PyQt5 QSpinBox – Setting Auto Fill Background property

In this article we will see how we can set the auto fill property of the spin box, this property will cause Qt to fill the background of the spin box before invoking the paint event. The color used is defined by the QPalette.Window color role from the spin box’s palette. By default this property is false. This property should be handled with caution in conjunction with Qt Style Sheets. When a spin box has a style sheet with a valid background or a border-image, this property is automatically disabled. In order to do this we use setAutoFillBackground method.

Syntax : spin_box.setAutoFillBackground(True) Argument : It takes bool argument Return : It returns None

Note :This property cannot be turned off (i.e., set to false) if a spin box’s parent has a static gradient for its background. Below is the implementation 

Python3

# 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 geometry
        self.setGeometry(100, 100, 600, 400)

        # calling method
        self.UiComponents()

        # showing all the widgets
        self.show()

    # method for widgets
    def UiComponents(self):
        # creating spin box
        self.spin = QSpinBox(self)

        # setting geometry to spin box
        self.spin.setGeometry(100, 100, 250, 40)

        # setting prefix to spin
        self.spin.setPrefix("Prefix ")

        # setting suffix to spin
        self.spin.setSuffix(" Suffix")

        # allowing spin box to auto fill background
        self.spin.setAutoFillBackground(True)

        # filling background using palette of spin box
        # and setting its color to the red
        self.spin.setForegroundRole(QPalette.Base)
        p = self.spin.palette()
        p.setColor(self.spin.foregroundRole(), Qt.red)
        self.spin.setPalette(p)


# create pyqt5 app
App = QApplication(sys.argv)

# create the instance of our Window
window = Window()

# start the app
sys.exit(App.exec())

Output :