1 // Permission is hereby granted, free of charge, to any person obtaining
2 // a copy of this software and associated documentation files (the
3 // "Software"), to deal in the Software without restriction, including
4 // without limitation the rights to use, copy, modify, merge, publish,
5 // distribute, sublicense, and/or sell copies of the Software, and to
6 // permit persons to whom the Software is furnished to do so, subject to
7 // the following conditions:
9 // The above copyright notice and this permission notice shall be
10 // included in all copies or substantial portions of the Software.
12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 // Copyright (c) 2007 Novell, Inc. (http://www.novell.com)
21 // Copyright 2011 Xamarin Inc.
24 // Chris Toshok (toshok@novell.com)
25 // Brian O'Keefe (zer0keefie@gmail.com)
26 // Marek Safar (marek.safar@gmail.com)
30 using System
.Collections
.Generic
;
31 using System
.Collections
.Specialized
;
32 using System
.ComponentModel
;
33 using System
.Runtime
.CompilerServices
;
35 namespace System
.Collections
.ObjectModel
39 [TypeForwardedFrom (Consts
.WindowsBase_3_0
)]
41 public class ObservableCollection
<T
> : Collection
<T
>, INotifyCollectionChanged
, INotifyPropertyChanged
{
44 [TypeForwardedFrom (Consts
.WindowsBase_3_0
)]
46 sealed class SimpleMonitor
: IDisposable
{
47 private int _busyCount
= 0;
49 public SimpleMonitor()
65 get { return _busyCount > 0; }
69 private SimpleMonitor _monitor
= new SimpleMonitor ();
71 public ObservableCollection ()
75 public ObservableCollection (IEnumerable
<T
> collection
)
77 if (collection
== null)
78 throw new ArgumentNullException ("collection");
80 foreach (var item
in collection
)
84 public ObservableCollection (List
<T
> list
)
85 : base (list
!= null ? new List
<T
> (list
) : null)
89 [field
:NonSerializedAttribute()]
90 public virtual event NotifyCollectionChangedEventHandler CollectionChanged
;
91 [field
:NonSerializedAttribute()]
92 protected virtual event PropertyChangedEventHandler PropertyChanged
;
94 event PropertyChangedEventHandler INotifyPropertyChanged
.PropertyChanged
{
95 add { this.PropertyChanged += value; }
96 remove { this.PropertyChanged -= value; }
99 protected IDisposable
BlockReentrancy ()
105 protected void CheckReentrancy ()
107 NotifyCollectionChangedEventHandler eh
= CollectionChanged
;
109 // Only have a problem if we have more than one event listener.
110 if (_monitor
.Busy
&& eh
!= null && eh
.GetInvocationList ().Length
> 1)
111 throw new InvalidOperationException ("Cannot modify the collection while reentrancy is blocked.");
114 protected override void ClearItems ()
120 OnCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction
.Reset
));
121 OnPropertyChanged (new PropertyChangedEventArgs ("Count"));
122 OnPropertyChanged (new PropertyChangedEventArgs ("Item[]"));
125 protected override void InsertItem (int index
, T item
)
129 base.InsertItem (index
, item
);
131 OnCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction
.Add
, item
, index
));
132 OnPropertyChanged (new PropertyChangedEventArgs ("Count"));
133 OnPropertyChanged (new PropertyChangedEventArgs ("Item[]"));
136 public void Move (int oldIndex
, int newIndex
)
138 MoveItem (oldIndex
, newIndex
);
141 protected virtual void MoveItem (int oldIndex
, int newIndex
)
145 T item
= Items
[oldIndex
];
146 base.RemoveItem (oldIndex
);
147 base.InsertItem (newIndex
, item
);
149 OnCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction
.Move
, item
, newIndex
, oldIndex
));
150 OnPropertyChanged (new PropertyChangedEventArgs ("Item[]"));
153 protected virtual void OnCollectionChanged (NotifyCollectionChangedEventArgs e
)
155 NotifyCollectionChangedEventHandler eh
= CollectionChanged
;
158 // Make sure that the invocation is done before the collection changes,
159 // Otherwise there's a chance of data corruption.
160 using (BlockReentrancy ()) {
166 protected virtual void OnPropertyChanged (PropertyChangedEventArgs e
)
168 PropertyChangedEventHandler eh
= PropertyChanged
;
174 protected override void RemoveItem (int index
)
178 T item
= Items
[index
];
180 base.RemoveItem (index
);
182 OnCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction
.Remove
, item
, index
));
183 OnPropertyChanged (new PropertyChangedEventArgs ("Count"));
184 OnPropertyChanged (new PropertyChangedEventArgs ("Item[]"));
187 protected override void SetItem (int index
, T item
)
191 T oldItem
= Items
[index
];
193 base.SetItem (index
, item
);
195 OnCollectionChanged (new NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction
.Replace
, item
, oldItem
, index
));
196 OnPropertyChanged (new PropertyChangedEventArgs ("Item[]"));