static void gallery_Drop(object sender, DragEventArgs e)
{
e.Handled = true;
if (dragableItem != null)
{
HitTestResult res = VisualTreeHelper.HitTest((GalleryControl)sender, e.GetPosition((GalleryControl)sender));
if (res.VisualHit == null)
{
return;
}
GalleryItemControl target = LayoutHelper.FindParentObject <GalleryItemControl>(res.VisualHit);
if (target != null && target.Item != dragableItem)
{
GalleryItemCollection targetCollection = target.Item.Group.Items;
GalleryItemCollection sourceCollection = dragableItem.Group.Items;
int targetIndex = targetCollection.IndexOf(target.Item);
if (targetCollection == sourceCollection)
{
targetCollection.Move(originalIndex, targetIndex);
}
else
{
sourceCollection.Remove(dragableItem);
targetCollection.Insert(targetIndex, dragableItem);
}
dragableItem = null;
}
}
}