private static void OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
var draggeditem = DataGridHelper.GetDraggedItem(sender as DependencyObject);
if (draggeditem == null)
{
return;
}
ExchangeItems(sender, (sender as DataGrid).SelectedItem);
(sender as DataGrid).SelectedItem = draggeditem;
DataGridHelper.SetDraggedItem(sender as DataGrid, null);
}
private static void OnMouseMove(object sender, MouseEventArgs e)
{
var draggeditem = DataGridHelper.GetDraggedItem(sender as DependencyObject);
if (draggeditem == null)
{
return;
}
var row = TryFindFromPoint <DataGridRow>((UIElement)sender, e.GetPosition((sender as DataGrid)));
if (row == null || row.IsEditing)
{
return;
}
ExchangeItems(sender, row.Item);
}
private static void ExchangeItems(object sender, object targetItem)
{
var draggeditem = DataGridHelper.GetDraggedItem(sender as DependencyObject);
if (draggeditem == null)
{
return;
}
if (targetItem != null && !ReferenceEquals(draggeditem, targetItem))
{
var list = (sender as DataGrid).ItemsSource as IList;
var targetIndex = list.IndexOf(targetItem);
list.Remove(draggeditem);
list.Insert(targetIndex, draggeditem);
}
}