withExpandToNode method
Expands all nodes down to Node identified by specified key. It returns a new controller with the nodes expanded. This method expects the user to properly place this call so that the state is updated.
Internally uses TreeViewController.expandToNode.
setState((){
controller = controller.withExpandToNode(key, newNode);
});
Implementation
TreeViewController withExpandToNode(String key) {
List<Node> _data = expandToNode(key);
return TreeViewController(
children: _data,
selectedKey: this.selectedKey,
);
}