My version of account.username's GUI API

-- GUI API

black = colors.black
white = colors.white
lightBlue = colors.lightBlue
green = colors.green
yellow = colors.yellow
blue = colors.blue
purple = colors.purple
magenta = colors.magenta
lime = colors.lime
orange = colors.orange
red = colors.red
brown = colors.brown
cyan = colors.cyan
pink = colors.pink
grey = colors.gray
gray = colors.gray
lightGray = colors.lightGray
lightGrey = colors.lightGray

-- Buttons

buttonList = {}
Buttons = {}
Buttons.__index = Buttons

function createButton( name, func )
    button = {}
    setmetatable(button,Buttons)
    button.name = name
    button.action = func
    return button
end

function Buttons:toggle( newColor,sec )

    self:draw( self.x,self.y,self.width,newColor,self.tcolor)

    if sec ~= nil then
        sleep(sec)
        self:draw( self.x,self.y,self.width,self.color,self.tcolor )
    end
end


function Buttons:draw( x,y,width,color,tcolor )

    table.insert(buttonList,{self.name,x,y,width,self.action})

    self.x = x
    self.y = y
    self.width = width
    if self.tcolor == nil then
        self.color = color
    end
    self.tcolor = tcolor

    for i = 1,width do
        paintutils.drawLine(x, y + i, x + #self.name + 1, y + i, color)
    end

    term.setCursorPos(x,y + math.ceil(width/2))
    term.setTextColor(tcolor)
    term.setBackgroundColor(color)
    term.write(" "..self.name.." ")
end

function Buttons:trigger()
    buttonList[i][5]()
end

function Buttons:remove()
    for i = 1,#buttonList do
        if self.name == buttonList[i][1] then
            table.remove(buttonList,i)
            return true
        end
    end
end

function detect( x,y,trigger )
    for i = 1,#buttonList do
        if x >= buttonList[i][2] and x <= buttonList[i][2] + #buttonList[i][1] and y >= buttonList[i][3] and y <= buttonList[i][3] + buttonList[i][4] then
            if trigger == true then
                buttonList[i][5]()
            end
            return buttonList[i][1]
        end
    end
end

-- Progress Bars

barList = {}
Bars = {}
Bars.__index = Bars

function createBar( name )
    bar = {}
    setmetatable(bar,Bars)
    bar.name = name
    return bar
end

function Bars:setup( x,y,length,color,pcolor,disp,dispbcolor,tcolor )
    self.x,self.y,self.length,self.color,self.pcolor,self.disp,self.dispbcolor,self.tcolor = x,y,length,color,pcolor,disp,dispbcolor,tcolor
end

function Bars:draw( x,y,length,color,pcolor,disp,dispbcolor,tcolor )

    if self.x == nil and x ~= nil then
        self.x,self.y,self.length,self.color,self.pcolor,self.disp,self.dispbcolor,self.tcolor = x,y,length,color,pcolor,disp,dispbcolor,tcolor
    end

    self.percent = 0
    term.setCursorPos(x,y)
    paintutils.drawLine(x,y,x+ length,y,color)
    term.setCursorPos(x,y)
    if self.percent > 0 then
        paintutils.drawLine(x,y,x + length*(self.percent/100),y,pcolor)
    end


    percentString = tostring(self.percent).."%"
    if disp == true then
        term.setCursorPos(math.max(x + math.ceil(length/2) - math.ceil(#percentString/2),0) + 1,y-1)
        term.setBackgroundColor(dispbcolor)
        term.setTextColor(tcolor)
        write(percentString)
    end
end

function Bars:update( percent )
    self.percent = percent
    term.setCursorPos(self.x,self.y)
    paintutils.drawLine(self.x,self.y,self.x + self.length,self.y,self.color)
    term.setCursorPos(self.x,self.y)
    if self.percent > 0 then
        paintutils.drawLine(self.x,self.y,self.x + self.length*(self.percent/100),self.y,self.pcolor)
    end


    percentString = tostring(self.percent).."%"
    if self.disp == true then
        term.setCursorPos(math.max(self.x + math.ceil(self.length/2) - math.ceil(#percentString/2),0) + 1,self.y-1)
        term.setBackgroundColor(self.dispbcolor)
        term.setTextColor(self.tcolor)
        write(percentString)
    end
end

-- Textboxs

function newTextBox(x,y,length,bcolor,tcolor)
    typed = {}
    alphabet = "abcdefghijklmnopqrstuvwxyz"
    local shift = false

    term.setBackgroundColor(bcolor)
    paintutils.drawLine(x, y, x + length - 1, y, bcolor)
    term.setCursorPos(x, y)
    term.setTextColor(tcolor)
    term.write("_")

    typing = true
    term.setCursorPos(x,y)
    while typing do
        event,key = os.pullEvent()
        if event == "key" then
            if key >= 2 and key <= 10 then
                table.insert(typed,tonumber(key)-1)
            elseif key == "10" then
                table.insert(typed, "0")
            elseif keys.getName(key) == "enter" then
                typing = false
                return string.gsub(table.concat(typed,""),"space"," ")
            elseif keys.getName(key) == "space" then
                table.insert(typed,keys.getName(key))
            elseif keys.getName(key) == "period" then
                table.insert(typed,".")
            elseif keys.getName(key) == "comma" then
                table.insert(typed,",")
            elseif keys.getName(key) == "backspace" then
                table.remove(typed,#typed)
            elseif keys.getName(key) == "leftShift" or keys.getName(key) == "rightShift" then
                if shift == true then shift = false else shift = true end
            else
                key = keys.getName(key)
                if string.find(alphabet,key) ~= nil then
                    if shift == false then
                        table.insert(typed,key)
                    else
                        table.insert(typed, string.char(string.byte(key) - 32))
                    end
                end
            end
            if #typed > length then
                table.remove(typed,#typed)
            else
                cx,cy = term.getCursorPos()
                term.setBackgroundColor(bcolor)
                paintutils.drawLine(x, y, x + length - 1, y, bcolor)
                term.setCursorPos(x,y)
                term.write(string.gsub(table.concat(typed,""),"space"," "))
                if cx < x + length then
                    term.write("_")
                end
            end
        end
    end
end

-- Boxes

Boxs = {}
Boxs.__index = Boxs

function createDialogueBox( title,body,boxType )
    boxes = {}
    setmetatable(boxes,Boxs)
    boxes.title = title
    boxes.body = body
    boxes.boxType = boxType
    return boxes
end

function Boxs:draw( x,y,width,color,bcolor,tcolor )
    self.width = width
    self.x = x
    self.y = y
    local ret = nil

    if self.boxType == "yn" then                                                                      -- YN Box

        if type(self.body) ~= "table" then
            paintutils.drawLine(x, y, x + #self.body + 1, y, bcolor)
            term.setCursorPos(x,y)
            term.setTextColor(tcolor)
            write(self.title)

            self.len = #self.body

            for i = 1,width do
                paintutils.drawLine(x, y + i, x + #self.body, y + i, color)
            end

            term.setCursorPos(x + 1, y + 2)
            term.write(self.body)


            term.setCursorPos(x + 1,y + width)
            term.setTextColor(tcolor)
            term.setBackgroundColor(green)
            write(" Yes ")

            term.setCursorPos(x + len - 4,y + width)
            term.setBackgroundColor(red)
            write(" No ")

            repeat
                event,click,cx,cy = os.pullEvent("mouse_click")

                if cx >= x + 1 and cx <= x + 5 and cy == y + width then
                    ret = true
                elseif cx >= x + len - 5 and cx <= x + len - 1  and cy == y + width then
                    ret = false
                end
            until ret ~= nil

        else

            len = 0
            for i = 1,#self.body do
                if #self.body[i] > len then
                    len = #self.body[i]
                end
            end

            paintutils.drawLine(x, y, x + len + 1, y, bcolor)
            term.setCursorPos(x,y)
            term.setTextColor(tcolor)
            write(self.title)

            for i = 1,width do
                paintutils.drawLine(x, y + i, x + len + 1, y + i, color)
            end

            for i = 1,#self.body do
                term.setCursorPos(x + (len/2 - #self.body[i]/2) + 1, y + i + 1)
                term.write(self.body[i])
            end

            term.setCursorPos(x + 1,y + width)
            term.setTextColor(tcolor)
            term.setBackgroundColor(green)
            write(" Yes ")

            term.setCursorPos(x + len - 4,y + width)
            term.setBackgroundColor(red)
            write(" No ")

            repeat
                event,click,cx,cy = os.pullEvent("mouse_click")

                if cx >= x + 1 and cx <= x + 5 and cy == y + width then
                    ret = true
                elseif cx >= x + len - 5 and cx <= x + len - 1  and cy == y + width then
                    ret = false
                end
            until ret ~= nil


            self.len = len
        end

    elseif self.boxType == "ok" then                                                                  -- Ok Box
        if type(self.body) ~= "table" then

            paintutils.drawLine(x, y, x + #self.body + 1, y, bcolor)
            term.setCursorPos(x,y)
            term.setTextColor(tcolor)
            write(self.title)
            self.len = #self.body

            for i = 1,width do
                paintutils.drawLine(x, y + i, x + #self.body, y + i, color)
            end

            term.setCursorPos(x + 1, y + 2)
            term.write(self.body)

            term.setCursorPos(x + (self.len/2) - 1,y + width)
            term.setTextColor(tcolor)
            term.setBackgroundColor(green)
            write(" Ok ")


            repeat
                event,click,cx,cy = os.pullEvent("mouse_click")

                if cx > x + (self.len/2 - 4) and cx < x + (self.len/2) and cy == y + width then
                    ret = true
                end
            until ret == true

        else

            len = 0
            for i = 1,#self.body do
                if #self.body[i] > len then
                    len = #self.body[i]
                end
            end
            self.len = len

            paintutils.drawLine(x, y, x + len + 1, y, bcolor)
            term.setCursorPos(x,y)
            term.setTextColor(tcolor)
            write(self.title)

            for i = 1,width do
                paintutils.drawLine(x, y + i, x + len + 1, y + i, color)
            end

            for i = 1,#self.body do
                term.setCursorPos(x + (len/2 - #self.body[i]/2) + 1, y + i + 1)
                term.write(self.body[i])
            end

            term.setCursorPos(x + (self.len/2) - 1,y + width)
            term.setTextColor(tcolor)
            term.setBackgroundColor(green)
            write(" Ok ")

            repeat
                event,click,cx,cy = os.pullEvent("mouse_click")

                if cx > x + (len/2 - 4) and cx < x + (len/2) and cy == y + width then
                    ret = true
                end
            until ret == true
        end
    end
    return ret
end

function Boxs:clear( color )
    paintutils.drawLine(self.x, self.y, self.x + self.len + 1, self.y, color)
    for i = 1,self.width do
        paintutils.drawLine(self.x, self.y + i, self.x + self.len + 1, self.y + i, color)
    end
end