CurrentChangedEventManager.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Base / System / ComponentModel / CurrentChangedEventManager.cs / 1 / CurrentChangedEventManager.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: Manager for the CurrentChanged event in the "weak event listener" 
//              pattern.  See WeakEventTable.cs for an overview. 
//
//--------------------------------------------------------------------------- 

using System;
using System.Windows;       // WeakEventManager
 
namespace System.ComponentModel
{ 
    ///  
    /// Manager for the ICollectionView.CurrentChanged event.
    ///  
    public class CurrentChangedEventManager : WeakEventManager
    {
        #region Constructors
 
        //
        //  Constructors 
        // 

        private CurrentChangedEventManager() 
        {
        }

        #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.CurrentChanged += new EventHandler(OnCurrentChanged); 
        } 

        ///  
        /// Stop listening to the given source for the event.
        /// 
        protected override void StopListening(object source)
        { 
            ICollectionView typedSource = (ICollectionView)source;
            typedSource.CurrentChanged -= new EventHandler(OnCurrentChanged); 
        } 

        #endregion Protected Methods 

        #region Private Properties

        // 
        //  Private Properties
        // 
 
        // get the event manager for the current thread
        private static CurrentChangedEventManager CurrentManager 
        {
            get
            {
                Type managerType = typeof(CurrentChangedEventManager); 
                CurrentChangedEventManager manager = (CurrentChangedEventManager)GetCurrentManager(managerType);
 
                // at first use, create and register a new manager 
                if (manager == null)
                { 
                    manager = new CurrentChangedEventManager();
                    SetCurrentManager(managerType, manager);
                }
 
                return manager;
            } 
        } 

        #endregion Private Properties 

        #region Private Methods

        // 
        //  Private Methods
        // 
 
        // event handler for CurrentChanged event
        private void OnCurrentChanged(object sender, EventArgs 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.
//---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: Manager for the CurrentChanged event in the "weak event listener" 
//              pattern.  See WeakEventTable.cs for an overview. 
//
//--------------------------------------------------------------------------- 

using System;
using System.Windows;       // WeakEventManager
 
namespace System.ComponentModel
{ 
    ///  
    /// Manager for the ICollectionView.CurrentChanged event.
    ///  
    public class CurrentChangedEventManager : WeakEventManager
    {
        #region Constructors
 
        //
        //  Constructors 
        // 

        private CurrentChangedEventManager() 
        {
        }

        #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.CurrentChanged += new EventHandler(OnCurrentChanged); 
        } 

        ///  
        /// Stop listening to the given source for the event.
        /// 
        protected override void StopListening(object source)
        { 
            ICollectionView typedSource = (ICollectionView)source;
            typedSource.CurrentChanged -= new EventHandler(OnCurrentChanged); 
        } 

        #endregion Protected Methods 

        #region Private Properties

        // 
        //  Private Properties
        // 
 
        // get the event manager for the current thread
        private static CurrentChangedEventManager CurrentManager 
        {
            get
            {
                Type managerType = typeof(CurrentChangedEventManager); 
                CurrentChangedEventManager manager = (CurrentChangedEventManager)GetCurrentManager(managerType);
 
                // at first use, create and register a new manager 
                if (manager == null)
                { 
                    manager = new CurrentChangedEventManager();
                    SetCurrentManager(managerType, manager);
                }
 
                return manager;
            } 
        } 

        #endregion Private Properties 

        #region Private Methods

        // 
        //  Private Methods
        // 
 
        // event handler for CurrentChanged event
        private void OnCurrentChanged(object sender, EventArgs 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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CurrentChangedEventManager.cs source code in C# .NET

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