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1 using System;
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2 using System.ComponentModel;
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3 using Castle.DynamicProxy;
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4
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5 namespace BLToolkit.Mapping
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6 {
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7 public static class DataBindingFactory
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8 {
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9 private static readonly ProxyGenerator ProxyGenerator = new ProxyGenerator();
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10
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11 public static T Create<T>()
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12 {
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13 return (T) Create(typeof (T));
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14 }
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15
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16 public static object Create(Type type)
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17 {
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18 return ProxyGenerator.CreateClassProxy(type, new[]
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19 {
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20 typeof (INotifyPropertyChanged),
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21 typeof (IMarkerInterface)
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22 }, new NotifyPropertyChangedInterceptor(type.FullName));
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23 }
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24
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25 public interface IMarkerInterface
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26 {
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27 string TypeName { get; }
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28 }
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29
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30 public class NotifyPropertyChangedInterceptor : IInterceptor
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31 {
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32 private readonly string typeName;
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33 private PropertyChangedEventHandler subscribers = delegate { };
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34
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35 public NotifyPropertyChangedInterceptor(string typeName)
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36 {
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37 this.typeName = typeName;
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38 }
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39
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40 public void Intercept(IInvocation invocation)
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41 {
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42 if (invocation.Method.DeclaringType == typeof (IMarkerInterface))
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43 {
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44 invocation.ReturnValue = typeName;
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45 return;
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46 }
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47 if (invocation.Method.DeclaringType == typeof (INotifyPropertyChanged))
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48 {
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49 var propertyChangedEventHandler = (PropertyChangedEventHandler) invocation.Arguments[0];
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50 if (invocation.Method.Name.StartsWith("add_"))
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51 {
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52 subscribers += propertyChangedEventHandler;
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53 }
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54 else
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55 {
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56 subscribers -= propertyChangedEventHandler;
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57 }
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58 return;
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59 }
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60 invocation.Proceed();
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61 if (invocation.Method.Name.StartsWith("set_"))
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62 {
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63 var propertyName = invocation.Method.Name.Substring(4);
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64 subscribers(invocation.InvocationTarget, new PropertyChangedEventArgs(propertyName));
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65 }
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66 }
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67 }
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68 }
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69 } |
