PyQt5 QCalendarWidget 设置更改事件

在这篇文章中，我们将看到我们如何实现QCalendarWidget的变化事件。这个事件处理程序可以被重新实现来处理状态变化。在这个事件中被改变的状态可以通过提供的事件来检索。状态变化可以是布局方向、语言变化等。

下面是日历类的代码

# QCalendarWidget Class
class Calendar(QCalendarWidget):

    # constructor
    def __init__(self, parent=None):
        super(Calendar, self).__init__(parent)

    # overriding the changeEvent method
    def changeEvent(self, event):

        # setting text to the label
        print("Change Event Called")

实施步骤：
1.创建一个继承了QCalendarWidget的日历类
2.在日历类中覆盖changeEvent，并在该事件中打印文本
3.创建一个主窗口类
4.在主窗口中创建一个日历对象
5.为日历设置各种属性
6.改变日历的方向

下面是实现的过程

# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys

# QCalendarWidget Class
class Calendar(QCalendarWidget):

    # constructor
    def __init__(self, parent = None):
        super(Calendar, self).__init__(parent)

    # overriding the changeEvent method
    def changeEvent(self, event):

        # setting text to the label
        print("Change Event Called")


class Window(QMainWindow):

    def __init__(self):
        super().__init__()

        # setting title
        self.setWindowTitle("Python ")

        # setting geometry
        self.setGeometry(100, 100, 650, 400)

        # calling method
        self.UiComponents()

        # showing all the widgets
        self.show()

    # method for components
    def UiComponents(self):

        # creating a QCalendarWidget object
        # as Calendar class inherits QCalendarWidget
        self.calendar = Calendar(self)

        # setting geometry to the calendar
        self.calendar.setGeometry(50, 10, 400, 250)

        # setting cursor
        self.calendar.setCursor(Qt.PointingHandCursor)

        # setting direction right to left
        self.calendar.setLayoutDirection(1)




# create pyqt5 app
App = QApplication(sys.argv)

# create the instance of our Window
window = Window()

# start the app
sys.exit(App.exec())

输出。

Change Event Called