how make expansion sidebar

[kwang87]

I want to make sidebar like this:

help me

[GroovinChip]

Check out the example app

[kwang87]

Thanks for the answer!. I checked and created some app. But I want a deeper tree view. can i make it?

and i want dynamic sidemenu from fetch web api. so I deleted the final keywork at disclosureItems.
any problerms?

Please understand my english.

[kwang87]

sidebar( buider: (...) return flutter_fancy_tree_view(); )
its clear