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//---------------------------------------------------------------------------
//
// <copyright file="ItemsChangedEventArgs.cs" company="Microsoft">
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
// Description: Delegate and args for the ItemsChanged event.
//
// Specs: http://avalon/connecteddata/M5%20General%20Docs/Data%20Styling.mht
//
//---------------------------------------------------------------------------
using System;
using System.Collections.Specialized;
using System.ComponentModel;
namespace System.Windows.Controls.Primitives
{
/// <summary>
/// The ItemsChanged event is raised by an ItemContainerGenerator to inform
/// layouts that the items collection has changed.
/// </summary>
public class ItemsChangedEventArgs : EventArgs
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
internal ItemsChangedEventArgs(NotifyCollectionChangedAction action,
GeneratorPosition position,
GeneratorPosition oldPosition,
int itemCount,
int itemUICount)
{
_action = action;
_position = position;
_oldPosition = oldPosition;
_itemCount = itemCount;
_itemUICount = itemUICount;
}
internal ItemsChangedEventArgs(NotifyCollectionChangedAction action,
GeneratorPosition position,
int itemCount,
int itemUICount) : this(action, position, new GeneratorPosition(-1, 0), itemCount, itemUICount)
{
}
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
/// <summary> What happened </summary>
public NotifyCollectionChangedAction Action { get { return _action; } }
/// <summary> Where it happened </summary>
public GeneratorPosition Position { get { return _position; } }
/// <summary> Where it happened </summary>
public GeneratorPosition OldPosition { get { return _oldPosition; } }
/// <summary> How many items were involved </summary>
public int ItemCount { get { return _itemCount; } }
/// <summary> How many UI elements were involved </summary>
public int ItemUICount { get { return _itemUICount; } }
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
NotifyCollectionChangedAction _action;
GeneratorPosition _position;
GeneratorPosition _oldPosition;
int _itemCount;
int _itemUICount;
}
/// <summary>
/// The delegate to use for handlers that receive ItemsChangedEventArgs.
/// </summary>
public delegate void ItemsChangedEventHandler(object sender, ItemsChangedEventArgs e);
}
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