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// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (c) 2007 Novell, Inc. (http://www.novell.com)
// Copyright 2011 Xamarin Inc.
//
// Authors:
// Chris Toshok (toshok@novell.com)
// Brian O'Keefe (zer0keefie@gmail.com)
// Marek Safar (marek.safar@gmail.com)
//
#if NET_4_0
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace System.Collections.ObjectModel
{
[Serializable]
#if !MOBILE
[TypeForwardedFrom (Consts.WindowsBase_3_0)]
#endif
public class ObservableCollection<T> : Collection<T>, INotifyCollectionChanged, INotifyPropertyChanged {
[Serializable]
#if !MOBILE
[TypeForwardedFrom (Consts.WindowsBase_3_0)]
#endif
sealed class SimpleMonitor : IDisposable {
private int _busyCount;
public SimpleMonitor()
{
}
public void Enter()
{
_busyCount++;
}
public void Dispose()
{
_busyCount--;
}
public bool Busy
{
get { return _busyCount > 0; }
}
}
private SimpleMonitor _monitor = new SimpleMonitor ();
public ObservableCollection ()
{
}
public ObservableCollection (IEnumerable<T> collection)
{
if (collection == null)
throw new ArgumentNullException ("collection");
foreach (var item in collection)
Add (item);
}
public ObservableCollection (List<T> list)
: base (list != null ? new List<T> (list) : null)
{
}
[field:NonSerialized]
public virtual event NotifyCollectionChangedEventHandler CollectionChanged;
[field:NonSerialized]
protected virtual event PropertyChangedEventHandler PropertyChanged;
event PropertyChangedEventHandler INotifyPropertyChanged.PropertyChanged {
add { this.PropertyChanged += value; }
remove { this.PropertyChanged -= value; }
}
protected IDisposable BlockReentrancy ()
{
_monitor.Enter ();
return _monitor;
}
protected void CheckReentrancy ()
{
NotifyCollectionChangedEventHandler eh = CollectionChanged;
// Only have a problem if we have more than one event listener.
if (_monitor.Busy && eh != null && eh.GetInvocationList ().Length > 1)
throw new InvalidOperationException ("Cannot modify the collection while reentrancy is blocked.");
}
protected override void ClearItems ()
{
CheckReentrancy ();
base.ClearItems ();
OnCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction.Reset));
OnPropertyChanged (new PropertyChangedEventArgs ("Count"));
OnPropertyChanged (new PropertyChangedEventArgs ("Item[]"));
}
protected override void InsertItem (int index, T item)
{
CheckReentrancy ();
base.InsertItem (index, item);
OnCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction.Add, item, index));
OnPropertyChanged (new PropertyChangedEventArgs ("Count"));
OnPropertyChanged (new PropertyChangedEventArgs ("Item[]"));
}
public void Move (int oldIndex, int newIndex)
{
MoveItem (oldIndex, newIndex);
}
protected virtual void MoveItem (int oldIndex, int newIndex)
{
CheckReentrancy ();
T item = Items [oldIndex];
base.RemoveItem (oldIndex);
base.InsertItem (newIndex, item);
OnCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction.Move, item, newIndex, oldIndex));
OnPropertyChanged (new PropertyChangedEventArgs ("Item[]"));
}
protected virtual void OnCollectionChanged (NotifyCollectionChangedEventArgs e)
{
NotifyCollectionChangedEventHandler eh = CollectionChanged;
if (eh != null) {
// Make sure that the invocation is done before the collection changes,
// Otherwise there's a chance of data corruption.
using (BlockReentrancy ()) {
eh (this, e);
}
}
}
protected virtual void OnPropertyChanged (PropertyChangedEventArgs e)
{
PropertyChangedEventHandler eh = PropertyChanged;
if (eh != null)
eh (this, e);
}
protected override void RemoveItem (int index)
{
CheckReentrancy ();
T item = Items [index];
base.RemoveItem (index);
OnCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction.Remove, item, index));
OnPropertyChanged (new PropertyChangedEventArgs ("Count"));
OnPropertyChanged (new PropertyChangedEventArgs ("Item[]"));
}
protected override void SetItem (int index, T item)
{
CheckReentrancy ();
T oldItem = Items [index];
base.SetItem (index, item);
OnCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction.Replace, item, oldItem, index));
OnPropertyChanged (new PropertyChangedEventArgs ("Item[]"));
}
}
}
#endif
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