Lua

--[[
The MIT License (MIT)

Copyright (c) 2013 Lyqyd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
--]]

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 = {}
function Button:draw()
    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
function Button:add(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
function Button:remove(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
function Button:run()
    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
function Button:handleEvents(...)
    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
function Button:toggleButton(name, noDraw)
    self.buttonList[name].active = not self.buttonList[name].active
    if not noDraw then self:draw() end
end
function Button:flash(name, duration)
    self:toggleButton(name)
    sleep(tonumber(duration) or 0.15)
    self:toggleButton(name)
end
    function Button:rename(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