void UpdateSelection()
{
var rowsToSelect = new HashSet <nuint>();
void DiscoverSelected(ITreeNode node) // todo: remove linear traversal
{
if (node.IsSelected)
{
var rowToSelect = treeView.RowForItem(ToObject(nodeToItem[node]));
Debug.Assert(rowToSelect >= 0);
rowsToSelect.Add((nuint)rowToSelect);
}
if (node.IsExpanded)
{
foreach (var n in node.Children)
{
DiscoverSelected(n);
}
}
}
DiscoverSelected(rootItem.Node);
treeView.SelectRows(NSIndexSet.FromArray(rowsToSelect.ToArray()), byExtendingSelection: false);
}
public static void SelectAndScrollInView <Item>(NSOutlineView treeView, Item[] items,
Func <Item, Item> parentGetter) where Item : NSObject
{
var rows = new List <uint> ();
foreach (var item in items)
{
var rowIdx = treeView.RowForItem(item);
if (rowIdx < 0)
{
var stack = new Stack <Item>();
for (var i = parentGetter(item); i != null; i = parentGetter(i))
{
stack.Push(i);
}
while (stack.Count > 0)
{
treeView.ExpandItem(stack.Pop());
}
rowIdx = treeView.RowForItem(item);
}
if (rowIdx >= 0)
{
rows.Add((uint)rowIdx);
}
}
treeView.SelectRows(
NSIndexSet.FromArray(rows.ToArray()),
byExtendingSelection: false
);
if (rows.Count > 0)
{
treeView.ScrollRowToVisible((nint)rows[0]);
}
}