Progressbar
---------------

This program creates a PyQt5 widget displaying two progress bars. Each progress bar operates on a separate thread, one updating every 0.1 seconds, and the other every 0.2 seconds.

.. code-block:: python
    :caption: ### scripts/PYQT5/03_thread/04_progressbar/main.py

    # -*- coding: utf-8 -*-

    import sys
    import time
    from PyQt5.QtWidgets import QApplication, QProgressBar, QVBoxLayout, QWidget
    from PyQt5.QtCore import QThread, pyqtSignal

    class Worker(QThread):
        progress = pyqtSignal(int)  # 작업 진행 상황을 나타내는 신호

        def __init__(self, sleep_time=0.1):
            super(Worker, self).__init__()
            self.sleep_time = sleep_time

        def run(self):
            for i in range(101):
                time.sleep(self.sleep_time)
                self.progress.emit(i)

    class MultiProgressBarWidget(QWidget):
        def __init__(self):
            super(MultiProgressBarWidget, self).__init__()

            self.initUI()

        def initUI(self):
            layout = QVBoxLayout()

            self.progressBar1 = QProgressBar(self)
            self.progressBar2 = QProgressBar(self)

            layout.addWidget(self.progressBar1)
            layout.addWidget(self.progressBar2)

            self.setLayout(layout)

            self.worker1 = Worker(0.1)  # 0.1초 간격
            self.worker2 = Worker(0.2)  # 0.5초 간격

            self.worker1.progress.connect(self.progressBar1.setValue)
            self.worker2.progress.connect(self.progressBar2.setValue)

            self.worker1.start()
            self.worker2.start()

    if __name__ == "__main__":
        app = QApplication(sys.argv)
        window = MultiProgressBarWidget()
        window.show()
        sys.exit(app.exec_())

- ``Worker`` Class: This class inherits from ``QThread`` and defines code to be executed in a new thread. The ``run`` method updates progress from 0% to 100%. The update interval is determined by ``sleep_time``, passed in the constructor.

- ``progress`` Signal: Within the ``Worker`` class, as progress updates, this signal is emitted to update the UI.

- ``MultiProgressBarWidget`` Class: The main widget containing the two progress bars. Two ``Worker`` instances are created, linked to each progress bar, and the threads are started.