Tizen.NUI/src/internal/WeakEventHandler.cs

   1 using System;\r
   2 using System.Reflection;\r
   3 \r
   4 namespace Tizen.NUI\r
   5 {\r
   6     internal sealed class WeakEventHandler<TEventArgs> where TEventArgs : EventArgs\r
   7     {\r
   8         private readonly WeakReference _targetReference;\r
   9         private readonly MethodInfo _method;\r
  10 \r
  11         public WeakEventHandler(EventHandler<TEventArgs> callback)\r
  12         {\r
  13             _method = callback.GetMethodInfo();           \r
  14             _targetReference = new WeakReference(callback.Target, true);\r
  15         }\r
  16 \r
  17         public void Handler(object sender, TEventArgs e)\r
  18         {\r
  19             var target = _targetReference.Target;\r
  20             if (target != null)\r
  21             {\r
  22                 var callback = (Action<object, TEventArgs>)_method.CreateDelegate(typeof(Action<object, TEventArgs>), target);\r
  23                 if (callback != null)\r
  24                 {\r
  25                     callback(sender, e);\r
  26                 }\r
  27             }\r
  28         }\r
  29 }\r
  30 \r
  31 }\r
  32 \r