PyQt5 QCalendarWidget – 销毁的信号

在这篇文章中，我们将看到如何从QCalendarWidget中获得销毁的信号。Destroyed信号会在QCalendarWidget被销毁之前立即发出，在任何QPointer的实例被通知之后，并且不能被阻止。在这个信号发出后，所有对象的子代都会立即被销毁。

为了做到这一点，我们将使用QCalendarWidget对象的destroy方法。

语法： calendar.destroy.connect(lambda: print("Destroyed Signal" ))

参数： 它把方法作为参数

执行的动作： 只要激活的信号被发射出来，它将打印消息

以下是执行情况

# 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())