public void Move_OneItem_ItemIsMovedToNewIndex()
{
var collectionChangedEventArgsList = new List <NotifyCollectionChangedEventArgs>();
var collection = new ExtendedObservableCollection <int> {
123, 456, 789
};
collection.CollectionChanged += (_, args) => collectionChangedEventArgsList.Add(args);
collection.Move(1, 2);
Assert.Equal(new[] { 123, 789, 456 }, collection);
Assert.Single(collectionChangedEventArgsList);
Assert.Equal(NotifyCollectionChangedAction.Move, collectionChangedEventArgsList[0].Action);
Assert.NotNull(collectionChangedEventArgsList[0].NewItems);
Assert.Single(collectionChangedEventArgsList[0].NewItems);
Assert.Equal(456, collectionChangedEventArgsList[0].NewItems[0]);
Assert.NotNull(collectionChangedEventArgsList[0].OldItems);
Assert.Single(collectionChangedEventArgsList[0].OldItems);
Assert.Equal(456, collectionChangedEventArgsList[0].OldItems[0]);
Assert.Equal(1, collectionChangedEventArgsList[0].OldStartingIndex);
Assert.Equal(2, collectionChangedEventArgsList[0].NewStartingIndex);
}
public void Move_TwoItems_ItemsAreMovedToNewIndex()
{
var collectionChangedEventArgsList = new List <NotifyCollectionChangedEventArgs>();
var collection = new ExtendedObservableCollection <int> {
123, 456, 789, 135, 246
};
collection.CollectionChanged += (_, args) => collectionChangedEventArgsList.Add(args);
collection.Move(1, 2);
collection.Move(4, 0);
Assert.Equal(new[] { 246, 123, 789, 456, 135 }, collection);
Assert.Equal(2, collectionChangedEventArgsList.Count);
Assert.Equal(NotifyCollectionChangedAction.Move, collectionChangedEventArgsList[0].Action);
Assert.NotNull(collectionChangedEventArgsList[0].NewItems);
Assert.Single(collectionChangedEventArgsList[0].NewItems);
Assert.Equal(456, collectionChangedEventArgsList[0].NewItems[0]);
Assert.NotNull(collectionChangedEventArgsList[0].OldItems);
Assert.Single(collectionChangedEventArgsList[0].OldItems);
Assert.Equal(456, collectionChangedEventArgsList[0].OldItems[0]);
Assert.Equal(1, collectionChangedEventArgsList[0].OldStartingIndex);
Assert.Equal(2, collectionChangedEventArgsList[0].NewStartingIndex);
Assert.Equal(NotifyCollectionChangedAction.Move, collectionChangedEventArgsList[1].Action);
Assert.NotNull(collectionChangedEventArgsList[1].NewItems);
Assert.Single(collectionChangedEventArgsList[1].NewItems);
Assert.Equal(246, collectionChangedEventArgsList[1].NewItems[0]);
Assert.NotNull(collectionChangedEventArgsList[1].OldItems);
Assert.Single(collectionChangedEventArgsList[1].OldItems);
Assert.Equal(246, collectionChangedEventArgsList[1].OldItems[0]);
Assert.Equal(4, collectionChangedEventArgsList[1].OldStartingIndex);
Assert.Equal(0, collectionChangedEventArgsList[1].NewStartingIndex);
}
public static void Main(string[] args)
{
var collection = new ExtendedObservableCollection <string>();
collection.CollectionChanged += Collection_CollectionChanged;
collection.Add("item1");
collection.AddRange(new string[] { "item2", "item3", "item4" });
collection[0] = "item1 mk2";
collection.Move(0, 3);
collection.Remove("item3");
collection.Clear();
}
public static void Sort <T>(this ExtendedObservableCollection <T> collection) where T : IComparable <T>
{
if (collection == null)
{
throw new ArgumentNullException("collection");
}
for (var startIndex = 0; startIndex < collection.Count - 1; startIndex += 1)
{
var indexOfSmallestItem = startIndex;
for (var i = startIndex + 1; i < collection.Count; i += 1)
{
if (collection[i].CompareTo(collection[indexOfSmallestItem]) < 0)
{
indexOfSmallestItem = i;
}
}
if (indexOfSmallestItem != startIndex)
{
collection.Move(indexOfSmallestItem, startIndex);
}
}
}