PyQt5 QCalendarWidget 如何用鼠标将其拖放到窗口的任何地方

在这篇文章中，我们将看到如何在主窗口中拖放日历。为了拖动日历，用户必须点击日历的标题栏，然后移动光标来移动日历，为了放置，只需释放光标。

实施步骤：
1.创建一个继承了QCalendarWidget的日历类
2.在日历类中覆盖鼠标按下和释放事件，在事件中更新移动标志
3.创建一个主窗口类
4.创建一个日历对象
5.设置主窗口的鼠标跟踪功能
6.覆盖鼠标移动事件
7.在鼠标移动事件中获取x、y坐标，并根据它来改变日历的位置。

以下是实现的过程

# 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 mouse press event
    def mousePressEvent(self, QMouseEvent):

        # making flag true
        window.move_calendar = True

    # overriding the mouse release event
    def mouseReleaseEvent(self, event):

        # making flag false
        window.move_calendar = False





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()

        # creating amove flag
        self.move_calendar = False

    # method for components
    def UiComponents(self):

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

        # enabling mouse tracking
        self.calendar.setMouseTracking(True)
        self.setMouseTracking(True)

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

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


    # overriding the mouse move event
    def mouseMoveEvent(self, event):

        # getting x, y co-ordinates
        x = event.x()
        y = event.y()

        # checking the flag
        if self.move_calendar:

            # moving the calendar
            self.calendar.move(x, y)


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

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

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