private void ExpandItem(int section)
{
// Return if current expanded item and item to expand are same.
if (_singleExpandable && ItemExpandedState.Select((state, pos) => new Tuple <int, bool>(pos, state))
.FirstOrDefault(arg => arg.Item2)?.Item1 == section)
{
return;
}
if (_singleExpandable)
{
for (var i = 0; i < ItemExpandedState.Count(); i++)
{
if (ItemExpandedState[i])
{
CollapseItem(i);
}
}
}
ItemExpandedState[section] = true;
if (_listHeaderCells.TryGetValue(section, out var headerCell))
{
headerCell?.OnExpand();
}
var itemsInSection = (int)RowsInSection(TableView, section);
if (itemsInSection <= 0)
{
return;
}
var rowsToAdd = new NSIndexPath[itemsInSection];
for (var i = 0; i < itemsInSection; i++)
{
rowsToAdd[i] = NSIndexPath.FromRowSection(i, section);
}
TableView.InsertRows(rowsToAdd, UITableViewRowAnimation.None);
}
