touchpoint from Lyqyd

local function setupLabel(buttonLen, minY, maxY, name)
    local labelTable = {}
    if type(name) == "table" then
        for i = 1, #name do
            labelTable[i] = name[i]
        end
        name = name.label
    elseif type(name) == "string" then
        local buttonText = string.sub(name, 1, buttonLen - 2)
        if #buttonText < #name then
            buttonText = " "..buttonText.." "
        else
            local labelLine = string.rep(" ", math.floor((buttonLen - #buttonText) / 2))..buttonText
            buttonText = labelLine..string.rep(" ", buttonLen - #labelLine)
        end
        for i = 1, maxY - minY + 1 do
            if maxY == minY or i == math.floor((maxY - minY) / 2) + 1 then
                labelTable[i] = buttonText
            else
                labelTable[i] = string.rep(" ", buttonLen)
            end
        end
    end
    return labelTable, name
end

local Button = {
    draw = function(self)
        local old = term.redirect(self.mon)
        term.setTextColor(colors.white)
        term.setBackgroundColor(colors.black)
        term.clear()
        for name, buttonData in pairs(self.buttonList) do
            if buttonData.active then
                term.setBackgroundColor(buttonData.activeColor)
                term.setTextColor(buttonData.activeText)
            else
                term.setBackgroundColor(buttonData.inactiveColor)
                term.setTextColor(buttonData.inactiveText)
            end
            for i = buttonData.yMin, buttonData.yMax do
                term.setCursorPos(buttonData.xMin, i)
                term.write(buttonData.label[i - buttonData.yMin + 1])
            end
        end
        if old then
            term.redirect(old)
        else
            term.restore()
        end
    end,
    add = function(self, name, func, xMin, yMin, xMax, yMax, inactiveColor, activeColor, inactiveText, activeText)
        local label, name = setupLabel(xMax - xMin + 1, yMin, yMax, name)
        if self.buttonList[name] then error("button already exists", 2) end
        local x, y = self.mon.getSize()
        if xMin < 1 or yMin < 1 or xMax > x or yMax > y then error("button out of bounds", 2) end
        self.buttonList[name] = {
            func = func,
            xMin = xMin,
            yMin = yMin,
            xMax = xMax,
            yMax = yMax,
            active = false,
            inactiveColor = inactiveColor or colors.red,
            activeColor = activeColor or colors.lime,
            inactiveText = inactiveText or colors.white,
            activeText = activeText or colors.white,
            label = label,
        }
        for i = xMin, xMax do
            for j = yMin, yMax do
                if self.clickMap[i][j] ~= nil then
                    --undo changes
                    for k = xMin, xMax do
                        for l = yMin, yMax do
                            if self.clickMap[k][l] == name then
                                self.clickMap[k][l] = nil
                            end
                        end
                    end
                    self.buttonList[name] = nil
                    error("overlapping button", 2)
                end
                self.clickMap[i][j] = name
            end
        end
    end,
    remove = function(self, name)
        if self.buttonList[name] then
            local button = self.buttonList[name]
            for i = button.xMin, button.xMax do
                for j = button.yMin, button.yMax do
                    self.clickMap[i][j] = nil
                end
            end
            self.buttonList[name] = nil
        end
    end,
    run = function(self)
        while true do
            self:draw()
            local event = {self:handleEvents(os.pullEvent(self.side == "term" and "mouse_click" or "monitor_touch"))}
            if event[1] == "button_click" then
                self.buttonList[event[2]].func()
            end
        end
    end,
    handleEvents = function(self, ...)
        local event = {...}
        if #event == 0 then event = {os.pullEvent()} end
        if (self.side == "term" and event[1] == "mouse_click") or (self.side ~= "term" and event[1] == "monitor_touch" and event[2] == self.side) then
            local clicked = self.clickMap[event[3]][event[4]]
            if clicked and self.buttonList[clicked] then
                return "button_click", clicked
            end
        end
        return unpack(event)
    end,
    toggleButton = function(self, name, noDraw)
        self.buttonList[name].active = not self.buttonList[name].active
        if not noDraw then self:draw() end
    end,
    flash = function(self, name, duration)
        self:toggleButton(name)
        sleep(tonumber(duration) or 0.15)
        self:toggleButton(name)
    end,
    rename = function(self, name, newName)
        self.buttonList[name].label, newName = setupLabel(self.buttonList[name].xMax - self.buttonList[name].xMin + 1, self.buttonList[name].yMin, self.buttonList[name].yMax, newName)
        if not self.buttonList[name] then error("no such button", 2) end
        if name ~= newName then
            self.buttonList[newName] = self.buttonList[name]
            self.buttonList[name] = nil
            for i = self.buttonList[newName].xMin, self.buttonList[newName].xMax do
                for j = self.buttonList[newName].yMin, self.buttonList[newName].yMax do
                    self.clickMap[i][j] = newName
                end
            end
        end
        self:draw()
    end,
}

function new(monSide)
    local buttonInstance = {
        side = monSide or "term",
        mon = monSide and peripheral.wrap(monSide) or term.current(),
        buttonList = {},
        clickMap = {},
    }
    local x, y = buttonInstance.mon.getSize()
    for i = 1, x do
        buttonInstance.clickMap[i] = {}
    end
    setmetatable(buttonInstance, {__index = Button})
    return buttonInstance
end