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kotlinlang

class TodoItemListCell : ListCell&lt;TodoItem&gt;() {

    override fun updateItem(item: TodoItem?, empty: Boolean) {
        super.updateItem(item, empty)
        if( empty || item == null) {

            setText(null)
            setGraphic(null)

        } else {

            setText( null )
            setGraphic( readCache(item).root )
         }
    }

    companion object {

        // TODO: clean up deletions from cache after removal from UI
        var cellCache : MutableMap&lt;Int, ItemFragment&gt; = mutableMapOf()

        fun readCache(item : TodoItem) : ItemFragment {

            val id = item.id.get()

            if( !cellCache.containsKey(id) ) {

                val itemFragment = find(ItemFragment::class)  // prototype
                itemFragment.load( item )
                cellCache.put( id, itemFragment )
            }

            return cellCache.get(id)!!
        }
    }
}