public void AddingToOriginalCollectionFiresResetNotificationIfSortComparisonSet()
{
// Reset is fired to support the need to resort after updating the collection
var originalCollection = new ObservableCollection<ItemMetadata>();
var viewsCollection = new ViewsCollection(originalCollection, (i) => true);
viewsCollection.SortComparison = (a, b) => { return 0; };
var eventTracker = new CollectionChangedTracker(viewsCollection);
originalCollection.Add(new ItemMetadata(new object()));
Assert.IsTrue(eventTracker.ActionsFired.Contains(NotifyCollectionChangedAction.Add));
Assert.AreEqual(
1,
eventTracker.ActionsFired.Count(a => a == NotifyCollectionChangedAction.Reset));
}
public void AddingToOriginalCollectionFiresAddCollectionChangeEvent()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, (i) => true);
var eventTracker = new CollectionChangedTracker(viewsCollection);
originalCollection.Add(new ItemMetadata(new object()));
Assert.IsTrue(eventTracker.ActionsFired.Contains(NotifyCollectionChangedAction.Add));
}
public void OnAddNotifyCollectionChangedThenIndexProvided()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, (i) => true);
var eventTracker = new CollectionChangedTracker(viewsCollection);
originalCollection.Add(new ItemMetadata("a"));
var addEvent = eventTracker.NotifyEvents.Single(e => e.Action == NotifyCollectionChangedAction.Add);
Assert.AreEqual(0, addEvent.NewStartingIndex);
}
public void OnRemoveOfFilterMatchingItemThenViewCollectionRelativeIndexProvided()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
originalCollection.Add(new ItemMetadata("a"));
originalCollection.Add(new ItemMetadata("b"));
originalCollection.Add(new ItemMetadata("c"));
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, (i) => !"b".Equals(i.Item));
var eventTracker = new CollectionChangedTracker(viewsCollection);
originalCollection.RemoveAt(2);
var removeEvent = eventTracker.NotifyEvents.Single(e => e.Action == NotifyCollectionChangedAction.Remove);
Assert.IsNotNull(removeEvent);
Assert.AreEqual(1, removeEvent.OldStartingIndex);
}
public async Task OnRemoveNotifyCollectionChangedThenIndexProvided()
{
await ExecuteOnUIThread(() =>
{
var originalCollection = new ObservableCollection<ItemMetadata>();
originalCollection.Add(new ItemMetadata("a"));
originalCollection.Add(new ItemMetadata("b"));
originalCollection.Add(new ItemMetadata("c"));
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, (i) => true);
var eventTracker = new CollectionChangedTracker(viewsCollection);
originalCollection.RemoveAt(1);
var removeEvent = eventTracker.NotifyEvents.Single(e => e.Action == NotifyCollectionChangedAction.Remove);
Assert.IsNotNull(removeEvent);
Assert.AreEqual(1, removeEvent.OldStartingIndex);
});
}