public void Build(object root)
{
this.root = root;
//create set of selected and checked nodes
var selected = new HashSet <object>();
var check = new HashSet <object>();
foreach (var i in SelectedItemIndexes)
{
selected.Add(nodes[i]);
}
foreach (var i in CheckedItemIndex)
{
check.Add(nodes[i]);
}
//
nodes.Clear();
levels.Clear();
SelectedItemIndexes.Clear();
CheckedItemIndex.Clear();
//build list of expanded nodes
if (ShowRootNode)
{
AddNode(root, 0);
}
else
{
AddNodeChildren(root, 0);
}
//restore indexes of selected and checked nodes
var newExpanded = new HashSet <object>();
hasChildren = new BitArray(nodes.Count);
for (int i = 0; i < nodes.Count; i++)
{
var node = nodes[i];
if (selected.Contains(node))
{
SelectedItemIndexes.Add(i);
}
if (check.Contains(node))
{
CheckedItemIndex.Add(i);
}
if (expandedNodes.Contains(node))
{
newExpanded.Add(node);
}
hasChildren[i] = GetNodeChildren(nodes[i]).Cast <object>().Any();
}
expandedNodes = newExpanded;
ItemCount = nodes.Count;
base.Build();
}
public override bool CheckItem(int itemIndex)
{
if (GetItemChecked(itemIndex))
{
return(true);
}
Invalidate();
if (CanCheckItem(itemIndex))
{
if (NodeCheckStateNeeded == null)//add to CheckedItemIndex only if handler of NodeCheckStateNeeded is not assigned
{
CheckedItemIndex.Add(itemIndex);
}
OnItemChecked(itemIndex);
return(true);
}
return(false);
}