how to close all nodes

[Charming2015]

how to close all nodes?

[nosferatu500]

isOpenByDefault: false

[gregjoeval]

this is what I've done, hope this helps

  const ref = useRef<FixedSizeTree<ITreeWalkerData>>(null);

  const collapseAllNodes = useCallback(async () => {
    await ref.current?.recomputeTree(
      Object.fromEntries(
        // Note: This is for a tree with multiple root nodes
        rootNodes.map(
          (m): RecomputeTreeKeyValuePair => [
            createNodeId(m.key),
            {
              open: false,
              subtreeCallback: (node) => {
                // NOTE: this is permitted by the library and is faster than using setOpen
                node.isOpen = false;
              },
            },
          ]
        )
      )
    );
  }, [rootNodes]);

  return (
    <div>
      <button onClick={collapseAllNodes}>Collapse All</button>
      <FixedSizeTree
        ...
        ref={ref}
      >
        ...
      </FixedSizeTree>
    </div>
  )