PyQt5 QCalendarWidget 设置离开事件

在这篇文章中，我们将看到我们如何为QCalendarWidget实现离开事件。当鼠标指针离开日历时，一个离开事件会被发送到日历上。这个事件处理程序可以在一个子类中重新实现，以接收在事件参数中传递的日历离开事件。

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 leave event
    def leaveEvent(self, event):

        # setting to the text to the label
        window.label.setText("Leave Event Take place")

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leaveEvent，在事件中设置文本为标签
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

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

    # overriding the leave event
    def leaveEvent(self, event):

        # setting to the text to the label
        window.label.setText("Leave Event Take place")


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)


        # creating label to show the properties
        self.label = QLabel(self)

        # setting geometry to the label
        self.label.setGeometry(100, 280, 250, 60)

        # making label multi line
        self.label.setWordWrap(True)

        # setting text to the label
        self.label.setText("No Event")


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

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

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