class/System.Windows/System.Collections.Specialized/NotifyCollectionChangedEventArgs.cs

   1 //
   2 // NotifyCollectionChangedEventArgs.cs
   3 //
   4 // Contact:
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   6 //
   7 // Copyright 2008 Novell, Inc.
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 using System.Collections.Generic;
  29
  30 namespace System.Collections.Specialized {
  31
  32         public sealed class NotifyCollectionChangedEventArgs : EventArgs {
  33                 List<object> new_items, old_items;
  34
  35                 public NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction action)
  36                 {
  37                         if (action != NotifyCollectionChangedAction.Reset)
  38                                 throw new NotSupportedException ();
  39
  40                         Action = action;
  41                         NewStartingIndex = -1;
  42                         OldStartingIndex = -1;
  43                 }
  44
  45                 public NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction action, object changedItem, int index)
  46                 {
  47                         switch (action) {
  48                         case NotifyCollectionChangedAction.Add:
  49                                 new_items = new List<object>();
  50                                 new_items.Add (changedItem);
  51                                 NewStartingIndex = index;
  52                                 OldStartingIndex = -1;
  53                                 break;
  54                         case NotifyCollectionChangedAction.Remove:
  55                                 old_items = new List<object>();
  56                                 old_items.Add (changedItem);
  57                                 OldStartingIndex = index;
  58                                 NewStartingIndex = -1;
  59                                 break;
  60                         default:
  61                                 throw new NotSupportedException ();
  62                         }
  63
  64                         Action = action;
  65                 }
  66
  67                 public NotifyCollectionChangedEventArgs (NotifyCollectionChangedAction action, object newItem, object oldItem, int index)
  68                 {
  69                         if (action != NotifyCollectionChangedAction.Replace)
  70                                 throw new NotSupportedException ();
  71
  72                         Action = action;
  73
  74                         new_items = new List<object>();
  75                         new_items.Add (newItem);
  76
  77                         old_items = new List<object>();
  78                         old_items.Add (oldItem);
  79
  80                         NewStartingIndex = index;
  81                         OldStartingIndex = -1;
  82                 }
  83
  84                 public NotifyCollectionChangedAction Action { get; private set; }
  85
  86                 public IList NewItems {
  87                         get { return new_items; }
  88                 }
  89
  90                 public IList OldItems {
  91                         get { return old_items; }
  92                 }
  93
  94                 public int NewStartingIndex { get; private set; }
  95                 public int OldStartingIndex { get; private set; }
  96         }
  97 }