buttonAPI.lua

local button={}

local component = require("component")
local colors = require("colors")
local term = require("term")
local mon = component.gpu
local w, h = mon.getResolution()
local Green = 0x00AA00
local Red = 0xAA0000
local Black = 0x000000

function clear()
  mon.setBackground(Black)
  mon.fill(1, 1, w, h, " ")
end

function clearTable()
  button = {}
  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() -- not needed(?)
  setTable("ButtonText", funcName, 5, 25, 4, 8)
end

function fill(text, color, bData)
  mon.setBackground(color)
  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
    term.setCursor(bData["xmin"], j)
    if j == yspot then
      for k = 0, bData["xmax"] - bData["xmin"] - string.len(text) +1 do
         if k == xspot then
            term.write(text)
          else
            term.write(" ")
          end
       end
     else
       for i = bData["xmin"], bData["xmax"] do
         term.write(" ")
       end
     end
  end
  mon.setBackground(Black)
end

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

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

function flash(name,length)
  toggleButton(name)
  screen()
  os.sleep(length)
  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
      end
    end
  end
  return false
end

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

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



--eof