rectoryTree.html">FoldableDirectoryTree</a></span><span class="signature">({<span class="parameter" id="-param-key"><span class="type-annotation"><a href="https://api.flutter.dev/flutter/foundation/Key-class.html">Key</a>?</span> <span class="parameter-name">key</span>, </span><span class="parameter" id="-param-rootPath"><span>required</span> <span class="type-annotation"><a href="https://api.flutter.dev/flutter/dart-core/String-class.html">String</a></span> <span class="parameter-name">rootPath</span>, </s