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annotate MetroWpf/MetroWpf.Xaml/Events/WeakPropertyChangeNotifier.cs @ 58:241e2f22ed3c

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Latest version
author Steven Hollidge <stevenhollidge@hotmail.com>
date Sat, 21 Apr 2012 15:06:48 +0100
parents 7721a1270363
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17
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1 using System;
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2 using System.ComponentModel;
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3 using System.Windows;
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4 using System.Windows.Data;
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5
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6 namespace MetroWpf.Xaml.Events
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7 {
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8 /// <summary>
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9 /// http://agsmith.wordpress.com/2008/04/07/propertydescriptor-addvaluechanged-alternative/
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10 /// </summary>
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11 public sealed class WeakPropertyChangeNotifier
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12 : DependencyObject, IDisposable
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13 {
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14 #region Member Variables
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15 private readonly WeakReference _propertySource;
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16 #endregion // Member Variables
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17
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18 #region Constructor
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19 public WeakPropertyChangeNotifier(DependencyObject propertySource, string path)
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20 : this(propertySource, new PropertyPath(path))
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21 {
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22 }
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23 public WeakPropertyChangeNotifier(DependencyObject propertySource, DependencyProperty property)
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24 : this(propertySource, new PropertyPath(property))
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25 {
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26 }
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27 public WeakPropertyChangeNotifier(DependencyObject propertySource, PropertyPath property)
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28 {
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29 if (null == propertySource)
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30 throw new ArgumentNullException("propertySource");
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31 if (null == property)
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32 throw new ArgumentNullException("property");
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33
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34 this._propertySource = new WeakReference(propertySource);
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35
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36 var binding = new System.Windows.Data.Binding();
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37 binding.Path = property;
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38 binding.Mode = BindingMode.OneWay;
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39 binding.Source = propertySource;
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40 BindingOperations.SetBinding(this, ValueProperty, binding);
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41 }
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42 #endregion // Constructor
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43
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44 #region PropertySource
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45 public DependencyObject PropertySource
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46 {
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47 get
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48 {
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49 try
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50 {
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51 // note, it is possible that accessing the target property
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52 // will result in an exception so i’ve wrapped this check
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53 // in a try catch
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54 return this._propertySource.IsAlive
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55 ? this._propertySource.Target as DependencyObject
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56 : null;
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57 }
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58 catch
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59 {
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60 return null;
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61 }
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62 }
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63 }
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64 #endregion // PropertySource
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65
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66 #region Value
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67 /// <summary>
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68 /// Identifies the <see cref="Value"/> dependency property
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69 /// </summary>
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70 public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value",
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71 typeof(object), typeof(WeakPropertyChangeNotifier), new FrameworkPropertyMetadata(null, new PropertyChangedCallback(OnPropertyChanged)));
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72
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73 private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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74 {
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75 WeakPropertyChangeNotifier notifier = (WeakPropertyChangeNotifier)d;
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76 if (null != notifier.ValueChanged)
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77 notifier.ValueChanged(notifier, EventArgs.Empty);
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78 }
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79
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80 /// <summary>
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81 /// Returns/sets the value of the property
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82 /// </summary>
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83 /// <seealso cref="ValueProperty"/>
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84 [Description("Returns/sets the value of the property")]
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85 [Category("Behavior")]
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86 [Bindable(true)]
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87 public object Value
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88 {
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89 get
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90 {
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91 return (object)this.GetValue(ValueProperty);
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92 }
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93 set
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94 {
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95 this.SetValue(ValueProperty, value);
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96 }
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97 }
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98 #endregion //Value
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99
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100 #region Events
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101 public event EventHandler ValueChanged;
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102 #endregion // Events
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103
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104 #region IDisposable Members
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105 public void Dispose()
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106 {
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107 BindingOperations.ClearBinding(this, ValueProperty);
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108 }
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109 #endregion
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110 }
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111 }