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PQt5 – Transparent Background Progress Bar

  • Last Updated : 22 Apr, 2020

In this article we will see how to make background of progress bar transparent i.e only the bar of progress bar will be visible and background will be completely transparent. In order to do this we have change the alpha level i.e transparency level to zero which is minimum which makes the background completely invisible.

Below is how normal progress bar vs transparent background progress bar looks like

To change the alpha level we have to change the CSS style sheet of Progress Bar, below is the style sheet.

QProgressBar
{
background-color : rgba(0, 0, 0, 0);
border : 1px;
}

This style sheet code is used with setStyleSheet method below is the implementation.




# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting background color to window
        self.setStyleSheet("background-color : yellow")
  
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for widgets
    def UiComponents(self):
        # creating progress bar
        bar = QProgressBar(self)
  
        # setting geometry to progress bar
        bar.setGeometry(200, 100, 200, 30)
  
        # setting the value
        bar.setValue(30)
  
        # setting alignment to center
        bar.setAlignment(Qt.AlignCenter)
  
        # setting background to invisible
        bar.setStyleSheet("QProgressBar"
                          "{"
                          "background-color : rgba(0, 0, 0, 0);"
                          "border : 1px"
                          "}")
  
  
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

Output :

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