button api

os.loadAPI('/lib/slot_sig')

function Button(side,x,y,text,cb,bg,fg)
    if fg == nil then
        fg = colors.black
    end
    if bg == nil then
        fg = colors.white
    end
    obj = {
        side=side,
        x=x,
        y=y,
        text=text,
        bgColor=bg,
        fgColor=fg,
        callback=cb
    }

    if(side=='term') then
        obj.device = term
    else
        obj.device = peripheral.wrap(side)
    end

    function obj:draw()
        self.device.setCursorPos(self.x, self.y)
        self.device.setTextColor(self.fgColor)
        self.device.setBackgroundColor(self.bgColor)

        self.device.write(self.text)

        self.device.setTextColor(colors.white)
        self.device.setBackgroundColor(colors.black)
    end

    function obj:setText(nText)
        self.text = nText
        self:draw()
    end
    function obj:setBgColor(color)
        self.bgColor=color
        self:draw()
    end
    function obj:setFgColor(color)
        self.fgColor = color
        self:draw()
    end

    function obj:onTermClick(data)
        --TODO
    end
    function obj:onClick(data)
        if(data[1] == self.side) then
            x = data[2]
            y = data[3]
            if (x >= self.x and y == self.y and x < (self.x + string.len(self.text))) then
                self.callback(data)
            end
        end
    end

    if(device == term) then
        slot_sig.connectSlot('mouse_click', obj.onTermClick, obj)
    else
        slot_sig.connectSlot('monitor_touch', obj.onClick, obj)
    end

    return obj
end