public void RaisesCollectionChangedWithAddAndRemoveWhenFilteredCollectionChanges()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => x.IsActive);
bool addedToCollection = false;
bool removedFromCollection = false;
viewsCollection.CollectionChanged += (s, e) =>
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
addedToCollection = true;
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
removedFromCollection = true;
}
};
var filteredInObject = new ItemMetadata(new object()) {IsActive = true};
originalCollection.Add(filteredInObject);
Assert.IsTrue(addedToCollection);
Assert.IsFalse(removedFromCollection);
originalCollection.Remove(filteredInObject);
Assert.IsTrue(removedFromCollection);
}
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 RaisesCollectionChangedWhenFilteredCollectionChanges()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => x.IsActive);
bool collectionChanged = false;
viewsCollection.CollectionChanged += (s, e) => collectionChanged = true;
originalCollection.Add(new ItemMetadata(new object()) {IsActive = true});
Assert.IsTrue(collectionChanged);
}
public void CanWrapCollectionCollection()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => true);
Assert.AreEqual(0, viewsCollection.Count());
var item = new object();
originalCollection.Add(new ItemMetadata(item));
Assert.AreEqual(1, viewsCollection.Count());
Assert.AreSame(item, viewsCollection.First());
}
public void CanFilterCollection()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => x.Name == "Possible");
originalCollection.Add(new ItemMetadata(new object()));
Assert.AreEqual(0, viewsCollection.Count());
var item = new object();
originalCollection.Add(new ItemMetadata(item) {Name = "Possible"});
Assert.AreEqual(1, viewsCollection.Count());
Assert.AreSame(item, viewsCollection.First());
}
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 ChangingMetadataOnItemAddsOrRemovesItFromTheFilteredCollection()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => x.IsActive);
bool addedToCollection = false;
bool removedFromCollection = false;
viewsCollection.CollectionChanged += (s, e) =>
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
addedToCollection = true;
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
removedFromCollection = true;
}
};
originalCollection.Add(new ItemMetadata(new object()) {IsActive = true});
Assert.IsTrue(addedToCollection);
Assert.IsFalse(removedFromCollection);
addedToCollection = false;
originalCollection[0].IsActive = false;
Assert.AreEqual(0, viewsCollection.Count());
Assert.IsTrue(removedFromCollection);
Assert.IsFalse(addedToCollection);
Assert.AreEqual(0, viewsCollection.Count());
addedToCollection = false;
removedFromCollection = false;
originalCollection[0].IsActive = true;
Assert.AreEqual(1, viewsCollection.Count());
Assert.IsTrue(addedToCollection);
Assert.IsFalse(removedFromCollection);
}
public void ViewsCollectionSortedAfterAddingItemToOriginalCollection()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
ViewsCollection viewsCollection = new ViewsCollection(originalCollection, (i) => true);
viewsCollection.SortComparison = Region.DefaultSortComparison;
var view1 = new MockSortableView1();
var view2 = new MockSortableView2();
var view3 = new MockSortableView3();
originalCollection.Add(new ItemMetadata(view2));
originalCollection.Add(new ItemMetadata(view3));
originalCollection.Add(new ItemMetadata(view1));
Assert.AreSame(view1, viewsCollection.ElementAt(0));
Assert.AreSame(view2, viewsCollection.ElementAt(1));
Assert.AreSame(view3, viewsCollection.ElementAt(2));
}
public void RemovingFromFilteredCollectionDoesNotThrow()
{
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);
CollectionViewSource cvs = new CollectionViewSource {Source = viewsCollection};
var view = cvs.View;
try
{
originalCollection.RemoveAt(1);
}
catch (Exception ex)
{
Assert.Fail(ex.Message);
}
}
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 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 EnumeratesWrappedItems()
{
var originalCollection = new ObservableCollection<ItemMetadata>()
{
new ItemMetadata(new object()),
new ItemMetadata(new object())
};
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => true);
Assert.AreEqual(2, viewsCollection.Count());
Assert.AreSame(originalCollection[0].Item, viewsCollection.ElementAt(0));
Assert.AreSame(originalCollection[1].Item, viewsCollection.ElementAt(1));
}
public void DoesNotRaiseCollectionChangedWhenAddingOrRemovingFilteredOutObject()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => x.IsActive);
bool collectionChanged = false;
viewsCollection.CollectionChanged += (s, e) => collectionChanged = true;
var filteredOutObject = new ItemMetadata(new object()) {IsActive = false};
originalCollection.Add(filteredOutObject);
originalCollection.Remove(filteredOutObject);
Assert.IsFalse(collectionChanged);
}
public void CollectionChangedPassesWrappedItemInArgumentsWhenRemoving()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => true);
IList newItemsPassed = null;
viewsCollection.CollectionChanged += (s, e) => { newItemsPassed = e.NewItems; };
var filteredInObject = new ItemMetadata(new object());
originalCollection.Add(filteredInObject);
Assert.IsNotNull(newItemsPassed);
Assert.AreEqual(1, newItemsPassed.Count);
Assert.AreSame(filteredInObject.Item, newItemsPassed[0]);
}
public void ChangingSortComparisonCausesResortingOfCollection()
{
var originalCollection = new ObservableCollection<ItemMetadata>();
ViewsCollection viewsCollection = new ViewsCollection(originalCollection, (i) => true);
var view1 = new MockSortableView1();
var view2 = new MockSortableView2();
var view3 = new MockSortableView3();
originalCollection.Add(new ItemMetadata(view2));
originalCollection.Add(new ItemMetadata(view3));
originalCollection.Add(new ItemMetadata(view1));
// ensure items are in original order
Assert.AreSame(view2, viewsCollection.ElementAt(0));
Assert.AreSame(view3, viewsCollection.ElementAt(1));
Assert.AreSame(view1, viewsCollection.ElementAt(2));
// change sort comparison
viewsCollection.SortComparison = Region.DefaultSortComparison;
// ensure items are properly sorted
Assert.AreSame(view1, viewsCollection.ElementAt(0));
Assert.AreSame(view2, viewsCollection.ElementAt(1));
Assert.AreSame(view3, viewsCollection.ElementAt(2));
}