remove a listener to the given source's event. /// public static void RemoveListener(ICollectionView source, IWeakEventListener 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) { ICollectionView typedSource = (ICollectionView)source; typedSource.CurrentChanging += new CurrentChangingEventHandler(OnCurrentChanging); } ////// Stop listening to the given source for the event. /// protected override void StopListening(object source) { ICollectionView typedSource = (ICollectionView)source; typedSource.CurrentChanging -= new CurrentChangingEventHandler(OnCurrentChanging); } #endregion Protected Methods #region Private Properties // // Private Properties // // get the event manager for the current thread private static CurrentChangingEventManager CurrentManager { get { Type managerType = typeof(CurrentChangingEventManager); CurrentChangingEventManager manager = (CurrentChangingEventManager)GetCurrentManager(managerType); // at first use, create and register a new manager if (manager == null) { manager = new CurrentChangingEventManager(); SetCurrentManager(managerType, manager); } return manager; } } #endregion Private Properties #region Private Methods // // Private Methods // // event handler for CurrentChanging event private void OnCurrentChanging(object sender, CurrentChangingEventArgs 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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