protected override async Task OnParametersSetAsync()
{
if (GetKey == null)
{
throw new Exception("Must have GetKey.");
}
if (Selection != null)
{
Selection.SelectionMode = this.SelectionMode;
Selection.GetKey = item => GetKey(item);
}
if (SubGroupSelector != null)
{
if (ItemsSource != null && !ItemsSource.Equals(_itemsSource))
{
if (Selection != null)
{
Selection.SetItems(FlattenList(ItemsSource, SubGroupSelector), false);
}
_itemsSource = ItemsSource;
if (_itemsSource != null)
{
dataItems = new ObservableCollection <IGroupedListItem3 <TItem> >();
int cummulativeCount = 0;
for (var i = 0; i < _itemsSource.Count; i++)
{
var group = new HeaderItem3 <TItem, TKey>(_itemsSource[i], 0, cummulativeCount, SubGroupSelector, GroupTitleSelector);
dataItems.Add(group);
var subItemCount = BFUGroupedList <TItem, TKey> .GetPlainItemsCount(_itemsSource[i], SubGroupSelector);
cummulativeCount += subItemCount;
}
}
}
}
await base.OnParametersSetAsync();
}
public static int GetPlainItemsCount(TItem item, Func <TItem, IEnumerable <TItem> > subgroupSelector)
{
var subItems = subgroupSelector(item);
if (subItems == null || subItems.Count() == 0)
{
return(1);
}
else
{
int count = 0;
foreach (var subItem in subItems)
{
var subcount = BFUGroupedList <TItem, TKey> .GetPlainItemsCount(subItem, subgroupSelector);
count += subcount;
}
return(count);
}
}
