Method _toggle

src/cdk/tree/toggle.ts:37–45

(event: Event)

  // Focus this node with expanding or collapsing it. This ensures that the active node will always
  // be visible when expanding and collapsing.
  _toggle(event: Event): void {
    event.stopPropagation();

    this.recursive
      ? this._tree.toggleDescendants(this._treeNode.data)
      : this._tree.toggle(this._treeNode.data);

    this._tree._keyManager.focusItem(this._treeNode);
  }
}