insertAtIndex method

void insertAtIndex(int index, dynamic parent, NodeData newNode, { bool closeCanInsert = false, })

Inserts a node at position index in parent. The index value must be non-negative and no greater than length.

Implementation

void insertAtIndex(int index, dynamic parent, NodeData newNode,
    {bool closeCanInsert = false}) {
  if (parent == null) {
    assert(index <= data!.length);
    if (!closeCanInsert) {
      data!.insert(index, newNode);
      _insertRootControllerAt(index);
      notifyListeners();
    }
    return;
  }
  assert(index <= parent.children.length);
  if (!closeCanInsert) {
    if (!isExpanded(parent)) {
      return;
    }
  }
  parent.children.insert(index, newNode);
  _insertItemAtIndex(index, parent, isIndex: true);
  notifyListeners();
}