// not supporting multi select for now protected override bool CanMultiSelect(TreeViewItem item) => false;
protected override IList <TreeViewItem> BuildRows(TreeViewItem root)
{
var items = new List <TreeViewItem>();
for (int i = 0; i < _data.Count; i++)
{
items.Add(new RowData(i, _data[i]));
}
var sortedColumns = multiColumnHeader.state.sortedColumns;
if (sortedColumns.Length > 0)
{
items.Sort((baseA, baseB) => {
var a = baseA as RowData;
var b = baseB as RowData;
if (a == null)
{
return(1);
}
if (b == null)
{
return(-1);
}
// sort based on multiple columns
foreach (var column in sortedColumns)
{
bool ascending = multiColumnHeader.IsSortedAscending(column);
// flip for descending
if (!ascending)
{
var tmp = b;
b = a;
a = tmp;
}
int compareResult = 0;
var aVal = GetColumnValue(a, column) as IComparable;
var bVal = GetColumnValue(b, column) as IComparable;
if (aVal != bVal)
{
if (aVal == null)
{
compareResult = 1;
}
else if (bVal == null)
{
compareResult = -1;
}
else
{
compareResult = aVal.CompareTo(bVal);
}
}
// not equal in this column, then return that
if (compareResult != 0)
{
return(compareResult);
}
}
return(a.id.CompareTo(b.id));
});
}
return(items);
}