PyQt5 QSpinBox - 检查它是否是给定孩子的祖先

在本文中，我们将看到如何检查旋转框是否是给定子元素的祖先。如果旋转框是给定子级的父级（或祖父级等），并且旋转框和子级都在同一个窗口内，那么它是祖先，否则不是。

为了做到这一点，我们使用带有旋转框对象的isAncestorOf方法。

Syntax : spin_box.isAncestorOf(child)

Argument : It takes QWidget object argument

Return : It returns bool

下面是实现

# 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())

输出 ：