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/source/library/Interlace/Binding/Views/PropertyView.cs

https://bitbucket.org/VahidN/interlace
C# | 140 lines | 92 code | 22 blank | 26 comment | 11 complexity | 8ff4b74de1dc3d77c18ef01c1137dbe8 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.Text;
  30. using System.Reflection;
  31. #endregion
  32. namespace Interlace.Binding.Views
  33. {
  34. public class PropertyView : BinderViewBase
  35. {
  36. object _boundObject;
  37. string _propertyName;
  38. object _unboundValue;
  39. bool _ignoreChangedEvent;
  40. public PropertyView(object boundObject, string propertyName, object unboundValue)
  41. : this(boundObject, propertyName, unboundValue, false)
  42. {
  43. }
  44. public PropertyView(object boundObject, string propertyName, object unboundValue, bool readOnly)
  45. {
  46. _boundObject = boundObject;
  47. _propertyName = propertyName;
  48. _unboundValue = unboundValue;
  49. ViewToModelDisabled = readOnly;
  50. // Hook the property change event, if it exists on the object:
  51. EventInfo changeEvent = _boundObject.GetType().GetEvent(_propertyName + "Changed");
  52. if (changeEvent != null)
  53. {
  54. changeEvent.AddEventHandler(_boundObject, GetChangedEventHandler());
  55. }
  56. }
  57. protected virtual Delegate GetChangedEventHandler()
  58. {
  59. return new EventHandler(ChangedEventHandler);
  60. }
  61. protected void ChangedEventHandler(object sender, EventArgs e)
  62. {
  63. if (_ignoreChangedEvent) return;
  64. ChangeModel(GetProperty());
  65. }
  66. private void SetEditValueAndIgnoreEvents(object value)
  67. {
  68. try
  69. {
  70. _ignoreChangedEvent = true;
  71. SetProperty(value);
  72. }
  73. finally
  74. {
  75. _ignoreChangedEvent = false;
  76. }
  77. }
  78. protected override void OnModelChanged(object value)
  79. {
  80. if (value == BinderNotBound.Value || value == BinderMissingProperty.Value)
  81. {
  82. SetEditValueAndIgnoreEvents(_unboundValue);
  83. }
  84. else
  85. {
  86. SetEditValueAndIgnoreEvents(value);
  87. }
  88. }
  89. public object GetProperty()
  90. {
  91. PropertyInfo property = _boundObject.GetType().GetProperty(_propertyName);
  92. if (property == null)
  93. {
  94. throw new InvalidOperationException(String.Format(
  95. "The property \"{0}\" does not exist on the bound object.", _propertyName));
  96. }
  97. return property.GetValue(_boundObject, null);
  98. }
  99. public void SetProperty(object value)
  100. {
  101. PropertyInfo property = _boundObject.GetType().GetProperty(_propertyName);
  102. if (property == null)
  103. {
  104. throw new InvalidOperationException(String.Format(
  105. "The property \"{0}\" does not exist on the bound object.", _propertyName));
  106. }
  107. try
  108. {
  109. _ignoreChangedEvent = true;
  110. property.SetValue(_boundObject, value, null);
  111. }
  112. finally
  113. {
  114. _ignoreChangedEvent = false;
  115. }
  116. }
  117. }
  118. }