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/source/library/Interlace/Collections/TrackedCollection.cs

https://bitbucket.org/VahidN/interlace
C# | 91 lines | 46 code | 14 blank | 31 comment | 12 complexity | 0508387955cdc9df09b854a1e96dfa5e MD5 | raw file
  1. #region Using Directives and Copyright Notice
  2. // Copyright (c) 2007-2010, Computer Consultancy Pty Ltd
  3. // All rights reserved.
  4. //
  5. // Redistribution and use in source and binary forms, with or without
  6. // modification, are permitted provided that the following conditions are met:
  7. // * Redistributions of source code must retain the above copyright
  8. // notice, this list of conditions and the following disclaimer.
  9. // * Redistributions in binary form must reproduce the above copyright
  10. // notice, this list of conditions and the following disclaimer in the
  11. // documentation and/or other materials provided with the distribution.
  12. // * Neither the name of the Computer Consultancy Pty Ltd nor the
  13. // names of its contributors may be used to endorse or promote products
  14. // derived from this software without specific prior written permission.
  15. //
  16. // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17. // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18. // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19. // ARE DISCLAIMED. IN NO EVENT SHALL COMPUTER CONSULTANCY PTY LTD BE LIABLE
  20. // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21. // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22. // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  23. // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24. // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25. // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  26. // DAMAGE.
  27. using System;
  28. using System.Collections.Generic;
  29. using System.Collections.ObjectModel;
  30. using System.ComponentModel;
  31. using System.Text;
  32. #endregion
  33. namespace Interlace.Collections
  34. {
  35. /// <summary>
  36. /// A binding list that guarantees a call to an event any time an item is added and removed from a list.
  37. /// </summary>
  38. /// <typeparam name="T">The type of item in the list.</typeparam>
  39. /// <remarks>The guarantee is based on the reflected source code; in the current version of the framework,
  40. /// nothing other than the overridable methods of Collection&lt;T&gt; modifies the list.</remarks>
  41. public class TrackedCollection<T> : Collection<T>
  42. {
  43. public event EventHandler<TrackedCollectionEventArgs<T>> Added;
  44. public event EventHandler<TrackedCollectionEventArgs<T>> Removed;
  45. protected override void ClearItems()
  46. {
  47. foreach (T item in Items)
  48. {
  49. if (Removed != null) Removed(this, new TrackedCollectionEventArgs<T>(item));
  50. }
  51. base.ClearItems();
  52. }
  53. protected override void InsertItem(int index, T item)
  54. {
  55. base.InsertItem(index, item);
  56. if (Added != null) Added(this, new TrackedCollectionEventArgs<T>(item));
  57. }
  58. protected override void RemoveItem(int index)
  59. {
  60. if (Removed != null) Removed(this, new TrackedCollectionEventArgs<T>(Items[index]));
  61. base.RemoveItem(index);
  62. }
  63. protected override void SetItem(int index, T item)
  64. {
  65. T existingItem = Items[index];
  66. if (!object.ReferenceEquals(item, existingItem))
  67. {
  68. if (Removed != null) Removed(this, new TrackedCollectionEventArgs<T>(existingItem));
  69. }
  70. base.SetItem(index, item);
  71. if (!object.ReferenceEquals(item, existingItem))
  72. {
  73. if (Added != null) Added(this, new TrackedCollectionEventArgs<T>(item));
  74. }
  75. }
  76. }
  77. }