def __init__(self, url, background_color, foreground_color):
        QWidget.__init__(self)

        self.setStyleSheet("background-color: transparent;")

        url = os.path.expanduser(url)

        self.file_name_font = QFont()
        self.file_name_font.setPointSize(24)

        self.file_name_label = QLabel()
        self.file_name_label.setText(
            "Your smartphone file will be shared at\n{0}".format(url))
        self.file_name_label.setFont(self.file_name_font)
        self.file_name_label.setAlignment(Qt.AlignCenter)
        self.file_name_label.setStyleSheet(
            "color: {}".format(foreground_color))

        self.qrcode_label = QLabel()

        self.notify_font = QFont()
        self.notify_font.setPointSize(12)
        self.notify_label = QLabel()
        self.notify_label.setText(
            "Scan the QR code above to upload a file from your smartphone.\nMake sure the smartphone is connected to the same WiFi network as this computer."
        )
        self.notify_label.setFont(self.notify_font)
        self.notify_label.setAlignment(Qt.AlignCenter)
        self.notify_label.setStyleSheet("color: {}".format(foreground_color))

        layout = QVBoxLayout(self)
        layout.setContentsMargins(0, 0, 0, 0)
        layout.addStretch()
        layout.addWidget(self.qrcode_label, 0, Qt.AlignCenter)
        layout.addSpacing(20)
        layout.addWidget(self.file_name_label, 0, Qt.AlignCenter)
        layout.addSpacing(40)
        layout.addWidget(self.notify_label, 0, Qt.AlignCenter)
        layout.addStretch()

        self.port = get_free_port()
        self.local_ip = get_local_ip()
        self.address = "http://{0}:{1}".format(self.local_ip, self.port)

        self.qrcode_label.setPixmap(
            qrcode.make(self.address, image_factory=Image).pixmap())

        tmp_db_file = os.path.join(tempfile.gettempdir(), "filebrowser.db")
        self.background_process = subprocess.Popen(
            "filebrowser --noauth -d {0} --address {1} -p {2}".format(
                tmp_db_file, self.local_ip, self.port),
            cwd=url,
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
            shell=True)
    def start_server(self, filename):
        global local_file_path

        local_file_path = filename

        self.port = get_free_port()
        self.local_ip = get_local_ip()
        self.set_address("http://{0}:{1}/{2}".format(self.local_ip, self.port, filename))

        self.sender_thread = threading.Thread(target=self.run_http_server, name='LoopThread')
        self.sender_thread.start()