Spawner

local monitor = peripheral.find("monitor")
local rside = "back"

if not monitor then
    printError("No monitor connected")
end

monitor.setTextScale(0.5)
local w, h = monitor.getSize()

local function centerPrint(text, y)
    monitor.setCursorPos((w - #text) / 2 + 1, y)
    monitor.write(text)
end

local atPos = math.floor(h / 2)
local itPos = math.floor(h / 2) + 1

function setActive(active)
    redstone.setOutput(rside, not active)

    monitor.setTextColor(colors.white)
    if active then
        monitor.setBackgroundColor(colors.green)
        monitor.clear()
        centerPrint("Active", atPos)
    else
        monitor.setBackgroundColor(colors.red)
        monitor.clear()
        centerPrint("Inactive", atPos)
    end

    monitor.setTextColor(colors.lightGray)
    centerPrint("Right click", itPos)
    centerPrint("to toggle", itPos + 1)
end

local active = false

setActive(active)
while true do
    local event, side, x, y = os.pullEvent("monitor_touch")

    active = not active
    setActive(active)
end