public void ReductionBindTriggersHandler()
{
// Arrange
const int expected = 2;
var collection = new ProperObservableCollection <Giraffe>();
collection.BindCollective <Giraffe, int>(nameof(Giraffe.Property), OnCollectivePropertyChanged, Math.Min);
int result = -1;
void OnCollectivePropertyChanged(object sender, PropertyChangedEventArgs e)
{
result = ((PropertyMutatedEventArgs <int>)e).NewValue;
}
// Act
collection.Add(new Giraffe()
{
Property = expected + 1
});
collection.Add(new Giraffe()
{
Property = expected
});
Assert.AreEqual(expected, result);
}
public void PropertyOnCollectionChangedIsPropagated()
{
bool eventHandlerInvoked = false;
var collection = new ProperObservableCollection <Giraffe>();
collection.Bind(nameof(Giraffe.Property), (sender, e) =>
{
eventHandlerInvoked = true;
});
collection.Add(new Giraffe());
Assert.IsFalse(eventHandlerInvoked);
collection[0].Property = 0;
Assert.IsFalse(eventHandlerInvoked);
collection[0].Property2 = 1;
Assert.IsFalse(eventHandlerInvoked);
collection[0].Property = 1;
Assert.IsTrue(eventHandlerInvoked);
}
public void PropertyOnCollectionChangedIsNotPropagatedIfRemoved()
{
//Arrange
bool eventHandlerInvoked = false;
var collection = new ProperObservableCollection <Giraffe>();
collection.Bind(nameof(Giraffe.Property), (sender, e) =>
{
eventHandlerInvoked = true;
});
var giraffe = new Giraffe();
collection.Add(giraffe);
//Act
collection.Remove(giraffe);
giraffe.Property = 1;
//Assert
Assert.IsFalse(eventHandlerInvoked);
}
