PyQt5 QCalendarWidget – 检查它是否有焦点

在本文中，我们将了解如何检查 QCalendarWidget 是否具有焦点。焦点基本上是输入焦点，默认情况下它没有焦点，但是当应用程序执行鼠标点击它时，它会获得焦点，但是当鼠标点击其他小部件时，它的焦点会转移。

In order to do this we will use hasFocus method with the QCalendarWidget object.
Syntax : calendar.hasFocus()
Argument : It takes no argument
Return : It return bool

编程需要懂一点英语

实施步骤：
1.创建一个主窗口
2. 创建日历小部件
3.在不同位置创建一个行编辑小部件
4.创建一个标签来显示焦点状态
5. 创建每 200 毫秒调用一次动作的 QTimer 对象
6. 在计时器动作中检查日历焦点
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, 650, 400)
 
        # calling method
        self.UiComponents()
 
        # showing all the widgets
        self.show()
 
    # method for components
    def UiComponents(self):
 
        # creating a QCalendarWidget object
        self.calendar = QCalendarWidget(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)
 
        # checking edit focus
        value = self.calendar.hasFocus()
 
        # setting text to the label
        self.label.setText("Has Focus : " + str(value))
 
        # creating a timer object
        timer = QTimer(self)
        timer.timeout.connect(self.show_time)
        timer.start(200)
 
        # creating a line edit
        line = QLineEdit(self)
 
        # setting geometry tot he line edit
        line.setGeometry(500, 100, 100, 40)
 
    # method called by the timer
    def show_time(self):
 
        # checking focus
        value = str(self.calendar.hasFocus())
 
        # setting text through label
        self.label.setText("Has Focus : " + 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：