if viewportAPI then os.unloadAPI("viewportAPI") end
os.loadAPI("viewportAPI")
if buttonAPI then os.unloadAPI("buttonAPI") end
os.loadAPI("buttonAPI")
if eventDispatcherAPI then os.unloadAPI("eventDispatcherAPI") end
os.loadAPI("eventDispatcherAPI")

viewport = viewportAPI.new({term = peripheral.wrap("back")})

button = buttonAPI.new({
	text = "test",
	x = 5,
	y = 5,
	height = 1,
	width = 6,
	isSticky = false,
	backgroundColor = colors.green
})

viewport:addElement(button)
viewport:redraw()

function clickHandler(element, posX, posY)
	element.backgroundColor = element.backgroundColor == colors.red and colors.green or colors.red
	return true
end

button.callback = clickHandler

while true do
	event, side, xPos, yPos = os.pullEvent("monitor_touch")
	viewport:handleClick(xPos, yPos)
end