public void RemoveNode(TreeNode TN)
{
ClearChildren(TN);
if (items.Contains(TN))
{
this.items.Remove(TN);
}
}
public void AddRootItem(TreeNode TN)
{
TN.Level = 0;
TN.PropertyChanged +=new PropertyChangedEventHandler(TN_PropertyChanged);
this.items.Add(TN);
if (TN.IsExpanded)
{
PopulateChildren(TN);
}
}
public void UpdateChildren(TreeNode TN)
{
TN.UpdateChildren();
if (TN.HasChildren == false)
{
TN.IsExpanded = false;
}
else if (TN.IsExpanded)
{
if (items.Contains(TN))
{
ClearChildren(TN);
PopulateChildren(TN);
}
}
}
private void ClearChildren(TreeNode TN)
{
if (items.Contains(TN))
{
int indexToRemove = this.items.IndexOf(TN) + 1;
while ((indexToRemove < this.items.Count) && (this.items[indexToRemove].Level > TN.Level))
{
items[indexToRemove].PropertyChanged -= new PropertyChangedEventHandler(TN_PropertyChanged);
items.RemoveAt(indexToRemove);
}
}
}
public NodeExpandedChanagedEventArgs(TreeNode tN)
{
_tN = tN;
}
private void PopulateChildren(TreeNode TN)
{
if (items.Contains(TN))
{
int index = this.items.IndexOf(TN);
if (index == this.items.Count - 1 || this.items[index + 1].Level <= TN.Level)
{
IEnumerable myList = TN.Children;
int offset = 0;
foreach (TreeNode TN2 in myList)
{
TN2.PropertyChanged += new PropertyChangedEventHandler(TN_PropertyChanged);
TN2.Level = TN.Level + 1;
this.items.Insert(index + offset + 1, TN2);
offset++;
}
foreach (TreeNode TN2 in myList)
{
if ((TN2.IsExpanded) && (TN.HasChildren))
{
PopulateChildren(TN2);
}
}
}
}
}