[Computer Craft] .NET attempt 2

--[[
        second attempt at a net like frame work
        by Big SHiny Toys
]]--

local net = {}

function net.newWindow()
    return {}
end

function net.run(tWindo)
    local function inBouwndry(clickX,clickY,boxX,boxY,width,hight)
        return ( clickX >= boxX and clickX < boxX + width and clickY >= boxY and clickY < boxY + hight )
    end
    local function redraw()
        for k,v in pairs(tWindo) do
            v("redraw")
        end
    end
    redraw()
    while true do
        event = {os.pullEvent()}
        if event[1] == "redraw" then
            redraw()
        elseif event[1] == "mouse_click" then
            if event[2] == 1 then -- left click
                for k,v in pairs(tWindo) do
                    if inBouwndry(event[3],event[4],v("box")) then
                        v("call")()
                    end
                end
            end
        end
    end
end

local button_meta = {
    __call = function(tButton,ins)
        if ins == "redraw" then
            term.setBackgroundColor(colors[tButton.bgColor] or tButton.bgColor)
            term.setTextColor(colors[tButton.textColor] or tButton.textColor)
            term.setCursorPos(tButton.posX,tButton.posY)
            term.write(tButton.sText)
        elseif ins == "box" then
            return tButton.posX,tButton.posY,#tButton.sText,1
        elseif ins == "call" then
            return tButton.buttonFunction
        end
    end
}

function net.button(window,label,func,posX,posY,tCol,bCol)
    local tempButton =  {
        posY = posY,
        posX = posX,
        buttonFunction = func,
        sText = label,
        textColor = tCol,
        bgColor = bCol
    }
    setmetatable(tempButton,button_meta)
    table.insert(window,tempButton)
end

local function testA()
    print("test A")
    error()
end

local function testB()
    print("test B")
    error()
end

local win = net.newWindow()
net.button(win,"[button1]",testA,2,2,"lime","green")
net.button(win,"[button2]",testB,2,4,"lime","green")
net.run(win)