// Evaluates the given ListView's AttachedProperties.SortInstructions and calls EstablishCodedSortOrder
public static void EstablishInitialSortOrder(this ListView listView, string sortInstructions = null)
{
if (sortInstructions == null)
{
sortInstructions = ListViewGridViewHelper.GetSortInstructions(listView);
}
listView.EstablishCodedSortOrder(sortInstructions, ListSortDirection.Ascending);
}
// expects a sortInstructions string like "↓GroupKey↑Group2↕Item"
// ↓ = sort ascending (fix), ↑ = sort descending (fix), ↕ = column sorting (toggleable)
//
public static ListSortDirection EstablishCodedSortOrder(this ListView listView, string sortInstructions, ListSortDirection?overrideToggleDirection = null)
{
var dataView = CollectionViewSource.GetDefaultView(listView.ItemsSource);
var establishedColumnDirection = ListSortDirection.Ascending;
if (dataView != null && dataView.SortDescriptions != null && sortInstructions != null)
{
dataView.SortDescriptions.Clear();
foreach (Match m in Regex.Matches(sortInstructions, @"([↓↑↕])([^↓↑↕]+)"))
{
var dirCode = m.Groups[1].Value;
var fieldCode = m.Groups[2].Value;
if (dirCode == "↓")
{
dataView.SortDescriptions.Add(new SortDescription(fieldCode, ListSortDirection.Ascending));
}
else if (dirCode == "↑")
{
dataView.SortDescriptions.Add(new SortDescription(fieldCode, ListSortDirection.Descending));
}
else
{
string lastColumnSorted = ListViewGridViewHelper.GetLastColumnSorted(listView);
ListSortDirection?lastSortDirection = ListViewGridViewHelper.GetLastSortDirection(listView);
if (overrideToggleDirection.HasValue)
{
establishedColumnDirection = overrideToggleDirection.Value;
}
else if (lastColumnSorted != null && fieldCode == lastColumnSorted && lastSortDirection.HasValue && lastSortDirection.Value == ListSortDirection.Ascending)
{
establishedColumnDirection = ListSortDirection.Descending;
}
dataView.SortDescriptions.Add(new SortDescription(fieldCode, establishedColumnDirection));
ListViewGridViewHelper.SetLastColumnSorted(listView, fieldCode);
ListViewGridViewHelper.SetLastSortDirection(listView, establishedColumnDirection);
}
}
dataView.Refresh();
}
return(establishedColumnDirection);
}