PyQt5 QCalendarWidget - Setting Border to the Previous Month button for all states

In this article we will see how we can set border to the previous month button of the QCalendarWidget. Previous month button is on the left hand size in the tool buttons, tool buttons are the buttons available at the top i.e buttons to go to left and right page, setting border to QCalendarWidget is not like setting border to the other widgets, calendar is widget which has many child i.e component we can set border to independent component as well. We can set border to the tool buttons with the help of QCalendarWidget QToolButton as class name in the style sheet, but this will set border to all the elements of the tool buttons. In order to do this we will use setStyleSheet method with the QCalendarWidget object, below is the style sheet code

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;
}

Note : We use QToolButton#qt_calendar_prevmonth::hover and QToolButton#qt_calendar_prevmonth::pressed to add border only when mouse hover over them or when they get pressed. There are also !hover and !pressed which are opposite states for the hover and pressed states. Below is the implementation

Python3 1==

# 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())

Output :

PyQt5 QCalendarWidget - Setting Border to the Previous Month button for all states

Explore