private static ListSortDirection GetSortingDirection(GridViewColumnHeader headerClicked, ListViewSortItem listViewSortItem)
{
if (headerClicked != listViewSortItem.LastColumnHeaderClicked)
{
return(ListSortDirection.Ascending);
}
else
{
return((listViewSortItem.LastSortDirection == ListSortDirection.Ascending) ? ListSortDirection.Descending : ListSortDirection.Ascending);
}
}
public static void GridViewColumnHeaderClickedHandler(object sender, RoutedEventArgs e)
{
ListView view = sender as ListView;
if (view == null)
{
return;
}
ListViewSortItem listViewSortItem = _listViewDefinitions[view.Name];
if (listViewSortItem == null)
{
return;
}
GridViewColumnHeader headerClicked = e.OriginalSource as GridViewColumnHeader;
if (headerClicked == null)
{
return;
}
ListCollectionView collectionView = CollectionViewSource.GetDefaultView(view.ItemsSource) as ListCollectionView;
if (collectionView == null)
{
return;
}
ListSortDirection sortDirection = GetSortingDirection(headerClicked, listViewSortItem);
string header = headerClicked.Tag as string;
if (string.IsNullOrEmpty(header))
{
return;
}
if (listViewSortItem.Comparer != null)
{
view.Cursor = System.Windows.Input.Cursors.Wait;
listViewSortItem.Comparer.SortBy = header;
listViewSortItem.Comparer.SortDirection = sortDirection;
listViewSortItem.Comparer.DirectionDig = ((sortDirection.Equals(ListSortDirection.Ascending)) ? -1 : 1);
try { collectionView.CustomSort = listViewSortItem.Comparer; }
catch { }
view.Items.Refresh();
view.Cursor = System.Windows.Input.Cursors.Arrow;
}
else
{
view.Items.SortDescriptions.Clear();
view.Items.SortDescriptions.Add(new SortDescription(headerClicked.Column.Header.ToString(), sortDirection));
view.Items.Refresh();
}
listViewSortItem.LastColumnHeaderClicked = headerClicked;
listViewSortItem.LastSortDirection = sortDirection;
if ((listViewSortItem.Adorner != null) && (listViewSortItem.LastColumnHeaderClicked != null))
{
AdornerLayer.GetAdornerLayer(listViewSortItem.LastColumnHeaderClicked).Remove(listViewSortItem.Adorner);
}
switch (sortDirection)
{
case ListSortDirection.Ascending:
listViewSortItem.Adorner = new SortAdorner(headerClicked, ListSortDirection.Ascending);
AdornerLayer.GetAdornerLayer(headerClicked).Add(listViewSortItem.Adorner);
break;
case ListSortDirection.Descending:
listViewSortItem.Adorner = new SortAdorner(headerClicked, ListSortDirection.Descending);
AdornerLayer.GetAdornerLayer(headerClicked).Add(listViewSortItem.Adorner);
break;
}
}
