Button API

--[[
Used to easily create button terminals with functions. Check https://pastebin.com/iNT0XGqc for an example use

Every time I tried to make this an object things got annoying. Still working on improving this.
--]]

function new(xPos, yPos, length, height, text, action)
  button = {
    xStart = 1,
    yStart = 1,
    xEnd = 1,
    yEnd = 1,
    text = "",
    action = nil
  }

  if not length then
    length = 1
  end
  if not height then
    height = 1
  end

  button.xStart = xPos
  button.yStart = yPos
  button.xEnd = xPos + length - 1
  button.yEnd = yPos + height - 1

  if text then
    button.text = text
  end
  if action then
    button.action = action
  end
  return button
end

function setText(self, text)
  if text then
    self.text = text
  end
  return self
end

function draw(self, colour)
  if colour then
    oldColour = term.getBackgroundColour()
    term.setBackgroundColour(colour)
  end
  paintutils.drawFilledBox(self.xStart,self.yStart,self.xEnd,self.yEnd)
  term.setCursorPos(math.ceil(self.xStart + (self.xEnd-self.xStart)/2 - string.len(self.text)/2),   math.floor(   self.yStart+(self.yEnd-self.yStart)/2))
  print(self.text)
  if colour then
    term.setBackgroundColour(oldColour)
  end
end

function inBounds(self, xPos, yPos)
  return (xPos >= self.xStart and yPos >= self.yStart and xPos <= self.xEnd and yPos <= self.yEnd)
end