In this article we will see how we can check if the children region of spin box is NULL or not, children region holds the combined region occupied by the spin box’s children. In order to do this we use childrenRegion method. If we delete all the children of the spin box then this property will return an empty region.
In order to do this we use isNull method.
Syntax : children_region.isNull()
Argument : It takes no 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(0, 999999) # setting prefix to spin self.spin.setPrefix("Prefix ") # setting suffix to spin self.spin.setSuffix(" Suffix") # getting the children region children_region = self.spin.childrenRegion() # creating a label label = QLabel(self) # setting geometry to the label label.setGeometry(100, 200, 200, 30) # checking if children region is null check = children_region.isNull() # setting text to the label label.setText("Children Region is NULL ? " + str(check)) # create pyqt5 app App = QApplication(sys.argv) # create the instance of our Window window = Window() window.spin.setFocus() # start the app sys.exit(App.exec()) |
Output :
