private void ListView_PreviewMouseMove(object x)
{
if (x is MouseEventArguments mouseArgs)
{
if (mouseArgs.E.LeftButton == MouseButtonState.Pressed)
{
var mousePos = mouseArgs.E.GetPosition(null);
var diff = _startingPoint - mousePos;
if (Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance)
{
if (mouseArgs.Sender is ListView listView)
{
var listViewItem = TreeHelper.FindAnchestor <ListViewItem>((DependencyObject)mouseArgs.E.OriginalSource);
if (listViewItem != null)
{
var eCigarette = (ECigarette)listView.ItemContainerGenerator.ItemFromContainer(listViewItem);
if (eCigarette != null)
{
_startingIndex = ECigarettes.IndexOf(eCigarette);
DataObject dragData = new DataObject("CustomFormat", eCigarette);
DragDrop.DoDragDrop(listViewItem, dragData, DragDropEffects.Move);
}
}
}
}
}
}
}
private void ListView_DragEnter(object x)
{
Debug.WriteLine("ListView_DragEnter");
if (x is DragEventArguments dragArgs)
{
if (!dragArgs.E.Data.GetDataPresent("CustomFormat") || dragArgs.Sender == dragArgs.E.Source)
{
dragArgs.E.Effects = DragDropEffects.None;
if (dragArgs.Sender is ListView listView)
{
var currentListViewItem = TreeHelper.FindAnchestor <ListViewItem>((DependencyObject)dragArgs.E.OriginalSource);
if (currentListViewItem != null)
{
_currentIndex = ECigarettes.IndexOf(currentListViewItem.Content as ECigarette);
int lengthOfCollection = ECigarettes.Count - 1;
if (_currentIndex > _startingIndex && _currentIndex != 0 && _currentIndex + 1 <= lengthOfCollection)
{
var nextContainer = (ListViewItem)listView.ItemContainerGenerator.ContainerFromIndex(_currentIndex + 1);
_currentListViewItem = nextContainer;
_adorner = new DashedRectangleAdorner(_currentListViewItem);
AdornerLayer.GetAdornerLayer(_currentListViewItem).Add(_adorner);
}
else
{
_currentListViewItem = currentListViewItem;
_adorner = new DashedRectangleAdorner(currentListViewItem);
AdornerLayer.GetAdornerLayer(_currentListViewItem).Add(_adorner);
}
}
}
}
}
}