collapseAll method

void collapseAll()

关闭所有 node

Implementation

void collapseAll() {
  assert(_isInitialized);
  if (_nodes != null) {
    List<EasyTreeNode<E>> result =
        _nodes!.where((element) => element.level == 0).toList();
    for (EasyTreeNode<E> node in result)
      if (node.expanded) this.collapse(node);
    toggleNodeExpanded(_initialNodes, false);
  }
}