public void AddTest()
{
var events = new BindableEvents(new Bindable <int>());
BindableCallback listener1 = ((c, o) => { });
BindableCallback listener2 = ((c, o) => { });
// add two
events.Add(listener1);
events.Add(listener2);
// get the listeners
BindableCallback listeners = (BindableCallback)UnitTestUtil.GetProtected(events, "Listeners");
Assert.AreEqual(listeners.GetInvocationList().Length, 2, "There should be two listeners by now");
events.Remove(listener1); // remove the first one
listeners = (BindableCallback)UnitTestUtil.GetProtected(events, "Listeners");
Assert.AreEqual(listeners.GetInvocationList().Count(), 1, "There should only be one listener left");
events.Remove(listener1); // try to remove it again
listeners = (BindableCallback)UnitTestUtil.GetProtected(events, "Listeners");
Assert.AreEqual(listeners.GetInvocationList().Count(), 1, "There should still be one listener left");
events.Remove(listener2); // remove the other one
listeners = (BindableCallback)UnitTestUtil.GetProtected(events, "Listeners");
Assert.IsNull(listeners, "There should be no listener left");
}
/// <summary>
/// Add a listener.
/// </summary>
/// <param name="listener">The listener</param>
public void Add(BindableCallback listener)
{
// prevent that the same listener is added multiple times
if (Listeners == null || !Listeners.GetInvocationList().Contains(listener))
{
Listeners += listener;
}
}
public void AddingListenerMultipleTimesTest()
{
var events = new BindableEvents(new Bindable <int>());
BindableCallback listener1 = ((c, o) => { });
// add two
events.Add(listener1);
events.Add(listener1);
// get the listeners
BindableCallback listeners = (BindableCallback)UnitTestUtil.GetProtected(events, "Listeners");
Assert.AreEqual(listeners.GetInvocationList().Length, 1, "There should only be listeners registered");
}