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#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import sys
from time import sleep

from PySide2.QtCore import QObject, Signal, QThread
from PySide2.QtWidgets import (QApplication, QWidget, QLabel,
                               QPushButton, QVBoxLayout)


class Worker(QObject):
    progress = Signal(str)

    def __init__(self):
        QObject.__init__(self)

        self._pause = False
        self.is_running = True
        self.count = 0

    def work(self):
        while self.is_running:
            if not self._pause:
                self.progress.emit(str(self.count))
                self.count += 1
            sleep(0.2)

    def pause(self):
        self._pause = True

    def start(self):
        self._pause = False

    def quit(self):
        self.is_running = False


def main():
    app = QApplication(sys.argv)

    worker_thread = QThread()
    worker = Worker()
    worker_thread.started.connect(worker.work)

    worker.moveToThread(worker_thread)

    def run_worker():
        if button.text() == 'Start':
            worker.start()
            if not worker_thread.isRunning():
                worker_thread.start()
            button.setText("Stop")
        else:
            button.setText("Start")
            worker.pause()

    def stop_worker():
        worker.quit()
        worker_thread.quit()
        worker_thread.wait()

    app.aboutToQuit.connect(stop_worker)

    w = QWidget()
    w.setWindowTitle('Signal Sender')

    layout = QVBoxLayout(w)
    label = QLabel(w)
    button = QPushButton(w)
    button.setText("Start")
    button.clicked.connect(run_worker)

    layout.addWidget(label)
    layout.addWidget(button)

    def update_label(text):
        label.setText(text)

    worker.progress.connect(update_label)

    w.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()