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//---------------------------------------------------------------------------
//
// <copyright file="CurrentChangingEventManager.cs" company="Microsoft">
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
// 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
{
/// <summary>
/// Manager for the ICollectionView.CurrentChanging event.
/// </summary>
public class CurrentChangingEventManager : WeakEventManager
{
#region Constructors
//
// Constructors
//
private CurrentChangingEventManager()
{
}
#endregion Constructors
#region Public Methods
//
// Public Methods
//
/// <summary>
/// Add a listener to the given source's event.
/// </summary>
public static void AddListener(ICollectionView source, IWeakEventListener listener)
{
if (source == null)
throw new ArgumentNullException("source");
if (listener == null)
throw new ArgumentNullException("listener");
CurrentManager.ProtectedAddListener(source, listener);
}
/// <summary>
/// Remove a listener to the given source's event.
/// </summary>
public static void RemoveListener(ICollectionView 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);
}
/// <summary>
/// Add a handler for the given source's event.
/// </summary>
public static void AddHandler(ICollectionView source, EventHandler<CurrentChangingEventArgs> handler)
{
if (handler == null)
throw new ArgumentNullException("handler");
CurrentManager.ProtectedAddHandler(source, handler);
}
/// <summary>
/// Remove a handler for the given source's event.
/// </summary>
public static void RemoveHandler(ICollectionView source, EventHandler<CurrentChangingEventArgs> handler)
{
if (handler == null)
throw new ArgumentNullException("handler");
CurrentManager.ProtectedRemoveHandler(source, handler);
}
#endregion Public Methods
#region Protected Methods
//
// Protected Methods
//
/// <summary>
/// Return a new list to hold listeners to the event.
/// </summary>
protected override ListenerList NewListenerList()
{
return new ListenerList<CurrentChangingEventArgs>();
}
/// <summary>
/// Listen to the given source for the event.
/// </summary>
protected override void StartListening(object source)
{
ICollectionView typedSource = (ICollectionView)source;
typedSource.CurrentChanging += new CurrentChangingEventHandler(OnCurrentChanging);
}
/// <summary>
/// Stop listening to the given source for the event.
/// </summary>
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
}
}
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