public Picker <TPickerItem> Items(IEnumerable <TPickerItem> items)
{
if (items == null)
{
throw new ArgumentNullException(nameof(items));
}
items = items.ToList();
if (!items.Any())
{
throw new ArgumentException(nameof(items));
}
if (PickerItems.Any(pickerItem => items.Any(item => pickerItem.Name.Equals(item.Name))))
{
throw new ArgumentException("Can not add duplicate items");
}
_pickerItems.AddRange(items);
foreach (var item in items)
{
if (item.IsSelected)
{
CreateSelection(item);
}
}
return(this);
}
private void AddGroupedItems(IEnumerable <T> items, ObservableList <IComponent> observableList, bool isGrid)
{
observableList.Clear();
if (items is object)
{
items = items.ToList();
if (items.Any())
{
foreach (var groupedItems in items.GroupBy(item => item.Group).OrderBy(g => g.Key, _groupComparer))
{
var header = new GroupedItemsHeader(groupedItems.Key, _groupedItemHeaderGenerator);
if (isGrid)
{
header.GridColumn(1, -1);
}
observableList.Add(header);
observableList.AddRange(groupedItems.Select(t => t.Render()));
}
}
}
}