internal protected virtual void SiteNode(TreeGridNode node)
{
//TO_DO: Raise exception if parent node is not the root or is not sited.
int rowIndex = -1;
TreeGridNode currentRow;
node._grid = this;
if (node.Parent != null && node.Parent.IsRoot == false)
{
// row is a child
Debug.Assert(node.Parent != null && node.Parent.IsExpanded == true);
if (node.Index > 0)
{
currentRow = node.Parent.Nodes[node.Index - 1];
}
else
{
currentRow = node.Parent;
}
}
else
{
// row is being added to the root
if (node.Index > 0)
{
currentRow = node.Parent.Nodes[node.Index - 1];
}
else
{
currentRow = null;
}
}
if (currentRow != null)
{
while (currentRow.Level >= node.Level)
{
if (currentRow.RowIndex < base.Rows.Count - 1)
{
currentRow = base.Rows[currentRow.RowIndex + 1] as TreeGridNode;
Debug.Assert(currentRow != null);
}
else
{
// no more rows, site this node at the end.
break;
}
}
if (currentRow == node.Parent)
{
rowIndex = currentRow.RowIndex + 1;
}
else if (currentRow.Level < node.Level)
{
rowIndex = currentRow.RowIndex;
}
else
{
rowIndex = currentRow.RowIndex + 1;
}
}
else
{
rowIndex = 0;
}
Debug.Assert(rowIndex != -1);
this.SiteNode(node, rowIndex);
Debug.Assert(node.IsSited);
if (node.IsExpanded)
{
// add all child rows to display
foreach (TreeGridNode childNode in node.Nodes)
{
//TO_DO: could use the more efficient SiteRow with index.
this.SiteNode(childNode);
}
}
}