/// <summary>
/// Attaches the specified source.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="subscription">The subscription.</param>
/// <param name="unsubscription">The unsubscription.</param>
public void Attach(object source, Action <EventHandler> subscription, Action <EventHandler> unsubscription)
{
if (_weakEventListenersDict.ContainsKey(source)) // not design for (note we could tweak the code to manage a list of WeakEventListener by source if needed)
{
_weakEventListenersDict[source].Detach();
Debug.Assert(false, "Listening twice a source");
}
var target = (TInstance)_weakInstance.Target;
if (null != target)
{
var weakEventListener = new WeakEventListener <TInstance, object, EventArgs>(target)
{
OnEventAction = OnEventAction,
OnDetachAction = wel => unsubscription(wel.OnEvent)
};
subscription(weakEventListener.OnEvent);
_weakEventListenersDict[source] = weakEventListener;
}
else
{
Debug.Assert(false, "A disposed instance tries to listen");
}
}
public void Detach(object source)
{
WeakEventListener <TInstance, object, EventArgs> weakEventListener = _weakEventListenersDict[source];
if (weakEventListener != null)
{
weakEventListener.Detach();
_weakEventListenersDict.Remove(source);
}
else
{
Debug.Assert(false, "Trying to detach inexisting WeakEventListener");
}
}