private void AtDrop(object sender, DragEventArgs e)
{
//if the data type can be dropped
if (_dataType != null)
{
if (e.Data.GetDataPresent(_dataType))
{
//first find the UIElement that it was dropped over, then we determine if it's
//dropped above or under the UIElement, then insert at the correct index.
var dropContainer = (ItemsControl)sender;
//get the UIElement that was dropped over
var droppedOverItem = UIHelper.GetUIElement(dropContainer, e.GetPosition(dropContainer));
int dropIndex = -1; //the location where the item will be dropped
dropIndex = dropContainer.ItemContainerGenerator.IndexFromContainer(droppedOverItem) + 1;
//find if it was dropped above or below the index item so that we can insert
//the item in the correct place
if (UIHelper.IsPositionAboveElement(droppedOverItem, e.GetPosition(droppedOverItem))) //if above
{
dropIndex = dropIndex - 1; //we insert at the index above it
}
//remove the data from the source
var source = (IDragable)e.Data.GetData(_dataType);
source.Remove(e.Data.GetData(_dataType));
//drop the data
var target = (IDropable)AssociatedObject.DataContext;
target.Drop(e.Data.GetData(_dataType), dropIndex);
}
}
if (_insertAdornerManager != null)
{
_insertAdornerManager.Clear();
}
e.Handled = true;
}
