/// <summary>
/// Create a list of AlphaGroup{T} with keys set by a SortedLocaleGrouping.
/// </summary>
/// <param name="items">The items to place in the groups.</param>
/// <param name="getKey">A delegate to get the key from an item.</param>
/// <param name="getSortKey">A delegate to get the key for sorting from an item.</param>
/// <param name="sort">Will sort the data if true.</param>
/// <param name="itemClickCommand">The command to execute on a click.</param>
/// <returns>An items source for a LongListSelector</returns>
public static List <DateListGroupCollection <T> > CreateGroups(IEnumerable <T> items,
GetKeyDelegate getKey,
GetSortKeyDelegate getSortKey,
bool sort = true,
RelayCommand <T>?itemClickCommand = null)
{
ThrowIfNull(items);
var list = new List <DateListGroupCollection <T> >();
foreach (T item in items)
{
string index = getKey(item);
if (list.All(a => a.Key != index))
{
list.Add(new DateListGroupCollection <T>(index, itemClickCommand));
}
if (!string.IsNullOrEmpty(index))
{
list.Find(a => a.Key == index).Add(item);
}
}
if (sort)
{
foreach (DateListGroupCollection <T> group in list)
{
group.Sort((c0, c1) => getSortKey(c1).Date.Day.CompareTo(getSortKey(c0).Date.Day));
}
}
return(list);
}
/// <summary>
/// Create a list of AlphaGroup<T> with keys set by a SortedLocaleGrouping.
/// </summary>
/// <param name="items">The items to place in the groups.</param>
/// <param name="ci">The CultureInfo to group and sort by.</param>
/// <param name="getKey">A delegate to get the key from an item.</param>
/// <param name="getSortKey">A delegate to get the key for sorting from an item.</param>
/// <param name="sort">Will sort the data if true.</param>
/// <returns>An items source for a LongListSelector</returns>
public static List <DateListGroup <T> > CreateGroups(IEnumerable <T> items, CultureInfo ci, GetKeyDelegate getKey,
GetSortKeyDelegate getSortKey, bool sort)
{
var list = new List <DateListGroup <T> >();
foreach (var item in items)
{
var index = getKey(item);
if (list.All(a => a.Key != index))
{
list.Add(new DateListGroup <T>(index));
}
if (!string.IsNullOrEmpty(index))
{
list.Find(a => a.Key == index).Add(item);
}
}
if (sort)
{
foreach (var group in list)
{
group.Sort((c0, c1) => getSortKey(c1).Date.Day.CompareTo(getSortKey(c0).Date.Day));
}
}
return(list);
}
