private void ApplyColumnSort(GridViewColumnHeader header, GridViewColumn column, ListSortDirection direction)
{
var propertyName = GridViewSortBy.GetSortByKey(column);
if (propertyName == null)
{
return;
}
// So AdornerLayer.GetAdornerLayer can apparently sometimes return null, even though we're calling it from
// the Loaded event. Maybe it's because the Window hasn't yet fully loaded? Don't crash in this case
// anyway: we won't show the little arrow, but that's not the end of the world.
if (this.lastColumnHeader != null && this.lastAdorner != null)
{
AdornerLayer.GetAdornerLayer(this.lastColumnHeader)?.Remove(this.lastAdorner);
}
var adorner = new GridViewSortAdorner(header, direction);
AdornerLayer.GetAdornerLayer(header)?.Add(adorner);
var collectionView = CollectionViewSource.GetDefaultView(this.AssociatedObject.ItemsSource);
collectionView.SortDescriptions.Clear();
collectionView.SortDescriptions.Add(new SortDescription(propertyName, direction));
collectionView.Refresh();
this.lastColumnHeader = header;
this.lastDirection = direction;
this.lastAdorner = adorner;
}
private void PerformInitialSort()
{
var gridView = this.AssociatedObject.View as GridView;
if (gridView == null)
{
return;
}
var initialSortColumn = gridView.Columns.FirstOrDefault(x => GridViewSortBy.GetIsInitiallySorted(x));
if (initialSortColumn == null)
{
return;
}
if (initialSortColumn.Header is GridViewColumnHeader header)
{
this.ApplyColumnSort(header, initialSortColumn, ListSortDirection.Ascending);
}
}