public void WeakEventManager_AddWeakEventListener_Property_FiresEvent()
{
const string propertyName = "TestProperty";
var source = new Mock <INotifyPropertyChanged>();
var invocations = 0;
var wem = new WeakEventManager();
wem.AddWeakEventListener(
source.Object,
(s, a) =>
{
s.ShouldBe(source.Object);
a.PropertyName.ShouldBe(propertyName);
invocations++;
}
);
source.Raise(x => x.PropertyChanged += null, new PropertyChangedEventArgs(propertyName));
invocations.ShouldBe(1);
}
public void WeakEventManager_AddWeakEventListener_Collection_FiresEvent()
{
var collectionAddObject = new object();
var source = new Mock <INotifyCollectionChanged>();
var invocations = 0;
var wem = new WeakEventManager();
wem.AddWeakEventListener(
source.Object,
(s, a) =>
{
s.ShouldBe(source.Object);
a.Action.ShouldBe(NotifyCollectionChangedAction.Add);
a.NewItems.Count.ShouldBe(1);
a.NewItems[0].ShouldBe(collectionAddObject);
invocations++;
}
);
source.Raise(
x => x.CollectionChanged += null,
new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, collectionAddObject)
);
invocations.ShouldBe(1);
}
public void WeakEventManager_AddWeakEventListener_FiresEventAfterGC()
{
var source = new Mock <INotifyPropertyChanged>();
var invocations = 0;
var wem = new WeakEventManager();
wem.AddWeakEventListener <INotifyPropertyChanged, PropertyChangedEventArgs>(
source.Object,
nameof(INotifyPropertyChanged.PropertyChanged),
(s, a) =>
{
s.ShouldBe(source.Object);
invocations++;
}
);
GC.Collect();
source.Raise(x => x.PropertyChanged += null, new PropertyChangedEventArgs("Foo"));
invocations.ShouldBe(1);
}
public void WeakEventManager_ClearWeakEventListeners_EventNoLongerFires()
{
var source = new Mock <INotifyPropertyChanged>();
var invocations = 0;
var wem = new WeakEventManager();
wem.AddWeakEventListener <INotifyPropertyChanged, PropertyChangedEventArgs>(
source.Object,
nameof(INotifyPropertyChanged.PropertyChanged),
(s, a) =>
{
s.ShouldBe(source.Object);
invocations++;
}
);
wem.ClearWeakEventListeners();
source.Raise(x => x.PropertyChanged += null, new PropertyChangedEventArgs("Foo"));
invocations.ShouldBe(0);
}
public TestSubscriber(TestPublisher publisher)
{
Publisher = publisher;
_manager.AddWeakEventListener <TestPublisher, TestEventArgs>(publisher, nameof(publisher.TheEvent), OnTheEvent);
}