public SortViewModel(ICollectionView source, SortData[] columns, IEnumerable<SortDescription> existing = null,
SortData[] requiredColumns = null) {
View = source;
Columns = columns;
_requiredColumns = requiredColumns ?? new SortData[0];
if (existing != null) {
var d = View.DeferRefresh();
SortDescriptions.Clear();
foreach (var c in _requiredColumns)
SortDescriptions.Add(c.ToSortDescription());
var item = existing
.FirstOrDefault(x => Columns.Select(y => y.Value).Contains(x.PropertyName));
if (item != default(SortDescription)) {
SelectedSort = Columns.First(x => x.Value == item.PropertyName);
SelectedSort.SortDirection = item.Direction;
SortDescriptions.Add(item);
}
d.Dispose();
} else {
var item = SortDescriptions.FirstOrDefault(x => Columns.Select(y => y.Value).Contains(x.PropertyName));
if (item != default(SortDescription)) {
SelectedSort = Columns.First(x => x.Value == item.PropertyName);
SelectedSort.SortDirection = item.Direction;
}
}
OldSelectedSort = SelectedSort;
this.WhenAnyValue(x => x.SelectedSort)
.Skip(1)
.Subscribe(x => SortColumn());
this.SetCommand(x => x.SortCommand).Subscribe(x => SortColumn());
this.SetCommand(x => x.ToggleVisibilityCommand).Subscribe(x => ToggleVisibility());
}
public void SetSort(string value) {
UiHelper.TryOnUiThread(() => { SelectedSort = Columns.First(x => x.Value == value); });
}
