/// <summary>
/// Unregisters a message recipient for a given type of messages, for
/// a given action and a given token. Other message types will still be transmitted to the
/// recipient (if it registered for them previously). Other actions that have
/// been registered for the message type TMessage, for the given recipient and other tokens (if
/// available) will also remain available.
/// </summary>
/// <typeparam name="TMessage">The type of messages that the recipient wants
/// to unregister from.</typeparam>
/// <param name="recipient">The recipient that must be unregistered.</param>
/// <param name="token">The token for which the recipient must be unregistered.</param>
/// <param name="action">The action that must be unregistered for
/// the recipient and for the message type TMessage.</param>
public virtual void Unregister <TMessage>(object recipient, object token, Action <TMessage> action)
{
Messager.UnregisterFromLists <TMessage>(recipient, token, action, this._recipientsStrictAction);
Messager.UnregisterFromLists <TMessage>(recipient, token, action, this._recipientsOfSubclassesAction);
this.Cleanup();
}
private void Cleanup()
{
Messager.CleanupList(this._recipientsOfSubclassesAction);
Messager.CleanupList(this._recipientsStrictAction);
}
/// <summary>
/// Unregisters a messager recipient completely. After this method
/// is executed, the recipient will not receive any messages anymore.
/// </summary>
/// <param name="recipient">The recipient that must be unregistered.</param>
public virtual void Unregister(object recipient)
{
Messager.UnregisterFromLists(recipient, this._recipientsOfSubclassesAction);
Messager.UnregisterFromLists(recipient, this._recipientsStrictAction);
}
private static void SendToList <TMessage>(TMessage message, IEnumerable <Messager.WeakActionAndToken> list, Type messageTargetType, object token)
{
bool flag;
if (list != null)
{
List <Messager.WeakActionAndToken> weakActionAndTokens = list.Take <Messager.WeakActionAndToken>(list.Count <Messager.WeakActionAndToken>()).ToList <Messager.WeakActionAndToken>();
foreach (Messager.WeakActionAndToken weakActionAndToken in weakActionAndTokens)
{
IExecuteWithObject action = weakActionAndToken.Action as IExecuteWithObject;
if (action == null || !weakActionAndToken.Action.IsAlive || weakActionAndToken.Action.Target == null || !(messageTargetType == null) && !(weakActionAndToken.Action.Target.GetType() == messageTargetType) && !Messager.Implements(weakActionAndToken.Action.Target.GetType(), messageTargetType))
{
flag = false;
}
else if (weakActionAndToken.Token != null || token != null)
{
flag = (weakActionAndToken.Token == null ? false : weakActionAndToken.Token.Equals(token));
}
else
{
flag = true;
}
if (flag)
{
action.ExecuteWithObject(message);
}
}
}
}
/// <summary>
/// Sets the Messenger's default (static) instance to null.
/// </summary>
public static void Reset()
{
Messager._defaultInstance = null;
}
/// <summary>
/// Provides a way to override the Messenger.Default instance with
/// a custom instance, for example for unit testing purposes.
/// </summary>
/// <param name="newMessenger">The instance that will be used as Messenger.Default.</param>
public static void OverrideDefault(Messager newMessenger)
{
Messager._defaultInstance = newMessenger;
}
