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 SelectedItemIndex)
{
selected.Add(nodes[i]);
}
foreach (var i in CheckedItemIndex)
{
check.Add(nodes[i]);
}
//
nodes.Clear();
levels.Clear();
SelectedItemIndex.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))
{
SelectedItemIndex.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 FastList()
{
if (LicenseManager.UsageMode == LicenseUsageMode.Designtime)
{
ItemCount = 100;
ItemTextNeeded += (o, a) => a.Result = "Item " + a.ItemIndex;
SelectedItemIndex.Add(0);
}
}
public FastTree()
{
AutoCollapse = true;
ShowRootNode = false;
ShowExpandBoxes = true;
ItemIndentDefault = 16;
if (LicenseManager.UsageMode == LicenseUsageMode.Designtime)
{
Build(new object[] { "Node 1", "Node 2", "Node 3" });
SelectedItemIndex.Add(0);
}
}