from random import randint

import sys

from PyQt5.QtCore import QTimer

from PyQt5.QtWidgets import QWidget, QApplication, QVBoxLayout, QProgressBar

​

StyleSheet = '''

#RedProgressBar {

    text-align: center;

}

#RedProgressBar::chunk {

    background-color: #F44336;

}

#GreenProgressBar {

    min-height: 12px;

    max-height: 12px;

    border-radius: 6px;

}

#GreenProgressBar::chunk {

    border-radius: 6px;

    background-color: #009688;

}

#BlueProgressBar {

    border: 2px solid #2196F3;

    border-radius: 5px;

    background-color: #E0E0E0;

}

#BlueProgressBar::chunk {

    background-color: #2196F3;

    width: 10px; 

    margin: 0.5px;

}

'''

​

​

class ProgressBar(QProgressBar):

​

    def __init__(self, *args, **kwargs):

        super(ProgressBar, self).__init__(*args, **kwargs)

        self.setValue(0)

        if self.minimum() != self.maximum():

            self.timer = QTimer(self, timeout=self.onTimeout)

            self.timer.start(randint(1, 3) * 1000)

​

    def onTimeout(self):

        if self.value() >= 100:

            self.timer.stop()

            self.timer.deleteLater()

            del self.timer

            return

        self.setValue(self.value() + 1)

​

​

class Window(QWidget):

​

    def __init__(self, *args, **kwargs):

        super(Window, self).__init__(*args, **kwargs)

        self.resize(800, 600)

        layout = QVBoxLayout(self)

        layout.addWidget(  

            ProgressBar(self, minimum=0, maximum=100, objectName="RedProgressBar"))

​

        layout.addWidget(  

            ProgressBar(self, minimum=0, maximum=0, objectName="RedProgressBar"))

​

        layout.addWidget(  

            ProgressBar(self, minimum=0, maximum=100, textVisible=False,

                        objectName="GreenProgressBar"))

        layout.addWidget(  

            ProgressBar(self, minimum=0, maximum=0, textVisible=False,

                        objectName="GreenProgressBar"))

​

        layout.addWidget(  

            ProgressBar(self, minimum=0, maximum=100, textVisible=False,

                        objectName="BlueProgressBar"))

        layout.addWidget(  

            ProgressBar(self, minimum=0, maximum=0, textVisible=False,

                        objectName="BlueProgressBar"))

​

​

if __name__ == "__main__":

    app = QApplication(sys.argv)

    app.setStyleSheet(StyleSheet)

    w = Window()

    w.show()

    sys.exit(app.exec_())