private int AddInternal(TreeNode node, int delta)
{
ArgumentNullException.ThrowIfNull(node);
if (node._handle != IntPtr.Zero)
{
throw new ArgumentException(string.Format(SR.OnlyOneControl, node.Text), nameof(node));
}
// Check for ParentingCycle
owner.CheckParentingCycle(node);
// If the TreeView is sorted, index is ignored
TreeView tv = owner.TreeView;
if (tv is not null)
{
foreach (TreeNode treeNode in node.GetSelfAndChildNodes())
{
KeyboardToolTipStateMachine.Instance.Hook(treeNode, tv.KeyboardToolTip);
}
}
if (tv is not null && tv.Sorted)
{
return(owner.AddSorted(node));
}
node.parent = owner;
int fixedIndex = owner.Nodes.FixedIndex;
if (fixedIndex != -1)
{
node.index = fixedIndex + delta;
}
else
{
//if fixedIndex != -1 capacity was ensured by AddRange
Debug.Assert(delta == 0, "delta should be 0");
owner.EnsureCapacity(1);
node.index = owner.childCount;
}
owner.children[node.index] = node;
owner.childCount++;
node.Realize(false);
if (tv is not null && node == tv.selectedNode)
{
tv.SelectedNode = node; // communicate this to the handle
}
if (tv is not null && tv.TreeViewNodeSorter is not null)
{
tv.Sort();
}
return(node.index);
}
public virtual void Insert(int index, TreeNode node)
{
if (node.handle != IntPtr.Zero)
{
throw new ArgumentException(string.Format(SR.OnlyOneControl, node.Text), nameof(node));
}
// Check for ParentingCycle
owner.CheckParentingCycle(node);
// If the TreeView is sorted, index is ignored
TreeView tv = owner.TreeView;
if (tv is not null)
{
foreach (TreeNode treeNode in node.GetSelfAndChildNodes())
{
KeyboardToolTipStateMachine.Instance.Hook(treeNode, tv.KeyboardToolTip);
}
}
if (tv is not null && tv.Sorted)
{
owner.AddSorted(node);
return;
}
if (index < 0)
{
index = 0;
}
if (index > owner.childCount)
{
index = owner.childCount;
}
owner.InsertNodeAt(index, node);
}