public void RebindGroups()
{
BeginUpdate();
HashSet <object> setGroups = _sourceGroups != null
? new HashSet <object>(_sourceGroups)
: new HashSet <object>();
BetterListViewGroup[] toDelete = Groups.
Where(g => !setGroups.Contains(g.DataObject())).
ToArray();
foreach (BetterListViewGroup group in toDelete)
{
Groups.Remove(group);
}
BetterListViewGroup[] toUpdate = Groups.
Where(g => setGroups.Contains(g.DataObject())).
ToArray();
foreach (BetterListViewGroup group in toUpdate)
{
group.Refresh();
}
IEnumerable <object> toAdd = setGroups.Except(Groups.Select(g => g.DataObject()));
List <BetterListViewGroup> groupsToAdd = new List <BetterListViewGroup>();
foreach (object dataObject in toAdd)
{
TaskListViewSourceGroup source = new TaskListViewSourceGroup(dataObject,
_funcGroupValueMember, _funcGroupDisplayMember);
BetterListViewGroup group = new BetterListViewGroup();
group.BindDataSource(source);
groupsToAdd.Add(group);
}
Groups.AddRange(groupsToAdd);
EndUpdate();
}
public static void Refresh(this BetterListViewGroup group)
{
TaskListViewSourceGroup source = group.DataSource();
group.Header = source?.ToString();
}
public static void BindDataSource(this BetterListViewGroup group, TaskListViewSourceGroup source)
{
group.Tag = source;
group.Refresh();
}