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PyQt5 QSpinBox – Checking if it is ancestor of given child

  • Last Updated : 28 May, 2020

In this article we will see how we can check if the spin box is ancestor of the given child. If spin box is a parent, (or grandparent and so on to any level), of the given child, and both spin box and child are within the same window then true it is ancestor otherwise it is not.

In order to do this we use isAncestorOf method with the spin box object.

Syntax : spin_box.isAncestorOf(child)

Argument : It takes QWidget object argument

Return : It returns bool



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 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 range to the spin box
        self.spin.setRange(1, 999999)
  
        # setting prefix to spin
        self.spin.setPrefix("PREFIX ")
  
        # setting suffix to spin
        self.spin.setSuffix(" SUFFIX")
  
        # getting child of spin box
        child = self.spin.children()[0]
  
        # creating a label
        label = QLabel(self)
  
        # making the label multi line
        label.setWordWrap(True)
  
        # setting geometry to the label
        label.setGeometry(100, 200, 200, 60)
  
        # checking if spin box is ancestor
        check = self.spin.isAncestorOf(child)
  
        # setting text to the label
        label.setText("Ancestor ?  : " + str(check))
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

Output :

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