private void WireInterceptor(IBindableCollection <TElement> source)
{
_source = source;
_source.CollectionChanged += _weakHandler.Handler;
_propertyChangeObserver = new PropertyChangeObserver(Element_PropertyChanged);
_addActioner = new ElementActioner <TElement>(_source, element => _propertyChangeObserver.Attach(element), element => _propertyChangeObserver.Detach(element), Dispatcher);
}
public void can_clear_the_observed_changed()
{
var observable = new Observable();
var observer = new PropertyChangeObserver<Observable>(observable);
observable.OnPropertyChanged("Property");
observer.ClearChanges();
Assert.False(observer.HasChanged(x => x.Property));
}
public void can_determine_if_a_property_has_changed()
{
var observable = new Observable();
var observer = new PropertyChangeObserver<Observable>(observable);
Assert.False(observer.HasChanged("Property"));
Assert.False(observer.HasChanged(x => x.Property));
observable.OnPropertyChanged("Property");
Assert.True(observer.HasChanged("Property"));
Assert.True(observer.HasChanged(x => x.Property));
}
public void can_get_the_number_of_times_a_property_has_changed()
{
var observable = new Observable();
var observer = new PropertyChangeObserver<Observable>(observable);
Assert.Equal(0, observer.GetChangeCount("Property"));
Assert.Equal(0, observer.GetChangeCount(x => x.Property));
observable.OnPropertyChanged("Property");
Assert.Equal(1, observer.GetChangeCount("Property"));
Assert.Equal(1, observer.GetChangeCount(x => x.Property));
observable.OnPropertyChanged("Property");
Assert.Equal(2, observer.GetChangeCount("Property"));
Assert.Equal(2, observer.GetChangeCount(x => x.Property));
}