public void BeginEndBulkOperationTest()
{
CollectionChangedEventArgs args = null;
var collection = new BulkObservableCollection <int>();
collection.CollectionChanged += (sender, e) => args = e;
collection.BeginBatch();
collection.Add(1);
Assert.IsNull(args);
collection.Add(2);
Assert.IsNull(args);
collection.EndBatch();
Assert.IsNotNull(args);
args = null;
collection.BeginBatch();
collection.AddRange(new[] { 1, 2, 3 });
Assert.IsNull(args);
collection.Add(4);
Assert.IsNull(args);
collection.Remove(4);
Assert.IsNull(args);
collection.Insert(0, 5);
Assert.IsNull(args);
collection.Move(0, 1);
Assert.IsNull(args);
collection.RemoveAt(0);
Assert.IsNull(args);
collection.Clear();
Assert.IsNull(args);
collection.EndBatch();
Assert.IsNotNull(args);
}
public void OperationCollapseTest()
{
var argsList = new List <CollectionChangedEventArgs>();
var collection = new BulkObservableCollection <int>();
collection.CollectionChanged += (sender, e) => argsList.Add(e);
collection.BeginBatch();
collection.Add(1); // \
collection.Add(2); // > collapse into 1 add
collection.Add(3); // /
collection.Remove(1); // \
collection.Remove(2); // > collapse into 1 remove
collection.Remove(3); // /
collection.AddRange(new[] { 1, 2, 3 }); // \
collection.Add(4); // > collapse into 1 add
collection.AddRange(new[] { 5, 6, 7 }); // /
collection.Remove(7); // \
collection.Remove(6); // > collapse into 1 clear
collection.Clear(); // /
collection.Add(1); // \
collection.Add(2); // > collapse into 1 add
collection.Add(3); // /
collection[0] = 1337; // no collapse
collection.Remove(1337); // no collapse
collection.Move(0, 1); // no collapse
collection.Clear(); // no collapse
Assert.AreEqual(0, argsList.Count);
collection.EndBatch();
Assert.AreEqual(9, argsList.Count);
Assert.AreEqual(NotifyCollectionChangedAction.Add, argsList[0].Action);
CollectionAssert.AreEqual(new[] { 1, 2, 3 }, argsList[0].NewItems);
Assert.AreEqual(NotifyCollectionChangedAction.Remove, argsList[1].Action);
CollectionAssert.AreEqual(new[] { 1, 2, 3 }, argsList[1].OldItems);
Assert.AreEqual(NotifyCollectionChangedAction.Add, argsList[2].Action);
CollectionAssert.AreEqual(new[] { 1, 2, 3, 4, 5, 6, 7 }, argsList[2].NewItems);
Assert.AreEqual(NotifyCollectionChangedAction.Reset, argsList[3].Action);
Assert.AreEqual(NotifyCollectionChangedAction.Add, argsList[4].Action);
CollectionAssert.AreEqual(new[] { 1, 2, 3 }, argsList[4].NewItems);
Assert.AreEqual(NotifyCollectionChangedAction.Replace, argsList[5].Action);
Assert.AreEqual(NotifyCollectionChangedAction.Remove, argsList[6].Action);
Assert.AreEqual(NotifyCollectionChangedAction.Move, argsList[7].Action);
Assert.AreEqual(NotifyCollectionChangedAction.Reset, argsList[8].Action);
}