PyQt5 QCalendarWidget – 将所有状态的边框设置为上个月按钮

在本文中，我们将看到如何为 QCalendarWidget 的上个月按钮设置边框。上个月按钮在工具按钮的左侧大小，工具按钮是顶部可用的按钮，即转到左右页面的按钮，为 QCalendarWidget 设置边框不像为其他小部件设置边框，日历是小部件它有很多子组件，我们也可以将边框设置为独立组件。

我们可以借助QCalendarWidget QToolButton作为样式表中的类名来设置工具按钮的边框，但这会为工具按钮的所有元素设置边框。

为了做到这一点，我们将使用 QCalendarWidget 对象的setStyleSheet方法，下面是样式表代码

QCalendarWidget QToolButton#qt_calendar_prevmonth
{
border : 4px solid red;
}
QCalendarWidget QToolButton#qt_calendar_prevmonth::hover
{
border : 4px solid green;
}
QCalendarWidget QToolButton#qt_calendar_prevmonth::pressed
{
border : 4px solid blue;
}

注意：我们使用 QToolButton#qt_calendar_prevmonth::hover 和 QToolButton#qt_calendar_prevmonth::pressed 仅在鼠标悬停或按下时添加边框。还有 !hover 和 !pressed ，它们是悬停和按下状态的相反状态。

下面是实现

# 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(350, 240)
  
        # move the calendar
        self.calendar.move(10, 10)
  
        # setting stylesheet
        # adding border to the navigation  bar previous month button
        # adding border when mouse hover over it and when it get pressed
        self.calendar.setStyleSheet("QCalendarWidget QToolButton# qt_calendar_prevmonth"
                                    "{"
                                    "border : 4px solid red;"
                                    "}"
                                    "QCalendarWidget QToolButton# qt_calendar_prevmonth::hover"
                                    "{"
                                    "border : 4px solid green;"
                                    "}"
                                    "QCalendarWidget QToolButton# qt_calendar_prevmonth::pressed"
                                    "{"
                                    "border : 4px solid blue;"
                                    "}"
                                    )
  
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

输出：