Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / LostFocusEventManager.cs / 1305600 / LostFocusEventManager.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: Manager for the LostFocus event in the "weak event listener" // pattern. See WeakEventTable.cs for an overview. // //--------------------------------------------------------------------------- using System; using System.Windows; // WeakEventManager using MS.Internal; // Helper namespace System.Windows { ////// Manager for the DependencyObject.LostFocus event. /// public class LostFocusEventManager : WeakEventManager { #region Constructors // // Constructors // private LostFocusEventManager() { } #endregion Constructors #region Public Methods // // Public Methods // ////// Add a listener to the given source's event. /// public static void AddListener(DependencyObject 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(DependencyObject source, IWeakEventListener listener) { 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) { DependencyObject typedSource = (DependencyObject)source; FrameworkElement fe; FrameworkContentElement fce; Helper.DowncastToFEorFCE(typedSource, out fe, out fce, true); if (fe != null) fe.LostFocus += new RoutedEventHandler(OnLostFocus); else if (fce != null) fce.LostFocus += new RoutedEventHandler(OnLostFocus); } ////// Stop listening to the given source for the event. /// protected override void StopListening(object source) { DependencyObject typedSource = (DependencyObject)source; FrameworkElement fe; FrameworkContentElement fce; Helper.DowncastToFEorFCE(typedSource, out fe, out fce, true); if (fe != null) fe.LostFocus -= new RoutedEventHandler(OnLostFocus); else if (fce != null) fce.LostFocus -= new RoutedEventHandler(OnLostFocus); } #endregion Protected Methods #region Private Properties // // Private Properties // // get the event manager for the current thread private static LostFocusEventManager CurrentManager { get { Type managerType = typeof(LostFocusEventManager); LostFocusEventManager manager = (LostFocusEventManager)GetCurrentManager(managerType); // at first use, create and register a new manager if (manager == null) { manager = new LostFocusEventManager(); SetCurrentManager(managerType, manager); } return manager; } } #endregion Private Properties #region Private Methods // // Private Methods // // event handler for LostFocus event private void OnLostFocus(object sender, RoutedEventArgs 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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