The clj-vaadin <https://github.com/hsenid-mobile/clj-vaadin> project is
wonderful, it is very useful for me. It has an example of making a tree with
vaadin with 2 levels. Do you know how I can add a third and fourth level?
(defn level2 [tree n1 n2]
(reduce (fn [tree n2]
(doto tree
(.addItem n2)
(.setParent n2 n1)
(.setChildrenAllowed n2 false)))
tree n2))
(defn level1 [tree [n1 n2]]
(.addItem tree n1)
(if (empty? n2)
(.setChildrenAllowed tree n1 false)
(do
(level2 tree n1 n2)
(.expandItemsRecursively tree n1)))
tree)
(defn nomina-tree []
(let [tree (Tree. "Index book")]
(reduce level1 tree index)))
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