public void EventHandlerShouldBeWeak()
{
bool eventReceived = false;
var listener = new PropertyChangedListener();
WeakEventHandler <PropertyChangedEventHandler, PropertyChangedEventArgs> .Register(
this,
listener,
handler => new PropertyChangedEventHandler(handler),
(s, h) => s.PropertyChanged += h,
(s, h) => s.PropertyChanged -= h,
(l, s, e) => { l.OnEvent(s, e); eventReceived = true; });
RaiseEvent();
Assert.IsTrue(listener.EventReceived);
Assert.IsTrue(eventReceived);
listener.Reset();
eventReceived = false;
listener = null;
GC.Collect();
RaiseEvent();
Assert.IsFalse(eventReceived);
}
public void ShouldThrowIfRemoveHandlerIsNull()
{
var listener = new PropertyChangedListener();
WeakEventHandler <PropertyChangedEventHandler, PropertyChangedEventArgs> .Register(
this,
listener,
handler => new PropertyChangedEventHandler(handler),
(s, h) => s.PropertyChanged += h,
null,
(l, s, e) => l.OnEvent(s, e));
}
public void ShouldThrowIfConversionNull()
{
var listener = new PropertyChangedListener();
WeakEventHandler <PropertyChangedEventHandler, PropertyChangedEventArgs> .Register(
this,
listener,
null,
(s, h) => s.PropertyChanged += h,
(s, h) => s.PropertyChanged -= h,
(l, s, e) => l.OnEvent(s, e));
}
public void ShouldThrowIfSenderIsNull()
{
var listener = new PropertyChangedListener();
WeakEventHandler <PropertyChangedEventHandler, PropertyChangedEventArgs> .Register <WeakEventHandlerCustomTest, PropertyChangedListener>(
null,
listener,
handler => new PropertyChangedEventHandler(handler),
(s, h) => s.PropertyChanged += h,
(s, h) => s.PropertyChanged -= h,
(l, s, e) => l.OnEvent(s, e));
}
public void ShouldThrowIfForwardEventIsNull()
{
var listener = new PropertyChangedListener();
WeakEventHandler <PropertyChangedEventHandler, PropertyChangedEventArgs> .Register(
this,
listener,
handler => new PropertyChangedEventHandler(handler),
(s, h) => s.PropertyChanged += h,
(s, h) => s.PropertyChanged -= h,
null);
}
public void DetachEventHandler()
{
var listener = new PropertyChangedListener();
var subscription = WeakEventHandler <PropertyChangedEventHandler, PropertyChangedEventArgs> .Register(
this,
listener,
handler => new PropertyChangedEventHandler(handler),
(s, h) => s.PropertyChanged += h,
(s, h) => s.PropertyChanged -= h,
(l, s, e) => l.OnEvent(s, e));
subscription.Dispose();
RaiseEvent();
Assert.IsFalse(listener.EventReceived);
}
public void HandleEvent()
{
var listener = new PropertyChangedListener();
WeakEventHandler <PropertyChangedEventHandler, PropertyChangedEventArgs> .Register(
this,
listener,
handler => new PropertyChangedEventHandler(handler),
(s, h) => s.PropertyChanged += h,
(s, h) => s.PropertyChanged -= h,
(l, s, e) => l.OnEvent(s, e));
RaiseEvent();
Assert.IsTrue(listener.EventReceived);
}
