private void OnSourceCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
object[] oldInnerCollection = innerCollection;
innerCollection = TranslateCollection(SourceCollection.Cast <object>(), filterPredicate, sortKeySelector, sortDirection).ToArray();
if (innerCollection.Contains(CurrentItem))
{
SetCurrent(CurrentItem);
}
else
{
SetCurrent(CurrentItemIndex >= oldInnerCollection.Length ? innerCollection.Length : CurrentItemIndex);
}
IEnumerable <object> oldItems = e.OldItems.Intersect(oldInnerCollection).ToArray();
IEnumerable <object> newItems = e.NewItems.Intersect(innerCollection).ToArray();
if (oldItems.Count() > 1 || newItems.Count() > 1)
{
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Reset(oldInnerCollection, innerCollection));
return;
}
object oldItem = e.OldItems.FirstOrDefault();
int oldIndex = Granular.Compatibility.Array.FindIndex(oldInnerCollection, item => Granular.Compatibility.EqualityComparer <object> .Default.Equals(item, oldItem));
object newItem = e.NewItems.FirstOrDefault();
int newIndex = Granular.Compatibility.Array.FindIndex(innerCollection, item => Granular.Compatibility.EqualityComparer <object> .Default.Equals(item, newItem));
if (oldIndex == -1 && newIndex == -1 || oldItem == newItem && oldIndex == newIndex)
{
return;
}
if (Granular.Compatibility.EqualityComparer <object> .Default.Equals(oldItem, newItem))
{
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Move(newItem, oldIndex, newIndex));
}
else if (oldIndex == newIndex)
{
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Replace(oldItem, newItem, newIndex));
}
else
{
if (oldIndex != -1)
{
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Remove(oldItem, oldIndex));
}
if (newIndex != -1)
{
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Add(newItem, newIndex));
}
}
}
/// <summary>
/// Updates the <see cref="IPagedCollectionView.TotalItemCount"/> and
/// <see cref="IPagedCollectionView.ItemCount"/> properties based on the
/// specified <paramref name="totalItemCount"/> and values in the view
/// </summary>
/// <param name="totalItemCount">The total item count</param>
private void UpdateItemCounts(int totalItemCount)
{
int itemCount = totalItemCount;
if (itemCount == -1)
{
// We only want to update the ItemCount when we're on a page with items
int count = SourceCollection.Cast <object>().Count();
if (count > 0)
{
itemCount = Math.Max(ItemCount, (PageIndex * PageSize) + count);
}
}
UpdateItemCounts(totalItemCount, itemCount);
}
private void ResetInnerCollection()
{
object[] oldInnerCollection = innerCollection ?? new object[0];
innerCollection = TranslateCollection(SourceCollection.Cast <object>(), filterPredicate, sortKeySelector, sortDirection).ToArray();
if (innerCollection.Contains(CurrentItem))
{
SetCurrent(CurrentItem);
}
else
{
SetCurrent(CurrentItemIndex >= oldInnerCollection.Length ? innerCollection.Length : CurrentItemIndex);
}
CollectionChanged.Raise(this, NotifyCollectionChangedEventArgs.Reset(oldInnerCollection, innerCollection));
}