ButtonApi

    local mon = peripheral.wrap("top")
    mon.setTextScale(1)
    mon.setTextColor(colors.white)
    local button={}
    mon.setBackgroundColor(colors.black)

    function clearTable()
       button = {}
       mon.clear()
    end

    function setTable(name, func, xmin, xmax, ymin, ymax)
       button[name] = {}
       button[name]["func"] = func
       button[name]["active"] = false
       button[name]["xmin"] = xmin
       button[name]["ymin"] = ymin
       button[name]["xmax"] = xmax
       button[name]["ymax"] = ymax
    end

    function funcName()
       print("You clicked buttonText")
    end

    function fillTable()
       setTable("ButtonText", funcName, 5, 25, 4, 8)
    end

    function fill(text, color, bData)
       mon.setBackgroundColor(colors.red)
       local yspot = math.floor((bData["ymin"] + bData["ymax"]) /2)
       local xspot = math.floor((bData["xmax"] - bData["xmin"] - string.len(text)) /2) +1
       for j = bData["ymin"], bData["ymax"] do
          mon.setCursorPos(bData["xmin"], j)
          if j == yspot then
             for k = 0, bData["xmax"] - bData["xmin"] - string.len(text) +1 do
                if k == xspot then
                   mon.write(text)
                else
                   mon.write(" ")
                end
             end
          else
             for i = bData["xmin"], bData["xmax"] do
                mon.write(" ")
             end
          end
       end
       mon.setBackgroundColor(colors.black)
    end

    function screen()
       local currColor
       for name,data in pairs(button) do
          local on = data["active"]
          if on == true then currColor = colors.lime else currColor = colors.red end
          fill(name, currColor, data)
       end
    end

   function backscreen()
	local currColor
	fill(name, currColor, data)
	end

function toggleButton(name)
       button[name]["active"] = not button[name]["active"]
       screen()
    end

    function flash(name)
       toggleButton(name)
       screen()
       sleep(0.15)
       toggleButton(name)
       screen()
    end

    function checkxy(x, y)
       for name, data in pairs(button) do
          if y>=data["ymin"] and  y <= data["ymax"] then
             if x>=data["xmin"] and x<= data["xmax"] then
                data["func"]()
                return true
                --data["active"] = not data["active"]
                --print(name)
             end
          end
       end
       return false
    end

    function heading(text)
       w, h = mon.getSize()
       mon.setCursorPos((w-string.len(text))/2+1, 1)
       mon.write(text)
    end

    function label(w, h, text)
       mon.setCursorPos(w, h)
       mon.write(text)
    end