PyQt5 QCalendarWidget 获取焦点链中的前一个部件

在这篇文章中，我们将看到如何在QCalendarWidget的焦点链中获得前一个小部件。焦点链是窗口中的小部件/子部件的列表，它们告诉焦点的顺序，焦点链中的第一个项目将首先得到焦点。

为了达到这个目的，我们将使用QCalendarWidget对象的previousInFocusChain方法。

语法： calendar.previousInFocusChain()

参数： 它不需要参数

返回： 它返回QWidget对象

下面是实现方法

# 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)



class Window(QMainWindow):

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

        # setting title
        self.setWindowTitle("Python ")

        # setting geometry
        self.setGeometry(100, 100, 500, 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 cursor
        self.calendar.setCursor(Qt.PointingHandCursor)

        # setting size of the calendar
        self.calendar.resize(300, 240)

        # move the calendar
        self.calendar.move(10, 10)

        # creating a label
        label = QLabel(self)

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

        # making label multi line
        label.setWordWrap(True)

        # getting the previous widget in focus change
        value = self.calendar.previousInFocusChain()

        # setting text to the label
        label.setText("Previous  Widget in Focus Chain : " + str(value))


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

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

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

输出：