PyQt5 QCalendarWidget – 被破坏的信号

在本文中，我们将了解如何从 QCalendarWidget 中获取被破坏的信号。 Destroyed 信号在 QCalendarWidget 被销毁之前立即发出，在 QPointer 的任何实例被通知之后，并且不能被阻止。发出此信号后，立即销毁所有对象的子对象。

In order to do this we will use destroyed method with the QCalendarWidget object.
Syntax : calendar.destroyed.connect(lambda: print(“Destroyed Signal”))
Argument : It takes method as argument
Action Performed : It will print the message whenever activated signal get emitted

编程需要懂一点英语

下面是实现

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 components
    def UiComponents(self):
 
        # creating a QCalendarWidget object
        calendar = QCalendarWidget(self)
 
        # setting geometry to the calendar
        calendar.setGeometry(50, 50, 400, 250)
 
        # creating a label
        label = QLabel(self)
 
        # setting geometry to the label
        label.setGeometry(100, 280, 250, 60)
 
        # making label multi line
        label.setWordWrap(True)
 
        # text
        text = "Destroyed Signal Emitted "
 
        # getting the destroyed signal and
        # when receives the signal printing the message
        calendar.destroyed.connect(lambda: label.setText(text))
 
        # creating push button
        push = QPushButton("Destroy ", self)
 
        # adding action to it
        push.clicked.connect(lambda: calendar.deleteLater())
 
 
 
 
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())

输出：