scrollDownItem
fun scrollDownItem(line: MutableProvider<Int>, maxLine: Provider<Int>, on: ItemProvider = DefaultGuiItems.TP_ARROW_DOWN_ON.clientsideProvider, off: ItemProvider = DefaultGuiItems.TP_ARROW_DOWN_OFF.clientsideProvider): Item
A UI item for scroll guis that increments line on left-click. Uses on as item provider if it is possible to scroll down, otherwise uses off.
fun scrollDownItem(line: MutableProvider<Int>, maxLine: Provider<Int>, itemProvider: Provider<ItemProvider>): Item
A UI item for scroll guis that increments line on left-click. Uses itemProvider as item provider.