private bool GetIsFadeAnimationEnabled(ItemsControl itemsControl)
{
if (itemsControl.ItemsSource is ICollectionView)
{
return(((ICollectionView)itemsControl.ItemsSource).SourceCollection == this &&
CrossThreadCollectionWrapper.GetEnableItemFadeAnimations(itemsControl));
}
else
{
return(itemsControl.ItemsSource == this &&
CrossThreadCollectionWrapper.GetEnableItemFadeAnimations(itemsControl));
}
}
private void NotifyCollectionChanged(NotifyCollectionChangedEventArgs e)
{
if (e.NewItems != null && e.NewItems.Count > 1 ||
e.OldItems != null && e.OldItems.Count > 1)
{
throw new InvalidOperationException("Collection Wrapper extension currently supports no batch add/remove/move");
}
switch (e.Action)
{
case NotifyCollectionChangedAction.Add:
if (e.NewStartingIndex == this.internalCollection.Count)
{
this.internalCollection.Add(e.NewItems[0]);
}
else
{
this.internalCollection.Insert(e.NewStartingIndex, e.NewItems[0]);
}
foreach (ItemsControl ItemsControl in CollectionWrapper.RegisteredControls.Where(this.GetIsFadeAnimationEnabled))
{
UIElement Element = ItemsControl.ItemContainerGenerator.ContainerFromItem(e.NewItems[0]) as UIElement;
if (Element != null)
{
Storyboard Storyboard = CrossThreadCollectionWrapper.GetFadeInAnimation(Element);
if (Storyboard != null)
{
Storyboard MyStoryboard = Storyboard.Clone();
MyStoryboard.Freeze();
MyStoryboard.Begin((FrameworkElement)Element);
}
}
}
break;
case NotifyCollectionChangedAction.Remove:
Dictionary <UIElement, Storyboard> Animations = new Dictionary <UIElement, Storyboard>();
object Item = e.OldItems[0];
foreach (ItemsControl ItemsControl in CollectionWrapper.RegisteredControls.Where(this.GetIsFadeAnimationEnabled))
{
UIElement Element = ItemsControl.ItemContainerGenerator.ContainerFromItem(Item) as UIElement;
if (Element != null)
{
Storyboard Storyboard = CrossThreadCollectionWrapper.GetFadeOutAnimation(Element);
if (Storyboard != null)
{
Storyboard MyStoryboard = Storyboard.Clone();
MyStoryboard.Completed += delegate
{
Animations.Remove(Element);
if (Animations.Count == 0)
{
this.internalCollection.Remove(Item);
}
};
MyStoryboard.Freeze();
Animations.Add(Element, MyStoryboard);
}
}
}
if (Animations.Count > 0)
{
Animations.ForEach(_ => _.Value.Begin((FrameworkElement)_.Key));
}
else
{
this.internalCollection.Remove(e.OldItems[0]);
}
break;
case NotifyCollectionChangedAction.Replace:
throw new InvalidOperationException("Collection Wrapper extension currently supports no replace");
case NotifyCollectionChangedAction.Move:
this.internalCollection.Move(e.OldStartingIndex, e.NewStartingIndex);
break;
case NotifyCollectionChangedAction.Reset:
this.internalCollection.Clear();
this.originalCollection.ForEach(item => this.internalCollection.Add(item));
break;
default:
throw new ArgumentOutOfRangeException();
}
}