Basalt/docs/objects/Object/onScroll.md

onScroll

onScroll(self, event, direction, x, y)
The computercraft event which triggers this method is mouse_scroll.

Here is a example on how to add a onScroll event to your button:

local basalt = require("basalt")

local main = basalt.createFrame()
local button = main:addButton()
  :setPosition(3,3)
  :setSize(12,3)
  :setText("Click")

function buttonOnScroll(self, direction, x, y)
  basalt.debug("Someone scrolls on me!")
end
button:onScroll(buttonOnScroll)