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  1.     public abstract class LivetWeakEventListener : IDisposable
  2.     {
  3.         public abstract void Dispose();
  4.     }
  5.  
  6.     public class LivetWeakEventListener<TDelegate, TEventArgs> : LivetWeakEventListener where TEventArgs : EventArgs
  7.     {
  8.         private bool _disposed = false;
  9.  
  10.         private EventHandler<TEventArgs> _handler;
  11.         private TDelegate _resultHandler;
  12.         private Action<TDelegate> _remove;
  13.  
  14.         private static void ReceiveEvent(WeakReference listenerWeakReference, object sender, TEventArgs args)
  15.         {
  16.             var listener = listenerWeakReference.Target as LivetWeakEventListener<TDelegate, TEventArgs>;
  17.  
  18.             if (listener != null)
  19.             {
  20.                 var handler = listener._handler;
  21.  
  22.                 if (handler != null)
  23.                 {
  24.                     handler(sender, args);
  25.                 }
  26.             }
  27.         }
  28.  
  29.         private static TDelegate GetStaticHandler(WeakReference listenerWeakReference, Func<EventHandler<TEventArgs>, TDelegate> conversion)
  30.         {
  31.             return conversion((sender, e) => ReceiveEvent(listenerWeakReference, sender, e));
  32.         }
  33.  
  34.         private LivetWeakEventListener() { }
  35.  
  36.         public LivetWeakEventListener(Func<EventHandler<TEventArgs>, TDelegate> conversion, Action<TDelegate> add, Action<TDelegate> remove, EventHandler<TEventArgs> handler)
  37.         {
  38.             _handler = handler;
  39.             _remove = remove;
  40.  
  41.             _resultHandler = GetStaticHandler(new WeakReference(this), conversion);
  42.  
  43.             add(_resultHandler);
  44.         }
  45.  
  46.         public override void Dispose()
  47.         {
  48.             GC.SuppressFinalize(this);
  49.             this.Dispose(true);
  50.         }
  51.  
  52.         private void Dispose(bool disposing)
  53.         {
  54.             if (_disposed) return;
  55.             _disposed = true;
  56.             _remove(_resultHandler);
  57.         }
  58.  
  59.         ~LivetWeakEventListener()
  60.         {
  61.             Dispose(false);
  62.         }
  63.     }
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https://ideone.com/2nW6j
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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