beginUpdate
beginUpdate: () => void
endUpdate
endUpdate: () => void
getItemByIdx
getItemByIdx: (index: number) => undefined | Record<string, unknown>
getItems
getItems: () => Record<string, unknown>[]
refresh
refresh: () => void
setItems
setItems: (items: Record<string, unknown>[], idField?: string) => void
updateItem
updateItem: (id: string, item: Record<string, unknown>) => void
DataView の最小インターフェース(Grid 操作用)